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20 September 2009, Volume 36 Issue 5 Previous Issue    Next Issue

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Expression of amelogenin in epidermal cells from cervical-loop incisor LIU Xin-yu, WANG Duo, ZHANG Yu-hui, HU Xiao-li Inter J Stomatol. 2009, 36 (5):  503-505.  DOI: 10.3969/j.issn.1673-5749.2009.05.001 Abstract ( 1604 )   HTML ( 6 )   PDF（pc） (264KB) ( 1162 )   Save Objective To isolate and culture and purify epidermal cells from rat cervical-loop, and to observe the expression of amelogenin in epidermal cells. Methods Tissues obtained from lower incisor of postnatal 2-day Wistar rats′cervical-loop were cultured in the Dulbecco minimum essential medium（DMEM）-F12 medium. The cervical-loop epidermal cells grew confluent after purified from fibroblast-like cells by differential digestion. Then the purified cells were immunocytochemical stained with antiamelogenin antibody. Results The primary culture was exhibited positive staining to amelogenin while the control group was negative. Conclusion The epidermal cells isolated from rat cervical-loop epithelium have the potentiality to differentiate into ameloblasts. Related Articles | Metrics

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Extracts of Periplaneta americana inhibiting growth of Porphyromonas gingivalis < HU Shao-peng, LIU Fu-xiang, YANG Hong, LI Ling, PAN Lan-lan, MA Yuan-yuan Inter J Stomatol. 2009, 36 (5):  506-508.  DOI: 10.3969/j.issn.1673-5749.2009.05.002 Abstract ( 2055 )   HTML ( 3 )   PDF（pc） (180KB) ( 1126 )   Save Objective To study the inhibitory effects of the extracts of Periplaneta americana on the growth of Porphyromonas gingivalis in vitro. Methods Porphyromonas gingivalis ATCC33277 was chosen as the experimental bacterium. The extracts of Periplaneta americana was double diluted to different concentrations by two-fold dilution, its effect on Porphyromonas gingivalis was measured by the minimal inhibitory mass concentration（MIMC）, the minimal bactericidal mass concentration（MBMC） and D590 value of different culture medium at different times （0, 4, 8, 12, 24, 48 h）. Results The MIMC and MBMC of the extracts of Periplaneta americana was 2.5 g·L-1 and 5 g·L-1, respectively. The extracts of Periplaneta americana inhibitted multiplication of Porphyromonas gingivalis significantly and the effects became stronger with concentration increasing. Conclusion The antibacterial activity of the extracts of Periplaneta americana on Porphyromonas gingivalis was significant, indicating that the extracts of Periplaneta americana can be used as an agent for prevention of periodontal disease. Related Articles | Metrics

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Comparative study on the binding force among three different prefabricated posts LIU Ping , ZHU Zhi-min , LIAO Yun-mao , TAN Zhi Inter J Stomatol. 2009, 36 (5):  509-511.  DOI: 10.3969/j.issn.1673-5749.2009.05.003 Abstract ( 1516 )   HTML ( 5 )   PDF（pc） (122KB) ( 1388 )   Save Objective To compare the binding force among three different prefabricated posts and four different resin core materials. Methods Three types of posts with four types of cores（Parapost with ParaCore, Clearfill, Durafill and F2000, Tenax Fiber White post with ParaCore, Clearfill, Durafill and F2000, CW ceramic post with Clearfill） were made. The adhesive shearing strength between different posts and cores were measured by a universal testing machine. Results The binding force between parapost and cores was the highest in three posts. The binding force between posts and Paracore or Clearfill cores were higher than that between post and Durafill or F2000 cores. In all these four cores, the binding force between posts and F2000 was the lowest. Conclusion To achieve good clinical performance, mechanical lock is very important to retention of post and cores. In addition, core materials have high intension and good liquidity. Related Articles | Metrics

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Picture archiving and communication system-based digital dental film WANG Hao, QI Sen-rong, MA Lan, LI Wen-cheng Inter J Stomatol. 2009, 36 (5):  512-514.  DOI: 10.3969/j.issn.1673-5749.2009.05.004 Abstract ( 1874 )   HTML ( 5 )   PDF（pc） (110KB) ( 1135 )   Save Objective To investigate how to digitize dental film during the construction of picture archiving and communication system（PACS） for the stomatological hospital. Methods Digitization of dental films was achieved through direct way （digital radiology） or indirect way （computed radiology）. Digitized dental image was archived to the server of PACS. The doctors′ workstation read these image data from the server of PACS. Results The dental picture processing software installed in the doctors′ workstation must support DICOM Query/Retrieve function in order to search and to acquire the dental image from the server of PACS. The different companies′ software were not compatible, so they must be transformed in PACS. However the view software in PACS could not show tooth positions. Conclusion During ordering and setting up PACS, all the devices connected to PACS should be tested in order to work well, otherwise the software would conflict among different systems. Related Articles | Metrics

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The efficacy of psychological behavioral intervention on dental anxiety and socia ZHENG Yan-liang, ZHANG Zuo-ji Inter J Stomatol. 2009, 36 (5):  515-518.  DOI: 10.3969/j.issn.1673-5749.2009.05.005 Abstract ( 1479 )   HTML ( 4 )   PDF（pc） (150KB) ( 900 )   Save Objective To investigate the prevalence of dental fear, dental and social anxiety, also observe the efficacy of psychological behavioral intervention in adult orthodontic patient. Methods 226 adult patients with dentognathic deformity who had the indication of orthodontic treatment with straight wire appliance, were randomly divided into the psychological behavioral intervention group and the control group. The former received psychological behavioral intervention, and the latter received common orthodontic knowledge education. A modified Corah dental anxiety scale（MDAS） was adopted to evaluate the dental anxiety in all patients after the first orthodontic treatment, and the Liebowitz social anxiety scale（LSAS） was adopted to evaluate the social anxiety in all patients after 1 month treatment, 1 year treatment, respectively. Results After the first orthodontic treatment, there were significant difference between two groups in total score of MDAS（10.24±3.67，12.43±3.75）and the prevalence of anxiety（10.5%, 26.8%）. After 1 month orthodontic treatment, there were significant difference between two groups in total score of LSAS（36.71±10.42，58.23±9.74） and the prevalence of social anxiety（21.0%, 33.0%）. After 1 year treatment, there were also significant difference between two groups in total score of LSAS（24.73±10.62, 35.42±12.83）and the prevalence of social anxiety（2.6%, 12.5%）. Conclusion There was higher prevalence of dental and social anxiety in adult orthodontic patient, and the psychological behavioral intervention had good efficacy on it. Related Articles | Metrics

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Observation for clinical effects of glass fiber post and metal post in anterior t SU Ji-cheng Inter J Stomatol. 2009, 36 (5):  519-520.  DOI: 10.3969/j.issn.1673-5749.2009.05.006 Abstract ( 1712 )   HTML ( 4 )   PDF（pc） (79KB) ( 1048 )   Save Objective To observe the clinical effects of glass fiber post and metal post in anterior teeth restoration. Methods Glass fiber posts（group A, 100 teeth） and metal posts（group B, 100 teeth） were used for 200 anterior teeth restoration. After three-year follow-up, they were observed the restoration effect. Results The treatments of 98 teeth were effective and that of 2 teeth were failure in group A. The treatments of 86 teeth were effective and that of 14 teeth were failure in group B. There was statistically significant difference between two groups（P＜0.05）. Conclusion Glass fiber post is better in convenient handling and good colour for anterior teeth restoration compared with metal post. Related Articles | Metrics

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Long term observation after bonding and replantation of vertical fractured poster CAI Yi-da, LI Feng -bo, YU Li -ying, SHENG Qian -bin Inter J Stomatol. 2009, 36 (5):  521-523.  DOI: 10.3969/j.issn.1673-5749.2009.05.007 Abstract ( 1865 )   HTML ( 4 )   PDF（pc） (108KB) ( 1405 )   Save Objective To evaluate the long term effect of vertical fractured posterior teeth treated by bonding and replantation surgery and analyze the influential factors of prognosis. Methods Follow up the treated teeth periodically by the examination of tooth, periodontal tissues, flexible degree, and mastication. Record the clinical examination, history registration, and X-rays, etc. Analyze all the information to evaluate the long term effect and prognosis. Results Among 40 teeth observed, the reserved rate of 3 years was 80% while among 20 teeth observed, the reserved rate of 5 years was 75%. There were 32 treated teeth survived, within which 16 were successful, 11 were functional and 5 were failured after 3 years. And there were 15 treated teeth survived, within which 9 were successful, 3 were functional and 3 were failured after 5 years. Conclusion Time, occlusal force, physical and oral health can influence the prognosis. The treatment effects of 3 years are satisfactory. Bonding and replantation surgery can be used to save teeth which theoretically needed to be extracted, so as to maintain the denture integrity and restore the masticatory function. The treatment effects of 5 years are just fine, which needs further study. Related Articles | Metrics

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The preliminary report on evaluation of interproximal papilla defects of maxillar LIN Ping, YE Ping , TU Hui -juan Inter J Stomatol. 2009, 36 (5):  524-526，530.  DOI: 10.3969/j.issn.1673-5749.2009.05.008 Abstract ( 1664 )   HTML ( 3 )   PDF（pc） (141KB) ( 884 )   Save Objective The“black triangle”caused by loss of interproximal papilla usually lead to aesthetics deficiency. The purpose of this study was to investigate whether age, gender, and the distance from the contact point of the maxillary central incisors to the alveolar crest were correlated with the presence of the interproximal papilla by standardized periapical radiographs. Methods A total of 982 adult patients were received examination. The presence of the interproximal papilla was determined visually. The distance from the contact point to alveolar crest was measured by standardized periapical radiographs. Results When the distance between the contact point of two maxillary central incisors and alveolar crest was 5 mm or less, the probability of“black triangle” appearance were only 2.3%. When the distance ranged from 5-6 mm to 6-7 mm, the rates were up to 43.3% and 57.7%. When the distance exceeded 7 mm, the “black triangle”rate was up to 78.9%. Furthermore, the presence of the“black triangle”was related to the distance from the contact point to alveolar crest and age, but not sex. Conclusion The distance from the contact point to the alveolar crest is highly associated with the presence or absence of the interproximal papilla. Related Articles | Metrics

Orginal Article

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Fatigue strength of root filled by two different techniques: An in vitro study GE Bing, NI Hai -lin, HUANG Juan , WU You-nong Inter J Stomatol. 2009, 36 (5):  527-530.  DOI: 10.3969/j.issn.1673-5749.2009.05.009 Abstract ( 1872 )   HTML ( 6 )   PDF（pc） (150KB) ( 1054 )   Save Objective To measure the fatigue test system designed by ourselves, and evaluate the fatigue strength of root filled by cold lateral condensation and warm vertical condensation. Methods 20 lower premolars were made by access cavity and root canal preparation, and then divided into 2 groups randomly. Group A was cold lateral condensation, and group B was warm vertical condensation. After condensation the teeth were cut down the crown along the cemento-enamel junction. Specimens were subsequently submitted to an axial compression cycle test with 50 N, 2 Hz in fatigue test system, until fractured. The cycle time was recorded. Total values were analysis by t-test. Results The average load frequency of cold lateral condensation was 16 402.00±4 632.57, and warm vertical condensation was 16 500.00±4 558.37. The results from t-test revealed that there was no difference between two groups（t=0.96, P＞0.05）. Conclusion The fatigue test system designed by ourselves could imitate the bite cycle. And it could be concluded that the fatigue resistance between cold lateral condensation and warm vertical condensation had no difference. Related Articles | Metrics

Original Articles

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Effect of difference between thermal and setting expansion rate of the investment LI Xiao -jie, TONG Xu, LI Zhong -jie, MENG Yu -kun Inter J Stomatol. 2009, 36 (5):  531-534.  DOI: 10.3969/j.issn.1673-5749.2009.05.010 Abstract ( 1542 )   HTML ( 4 )   PDF（pc） (198KB) ( 1655 )   Save Objective To investigate the effect of difference between thermal and setting expansion rate of the investments on the deformation of resulted castings. Methods Plate -like wax patterns with pre -marked points were invested in two different gypsum -bonded investments of the same total expansion rate. One was higher in setting expansion rate, while the other was higher in thermal expansion rate. Casting rings were lined with a dry ceramic fiber liner by thickness of 0.7 mm. The difference between the castings and the wax patterns at corresponding points were calculated to represent the dimensional changes of the investments with different thermal and setting expansion rate in the rings at different directions. Results In the scope of this study, the casting expansions of the two investments on the axial direction were larger than the radial direction. The difference between the cast and the wax created by higher thermal expansion rate investment on each direction was statistically significant（P<0.05）, while higher setting expansion rate investment was not statistically significant（P>0.05）. Effects of two investments on the precision of castings were statistically significant（P<0.01）. Conclusion The two gypsum-bonded investments with different thermal and setting expansion rate have effect on the casting precision. The investment with higher setting expansion rate should be applied when invested with liner in the casting rings. Related Articles | Metrics

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Clinical experience of using endoscopic technique on maxillofacial benign tumour< LI Qing-long, LI Yun-xia, LI Jing-dong Inter J Stomatol. 2009, 36 (5):  535-536.  DOI: 10.3969/j.issn.1673-5749.2009.05.011 Abstract ( 1469 )   HTML ( 3 )   PDF（pc） (75KB) ( 1144 )   Save Objective To report the clinical experience of applying endoscopic technique on maxillofacial benign tumour. Methods 23 patients with maxillofacial benign tumour were chosen. They were treated with endoscopic technique whose entrance was all within hairline or behind auricular lobule. The operation effect was observed. Results The operation were all successful. There was no patient showed wound infection, ecchymoma, aerocele and recurrence after operation. 100% patients were satisfied with the operation effect. Conclusion Endoscopic technique can successfully applied on maxillofacial benign tumour. Related Articles | Metrics

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Clinical application of miniscrew implants used as orthodontic anchorage WANG Xiao-rong, CHEN Jianghao, NIU Yi-rui Inter J Stomatol. 2009, 36 (5):  537-539，543.  DOI: 10.3969/j.issn.1673-5749.2009.05.012 Abstract ( 1828 )   HTML ( 3 )   PDF（pc） (302KB) ( 1947 )   Save Objective To evaluate the availability of miniscrew implants used as orthodontic anchorages. Methods Six completed skeletal Class Ⅱ patients were selected to study from thirty patients used miniscrew implants as the anchorages. Six skeletal Class Ⅱ maxillary protrusion patients were treated by extracting two upper first premolars and strong maxillary anchorages. Miniscrew implants were inserted into the buccal interalveolar septum between the maxillary second premolar and the maxillary first molar as a direct anchorage for anterior teeth retraction using 1.47-1.96 N force. Cephalometric radiographs were taken before and after closing the space. The cephalometric tracings were superimposed to determine any movement of the upper first molar and the retraction of anterior teeth. Results For the six patients, 12 miniscrew implants were used. After the treatment, the symptoms of the maxillary prognathism of the six patients were improved greatly. The edge of upper incisors was retracted by 6.06 mm on average, and the first molar was moved mesially by 0.44 mm. The miniscrew implants kept stable during treatment, and the surrounding soft tissue of the implants was healthy. Conclusion Miniscrew implants provide a good and convenient anchorage control in the orthodontic treatment. Related Articles | Metrics

Reviews

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Research progress of biofilm formed by Enterococcus faecalis in reinfectious root LIU Hong-yan, LING Jun-qi Inter J Stomatol. 2009, 36 (5):  540-543.  DOI: 10.3969/j.issn.1673-5749.2009.05.013 Abstract ( 1656 )   HTML ( 4 )   PDF（pc） (154KB) ( 923 )   Save Enterococcus faecalis（E.faecalis） is most frequent isolated from teeth with failed endodontic treatment. Biofilm-formation is one of the most important pathogenic mechanisms in post-treatment teeth. This review discussed recent advances in knowledge about the isolation and identification of E.faecalis and the factors that influence biofilm-formation. Related Articles | Metrics

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Effect of tea polyphenols on human periodontal ligament cell FU Hua, HU Ji-an Inter J Stomatol. 2009, 36 (5):  544-546，553.  DOI: 10.3969/j.issn.1673-5749.2009.05.014 Abstract ( 1615 )   HTML ( 3 )   PDF（pc） (138KB) ( 1182 )   Save Tea polyphenols is a kind of polyphenols extracted from tea, which are major active components in tea pharmacodynamic. It has anti-oxidize, anti-lipid peroxidize, clean free radical, anti-catastrophe, anti-tumor abilities and also plays stronge roles to anti -inflammatation, immunodepr essive inflammatory reaction, and better inhibition peridentitis. Periodontal ligament cell（PDLC） are major cells in periodontium, which can composite collagen and dilivary it to extracellular matrix and emerge collagen fiber which is very important to teeth. This article expressed tea polyphenols roles to PDLC and approach tea polyphenols roles for PDLC coherence and proliferation. Related Articles | Metrics

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Detection of denaturing gradient gel electrophoresis in pathogenic bacteria of pe MENG Qingwei, ZHAO Er-yang Inter J Stomatol. 2009, 36 (5):  547-549.  DOI: 10.3969/j.issn.1673-5749.2009.05.015 Abstract ( 1655 )   HTML ( 4 )   PDF（pc） (103KB) ( 914 )   Save With the further investigation on the periodontitis aetiology, the importance of the subgingival microbiological detection becomes more significant. The normal microflora is the ingredient and an obbliganto physiology system of the host. Oral microecology is a dynamic, oppositely and coherent. The balance of the oral microecology is a guarantee and the symbol of the body′s healthy. Once the balance is broken, dysbacteria will occur. The development of molecular biology technology provides rapid and effective technology and method on the research of oral microbion. Denaturing gradient gel electrophoresis（DGGE） has the advantage of safety, reutilization, rapid and easy operation. It can be said that DGGE is a useful means of analysis on the change of the oral microecology. Related Articles | Metrics

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Effects of specifically targeted antimicrobial peptide against Streptoccous mutan HUO Li-jun, LING Jun-qi Inter J Stomatol. 2009, 36 (5):  550-553.  DOI: 10.3969/j.issn.1673-5749.2009.05.016 Abstract ( 1580 )   HTML ( 3 )   PDF（pc） (136KB) ( 1582 )   Save General specifically or selectively targeted antimicrobial peptides（STAMP） consist of a targeting peptide domain, a killing peptide domain and/or a linker peptide domain. These domains remain functionally independent and selectively kill the target bacterium. This is a review of the research progress in components of STAMP and effects of STAMP against Streptoccous mutans. Related Articles | Metrics

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Plasticity of dental pulp stem cell ZHANG Ying-juan, CHEN Wen-xia Inter J Stomatol. 2009, 36 (5):  554-556.  DOI: 10.3969/j.issn.1673-5749.2009.05.017 Abstract ( 1772 )   HTML ( 4 )   PDF（pc） (110KB) ( 959 )   Save Plasticity is the base for clinical application of dental pulp stem cell. This paper was the review of plasticity, influencing factor, application and prospect of dental pulp stem cell. Related Articles | Metrics

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Application of multilocus sequence typing method on infectious diseases XIE Hui -xu, WANG Ping, LIU Min-chuan Inter J Stomatol. 2009, 36 (5):  557-560.  DOI: 10.3969/j.issn.1673-5749.2009.05.018 Abstract ( 1522 )   HTML ( 5 )   PDF（pc） (132KB) ( 1439 )   Save Multilocus sequence typing（MLST） technique is a rapidly developing analytical method of molecular biology with high resolution, which is based directly on nucleotide sequence. By analyzing the 6 to 7 housekeeping genes about 470 bp, the diversity of infectious strains is compared, and different strains have a unique index sequence type. MLST technique can track and investigate pathogenic microbes distributing condition globally by internet. Because of its wide and potential application values, MLST has been applied in identifying microbes related to infectious diseases. In this paper, the authors gave an outlook of the theory of MLST and its application in typing and identifying some pathogenic microbes. Related Articles | Metrics

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Research progress of matrix metalloprotease-13 YANG Heng, PAN Lun-hong, DING Yi Inter J Stomatol. 2009, 36 (5):  561-563.  DOI: 10.3969/j.issn.1673-5749.2009.05.019 Abstract ( 2026 )   HTML ( 5 )   PDF（pc） (116KB) ( 1950 )   Save Matrix metalloprotease（MMP）-13 is one of the most important proteinases in vivo. It belongs to the collagenases of the MMP hyperfamily. Its main function is to decompose extracellularmatrix, participating in many physiological and pathological processes. Many kinds of cells can express matrix metalloprotease and its expression is adjusted by many factors, such as cell growth factor, hormone, tissue inhibitor of metalloproteas, and so on. Its main operational project is Ⅰ-Ⅲ collagen. And it has key contact with adult chronic periodontitis. Related Articles | Metrics

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Research advance of stem cell for tooth tissue engineering XU Ling, ZHANG Fu-qiang, JIANG Xin-quan Inter J Stomatol. 2009, 36 (5):  564-566，570.  DOI: 10.3969/j.issn.1673-5749.2009.05.020 Abstract ( 1343 )   HTML ( 3 )   PDF（pc） (133KB) ( 1176 )   Save Tooth tissue engineering is based on the principle of tooth development, and introduce the mechanism and technology of tissue engineering into the research on repairing of injured tooth tissues and tooth regeneration. That is to say, isolating and culturing stem cells from adult tooth and lived in optimal environment to established tissue engineering tooth in vivo or in vitro. One of the key points is obtaining stem cells with strong proliferation and differentiation capability. This review focused on the research advances of the stem cells for tooth tissue engineering. Related Articles | Metrics

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Research progress of preparation methods of platelet-rich plasma SUN Jie, ZHANG Jian-ming Inter J Stomatol. 2009, 36 (5):  567-570.  DOI: 10.3969/j.issn.1673-5749.2009.05.021 Abstract ( 1628 )   HTML ( 6 )   PDF（pc） (145KB) ( 3560 )   Save Excepting properties of agglutination, platelet contains lots of growth factors especially wound healing and bone regeneration related, while concentrated platelet-rich plasma（PRP） that is rich in growth factors plays an important role in repair of local tissue damage and bone regeneration. Until now, the application of PRP has been an important surgical technique. But there is no uniform standard about its best preparation method, the most accurate counting of platelet and related experimental studies, so its clinical values still lack convincingness. This paper reviewed the research progress of preparation principle and preparation methods of PRP. Related Articles | Metrics

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Relationship between peroxiredoxin family and head and neck tumors HUANG Cong-fa, ZHANG Wen-feng Inter J Stomatol. 2009, 36 (5):  571-573，579.  DOI: 10.3969/j.issn.1673-5749.2009.05.022 Abstract ( 1404 )   HTML ( 3 )   PDF（pc） (141KB) ( 1604 )   Save The peroxiredoxin family is closely associated with proliferation, differentiation and lymph node metastasis of tumors, and has been paid considerable attention recently. This review summarized the relationship between peroxiredoxin family and head and neck tumors. Related Articles | Metrics

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Research progress of tumor necrosis factor-α and its receptor in bone resorption WANG Jue, MEI Yu-feng Inter J Stomatol. 2009, 36 (5):  574-576.  DOI: 10.3969/j.issn.1673-5749.2009.05.23 Abstract ( 1523 )   HTML ( 4 )   PDF（pc） (118KB) ( 1273 )   Save Tumor necrosis factor（TNF）-α is involved in many physiological and pathologic processes. It has extremely important effect on bone resorption of inflammatory diseases. The biological ability of tumor necrosis factor receptor has evident correlation with pathologica bone remodeling and it has a significant role in bone resorption of inflammatory disease with jaws. This paper discussed the biological characters of TNF-α and its receptors that affect bone remodeling and bone resorption of inflammatory diseases with jaws. Related Articles | Metrics

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Research progress of mucosa-associated lymphoid tissue lymphoma arising in the sa HUANG Wei -jia, PING Fei -yun Inter J Stomatol. 2009, 36 (5):  577-579.  DOI: 10.3969/j.issn.1673-5749.2009.05.024 Abstract ( 1468 )   HTML ( 6 )   PDF（pc） (108KB) ( 656 )   Save Salivary gland mucosa -associated lymphoid tissue lymphoma is associated with autoimmune diseases and chronic infections, such as Sjögren syndrome, chronic autoimmune disease, hepatitis C virus, Epstein -Barr virus, herpesvirus, human T -cell lymphoma virus, human immunodeficiency virus. Chromosome translocation has seldom been observed in this disease, but it relates to definite chemokines, showing a conserved pattern of chromosomal gains, which appear to target genes positively modulating cell survival and proliferation, and has a background of benign lymphoepithelial lesion. It shows a chronic, painless clinical course. A long-term follow-up and repeating biopsy are needed to diagnosis. Radiotherapy and chemo are both responsive, and disseminated disease at multiple sites need therapeutic alliance. It has a good prognosis, although with a higher relapse rate than oher type of mucosa-associated lymphoid tissue lymphoma, and salivary gland swelling, myoepithelial sialadenitis, second-cancer and metastasis may also take place, even involves bone marrow. A long-term and attentive follow-up is important to the prognosis. Related Articles | Metrics

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Effects of irrigations on the bond strength of root canal dentin to adhensive mat MAO Hai -yan, CHEN Ya -ming Inter J Stomatol. 2009, 36 (5):  580-582.  DOI: 10.3969/j.issn.1673-5749.2009.05.025 Abstract ( 1385 )   HTML ( 4 )   PDF（pc） (106KB) ( 870 )   Save Irrigations were routinely used in endodontic treatment, which is the foundation of restoration of endodontically treated teeth using post and adhensive materials. However, some studies have recently shown that irrigations may have some effects on the bond strength of root canal dentin to adhensive materials，and the effects may depend on the adhensive system used. This article will review about it. Related Articles | Metrics

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Management of peri-implant soft tissues LUO Zhi-bin, ZENG Rong-sheng, CHEN Zhuo-fan Inter J Stomatol. 2009, 36 (5):  583-585，589.  DOI: 10.3969/j.issn.1673-5749.2009.05.026 Abstract ( 1758 )   HTML ( 8 )   PDF（pc） (131KB) ( 1814 )   Save The osseointegration and aesthetic effect of implant could be affected by“the cuff”of peri-implant tissues, width of attached gingival, the labial contour and the condition of gingival papilla. Free gingival graft, pedicle gingival graft, autologous cultural mucosal graft, allograft dermal matrix and forced orthodontic eruption can expand the attached gingival of peri-implant tissues. The aesthetic zone always has sufficient attached gingival, but its whole aesthetic effect may be affected by the morphology of the soft tissue and height of the gingival papilla. The aesthetics of implant-supported prothetics can be implemented by incisive design of soft tissue, guided custom temporary crown or papilla regeneration technique and flapless implant technique in aesthetic area. Related Articles | Metrics

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Application of functional magnetic resonance imaging in stomatology ZHAO Fang, LIU Dong-xu Inter J Stomatol. 2009, 36 (5):  586-589.  DOI: 10.3969/j.issn.1673-5749.2009.05.027 Abstract ( 1600 )   HTML ( 2 )   PDF（pc） (131KB) ( 655 )   Save The main principle of the functional magnetic resonance imaging（fMRI） is that with the activity of neurons the regional oxygen consumption can not match with cerebral blood flow which results in the change of regional magnetic field. It is an imaging method of function brain area by stimulate in magnetic resonance facility, and it can exactitude reflect the nerve activity level of brain and confirm the function brain area in alive body, and it is a new impersonality imagine method to evaluate the cognitive function of human. With a rapid and great development of the normal magnetic resonance imaging（MRI） technique during these years, the functional magnetic resonance imaging has been a new imaging technique which has been widely applied in the fundament field of research and clinical research of the Neuroscience. Especially, the investigation of blood oxygen level dependent functional magnetic resonance imaging（BOLDfMRI） in neurology and psychiatry developed quickly. With the fMRI the neuron can be comparatively precise located non-woundedly and repeatedly, besides higher space and time resolution, no radiation and better repeatability are also its advantages. The application of functional magnetic resonance imaging in stomatology are mainly in the study of the oral cavity function, such as masticatory function, swallowing function, speech, sensation, the sensation of oromaxillo-facial region like trigeminal neuralgia and susceptibility artifact. In this article, we summarized the principle, application and perspective of functional magnetic resonance imaging in stomatology. Related Articles | Metrics

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Research progress of composite tissue allotransplantation WANG Tie -sheng, LIN Li -song Inter J Stomatol. 2009, 36 (5):  590-593.  DOI: 10.3969/j.issn.1673-5749.2009.05.028 Abstract ( 1410 )   HTML ( 2 )   PDF（pc） (127KB) ( 1206 )   Save It is always a challenge for clinical medical workers to reconstruct the serious defect of the peripheral tissue. Clinically, autologous tissue transplantation remains the most reliable means for the serious defect of the eripheral tissue. However, the loss of organizational function of the offer′s district and some tissues unable to rovide by selves is insurmountable disadvantage. Composite tissue allotransplantation shows great potential and attractive for the serious defect of the peripheral tissue. This article gave a review to the animal experiments, clinical applications and immune suppression of composite tissue allotransplantation in the limbs, joints, larynx and facial transplantation. Related Articles | Metrics

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Research progress of adhesives for maxillofacial prostheses WEI Yu, LI Yan Inter J Stomatol. 2009, 36 (5):  594-596.  DOI: 10.3969/j.issn.1673-5749.2009.05.029 Abstract ( 1344 )   HTML ( 3 )   PDF（pc） (100KB) ( 889 )   Save Adhesive retention is one of the most important methods which used to retain the maxillofacial prostheses. The adhesive and biological properties are two major properties that maxillofacial prostheses have. This paper reviewed the progress on the study on the two major properties of maxillofacial adhesives. Considering that there is extensive application of maxillofacial prostheses adhesives in clinic, there should be further studies on the appraisal experiment standardization and the improvement of the properties. Related Articles | Metrics

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Research progress of lateral occlusion YANG Rui, LIN Xue-feng Inter J Stomatol. 2009, 36 (5):  597-599，603.  DOI: 10.3969/j.issn.1673-5749.2009.05.030 Abstract ( 1507 )   HTML ( 2 )   PDF（pc） (133KB) ( 1019 )   Save Lateral occlusion is the contact relationship between upper and lower teeth in laterotrusive movement, which is very important to masticatory function. This article reviewed the new progress of researches on characteristics of lateral occlusal contacts, the effects of lateral occlusion on masticatory muscles, temporomandibular joint and condyle movement and occlusion-related diseases. Related Articles | Metrics

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In vitro studies on retentive ability of fiber posts: A methodology review CHENG Shao-hua, ZHAO Ke Inter J Stomatol. 2009, 36 (5):  600-603.  DOI: 10.3969/j.issn.1673-5749.2009.05.031 Abstract ( 1600 )   HTML ( 2 )   PDF（pc） (137KB) ( 1401 )   Save Studies on retentive ability of fiber posts are benefited to improve the success rate of restorations. Because of the variety of influencing factor, the studies on retentive ability of fiber posts are mainly by in vitro experiments. The methodology includes bonding strength tests, fractographic analysis and detection of degree of conversion. Each method has its own features, according to the different purpose, theory or condition. This paper reviewed the methodology for in vitro studies on retentive ability of adhesive fiber posts. Related Articles | Metrics

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Application of three-dimensional finite element method in root canal therapy LIU Zhi-yong, XIONG Shi-jiang Inter J Stomatol. 2009, 36 (5):  604-606.  DOI: 10.3969/j.issn.1673-5749.2009.05.032 Abstract ( 1579 )   HTML ( 3 )   PDF（pc） (101KB) ( 1520 )   Save The three-dimensional finite element method is one of the most important methods in the study of oral biomechanics. It is important to adopt three-dimensional finite element method to simulate and analyse stress distribution of the tooth and filling material in endodontics. Many scholars research different of influencing factors of stress analysis in root canal preparation and root canal filling. This review was represented on the application and research progress of three-dimensional finite element method in root canal therapy in recent years. Related Articles | Metrics

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Research progress on Mtwo Ni-Ti instrument ZHANG Jian, GE Jiu-yu, SUN Wei-bin Inter J Stomatol. 2009, 36 (5):  607-609.  DOI: 10.3969/j.issn.1673-5749.2009.05.033 Abstract ( 1673 )   HTML ( 7 )   PDF（pc） (108KB) ( 1684 )   Save The introduction of Ni-Ti rotary instruments has led to great improvements in the effectiveness and the speed of root canal instrumentation even in curved roots. In order to achieve the mechanical goal of instrumentation that requires a uniformly tapered funnel preparation, several Ni-Ti systems can be used. A crown-down instrumentation sequence has been recommended for most of these rotary Ni-Ti instruments. Recently, the new Mtwo instruments design has been introduced which no longer requires a crown-down instrumentation sequence. Mtwo Ni-Ti system is a new type of Ni-Ti instruments. Mtwo instruments has its own autospecific predominance compared with the other Ni-Ti instruments system. Mtwo system has different design and utilization method. A review of Mtwo Ni-Ti instruments system was presented in this paper. Related Articles | Metrics

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Research advances in all-ceramic abutment for dental implants WANG Min, XIA Hai-bin Inter J Stomatol. 2009, 36 (5):  610-612.  DOI: 10.3969/j.issn.1673-5749.2009.05.034 Abstract ( 1511 )   HTML ( 2 )   PDF（pc） (108KB) ( 1203 )   Save Recently, with the improvement of living standard and the development of dental implantology, both clinicians and patients have more and more requests on esthetic restorations. Owing to the exposure of metal color, the traditional titanium abutments have poor esthetic outcomes in those patients whose gingiva is thin or the shoulder of implants are shallow. However, due to the excellent esthetic properties, all-ceramic abutments are becoming more and more popular with clinicians and patients. We summarized the varieties and fabrication methods, advantages, mechanical properties and applications of all-ceramic abutments in dental implantology. All-ceramic abutments haven′t been a conventional choice of implantology because of the price and mechanical strength, but their application will become more and more broad with the progress of material and technology. Related Articles | Metrics

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Research progress of oral instrumental color matching technology CHEN Yuan -hua, CAI Yu -hui Inter J Stomatol. 2009, 36 (5):  613-615.  DOI: 10.3969/j.issn.1673-5749.2009.05.035 Abstract ( 1311 )   HTML ( 3 )   PDF（pc） (106KB) ( 1562 )   Save Matching the color of mature dentition may be one of the difficult challenges which dentist faces in practice. Visual color matching is difficult to reproduce and is highly subjective due to variables that affect shade matching including light condition, background, age, sex, and experience, et al. The common color matching devices are colorimeters, spectrophotometers, red green blue（RGB） system or combination above which have different principles. Instrumental color matching technology has been applied to help dentist create lifelike restorations, since they are not influenced by significant parameters in visual selection. But these devices also have shortages. In this article, the development and current situation of instrumental color matching technology are reviewed. Related Articles | Metrics

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Research progress of lingual self-ligating bracket orthodontic treatment YE Liang, ZHU Shuang-lin Inter J Stomatol. 2009, 36 (5):  616-618.  DOI: 10.3969/j.issn.1673-5749.2009.05.036 Abstract ( 1535 )   HTML ( 5 )   PDF（pc） (106KB) ( 745 )   Save Lingual self-ligating bracket orthodontic treatment is a novel kind of treatment of orthodontics, which adopts self-ligating brackets in the lingual orthodontics. This kind of orthodontic treatment not only has the advantage of self-ligating brackets which includes reduced friction, short treatment time and chairside time, but also has the esthetic property of lingual orthodontics, making itself with unique character compared with other ones. Therefore lingual self-ligating bracket orthodontic treatment is an advanced technique and will play an important role in the future orthodontics field. The paper was reviewed the research progress of this orthodontic treatment. Related Articles | Metrics

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Influence of orthodontic treatment on craniofacial shape of the patients with ske WANG Qing-zhu, CHEN Wen-jing Inter J Stomatol. 2009, 36 (5):  619-622.  DOI: 10.3969/j.issn.1673-5749.2009.05.037 Abstract ( 1864 )   HTML ( 2 )   PDF（pc） (129KB) ( 1012 )   Save Skeletal class Ⅲ malocclusion is a formidable problem for orthodontists and there are disputes about the treatment for a long time. There are many methods in treating this kind of malocclusion whose treating juncture is flexible and the results are not always the same. The reason is the multiformity of etiological factor of skeletal class Ⅲ malocclusion and the feature of patient′s growth and development. Nevertheless, different methods make different influence on the patients. This article reviewed the current state of knowledge as regards the influence of several kinds of orthodontic methods on craniofacial shape of skeletal class Ⅲ patients. Related Articles | Metrics

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Adaptable rebuilding of the temporomandibular joint after orthodontic treatment w MAI Li -xiang , ZHANG Zhi -guang , WANG Da -wei Inter J Stomatol. 2009, 36 (5):  623-625.  DOI: 10.3969/j.issn.1673-5749.2009.05.038 Abstract ( 1607 )   HTML ( 4 )   PDF（pc） (110KB) ( 1328 )   Save To stimulate condylar growth by twin-block is an appropriate way to treat Angle class Ⅱ malocclusion associated with mandibular skeletal retrusion. The adaptation of condylar cartilage to mandibular forward positioning constitutes the fundamental rationale for orthodontic functional therapy, which partially contributes to the correction of jaw discrepancies by achieving mandibular growth modification. However, functional appliance therapy delivers more stable results when used at or after the peak of pubertal period while its effect is more equivocal and controversial on adult patients. In this article, the treatment principle of twin-block appliance, adaptable rebuilding in condylar process and glenoid fossa of the temporomandibular joint were reviewed, which help orthodontists to comprehend the mechanism of adaptable rebuilding of the temporomandibular joint induced by functional appliance. This review also provides a basic theory, treatment opportunity and indication to recognize, diagnose, and treat patients with mandibular retrusion of Angle class Ⅱ malocclusion. Related Articles | Metrics