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20 July 2010, Volume 37 Issue 4 Previous Issue    Next Issue

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Clinical application and progress of fixed-removable prostheses DU Li. Inter J Stomatol. 2010, 37 (4):  373-378.  DOI: 10.3969/j.issn.1673-5749.2010.04.001 Abstract ( 1305 )   HTML ( 8 )   PDF（pc） (440KB) ( 1553 )   Save With the rapid development of oral techniques and materials, clinical treatment has been developed gradually from single removable prostheses or fixed prostheses to fixed-removable prostheses, according to the special cases during clinical treatment. The kind of therapy has a good effect on complicated tooth defect or dentition defect, especially on distal extension defect. This is a kind of prostheses which could restore aesthetical and comfortable need of the patient. Therefore, it would have a good application prospect in the future. In our article,we mainly summarized the types and application issues of fixed-removable prostheses from the clinical aspects,and lay the foundation for clinical practice. Related Articles | Metrics

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Reconstruction of the three dimensional model of left supramaxillary first molars of wild giant panda LIU Shuang -yun1, CHEN Yong -jin1, DONG Yan2, WU Guo -feng2, LIU Xin -yu3. Inter J Stomatol. 2010, 37 (4):  379-381.  Abstract ( 1143 )   HTML ( 6 )   PDF（pc） (202KB) ( 959 )   Save Objective To explore an easier and more precise method for three dimensional finite element model reconstruction about wild giant panda tooth in Qinling mountain with CT scanning images. Methods A three dimensional finite element model of left supramaxillary first molar was constructed by CT scanning images and using Mimics generated image processing and editing software． Results The three dimensional finite element model of left supramaxillary first molar was successfully constructed on compute． Conclusion The established model of the giant panda tooth is relatively complete and precise． It can facilitate the further dental research． Related Articles | Metrics

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Investigation of epidemic fluorosis and the current prosthodontical therapy status in coal-burning pollution area of Zhenxiong and Weixin JI Juan-juan1, FAN Qun1, XIAO Yi-ze2, HU Shou-jing3, WANG Bing1, ZHE Li-ping1. Inter J Stomatol. 2010, 37 (4):  382-385.  DOI: 10.3969/j.issn.1673-5749.2010.04.003 Abstract ( 1146 )   HTML ( 4 )   PDF（pc） (146KB) ( 816 )   Save Objective To study the prevalence of fluorosis and the current prosthodontical therapy status, to find out relationship between them in high fluoride areas of Zhenxiong and Weixin. Methods Use stratified random sampling method. The dental fluorosis prevalence index and current prosthodontical therapy status were studied in people aged 35-44 in the high fluoride areas of Zhenxiong and Weixin. Results The incidence of the fluorosis was 100%. The total community fluorosis index was 3.49 which indicated the area was serious coal-polluted fluorosis area. There was no significant difference between urban and rural, male and female. Concerned the current prosthodontical therapy status, there was significant difference between urban and rural. It was also related to the degrees of the fluorosis, but no significant difference between male and female. Restoration pass rate was only 7.7%. 93.3% people urged to get the prosthodontical therapy, but most of them only could afford about ￥300 yuan for the therapy. Conclusion According to the serious prevalence of fluorosis and poor economic condition, we advised that the resin venner restorations are the fitable methed to improve the health and the cosmetology of the teeth in that area. Related Articles | Metrics

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Relationship between human herpes virus -5 to 8 and oral lichen planus  GU Yang1, LI Jing -quan2, LI Ming - han1, GONG Liang -wen1, XU Hao2, ZHANG Hong1, LI Wen -yan1, CHEN Zheng -han2. Inter J Stomatol. 2010, 37 (4):  386-391.  DOI: 10.3969/j.issn.1673-5749.2010.04.004 Abstract ( 1475 )   HTML ( 3 )   PDF（pc） (226KB) ( 1051 )   Save Objective The aim of this study is to survey the potential relationship between oral lichen planus （OLP） and human herpesvirus（HHV）-5 to 8. Methods Seriously selected 36 OLP patients and 43 healthy controls, and meanwhile we collected their 6 kinds of samples including white blood cell（WBC）, serum, saliva, exfoliated cell（un-lesion and lesion sections）, and biopsy samples. The real-time polymerase chain reaction technology was employed to explore the DNA copies of HHV-5 to 8. Results The HHV-5 positive rates in OLP samples are, WBC 50.00%（8/16）, saliva 25.00%（4/16）, biopsies 80.00%（4/5）, exfoliated cells from un -lesion sections 18.75%（3/16）and lesion sections 50.00%（8/16） respectively. The counterpart in healthy controls are, saliva 20.00%（2/10） and WBC 30.00%（3/10）, respectively. The HHV-6 positive rates in OLP samples are WBC 18.75%（3/16）, biopsies 40.00%（2/5） and exfoliated cells from un-lesion sections 12.50%（2/16） respectively. The counterpart in healthy controls is only in saliva 10.00%（1/10）. The only HHV-7 positive rate is in OLP saliva 30.00%（6/20）. The counterpart in healthy controls is also in saliva 15.00%（3/20）. However, the copy of HHV-8 could not be explored in all samples. Conclusion The Chi-square test（掊2=6.829 0, P<0.05） and the value of Pearson contingency coefficient（0.208 0） showed that HHV-5 was significantly closely related with patients with OLP, but HHV-6 and 7 were not. The number of HHV-5 DNA copy has a significant different between WBC and exfoliated cells from un-lesion sections in OLP group（P=0.001） Related Articles | Metrics

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Antimicrobial effect of photo-activated disinfection therapy in vitro and in vivo studies WANG Qian-qian1, YAO Na1, ZHAO Xiao-yi2, ZHANG Cheng-fei1,3. Inter J Stomatol. 2010, 37 (4):  392-395.  DOI: 10.3969/j.issn.1673-5749.2010.04.005 Abstract ( 1439 )   HTML ( 4 )   PDF（pc） (156KB) ( 1182 )   Save Objective To investigated the antimicrobial effect of photo-activated disinfection therapy（PAD） in association with endodontic treatment in vitro and in vivo studies. Methods In vitro study, 30 single-rooted teeth were selected and contaminated with Enterococcus faecalis ATCC29212. The specimens were randomly divided into 3 groups. PAD therapy, 2.5% NaClO irrigation（positive control） and saline solution（negative control） were used to disinfect the root canals in each group respectively. In vivo study, 50 single-root canals teeth were selected, and then randomly distributed into 2 groups. Each root canal was instrumented and irrigated with 2.5% NaClO. Then the root canals in group 1 were disinfected with PAD and the root canals in group 2 were irrigated with saline solution. Microbial sample was taken before and after instrumentation/irrigation and PAD therapy, plated onto the BHI agar and the colony forming units were counted. Results In vitro study, the bacterial counts reduced 99.86% after PAD disinfection compared with 100% in positive control group and 96.94% in negative control group. The recovery of bacteria was detected in 10 samples after PAD disinfection compared 6 samples in positive control group and 10 samples in negative control group. In vivo study, bacterial counts reduced 99.98% after instrumentation in two groups. After the PAD therapy, there was no positive colony forming units were detected in group 1, compared 36% ruduction in group 2. But no significantly difference was found between the two groups（P>0.05）. Conclusion PAD can decrease Enterococcus faecalis load in root canals, which is lower than NaClO. The use of PAD added to endodontic treatment leads to an enhanced decrease of bacterial load in infected root canals. Related Articles | Metrics

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Survey on elderly people in Chengdu about the effect of using removable partial denture CHEN Shenyuan1, CHAO Yong-lie1, DENG Yong-mei2, CHEN Chao3, LI Yuan1, ZHANG Shu-yuan1. Inter J Stomatol. 2010, 37 (4):  396-399.  DOI: 10.3969/j.issn.1673-5749.2010.04.006 Abstract ( 1245 )   HTML ( 5 )   PDF（pc） (146KB) ( 735 )   Save Objective To investigate the awareness of the oral hygiene knowledge and the satisfaction of people with removable partial denture（RPD） and the influence of RPD to oral soft and hard tissue, thus to provide suggestions for oral health education and RPD making. Methods 307 senior people in Chengdu wearing RPD were investigated, and the data were analyzed statistically. Results 307 people who were investigated have good oral hygiene habits and a higher percentage of using correct toothbrushing habits, but only 10.1% and 2.9% do scaling periodically and use dental floss respectively. The average longevity of RPD is 6.94 years. 93.8% of people think dentures should be changed unless they are broken. Only 1.0% of them pay subsequent visit every 3 to 6 months. More than 87.6% of them are satisfied with the RPD. 14.5% of abutment teeth are affected with caries. The cleanliness of the tissue surface is related to smoking, food impaction, removing dentures before going to bed or not, scaling, toothbrushing habits, denture longevity and cleaning methods of dentures in order. Conclusion RPD can achieve a preferable restoration effect. Those who wear RPD should strengthen the awareness of oral hygiene knowledge and pay subsequent visit periodically. Related Articles | Metrics

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Comparative study of measurements in experimental orthodontic tooth movement LI Gao-hua, PENG Juxiang, ZHONG Jian-li, LIU Jian-guo, GUAN Xiao-yan, XU Yu-hong, FENG Lei, SU Mu, HUANG Jin. Inter J Stomatol. 2010, 37 (4):  400-402.  DOI: 10.3969/j.issn.1673-5749.2010.04.007 Abstract ( 1286 )   HTML ( 4 )   PDF（pc） (134KB) ( 1088 )   Save Objective To evaluate the validity and accuracy of the distance of experimental orthodontic tooth movement measured by stereomicroscope and vernier caliper. Methods 60 male Sprague-Dawley rats were randomly divided into 5 groups. Each group had 12 rats. The rats were sacrificed in 1, 4, 7, 10 and 14 days after the application of mechanical force. The precise impressions were made before and after experiment. The distance of tooth movement was measured by both stereomicroscope and vernier caliper. The results were compared and had dispersion analysis. Results The results showed that all the measurements had no significant difference except the 1 and 4 days group. Dispersion analysis showed that the measurement with stereomicroscope was more accurate than with vernier caliper. Conclusion The stereomicroscope measurement can exactly accomplish the experimental measurement of tooth movement. Related Articles | Metrics

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Fiberoptic bronchoscope facilitated intubation in patients undergoing oral and maxillofacial surgery XIE Guang-lun, CHU Qin-jun, SUN Zhen-tao, WANG Yong, SONG Jin-sheng. Inter J Stomatol. 2010, 37 (4):  403-405.  DOI: 10.3969/j.issn.1673-5749.2010.04.008 Abstract ( 1176 )   HTML ( 3 )   PDF（pc） (102KB) ( 775 )   Save Objective To describe the application of fiberoptic bronchoscope（FOB） facilitated intubation in patients undergoing oral and maxillofacial surgery. Methods 122 patients with suspected difficult airway scheduled for oral and maxillofacial surgery were included in the study. All the patients were intubated under FOB facilitation with endotracheal tube after topical anesthesia or general anesthesia. The lubricated scope was inserted down the airway and the epiglottis and vocal cords were visualized by rotation and angulation of the scope. When the glottis was opening, the scope was gently introduced into trachea until about 5 cm over carina. Then the ensleeved endotracheal tube was advanced into trachea under direct vision and the scope was drawn back and out. After confirming the tip position of endotracheal tube, it was properly secured with sticking plaster. Results 122 patients were successfully intubated with facilitation of the FOB. Conclusion FOB guidance for endotracheal intubation markedly decreased the incidence of difficult intubation in patients undergoing oral and maxillofacial surgery. The application of this technique should be promoted as a standard procedure. Related Articles | Metrics

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Clinical observation of pulse Nd:YAG laser on composite resin restoration of molars with dental abrasion LI Zi-mu, QIU Li-hong, SUN Hai-yan. Inter J Stomatol. 2010, 37 (4):  406-408.  DOI: 10.3969/j.issn.1673-5749.2010.04.009 Abstract ( 972 )   HTML ( 2 )   PDF（pc） (141KB) ( 1743 )   Save Objective To evaluate the clinical effects of pulse Nd:YAG laser combined with self-etching adhesive on restoration of molars with dental abrasion on occlusal surface. Methods 38 molars with dental abrasion on occlusal surface were restored from 15 patients. Each of the patients has at least two molars or premolars eligible. The experimental group were treated with pulse Nd:YAG laser combined with Adper Prompt L-Pop selfetching adhesive, while the control group were treated with Adper Prompt L-Pop directly. The cavity was restored with light-cured composite resin Z350. The modified United States Public Health Service criteria were used to evaluate the treatment effects at recall periods for one month, six months and twelve months. Results After 12 months, The successful rate of the experimental group（94.44%） was significantly higher than that of the control group（61.11%, P＜0.05）. The stimulation to the pulp of the experimental group was significantly higher than that of the control group statistically after one month（P ＜0.05）. Statistically significant differences were observed between two groups for the retention and marginal adaptation of the restoration after 12 months（P＜0.05）. Conclusion Using of pulse Nd:YAG laser on molars with dental abrasion can improve the self-etch bonding strength of composite resin to tooth and decrease the post-operative sensitivity. Related Articles | Metrics

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Effects of two-phase treatment on the upper airway in skeletal Class Ⅲ malocclusions LIU He-ting, ZHANG Miao-miao, WANG Xu, LIU Di, ZHAI Ma-li. Inter J Stomatol. 2010, 37 (4):  409-412.  DOI: 10.3969/j.issn.1673-5749.2010.04.010 Abstract ( 1023 )   HTML ( 4 )   PDF（pc） (166KB) ( 1052 )   Save Objective To evaluate the effect of two -phase treatment on upper airway dimensions in skeletal Class Ⅲ malocclusions. Methods 18 patients with skeletal Class III malocclusion with crowding in dentition were included. These patients were consecutively treated with two phase． Lateral cephalometric radiographs were used to quantify the skeletal and upper airway changes before treatment（T1）, after maxillary protraction（T2） and after treatment（T3）, and t test was assessed to compare the significant difference between the three groups． Results The dimensions of S-PNS, Ad1, Ad2, AA-PNS, SPS increased significantly（P＜0.05）, IPS decreased significantly （P＜0.05）. The change of eb-Peb was not significant（P＞0.05）. Conclusions In young individuals with skeletal Class Ⅲ malocclusion with crowding diagnosed with maxillary deficiency treated with two-phase treatment, the upper airway dimensions were affected after the treatment, and favorable effects of the treatment appeared in nasopharynx airway. Related Articles | Metrics

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Psychological characteristics and nursing of cleft lip and palate children and their parents GONG Caixia, XIONG Mao-jing, WU Min. Inter J Stomatol. 2010, 37 (4):  413-416.  DOI: 10.3969/j.issn.1673-5749.2010.04.011 Abstract ( 1161 )   HTML ( 2 )   PDF（pc） (103KB) ( 1737 )   Save Along with the serial treatment of the cleft lip and palate patients, the psychological conditions of the patients and their parents are concerned more. The treatments and preventive arrangements of the psychological problems of the patients have become an important part of the serial treatment of cleft lip and palate patients when they are carried out surgery and other treatments being children or adolescence. By reviewing the articles and our clinical manipulation, we have performed the psychological nursing, which is an important part of the serial treatment of the patient with cleft lip and palate. The purpose of the paper was to analyze the psychological characteristics of the children with cleft lip and palate, and that of their parents. Related Articles | Metrics

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Relationship of Th17 cells and its self with periodontal disease FENG Wei1, SUN Qin-feng1,2. Inter J Stomatol. 2010, 37 (4):  417-420.  DOI: 10.3969/j.issn.1673-5749.2010.04.012 Abstract ( 1098 )   HTML ( 3 )   PDF（pc） (144KB) ( 1023 )   Save Help T cell 17（Th17）, a newly discovered subset of T cells is associated with interleukin（IL）-23 and characterized by production of IL-17, which has protective effects on body by facilitating the pro-inflammatory responses. Periodontal disease is an infection-driven chronic inflammatory disease occurring in the tooth-supporting tissue such as gingival, periodontal membrane and alveolar bone. Its pathological mechanisms are closely related to local inflammatory of periodontal tissue. This review will introduce the differentiation and fanctions of Th17 cells in addition to the relationships between Th17 cells and periodontal disease. Related Articles | Metrics

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Regulating mechanisms of dental follicle cells differentiation GUO Shu-juan, WU Ya-fei. Inter J Stomatol. 2010, 37 (4):  421-423.  DOI: 10.3969/j.issn.1673-5749.2010.04.013 Abstract ( 1282 )   HTML ( 5 )   PDF（pc） (106KB) ( 1292 )   Save Dental follicle cells are composed by a group of heterogeneous cells, that can differentiate to form the periodontium. The regulating mechanisms of cell differentiation is very complex. Epithelial to mesenchymal interactions play a critical role in dental follicle cells differentiation, which induce the programmed expression of differentiation-related genes. Meanwhile, the differentiation is regulated by a molecular network of various cytokines. Related Articles | Metrics

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Epithelial-mesenchymal transformation in malignant tumor invasion and metastasis JIANG Xiao-yun1, LIU Lai-kui2, TAO Zhen-jiang2. Inter J Stomatol. 2010, 37 (4):  424-427.  Abstract ( 976 )   HTML ( 4 )   PDF（pc） (131KB) ( 1358 )   Save Cancer metastasis is an important stage in its development, and the majority of patients died of metastasis. So the transfer has been a hot area of cancer research. Studies suggest that epithelial-mesenchymal transformation（EMT） plays a key role in malignant tumor invasion and metastasis. Studys of the origin factor in EMT and its downstream pathway in tumor growth, invasion and metastasis, and how to block this mechanism have great significance, in the early diagnosis and early treatment of the malignant tumors. Here we will give you a review about the role of epithelial-mesenchymal transformation in the embryonic tissue development, the relevant signaling pathways involved, tumor invasion and metastasis and the role in invasion and metastasis of oral cancer. Related Articles | Metrics

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Prevention and control on methicillin -resistant Staphylococcus aureus in oral and maxillofacial surgery GAO Xian-chao1, JI Tong2. Inter J Stomatol. 2010, 37 (4):  428-431.  DOI: 10.3969/j.issn.1673-5749.2010.04.015 Abstract ( 1081 )   HTML ( 4 )   PDF（pc） (150KB) ( 960 )   Save The incidence of methicillin-resistant Staphylococcus aureus（MRSA） infections is going up rapidly. There were renewed concerns for the severe harm to the life and health of people. MRSA infection is a common complication of surgery, which causes serious illness, and delayed wound healing, increased hospitalization and mortality increased duration, etc. Therefore, this paper reviews the prevalence, classification, major clinical manifestations, risk factors in oral and maxillofacial surgery, detection, prevention measures and the mechanism of drug resistance of MRSA. Related Articles | Metrics

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Research progress of tissue-engineered oral mucosa YANG Qing1, MA Xian-jie1, GE Zi-li2, GUO Shu-zhong1. Inter J Stomatol. 2010, 37 (4):  432-436.  DOI: 10.3969/j.issn.1673-5749.2010.04.016 Abstract ( 1018 )   HTML ( 9 )   PDF（pc） (168KB) ( 1413 )   Save Tissue-engineered oral mucosal equivalents have been developed and used for repair of the tissues, and from engineered tissue models to learn oral disease processes. This paper reviews different strategies used for the production tissue-engineering oral mucosal equivalents and its application. Related Articles | Metrics

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Interaction of core binding factor-α1 and parathyroid hormone related protein in chondrogenesis CHENG Gu1, LI Zu-bing2. Inter J Stomatol. 2010, 37 (4):  437-439,443.  DOI: 10.3969/j.issn.1673-5749.2010.04.017 Abstract ( 967 )   HTML ( 3 )   PDF（pc） (154KB) ( 803 )   Save Chondrocytes will differentiate and become hypertrophy in endochondral ossification. In this process, core binding factor α1（cbf-α1）, promotes the hypertrophy of the chondrocytes. But parathyroid hormone related protein （PTHrP） can delays this process through Cbf-α1-dependent and independent pathways. The following are my summarizes, on which we clearly stated about the affects of Cbf-α1 to chondrocytes and PTHrP to endochondral ossification. We also showed that how PTHrP delays the hypertrophy of the chondrocytes and how PTHrP inhibits the impression of cbf-α1. Related Articles | Metrics

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Roles of VNP20009 in solid tumor therapy LI Hao, HU Qin-gang. Inter J Stomatol. 2010, 37 (4):  440-443.  DOI: 10.3969/j.issn.1673-5749.2010.04.018 Abstract ( 1586 )   HTML ( 5 )   PDF（pc） (149KB) ( 1241 )   Save VNP20009, an attenuated strain of Salmonella typhimurium with low toxicity, selectively replicates in solid tumors and has intrinsic anti-tumor activity. VNP20009 is a promising tumor-targeting vector in gene therapy of tumors. Therapeutic effect will be enhanced by combination of VNP20009 therapy and other cancer therapies. Related Articles | Metrics

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The application of Raman spectroscopy in caries research HE Qing -yin, WEI Xi. Inter J Stomatol. 2010, 37 (4):  444-446,450.  DOI: 10.3969/j.issn.1673-5749.2010.04.019 Abstract ( 997 )   HTML ( 4 )   PDF（pc） (133KB) ( 1642 )   Save Carious lesion presents chemical and structural modification. For better diagnosis of early carious, and to detect carious therapeutic and preventive efficiency, several optical methods have been proposed and developed. Based on Raman scattering effect, Raman spectroscopy has the features of good reproducibility, high sensitivity and quantitative analysis, and it has been gradually considered in caries research as a noninvasive testing technique. This review focused on the principle and characteristics of Raman spectroscopy and its application in detecting early caries, evaluating the efficiency of chemo-mechanical caries removal and composite adhesive restoration, as well as studying caries-preventive mechanisms of laser and caries-preventive effect of fluoride. Related Articles | Metrics

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Role of epigenetics in tooth morphogenesis MA Liang, WANG Sheng-chao, ZHANG Ya-qing. Inter J Stomatol. 2010, 37 (4):  447-450.  DOI: 10.3969/j.issn.1673-5749.2010.04.020 Abstract ( 983 )   HTML ( 9 )   PDF（pc） (125KB) ( 1125 )   Save As one of the research fronts of bioscience in the age of postgenome, epigenetic inheritance has close relationship with cell differentiation, ontogenesis and evolution, aging and the development of disease. In the previous study of developmental variations of tooth morphology, the research mainly focused on the mutation of related genes of tooth morphogenesis. But during the study on tooth phenotype of monozygotic twins, researchers found that the tooth phenotypes between monozygotic twins whose genes are identical are often different from each other. So they suggested that, environment, nutrition, living habits and many other non-genetic factors can interact with gene factor and form a mode of polygenetic inheritance which has an influence on the tooth morphogenesis of descendents. Morphological study, genetic model study and related-gene study are the mostly used research methods. In this review, the epigenetic phenomena involved in the morphogenesis of teeth and research progress were discussed. Related Articles | Metrics

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Effect of diabetes mellitus on bone around the dental implant NIE Ying, ZHANG Zhi-hong. Inter J Stomatol. 2010, 37 (4):  451-453.  DOI: 10.3969/j.issn.1673-5749.2010.04.021 Abstract ( 971 )   HTML ( 3 )   PDF（pc） (100KB) ( 1008 )   Save Diabetes mellitus has been thought as one of the contraindications to dental implant in a long period of time, and diabetes patients represent a significant portion of the population, as hyperglycaemia and its complications may cause negative effect to bone formation and may lead to the implant failure. Moreover, periodontal disease, frequently co-exists with diabetes. The complications of diabetes play significant effects to success rate of oral implant, compared with the general population. A higher failure rate has been seen in diabetes patients. It is well known that oral implant in diabetes patients become a hot spot. The effect of diabetes mellitus on jaw and bone healing around the dental implant, as well as how to enhance the success rate of dental implant in diabetes mellitus were discussed in this thesis. Related Articles | Metrics

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Application research of antibacterial nano -drug on root canal disinfection ZHUANG Pei -lin, GAO Yan. Inter J Stomatol. 2010, 37 (4):  454-456.  DOI: 10.3969/j.issn.1673-5749.2010.04.022 Abstract ( 952 )   HTML ( 4 )   PDF（pc） (105KB) ( 851 )   Save Residual infection in root canal is considered to be the primary failure factor of root canal therapy. Pathogens in root canal have a strong tolerance and resistance to various antimicrobial agents through forming biofilms and other complex mechanisms, so the existing root canal disinfection measures fail to eliminate pathogens in root canal. Antibacterial nano-drug is one of frontier fields of science and technology in the recent years, and it is an effective way to solve the problems of drug tolerance and resistance. Due to its unique properties, such as small size effect and surface effect, antibacterial nano-drug has the strong permeability and antibacterial ability which brings new hope to achieve the ideal effect of root canal disinfection. This article reviewed the application research of antibacterial nano-drug on root canal disinfection. Related Articles | Metrics

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Research using different instruments to remove filling material in the root canal LI Feng -xia, TAN Hong, YE Ling. Inter J Stomatol. 2010, 37 (4):  457-459.  DOI: 10.3969/j.issn.1673-5749.2010.04.023 Abstract ( 1007 )   HTML ( 2 )   PDF（pc） (104KB) ( 845 )   Save Root canal retreatment or periapical tissue operation should be done in order to reserve tooth after the root canal therapy failed. The key of the root canal retreatment is to remove the filling material in the root canal effectively. Now there are many instruments, however none of the retreatment methods produces completely clean root canal walls, and different instruments have discrepant efficiency. This review dedescribes the significance of the root canal retreatment, focusing on the research progress in the efficiency of removing the filling material in the root canal. Related Articles | Metrics

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Progress of carbon nanotubes in the cell scaffold of bone tissue engineering WEN Hai-lin, L譈Hu-ling, WAN Qian-bing. Inter J Stomatol. 2010, 37 (4):  460-463.  DOI: 10.3969/j.issn.1673-5749.2010.04.024 Abstract ( 1082 )   HTML ( 4 )   PDF（pc） (129KB) ( 759 )   Save Recent researches about the application of carbon nanotubes（CNTs） in tissue engineering cell scaffold have developed rapidly. Cell culture suggest that CNTs displayed high rate of cell attachment and growth in vitro culture of most kinds of cells. Higher mechanical strength is also observed after CNTs is combined with other materials. So CNTs can be used for cell scaffold material of tissue engineering, and can be applied to several fields such as tissue engineering of bone, nerve and blood vessel. The related researches and the prospect of the application of CNTs in cell scaffold of bone tissue engineering are mainly reviewed in this paper. Related Articles | Metrics

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Research progress on stem cells from the apical papilla and its application in tissue engineering GUO Jun, YANG Jian. Inter J Stomatol. 2010, 37 (4):  464-466.  DOI: 10.3969/j.issn.1673-5749.2010.04.025 Abstract ( 1393 )   HTML ( 15 )   PDF（pc） (103KB) ( 1661 )   Save Recently, foreign researchers successfully separated stromal stem cells from apical dental papilla by enzyme digestion. It was found that stem cell from the apical papilla had significantly greater bromodeoxyuridine uptake rate, number of population doublings, and tissue regeneration capacity, when compared with dental pulp stem cell. The investigations suggested that stem cell from the apical papilla were a unique population of postnatal stem cell which distincted from dental pulp stem cell. Therefore, the aim of this paper was to summarize the biological characteristics of stem cell from the apical papilla, its potential role in continued root formation, and its application in engineering. Related Articles | Metrics

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Surgical-induced animal models of lip and palate cleft XU Yue, CHEN Zhen-qi, QIAN Yu-fen. Inter J Stomatol. 2010, 37 (4):  467-469.  DOI: 10.3969/j.issn.1673-5749.2010.04.026 Abstract ( 1270 )   HTML ( 1 )   PDF（pc） (96KB) ( 1075 )   Save The surgical-induced animal models are always used as experimental animals in the research of clinical therapeutics of lip and palate cleft disease. Choosing appropriate animal model is important for obtaining a reliable result which can be applicable to human beings. The present paper introduced and classified several surgical- induced animal models of lip and palate cleft as critical size defect, such as primate animal, rat, cat, dog, and rabbit, listed the methods of operation to create a lip and palate cleft model, the advantages and disadvantages, the principles of choosing an appropriate animal model, which helped the researchers to choose the experimental animal more targeted. Related Articles | Metrics

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Related research of the trauma control in extraction of the third impacted mandibular tooth ZHOU Hong-zhi, HU Kai-jin. Inter J Stomatol. 2010, 37 (4):  470-473.  DOI: 10.3969/j.issn.1673-5749.2010.04.027 Abstract ( 977 )   HTML ( 3 )   PDF（pc） (126KB) ( 1080 )   Save Extraction of the third impacted mandibular tooth is often a rather complicated surgical process. Postoperative complications occurred frequently and influenced patients′ routine life and work. Grounding on our clinical practice, we reviewed and integrated related researches to present this article for discussing. We hope that it could be a reference for clinical doctors to make an appropriate treatment plan and decision for the patient. Related Articles | Metrics

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Research progress on the treatment of frontal sinus fracture GONG Ha-ni, GUO Jun, TANG Wei, TIAN Wei-dong. Inter J Stomatol. 2010, 37 (4):  474-476,480.  DOI: 10.3969/j.issn.1673-5749.2010.04.028 Abstract ( 1179 )   HTML ( 2 )   PDF（pc） (129KB) ( 791 )   Save Only 5% to 12% patients who have craniomaxillofacial fractures have frontal sinus fractures. For the special physical location and the complex anatomical structure of frontal sinus, improper treatment to frontal sinus fractures would lead to a series of complications or sequelae, such as brain abscess, meningitis, subdural abscess, epidural abscess and superior sagittal sinus thrombosis. That would bring greater suffering to patients and even life-threatening. In recent years, there are divergent views on the principles of the treatment of frontal sinus fractures by the great development of equipments and materials. This article summarizes various views of the frontal sinus fracture treatment principles and the methods in recent years, and gives a comprehensive overview of the current progress of the frontal sinus fracture treatment-related. Related Articles | Metrics

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Development of studies on comparative proteomics of Streptococcus mutans ZENG Zheng -xiang, ZHOU Xue-dong. Inter J Stomatol. 2010, 37 (4):  477-480.  DOI: 10.3969/j.issn.1673-5749.2010.04.029 Abstract ( 1045 )   HTML ( 3 )   PDF（pc） (144KB) ( 639 )   Save The announced Streptococcus mutans genome sequence recently makes its comprehensive proteome map analysis possible. Streptococcus mutans in proteomics research will further reveal the molecular mechanism of its carcinogenicity. Comparative proteomics is an important branch of proteomics, so the paper review development of studies on comparative proteomics of Streptococcus mutans in several aspects, such as the comparative proteomics research of Streptococcus mutans to acid reaction, the comparative proteomics research of planktonic -state and biofilm-state Streptococcus mutans and so on. Related Articles | Metrics

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Research progress on the fracture resistance of all-ceramic fixed partial denture ZHANG Wen, ZHENG Mei-hua. Inter J Stomatol. 2010, 37 (4):  481-484.  DOI: 10.3969/j.issn.1673-5749.2010.04.030 Abstract ( 1114 )   HTML ( 2 )   PDF（pc） (158KB) ( 860 )   Save With the development of restorative technology and all ceramic materials, all -ceramic fixed partial denture（FPD） was gradually selected by dentists and patients who desired for metal free restoration. Owing to the brittleness of these materials, all -ceramic FPD tended to fracture. This limited their wide application in prosthodontics. In recent years, all-ceramic prothesis has further developed, because the fracture strength and aesthetics function of ceramic become better and the production process becomes easier. This article presented a review on fracture resistance of all-ceramic FPD and it included four major factors, such as materials, core and veneer ceramics, adhesion and design. Related Articles | Metrics

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Application of somatic stem cells in salivary gland tissue engineering WU Si-yuan, SU Kai. Inter J Stomatol. 2010, 37 (4):  485-487.  DOI: 10.3969/j.issn.1673-5749.2010.04.031 Abstract ( 792 )   HTML ( 1 )   PDF（pc） (107KB) ( 917 )   Save The irreversible damage of salivary gland tissue is usually caused by the radiotherapy of head and neck tumor, Sj觟gren syndrome, injury and so on. And the function of salivary gland tissue can′t be rebuilt by clinically used medicine nowadays. The tissue-engineering technology provides a new way for the clinical reconstruction of salivary gland function. And adult stem cells, as one of possible resources of seed cells, have been concerned extensivly recently. Related Articles | Metrics

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Research progress on the temporarymandibular joint remodeling of the patients with mandibular retrusion by using Herbst appliance DONG Ren-ping, WANG Chun-ling. Inter J Stomatol. 2010, 37 (4):  488-491.  DOI: 10.3969/j.issn.1673-5749.2010.04.032 Abstract ( 1052 )   HTML ( 3 )   PDF（pc） (126KB) ( 757 )   Save This article was to review the influence on the condylar, glenoid fossa and condylar position within the fossa of temporarymandibular joint（TMJ） in the treatment of Angle Ⅱ malocclusion patient with Herbst appliance, and to discuss the long-term effects of Herbst treatment. It is beneficial to clinicians to properly understand the relationship between Herbst appliance and TMJ remodeling, so as to better guide clinical application. Related Articles | Metrics

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Clinical comparison of self-ligating bracket and traditional bracket WANG Ya-ting, WANG Jun. Inter J Stomatol. 2010, 37 (4):  492-495.  DOI: 10.3969/j.issn.1673-5749.2010.04.033 Abstract ( 1353 )   HTML ( 6 )   PDF（pc） (119KB) ( 2025 )   Save Since its emergence in 1935, self-ligating brackets have been widely used in contemporary orthodontic treatment, which can be divided into active and passive self-ligating brackets. Comparing to the conventional brackets, the self-ligating brackets have the advantages of lighter force, lower friction with archwires, more convenient for clinical operation and shorter treatment time. However, the disadvantages of self-ligating brackets are poor control of teeth, such as tilting movement of teeth, and inadequate expression of torque of anterior teeth, etc. In this article, the merits and faults as well as clinical effects of self-ligating brackets in every stage of orthodontic treatment are assessed. Related Articles | Metrics