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20 January 2008, Volume 35 Issue 1 Previous Issue    Next Issue

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Effect of Gr een OrTM on the crown r etention using standardized tooth ZHENG Ming, CHENG Hui, CHEN Wen- duo，MA Shou- zhi, ZHENG Zhi- qiang, HU Zhi- gang Inter J Stomatol. 2008, 35 (1):  1-4.  Abstract ( 1422 )   HTML ( 4 )   PDF（pc） (2551KB) ( 814 )   Save Objective To evaluate the effect of Green OrTM on the crown retention using standardized tooth preparation. Methods Forty recently extracted molars were prepared by lathe. Total oclussal convergence（TOC）angle of half of the molars were 10°and the others were 20°. The cast crowns were made and the samples within each degree were randomly divided into two groups. In the experimental group，Green OrTM was applied to the samples before the cast crown cemented with glass ionomer. In the control group，the samples were only cemented with glass ionomer. The samples were stored in 37 ℃ artificial saliva for 24 h before tensile testing on an instron testing machine at a crosshead speed of 1 mm/min until failure. The surface of the specimen was observed by means of an optical and a scanning electron microscope. Results When TOC angle was 10°，the retention power of the testing force was （443.59±74.20）N of the experimental group and （509.07±69.05）N of the control group respectively. There was no statistically significant difference between the two groups （P=0.056）. When TOC angle was 20°，the retention power of the testing force was （291.57±49.27）N of the experimental group and （390.82 ±91.44）N of the control group respectively. There was statistically significant difference between two groups （P=0.009）. Conclusion When TOC angle was 10°，there was no effect on the retention power of cast crown luted with glass ionomer after using Green OrTM desensitizer. When TOC angle was 20°，Green OrTM desensitizer decreased casting retention stress when used with glass ionomer. Related Articles | Metrics

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Clinical application of mini-screw implant anchorage for anterior teeth retractio AN Zhi- liang, HU Yu- zhu, ZHAN Ying, ZHANG Zhao- hui, LIU Zhi- li Inter J Stomatol. 2008, 35 (1):  5-6.  Abstract ( 1613 )   HTML ( 10 )   PDF（pc） (19KB) ( 1192 )   Save Objective To evaluate the efficiency of mini-screw implants as orthodontic anchorage for anterior teeth retraction in orthodontics treatment. Methods Nineteen patients with maxillary or bimaxillary protrusion were selected， and they were treated with mini-screw implants as anchorage for anterior teeth retraction. The sides of cephalometric roent- genogram were taken at the beginning and the end of the treatment. Taking SN as oriterion，overlap the pictures of cephalometrics were taken at the beginning and the end of the treatment, and the movements of the first molar were observed. Exchanges of the anterior overbite and overjet，Class Ⅱ molar relationship and the improvements of facial symmetry were observed after the treatment. Results Among the nineteen patients, sixteen successfully complished the orthodontics treatment. They all set up correct relationship of overbite and overjet and successfully rectified the Class Ⅱ molar relationship. Facial symmetry obviously improved and the first molar remained stable. Conclusion Compared with the traditional strong anchorage，the homemade mini-screw implant anchorage is stronger for the molar anchorage，with which the ideal anchorage contral could be achieved. Related Articles | Metrics

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Analysis of str ess in the per iodontium of the maxillary fir st molar under the MI Fang- lin1, ZHOU Yan- ling1, HUANG Zhi - peng2, ZHANG Yang1 Inter J Stomatol. 2008, 35 (1):  7-9.  Abstract ( 1546 )   HTML ( 5 )   PDF（pc） (27KB) ( 1110 )   Save Objective The aim of this study was to analyse the stress distribution in the periodontium of the maxillary first molar used as the anchorage forces to provide biomechanical basis for the clinical practice. Methods By CT scanning and ANSYS10.0 finite element analysis software, a three- dimensional finite element model of the maxillary first molar and the periodontal tissue was established. Then, three different magnitudes of anchorage forces were applied to the molar to analyse the stress distribution in the periodontium of the maxillary first molar. Results Under anchorage forces, compressive stress distributed mostly at the mesio- buccal neck and mesio neck of the mesio- buccal root and the mesio neck of the palatal root, tensile stress distributed mostly at distobuccal neck of the disto- buccal root. The maximum stress in the periodontium was situated at the mesio neck of the mesio- buccal root. The periodontium had the tendency of mesio- palatal rotation. With the anchorage force increased, the stress in the periodontium increased. Conclusion It should be consider if the buccal of maxillary first molar can provide enough anchorage during clinical practice. Related Articles | Metrics

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Clinical observation between ProTaper nickel- titanium hand- file and stainless s XU Ying，REN Zhi- wei Inter J Stomatol. 2008, 35 (1):  10-12.  Abstract ( 1634 )   HTML ( 7 )   PDF（pc） (28KB) ( 928 )   Save Objective To compare the clinical efficacy of root canal preparation between the techniques of using ProTaper nickel- titanium hand- file and the standard hand stainless steel H file. Methods 120 teeth of 100 cases of pulpitis and periapical periodontitis were randomly divided into two groups, 60 teeth in each. 60 teeth of group 1 were used standard hand stainless steel H file and step- back technique. 60 teeth of group 2 were used ProTaper nickel- titanium hand- file preparation and crown- downward technique. The clinical efficacy was observed for three months after root canal therapy completed. Results After the root canal therapy completed, the clinical efficacy of group 2 was superior to that of group 1（P<0.05）. Conclusion Using ProTaper flexible hand- file system, the success rate of root canal preparation is high. And the techniques of using ProTaper flexible hand- file system is worthy of promotion and application. Related Articles | Metrics

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The cur r ent r esear ch situation of laminin in stomatology LI Yong- heng1，MA Su2 Inter J Stomatol. 2008, 35 (1):  13-15.  Abstract ( 1387 )   HTML ( 5 )   PDF（pc） (29KB) ( 857 )   Save Laminin is an important component of basement membrane, it has extensive biological functions through the interaction with its receptors. In the review, we summarize the structure, function and current research situation in stomatology of laminin. Related Articles | Metrics

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Aesthetic crown lengthening of upper anter ior teeth and some cor r elative probl XU Ming-ming, HU Wen- jie Inter J Stomatol. 2008, 35 (1):  16-18.  Abstract ( 1671 )   HTML ( 14 )   PDF（pc） (25KB) ( 2901 )   Save Aesthetic crown lengthening surgery usually aims at a healthy, good- looking, functional and comfortable result. For this purpose, a careful examination should be given before the operation, which is determinant to the right diagnosis. During the surgery, there are many necessary preparations, such as determinatin of the position, the ratio of crown to root, the distance between the surface of the tooth and the crest, the right method forpapillae management and coordinating with adjacent teeth. Then, the following restoration should be at the right time. Also, we should carefully choose subgingival margins. This review addresses on the above clinic problems, in hope of giving suggestions to clinicians. Related Articles | Metrics

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The advancement in the r esear ch of cytokines r elated to per iodontal disease i ZHANG Xiao- heng, ZHANG Guo- ying, YU Zhan- hai Inter J Stomatol. 2008, 35 (1):  19-21.  Abstract ( 1329 )   HTML ( 4 )   PDF（pc） (29KB) ( 854 )   Save Various cytokines contained in the gingival crevicular fluid of patients with periodontal disease can be used for diagnosis. Collecting samples from gingival crevice is an easily acceptable method by both patients and doctors due to its non- invasiveness and easy to perform repeatedly. Increasing studies focused on exploration of the role of cytokines in gingival crevicular fluid demonstrate that these cytokines are useful not only for better diagnosis and prognosis of periodontal disease, but also for better guidance and evaluation of therapy. Here we report the research progress in the cytokines related to periodontal disease in gingival crevicular fluid. Related Articles | Metrics

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Resear ch advance of or al pathogens and atherosclerosis ZHANG Ming - zhu, LIANG Jing - ping Inter J Stomatol. 2008, 35 (1):  22-25.  Abstract ( 1409 )   HTML ( 4 )   PDF（pc） (37KB) ( 1191 )   Save The links between the oral infection and atherosclerosis have been well documented by current epidemiological data. Oral infection contributes to atherosclerosis directly and indirectly in some ways, which are including that oral pathogens invade the artery endothelial cells, damage the endothelial cells, increases the Creactive protein level, up- regulate the inflammatory gene and inflammatory cytokine production, trigger platelet aggregation and affect the vessel wall via inflammatory and immune responses. This article reviews the current understanding about the relationship between oral pathogens and atherosclerosis. Related Articles | Metrics

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Transforming growth factor-β and integrin regulate periodontal tissues rebuildin GAO Hai - tao1, LIU Jian- guo1, XU Yu- hong2 Inter J Stomatol. 2008, 35 (1):  26-28.  Abstract ( 1275 )   HTML ( 5 )   PDF（pc） (29KB) ( 874 )   Save Integrin is a major adhesion molecule involved in periodontal tissue remodeling. Ttransforming growth factor- β（TGF- β） peptide is a multifunctional growth factor, which may affect the regulation of integrin and the remodeling of periodontal tissue. The purpose of this article is to review the role of TGF- β on the regulating of integrin and the periodontal tissue remodeling. Related Articles | Metrics

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The relationship between cobaltion and human health as well as microbacteria ZHANG Xiao- ling, LIU Jian, HUANG Hong, GAO Ning Inter J Stomatol. 2008, 35 (1):  29-31.  Abstract ( 1763 )   HTML ( 5 )   PDF（pc） (28KB) ( 2899 )   Save Nickel- based alloys and cobalt- based alloys are widely used in dental clinical restoration. However, they may be corroded in oral circumstance over a long period of time, and the biological effect produced by long- term contact of metal ions released from erosion and tissue cells is worth taking into account. This paper summarizes the relationship between cobalt ion and human health as well as microbacteria. Related Articles | Metrics

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Factors effecting the prognosis of posterior teeth with vertical fractur e ZHU Ya - nan, WANG Wen - mei Inter J Stomatol. 2008, 35 (1):  32-34.  Abstract ( 1370 )   HTML ( 4 )   PDF（pc） (26KB) ( 1016 )   Save Vertical fractures occur frequently in the posterior teeth. The prognosis of vertical fracture teeth is poor and the extraction is undertaken usually. Different approaches have been attempted to treat the vertical fractures teeth. However, an effective treatment for complete vertical fracture teeth has not been confirmed yet. The article summarized the factors effecting the prognosis of posterior teeth fractured vertically. Related Articles | Metrics

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Progresses on the study of microRNA′s regulation mechanism GAO Ning, LI Long- jiang Inter J Stomatol. 2008, 35 (1):  35-37.  Abstract ( 1392 )   HTML ( 5 )   PDF（pc） (27KB) ( 715 )   Save MicroRNAs are a series of short non- coding RNAs that can regulate the expressions of protein- coding genes posttranscriptionally. Their functions are related to many biology progresses and diseases including tumor. The review tries to do a short introduction of the research progresses on the regulation mechanism of microRNAs. Related Articles | Metrics

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The study on the PAX 9 related with oligodontia CUI Juan- juan, LI Wu- li, MEI Ling- xuan Inter J Stomatol. 2008, 35 (1):  38-40.  Abstract ( 1273 )   HTML ( 4 )   PDF（pc） (28KB) ( 905 )   Save Tooth agenesis is a common kind of tooth dysplasia and it can be divided into the hypodontia, oligodontia and anodontia. The oligodontia, which can be inherited as an autosome- dominant, autosome- recessive, or X- linked trait, consists of two types: syndromic oligodontia and non - syndromic oligodontia. The oligodontia happens with familial heredity background or not. The article summarizes the relationship between the PAX 9 gene mutation of patient and the oligodontia. Related Articles | Metrics

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Safety assessment of adenoviral- mediated transfer of human bone morphogenetic protein gene BU Tao， WANG Xu- xia Inter J Stomatol. 2008, 35 (1):  41-43.  Abstract ( 1241 )   HTML ( 3 )   PDF（pc） (29KB) ( 649 )   Save Adenoviral- mediated transfer of human bone morphogenetic protein（BMP）gene is a useful way to induce osteogenic differentiation with BMP. The practical application is limited by the safety and toxicity of this treatment modality. Studies in the safety assessment of adenoviral- mediated transfer of human BMP- gene in recent years have been reviewed in this article. Related Articles | Metrics

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Resear ch progression of finishing and polishing technique of composite resin WANG Dan - feng, SONG Guang- tai Inter J Stomatol. 2008, 35 (1):  44-47.  Abstract ( 1356 )   HTML ( 8 )   PDF（pc） (34KB) ( 1805 )   Save The property of composite resin and etching technique have been improving progressively and adhesive dentistry has evolved quickly, as a result, direct adhesive restorations are used increasingly in clinic. It is generally agreed that appropriate finishing and polishing procedures play an important role in improving the quality and longevity of resin composite restorations. Meanwhile, some clinical problems such as gingival irritation, surface staining, plaque accumulation and secondary caries can be avoided efficiently. Accordingly, this review mainly formulates the relationship between the methods of finishing and polishing and surface roughness of resin composite, relative factors that influences finishing and polishing, criteria that evaluates the effect of finishing and polishing. Related Articles | Metrics

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Process in taste buds after denervation WANG Qin, LI Jin, LIAO Gui- qing Inter J Stomatol. 2008, 35 (1):  48-50.  Abstract ( 1257 )   HTML ( 4 )   PDF（pc） (27KB) ( 1510 )   Save Taste buds are gustatory organs of the body which administer the sweet, salty, acid and bitter taste. Recent researches have investigated that the genesis and development of taste buds are important relationship with gustatory nerves. The injury or depletion of the gustatory nerves would cause a serials of changes on taste buds. This review summarizes new finds in the morphous, function and related factors of taste buds after denervation. Related Articles | Metrics

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Remodeling changes in the subchondr al bone of the temporomandibular joints XU Yue1, CHEN Yang- xi2 Inter J Stomatol. 2008, 35 (1):  51-53.  Abstract ( 1702 )   HTML ( 9 )   PDF（pc） (25KB) ( 1345 )   Save Remodeling mechanisms of the temporomandibular joint play an important role in the basic research of the orthopedic orthodontic treatment and temporomandibular joint disorders. Subchondral bone was one of the several tissues involved in the temporomandibular joint. It has a significant mechanical function of transmitting loads from the cartilage in the underlying cancellous bone and has been implicated in remodeling of the joint. In this article, the anatomic structure, physiological function, pathological change and the remodeling process of the subchondral bone have been reviewed. Related Articles | Metrics

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Expression and significance of osteopontin in head and neck squamous cell carcino JIANG Lei, JIANG Xiao - zhong, ZHAO Yun - fu Inter J Stomatol. 2008, 35 (1):  54-57.  Abstract ( 1391 )   HTML ( 3 )   PDF（pc） (36KB) ( 718 )   Save Osteopontin（OPN）is an integrin- binding protein, believed to be involved in a variety of physiological cellular functions. It has shown to play an important role in tumor genesis, tumor invasion, and metastasis in breast, lung, prostate, and colon cancers. By reviewing related literature，we realized that in the head and neck region, over- expression of OPN was found only in dysplastic and squamous cell carcinoma（SCC） and not in normal mucosa. The expression levels suggesting a correlation between OPN function with malignancy and metastasis. We hope in the near future the osteopontin could be used as a potential target of SCC therapy. Related Articles | Metrics

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Hypoxia inducible factor-1α and or altumor therapy ZHAO Yun1, SUN Shan- zhen1, QU Xun2 Inter J Stomatol. 2008, 35 (1):  58-61.  Abstract ( 1484 )   HTML ( 2 )   PDF（pc） (37KB) ( 1168 )   Save Hypoxia inducible factor- 1α（HIF- 1α）is a key factor of cell hypoxia adaptation and response mediation and plays a pivotal role in many physiological and pathologic processes, such as inflammatory diseases and tumor. The study of HIF- 1αcontrolling tumor biological characteristic changes becomes a present hotspot of tumor research. It has been shown that over expression of HIF- 1α in many animal and human tumor influences on tumor growth, angiogenesis, apoptosis, invasion and metastasis properties through controlling its downstream genes. Recently, great achievements have been made in the relationship between HIF- 1α and development of head and neck neoplasm based on HIF- 1αtherapy strategies. In this review, it was discussed relevant literatures on HIF- 1α with research progress in oral tumor therapy. Related Articles | Metrics

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Regeneration of nerve in composite tissue allotransplantation GUO Hai- xiao, LIN Li- song Inter J Stomatol. 2008, 35 (1):  62-64.  Abstract ( 1460 )   HTML ( 2 )   PDF（pc） (27KB) ( 1230 )   Save Composite tissue allotransplantation is an ideal treatment for reconstructing the serious damagely organization, but functions of the allograft after transplanted, such as the sense and the movement function, depend on the regeneration and restoration of the nerve. This article summarized the regeneration mechanism, the animal experiment and the clinical neuranagenesis of the nerve in the composite tissue as well as the immunological treatment after transplantation. Related Articles | Metrics

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Advancement about maxillary sinus floor elevation SUN Xiao - juan, JIANG Xin - quan, ZHANG Zhi - yuan Inter J Stomatol. 2008, 35 (1):  65-67.  Abstract ( 1560 )   HTML ( 3 )   PDF（pc） (29KB) ( 1320 )   Save The maxillary sinus floor elevation is the effective way to resolve the inadequate bone height in the posterior region of the maxilla in order to promote stability of endosseous implants. In a long term, autogenous bone from iliac bone is regarded as a“gold standard”, but pain and infection in donor site are often associated with bone grafting. The application of tissue engineering technique and growth factors have overcome the drawbacks in traditional methods and have become a new advancement about sinus floor elevation. This is a review about the new advancement. Related Articles | Metrics

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Application of vir tual endoscopy in head and neck surgery SU Yu- xiong, LIAO Gui - qing Inter J Stomatol. 2008, 35 (1):  68-70.  Abstract ( 1272 )   HTML ( 3 )   PDF（pc） (28KB) ( 1311 )   Save In recent years, virtual endoscopy has been performed widely in the medical fields. Virtual endoscopy is the computer - generated simulation of endoscopic images derived from three - dimensional magnetic resonance imaging data sets and is used to view the inner surface of hollow organs in a continuous fashion with optical, video- assisted technology. In the field of head and neck, virtual endoscopy is used to simulate the endoscopic view of the nose and sinus, larynx, inner ear, ventricle and salivary gland. Virtual endoscopy can play an indispensable role in imaging diagnosis, presurgical plan, image guided surgery, and in the education and training system for endoscopic surgery trainers and medical students. Related Articles | Metrics

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Influence of r emovable par tial dentur e on or al microecosystem DONG Cong, ZHANG Fu- qiang Inter J Stomatol. 2008, 35 (1):  71-73.  Abstract ( 1638 )   HTML ( 3 )   PDF（pc） (25KB) ( 1666 )   Save Removable partial denture, which is used extensively, is one of the effective treatments for the defect of dentition. However, it may have influence on oral microecosystem, such as inducing caries and periodontal disease. This article reviewed the influence of removable partial denture on oral microecosystem. Related Articles | Metrics

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Correlation between head and neck posture and temporomandibular disorders HUANG Zhuo- shan, LIN Xue - feng Inter J Stomatol. 2008, 35 (1):  74-76.  Abstract ( 1407 )   HTML ( 4 )   PDF（pc） (27KB) ( 2432 )   Save The head and neck posture, especially its correlation with temporomandibular disorders（TMD）, has been investigated and debated for many years. This study was carried out a review about the influencing factor of head and neck posture, the change of head and neck posture in individuals with TMD, the possible mechanism that abnormal head and neck posture evoked to TMD. Related Articles | Metrics

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Clinical features and prosthodontics of hypohydrotic ectodermal dysplasia DU Rui- tian, LI Yan Inter J Stomatol. 2008, 35 (1):  77-79.  Abstract ( 1387 )   HTML ( 4 )   PDF（pc） (26KB) ( 1359 )   Save Hypohydrotic ectodermal dysplasia is a common group of hereditary diseases, with congenital tooth loss as the predominant oral symptom. The prosthodontics of hypohydrotic ectodermal dysplasia is special because most of the affected patients are pre- adolescents, whose jaw bones and alveolar process are lack of development. A sequence treatment option is applied in the treatment procedure. This review included the clinical features and prosthodontics of hypohydrotic ectodermal dysplasia, depending on large numbers of relavant literatures. Related Articles | Metrics

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Research of hydrostatic splint and NTI- tss splint CHENG Hui-juan, ZHANG Fu-qiang Inter J Stomatol. 2008, 35 (1):  80-82.  Abstract ( 1404 )   HTML ( 3 )   PDF（pc） (1045KB) ( 1442 )   Save Splint is one of useful therapy methods of temporomandibular joint disorcler（TMD）. Because of its effective and reversible characteristic, it is wildly used on clinical therapy of TMD. Every kind of splint has its own indication and characteristic. This article talked about characteristics, effectiveness and indications of the two special kinds of splints, and compared with some traditional splints. Related Articles | Metrics

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Mechanism and evaluation method of dental mater ials abr asion GAO Xiu - fang, ZHANG Lian - yun, LI Chang- yi Inter J Stomatol. 2008, 35 (1):  83-84.  Abstract ( 1578 )   HTML ( 5 )   PDF（pc） (27KB) ( 941 )   Save Dental prosthetic restoration usually takes its function for years in vivo. It has a fairly large potential abrasion. The function of abrasion among materials plays a significant part in long- term application of dental prosthetic restorations, which has an essential effect on prosthetic effect of dental prosthetic replacements. So abradability is one of the important factors to choose prosthetic material. This article is a brief introduction about the abrasion mechanism and its evaluation method for dental materials besides abroad- applied abrasion test machines. Related Articles | Metrics

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Effect on skeletal and dental changes with tr eatment of r apid maxillary expansion ZHAO Xiao- jing1, LI Liang- zhong2 Inter J Stomatol. 2008, 35 (1):  85-87.  Abstract ( 1292 )   HTML ( 4 )   PDF（pc） (30KB) ( 1031 )   Save Rapid maxillary expansion is a method which is often being used to treat the transverse discrepancy of widths of maxilla. The objective of this study was to review and summarize the progress of the effect on the skeletal and dental changes with the treatment of rapid maxillary expansion combining the recent internal and aboard articles and to supply the instruction on its clinical application and scientific research. Related Articles | Metrics

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Study of palatally impacted maxillary canine ZHANG Sheng, MAI Li - xiang, WANG Da- wei Inter J Stomatol. 2008, 35 (1):  88-90.  Abstract ( 1575 )   HTML ( 3 )   PDF（pc） (25KB) ( 1354 )   Save Palatally impacted maxillary canine is common in clinic which affects the function and aesthetic of maxillary teeth. In order to eliminate its adverse influence on growth and development of teeth and jaw, early diagnose and correct treatment are needed. Incidence, etiology, diagnose, clinical treatment and prognosis of palatally impacted maxillary canine were summarized in this review. Related Articles | Metrics

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Application of distr action osteogenesis in or thodontic ar ea HUANG Li, YANG Si- wei Inter J Stomatol. 2008, 35 (1):  91-93.  Abstract ( 1475 )   HTML ( 5 )   PDF（pc） (29KB) ( 969 )   Save Distraction osteogenesis is a process of growing new bone by mechanical stretching of the preexisting bone tissue or suture. It has been applied to the treatment of the dental maxillo- facial deformity and has attained notable success. In this article, the application of distraction osteogenesis in orthodontic area was reviewed. Related Articles | Metrics

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The application of Porphyromonas gingivalis in the pr evention and cur e of per i GUO Hong- mei, YANG Pi- shan Inter J Stomatol. 2008, 35 (1):  94-96.  Abstract ( 1300 )   HTML ( 9 )   PDF（pc） (38KB) ( 955 )   Save Periodontitis with the high prevalence is one of the two main diseases in oral cavity. It is important to explore the effective prevention against periodontits. The article introduces the researches on prevention and therapy of periodontitis with different antigens of Porphyromonas gingivalis including fimbriae, hemagglutinin, gingipains and outer membrane protein. Related Articles | Metrics

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Relationship between Saccharomyces albicans and car ies LU Li- ying, ZOU Jing Inter J Stomatol. 2008, 35 (1):  97-99.  Abstract ( 1535 )   HTML ( 2 )   PDF（pc） (28KB) ( 701 )   Save Caries are chronic infectious diseases and the consequence of oral ecologic disequilibrium. According to the recent studies, Streptococcus mutans, Lactobacillus, Actinomyces viscosus are the major caries pathogens. Saccharomyces albicans was reported that may be one of the caries pathogens. In this article we summurize these studies about their relationship. Related Articles | Metrics