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20 July 2011, Volume 38 Issue 4 Previous Issue    Next Issue

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The differentiation of materials and methods of all-ceramic restorations Liu Feng. Inter J Stomatol. 2011, 38 (4):  373-377.  DOI: 10.3969/j.issn.1673-5749.2011.04.001 Abstract ( 1157 )   HTML ( 15 )   PDF（pc） (138KB) ( 1324 )   Save All-ceramic materials include glass-ceramics, glass-infiltrated ceramics, pure alumina core system and zirconia core system; and all-ceramic restoration methods include crown, veneer and ceramic-bonding restorations. Different match of materials and methods will lead to different treatment result. The most suitable match can help dentists lower the risk. For most vital teeth, the most suitable design is veneers or bonded-ceramic restorations; but for unvital anterior teeth, glass-ceramic is not suitable, and in most cases zirconia crown is the best choice, or in serious strained teeth glass-infiltrated ceramic could be used; in vital posterior teeth, zirconia crown is the most suitable treatment plan, whose retention force can be increased by assistant retention form like axis grooves or pin hole, and strength can be enhanced by high cervical rings or full-zirconia design. Related Articles | Metrics

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Research of treatment failure with 28 poster teeth after root canal therapy Ran Zhu. Inter J Stomatol. 2011, 38 (4):  378-379.  DOI: 10.3969/j.issn.1673-5749.2011.04.002 Abstract ( 1572 )   HTML ( 14 )   PDF（pc） (79KB) ( 1290 )   Save Objective To analyze the causation of treatment failure after root canal therapy. Methods Use root canal retreatment, apical surgery and periodontal surgery to retreat the failed cases. Results In 28 treatment failure of poster teeth after root canal therapy, 11 teeth are intracanal infection, 7 teeth are crown leakage, 7 teeth are root vertical fracture and the other 3 teeth are periodontal infection. Conclusion Intracanal infection is the material cause of failure of root canal therapy, and vertical root fracture is another important cause. Related Articles | Metrics

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Application of Activator in the treatment of skeletal Class Ⅱ malocclusion Nie Pan, Li Jing, Li Wei. Inter J Stomatol. 2011, 38 (4):  380-383.  DOI: 10.3969/j.issn.1673-5749.2011.04.003 Abstract ( 1001 )   HTML ( 4 )   PDF（pc） (245KB) ( 484 )   Save Objective To evaluate the effect of activator appliance on hard and soft tissue of growing patients who have skeletal Class Ⅱ malocciusion. Methods Pretreatment and posttreatment cephalometric records of 30 consecutively treated Patients with Class Ⅱ malocclusions were evaluated and compared with 20 volunteers of untreated Class Ⅱ control subjects. Lateral cephalometric and study models were taken at the beginning and the end of the treatment. Paired t tests were used to assess differences in the rates of change of the different variables in the treatment and control groups. Results The changes of SNA, SNB, ANB, Go-Gn, Ar-Go, S-Go, N-Me between two groups have statistically significance, the mandible horizontal growth became normal. Conclusion Activator appliance treating skeletal ClassⅡmalocclusion in growing patients not only inhibit maxillary growth and reduce the maxillary protrusion, but also promote the mandible growth. Related Articles | Metrics

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Effect of cyclic stretch on human periodontal ligament fibroblast proliferation Shao Yang1, Zhang Guangyun2, Yuan Xiao2. Inter J Stomatol. 2011, 38 (4):  384-387.  DOI: 10.3969/j.issn.1673-5749.2011.04.004 Abstract ( 1154 )   HTML ( 3 )   PDF（pc） (350KB) ( 721 )   Save Objective To study the cyclic stretch on human periodontal ligament fibroblasts（hPDLF） prliferation and its mechanism. Methods In vitro culture -tensile stimulate models of hPDLF were established by using a multi-passage load adding system. Cyclic stretch was applied on the fibroblasts for 1, 2, 4, 6, 12 and 24 hours, respectively, the load was set for 10% surface elongation, with frequency 0.1 Hz. At the same time, the normal control group was established by static group. The cell promote was determined by cell counting kit-8（CCK-8） method; and the expression of mRNA was detected on proliferating cell nuclear antigen（PCNA） and nuclear factor- κB（NF-κB） by RT-PCR technology. Results Compared with static group, the proliferation activity of hPDLF was decreased in 1, 2 h; hPDLF began to proliferate in 6 h, cell proliferation reached the peak in 12 h; the proliferation of hPDLF were inhibited obviously. Pyrrolidine dithiocarbamate（PDTC） inhibited cell proliferation and inhibited mRNA expression of PCNA and NF-κB；and the differences between the two groups were significant. Conclusion In a certain time, within the scope of cyclic stretch can promote the in vitro hPDLF proliferation; as time went by, the hPDLF was obvious inhibition. NF-κB signaling pathway play an important role during cyclic stretch-induced hPDLF proliferation. Related Articles | Metrics

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Expression of alkaline phosphatase mRNA of tissue engineering bone in vivo Sun Lanying1, Wang Qibao1, Bao Chongyun2, Ge Wenzhang1, Du Yi1. Inter J Stomatol. 2011, 38 (4):  388-391.  DOI: 10.3969/j.issn.1673-5749.2011.04.005 Abstract ( 1196 )   HTML ( 2 )   PDF（pc） (272KB) ( 451 )   Save Objective To detect the expression of alkaline phosphatase（akp） mRNA in in vivo tissue engineering bone constructed with calcium phosphate cement and do a comparison with that in naturally healing bone. Methods 28 porous calcium phosphate cement cylinders were implanted into the dorsal muscles of 7 dogs respectively and one molar was pulled out in each dog to create naturally healing bone model. The in vivo tissue engineering bone and the naturally healing bone were harvested at 3/7, 1, 2, 4, 8, 12 and 24 weeks post-implantation. Then, akp mRNA was detected by real-time quantitative polymerase chain reaction（PCR）. Results In this experiment akp mRNA was expressed at lower levels with delayed peak in in vivo tissue engineering bone than that in naturally healing bone. However, the expression of akp mRNA shared a similar pattern of initially upregulated and finally down-regulated in the two kinds of bone. Conclusion The in vivo tissue engineering bone is calcified later and fewer than natrually healing bone. However, the gene expression pattern is similar to that of naturally healing bone in bone formation. Related Articles | Metrics

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Changes in alveolar bone thickness due to retraction of lower anterior teeth Li Jialing1, Li Xiaobing2, Li Jiayuan3. Inter J Stomatol. 2011, 38 (4):  392-394.  DOI: 10.3969/j.issn.1673-5749.2011.04.006 Abstract ( 1695 )   HTML ( 11 )   PDF（pc） (150KB) ( 589 )   Save Objective To investigate the changes of alveolar bone thickness after retraction of lower incisor. Methods 47 patients of slight crowding and four first premolars extracted for orthodontics purpose, were collected as study samples. Their pre- and post treatment cephalometric films were analyzed by blind method for hard and soft tissue changes and remodeling of anterior alveolar after treatment. Paired t test was used to evaluate the hard and soft tissue changes with SPSS 13.0 software package. Results The cephalometric values demonstrated that: Lower incisor alveolar thickness showed a significant decrease after incisor retraction. From sagittal view, the lingual cortical plate thickness reduced more than the labial one; from vertical view, alveolar bone thickness at the apical level decreased more than that at the coronal level. Conclusion The absorption of alveolar bone exceed the apposition during lower incisor retraction, so that the alveolar thickness decreased significantly. The labial and lingual cortial plates at the level of incisor apex may represent the anatomic limits of tooth movements which help doctors to make treatment decisions. Related Articles | Metrics

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Intrusive auxiliary arch can correct the anterior deep bite in adult patients effectively Deng Xiaoshu1, Huang Ning2, Chen Xudao3, Huang Lieping4. Inter J Stomatol. 2011, 38 (4):  395-398.  DOI: 10.3969/j.issn.1673-5749.2011.04.007 Abstract ( 1996 )   HTML ( 9 )   PDF（pc） (426KB) ( 812 )   Save Objective To assess the clinical effect and mechanism of intrusive auxiliary arch in correcting the anterior deep bite in adult patients. Methods Select 16 adult patients with deep bite of anterior teeth, who were treated by the intrusive auxiliary arch and fixed orthodontic appliances. Measure the changes of anterior teeth and posterior teeth through the cephalometric and clinical examination before and after treatment. Deep bite through the cephalometric before and after treatment. Results The anterior teeth were intruded about 2 mm vertically, no significant changes in horizontal direction after treatment; the posterior teeth change little vertically and horizontally; the deep bites of anterior teeth in adult patients were corrected by using the intrusive auxiliary arch. Conclusion The intrusive auxiliary arch can correct the deep bite of anterior teeth in adult patients effectively without patients’compliance. Related Articles | Metrics

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Application of metabonomics for analysis of extracellar metabolites of Streptococcus and Actinomycetes Yuan Yi, Guo Qiang, Li Mingyun, Xiong Ping, Li Jiyao, Zhu Zhu, Li Yan, Gong Qimei, Xiao Xiaorong, Xiao Liying. Inter J Stomatol. 2011, 38 (4):  399-402.  DOI: 10.3969/j.issn.1673-5749.2011.04.008 Abstract ( 1185 )   HTML ( 8 )   Save Objective To investigate the application of metabonomics in research of oral bacteria, through detecting different of the extracellular metabolites, and find the characteristic metabolic profile of each oral bacteria. Methods 1H-nuclear magnetic resonance（NMR） spectra were obtained from each microbial culture at late exponential growth phase. The obtained data were processed by both the unsupervised principal component analysis （PCA） and the supervised partial least squares discriminant analysis（PLS-DA） to find out the differences among the three groups. Results These 1H-NMR spectrograms of each bacteria are obviously different. The result of pattern recongnition presented marked clustering between the three group. PLS-DA analysis has the better effect to different these samples. Conclusion The results indicated that the 1H-NMR-based extracellular metabonomic approach is a feasible and efficient method for differentiating and analyzing oral bacteria. Related Articles | Metrics

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Study on collagen membrane as growth factors delivery carrier materials to accelerate mandibular fracture healing Chen Jianlin1, Yang Zhe1, Tang Yanfeng2，3, Hu Xueqing1, Zhang Jizhong1, Zhou Ye1, Zheng Xiaohui2. Inter J Stomatol. 2011, 38 (4):  403-406.  DOI: 10.3969/j.issn.1673-5749.2011.04.009 Abstract ( 1155 )   HTML ( 4 )   PDF（pc） (252KB) ( 660 )   Save Objective To explore the possibility of collagen membrane to accelerate mandibular fracture healing. Methods 12 New Zealand rabbits were randomly divided into two groups, the mandibular fracture model on both sides were prepared. Left was rb -bFGF/rhBMP -2/collagen membrane as experimental group, and right was the control group. Hematoxylin-eosin（HE） staining, Masson staining and India ink staining were taken at the 2, 4, 12 weeks after surgery. Results HE and Masson staining showed: After 2 weeks, more fibrous tissue and blood vessels were seen between the fracture ends in the experimental group than the control group. There were some fibrous cartilages forming in the edge of the fracture ends in the experimental group. After 4 weeks, fibrous fracture callus were seen in the fracture gap in the experimental group. The ingrowths of fibrous tissue and blood vessels were seen in the control group. After 12 weeks, bone healings were seen in both groups. The bony trabecular directions were tidier in the experimental group than in the control group. India ink staining showed: After 2 weeks and 4 weeks, the vascular densities in the experimental group were significantly more than in the control group. There was little difference between the two groups after 12 weeks. Conclusion rb-bFGF/rhBMP-2/collagen membrane could accelerate fracture healing. Related Articles | Metrics

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The expression of Survivin in oral lichen planus and oral squamous cell carcinoma Shang Junlan, Li Aixia, Mao Lanping, Liu Pei, Liu Xiaojin, Sun Minglei. Inter J Stomatol. 2011, 38 (4):  407-409.  DOI: 10.3969/j.issn.1673-5749.2011.04.010 Abstract ( 1208 )   HTML ( 3 )   PDF（pc） (217KB) ( 411 )   Save Objective To study the expression and clinical significance of survivin, a novel member of inhibitor of apoptosis protein family, in oral lichen planus（OLP） and oral squamous cell carcinoma（OSCC）. Methods Streptavidin-percocidase immunohistochemical technique was used to detect the expression of survivin protein in 40 cases of OSCC, 40 cases of OLP tissues and 26 cases of normal oral mucosa, and its dependability was analyzed. Results The positive expression of survivin was detected in 22 cases of OSCC tissues（55%）, in 12 cases of OLP tissues（30%）, and in 1 case of normal oral mucosa（4%）. The positive rates of survivin expression were significantly higher in OSCC and OLP than the normal oral mucosa（P＜0.05）. Conclusion Survivin gene maybe one of the important factors in the development and progress of OSCC and OLP. Survivin may has relationship with the process of OLP transform to OSCC. Related Articles | Metrics

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2 cases report about synovial chondromatosis of the temporomandibular joint Chen Shujun1, Han Xiaoxian1, Ji Ning1, Mei Yabo2, Chen Yuxuan1, Lin Xuemei1, Niu Xuegang1. Inter J Stomatol. 2011, 38 (4):  410-411.  DOI: 10.3969/j.issn.1673-5749.2011.04.011 Abstract ( 1073 )   HTML ( 3 )   PDF（pc） (191KB) ( 523 )   Save Synovial chondromatosis is a rare disease and rarer on temporomandibular joint. Only 51 cases affecting temporomandibular joint were reported in English literature from 1980 to 2000. We report 2 cases of synovial chondromatosis of temporomandibular joint. Case 1 involves a 45-year-old woman presented 10 years history in left temporomandibular joint. Case 2 involves a 70-year-old woman in the same site with 30 years history. Pathological examinations support a diagnosis of synovial chondromatosis. Two of them underwent surgical operation, and good clinical results were gained. Related Articles | Metrics

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Role of small integrin-binding ligand N-linked glycoprotein family in tooth development Hou Chao, Li Shu. Inter J Stomatol. 2011, 38 (4):  412-415.  DOI: 10.3969/j.issn.1673-5749.2011.04.012 Abstract ( 1012 )   HTML ( 3 )   PDF（pc） (141KB) ( 646 )   Save Small integrin-binding ligand N-linked glycoprotein family（SIBLING） is a group of proteins which is mainly expressed in tooth and bone tissue. It’s gene possesses common structure of exon and intron and influences the proliferation and differentiation of cells. The predominant members of SIBLING family at present contain osteopontin, bonesialoprotein, dentin sialophosphoprotein, dentin matrix protein-1, matrix extracellular phosphoglycoprotein, enamelin and so on. This is a review of the research progress in SIBLING in tooth develepment. Related Articles | Metrics

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Research progress on gene involved in non-syndromic tooth agenesis Ye Niansong, Wang Sheng, Lai Wenli. Inter J Stomatol. 2011, 38 (4):  416-418.  DOI: 10.3969/j.issn.1673-5749.2011.04.013 Abstract ( 1188 )   HTML ( 6 )   PDF（pc） (136KB) ( 955 )   Save Tooth agenesis refers to tooth absence during tooth development, including hypodontia, oligodontia and anodontia. Tooth agenesis, which is grouped into syndromic and non-syndromic（isolated） types according to the existence of concomitant abnormalities, could be trigered by autosomal dorminant, autosomal recessive and X-linkage inheritence under either family or isolated backgroud. Progress involving paired box gene-9, muscle segment homeobox gene-1, axis inhibitor-2, ectodermal dysplasia in associate with non-syndromic tooth agenesis is reviewed here. Related Articles | Metrics

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MicroRNA-140 and its function in craniofacial development Li Ling, Shi Bing. Inter J Stomatol. 2011, 38 (4):  419-422.  DOI: 10.3969/j.issn.1673-5749.2011.04.014 Abstract ( 848 )   HTML ( 1 )   PDF（pc） (142KB) ( 573 )   Save MicroRNA-140 is one of the factors that regulate craniofacial development of vertebrates, and thus has important biological functions. Here we compared the differences of maturation and target recognition between general microRNA and microRNA-140. Moreover, we reviewed the craniofacial development regulation of micro- RNA-140. Related Articles | Metrics

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Research progress on osteoclasts to promote bone remodeling Zhao Juan1, Huang Xu2, Liu Li1. Inter J Stomatol. 2011, 38 (4):  423-425.  DOI: 10.3969/j.issn.1673-5749.2011.04.015 Abstract ( 1126 )   HTML ( 1 )   PDF（pc） (145KB) ( 842 )   Save Bone remodeling is of important value in dental research, and osteoclasts play a positive and nonsubstitutive role in bone remodeling. However, there are limited researches and clinical therapeutic strategy for bone diseases aiming at the coupling between osteoclasts and osteoblasts, in other words, making use of the positive effect of osteoclasts to promote bone remodeling. This review focused on research progress on the dynamic coupling between bone resorption and bone formation, the positive effect of osteoclasts to promote bone remodeling and its underlying molecular mechanism. Related Articles | Metrics

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Research progress on extracelluar matrix in Enterococcus faecalis biofilm Li Weilan, Xu Qiong. Inter J Stomatol. 2011, 38 (4):  426-429.  DOI: 10.3969/j.issn.1673-5749.2011.04.016 Abstract ( 946 )   HTML ( 2 )   PDF（pc） (149KB) ( 889 )   Save Enterococcus faecalis is a predominant organism that plays a major role in the etiology of persistent periradicular lesions after root canal treatment by forming biofilms. The matrix, which holds bacterial biofilms together, is a complex mixture of macromolecules including expolysaccharides, nucleic acid and protein. Extracelluar matrix contributes significantly to bacterial adhesion, biofilm structure and information exchanging between bacterias. This review mainly focused on the bioflim structure, extracelluar matrix and ways to eliminate the Enterococcus faecalis biofilm. Related Articles | Metrics

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Research progress on variable but non -culturable state in Enterococcus faecalis E Jia, Liang Jingping. Inter J Stomatol. 2011, 38 (4):  430-432.  DOI: 10.3969/j.issn.1673-5749.2011.04.017 Abstract ( 999 )   HTML ( 2 )   PDF（pc） (123KB) ( 777 )   Save The viable but non-culturable（VBNC） state is a physiological state when bacteria are exposed to adverse environments. The biological characteristics of bacteria entering the VBNC state occur a series of changes, and bacteria can’t be tested via conventional culture metheds. It will be great significance to the work on conventional microbiology. This paper summarized the methods of Enterococcus faecalis entering in and resuming from the VBNC state. Some methods for monitoring and the biological characteristics were suggested. Related Articles | Metrics

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Research progress on T lymphocyte subsets of oral lichen planus Liu Yajing, Wang Wenmei. Inter J Stomatol. 2011, 38 (4):  433-435.  DOI: 10.3969/j.issn.1673-5749.2011.04.018 Abstract ( 1126 )   HTML ( 6 )   PDF（pc） (121KB) ( 842 )   Save Oral lichen planus（OLP） is a chronic autoimmune disease of oral mucosal accompanied with lesions of skin, gential tract, nails and hair. The histology of OLP is characterized by a dense subepithelial band-like infiltrate of T lymphocytes, disruption of the epithelial basement membrane and degeneration of basal keratinocytes. This paper reviewed the research progresses of CD4+/CD8+ T cells and OLP, memory/naive T cells and OLP, Th1, Th2, Th9, Th17 cells and OLP, regulatory T cells and OLP, etc. Related Articles | Metrics

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Research progress on ubiquitination of hypoxia inducible factor-1 Zou Haixiao, Zhao Yifang, Jia Jun. Inter J Stomatol. 2011, 38 (4):  436-438.  DOI: 10.3969/j.issn.1673-5749.2011.04.019 Abstract ( 936 )   HTML ( 2 )   PDF（pc） (149KB) ( 857 )   Save Adaptation to low oxygen tension（hypoxia） in cells and tissues induce the transcription of a series of genes that participate in angiogenesis, iron metabolism, glucose metabolism, cell proliferation, and cell survival. Hypoxia inducible factor（HIF）-1 is one of the most important transcriptional activators that mediate these responses. Furthermore, the stability of HIF is regulated by ubiquitination. This article reviews the recent research on the ubiquitination of HIF-1α. Related Articles | Metrics

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Role of cytokine to the condylar cartilage under the mechanical loading Zhao Dongqiang, Wang Dong. Inter J Stomatol. 2011, 38 (4):  440-442.  DOI: 10.3969/j.issn.1673-5749.2011.04.020 Abstract ( 991 )   HTML ( 1 )   PDF（pc） (113KB) ( 544 )   Save The mandibular condyle is an important developing site of the temporomandibular joint. The mandibular condylar cartilage tend to growth, reconstruction or degeneration under the mechanical loading. Regulation of cytokine plays an important role in this progress. This paper aims to review the significance of condylar cytokine under mechanical loading. Related Articles | Metrics

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Research progress on neutrophil extracellular traps Zhao Sainan, Li Wenqing, Hu Yan. Inter J Stomatol. 2011, 38 (4):  443-445.  DOI: 10.3969/j.issn.1673-5749.2011.04.021 Abstract ( 1436 )   HTML ( 5 )   PDF（pc） (115KB) ( 918 )   Save It is believed that neutrophils have three major strategies to resist microbian infection, including phagocytosis, degranulation, and neutrophil extracellular traps（NET） formation. The discovery of NET introduces a brand-new perspective for the researchers from which they make analysis of the mechanism of innate immune system trapping and killing microorganisms. The thesis aims to give a review of NET’s structure and formation, as well as the fuction in disease and the escape of microorganisms from NET. Related Articles | Metrics

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Research progress on endodontic application of cone beam computed tomography Zhao Nan, Chu Jinpu. Inter J Stomatol. 2011, 38 (4):  446-448.  DOI: 10.3969/j.issn.1673-5749.2011.04.022 Abstract ( 997 )   HTML ( 2 )   PDF（pc） (108KB) ( 752 )   Save Cone beam computed tomography（CBCT） was developed in the late 1990s to produce undistorted three-dimensional information of the maxillofacial skeleton. Recently, CBCT has been widely used in endodontic and has become the new focus of the clinical study. This paper will review the research progress on the applications of CBCT in the management of endodontic problems. Related Articles | Metrics

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Assessment of the remnants within the root canals after re-treatment Xu Lili, Huang Dingming. Inter J Stomatol. 2011, 38 (4):  449-451.  DOI: 10.3969/j.issn.1673-5749.2011.04.023 Abstract ( 1063 )   HTML ( 8 )   PDF（pc） (109KB) ( 777 )   Save The re-treatment of failed endodontic treatment includes complete removal of the root filling materials, shaping root canals, disinfection with medicaments and ultimately filling. The remnants within the root canal includes gutta-percha, debris and smear layer after thoroughly root canal preparation. Removing the old filling material is critical for success. The amount of the remnants indicate the ability of the re-treatment equipment. This review was to summarize the methods to evaluate the remnants. Related Articles | Metrics

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Research progress on CD44 and the metastasis of oral squamous cell carcinoma Yan Yixuan, Li Weizhong. Inter J Stomatol. 2011, 38 (4):  452-454.  DOI: 10.3969/j.issn.1673-5749.2011.04.024 Abstract ( 977 )   HTML ( 2 )   PDF（pc） (144KB) ( 769 )   Save Members of the CD44 family of transmembrane glycoproteins, in particular the expression of CD44v6 isoforms correlates with metastasis of various human cancers. There is a consecutive expression of CD44v6 isoforms in malignant tumors, including oral squamous cell carcinoma. It is very important to detect the expression of CD44v6 in cancer tissues in predicting metastasis and prognosis in patients with oral squamous cell carcinoma. In this review, we summarized the researches progress on CD44 and its relationship with metastasis of oral squamous cell carcinoma to explore its potential value in diagnosis, treatment and prognosis of oral carcinoma. Related Articles | Metrics

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Researches of oral microbiota associated with early-childhood caries Yang Xiaoqiong1, Zou Jing2. Inter J Stomatol. 2011, 38 (4):  455-459.  DOI: 10.3969/j.issn.1673-5749.2011.04.025 Abstract ( 987 )   HTML ( 3 )   PDF（pc） (172KB) ( 1141 )   Save Early childhood caries（ECC） is an extremely destructive form of caries involving maxillary primary anterior teeth. Preventing ECC is an important work on caries prevention in worldwide by the World Health Organization. Cariogenic bacteria are considered the major etiologic agent in the development of ECC. Streptococcus mutans is the important cariogenic bacteria of ECC, the recent researches are on its colonization, transmission and genotypes. Actinomyces and Lactobacillus are the dominant microorganisms in the oral cavities of children with ECC. The colonization of Candida albicans and Bifidobacterium is associated with ECC. With the development of molecular biology techniques, studies are to the plaque microflora. This review presented the recent researches on the above aspects. Related Articles | Metrics

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Periodontal ligament stem cell niche and periodontal tissue regeneration Sun Jing, Li Shu. Inter J Stomatol. 2011, 38 (4):  460-462.  DOI: 10.3969/j.issn.1673-5749.2011.04.026 Abstract ( 1118 )   HTML ( 3 )   PDF（pc） (161KB) ( 703 )   Save Periodontal ligament stem cell niche is the micro-environment surrounding of the periodontal stem cells, containing the supporting cells of stem cells, adhesion molecules and matrix composition. It is maybe more reasonable to make the periodontal stem cells and their niche to be a whole functional subject during physiologic and pathologic processes. We will review the factors that related to periodontal ligament stem cell niche especially in the process of periodontal tissue regeneration. Related Articles | Metrics

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Research progress on jaw distractors Wang Rongjie, Zeng Rongsheng. Inter J Stomatol. 2011, 38 (4):  463-466.  DOI: 10.3969/j.issn.1673-5749.2011.04.027 Abstract ( 1101 )   HTML ( 2 )   PDF（pc） (124KB) ( 888 )   Save Distraction osteogenesis has been becoming a mature technique in the maxillofacial plastic surgery, and distractor played an important role. In the present, most of the maxillofacial distractors are traditional distractors adjusted with screw. Along with the indications extending, the traditional distractors can’t meet the clinical requirements, so some new distractors are appearing now. This review aimed to introduce these distraction appliances classifiedly, which included automatic distractor, curvilinear distractor, bidirectional distractor, trifocal distractor and implanted distractor. Related Articles | Metrics

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Evaluation and research advance on quality of life in patients with oral diseases Liu Lijun, Jiang Inter J Stomatol. 2011, 38 (4):  467-469.  DOI: 10.3969/j.issn.1673-5749.2011.04.028 Abstract ( 1016 )   HTML ( 3 )   PDF（pc） (110KB) ( 1291 )   Save Assessment and evaluation of oral health-related quality of life（OHRQL） can objectively reflect the physical and psychological effect of oral diseases on patients. We reviewed current concepts of quality of life, various forms of health survey, and clinical applications. And we summarized definitions and contents of generic quality of life, OHRQL, OHRQL questionnaire and available clinical applications. Related Articles | Metrics

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Experimental research methods in fatigue failure behavior of dental all-ceramic restorations Pan Yu1, Zhao Ke1, Zhang Xinping2. Inter J Stomatol. 2011, 38 (4):  470-473.  DOI: 10.3969/j.issn.1673-5749.2011.04.029 Abstract ( 872 )   HTML ( 2 )   PDF（pc） (135KB) ( 605 )   Save In spite of the strength of dental ceramics far exceeds the occlusal stress, one severe concern for allceramic systems is their susceptibility to fatigue damage caused from long-term mastication. Mechanical simulation of a laboratory test is often used for pre-clinical investigations of dental materials and restorations, aiming at describing the fatigue behavior and predicting the catastrophic failures. This article presents a review of the experimental methods in research of dental restorations. Related Articles | Metrics

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Research progress on retrievability of cemented implant -retained restorations Zhang Li1, Zhang Jiying2, Yang Desheng3. Inter J Stomatol. 2011, 38 (4):  474-477.  DOI: 10.3969/j.issn.1673-5749.2011.04.030 Abstract ( 1049 )   HTML ( 4 )   PDF（pc） (128KB) ( 1235 )   Save Compared to screw -retained restorations, cemented implant -retained restorations have been widely used due to esthetic, comfort and passive fit. To retrieve cemented restorations from implants is not easy for subsequent maintenance and treatment of complications such as peri-implant inflammation or food impaction. It is always a hot topic of retrieval, that is, how to remove cemented implant-retained restorations conveniently without damage. Two methods of removing cemented implant restorations have been reported in the literature, including removable mechanical components and choose proper cement. This review would briefly introduce the above two methods in clinical feasibility. Related Articles | Metrics

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Host factors analysis in early failure of dental implant Shen Hui, Lai Hongchang, Zhang Zhiyong. Inter J Stomatol. 2011, 38 (4):  478-480.  DOI: 10.3969/j.issn.1673-5749.2011.04.031 Abstract ( 906 )   HTML ( 2 )   PDF（pc） (137KB) ( 1044 )   Save Nowadays, the replacement of missing teeth with endosseous implants for the rehabilitation of edentulous or partially edentulous patients has become a standard of care, and the ten-year success rate is up to 90%. However, dental implants fail occasionally. Available studies indicate that dental implants failure usually occurs in the early stage, and the risk of late failure increases for the patients with early failure. However, the impact factors on the incidence of implant early failure are not definite. A variety of factors may have a potential influence on the incidence of dental implant early failure, such as host factors, character of implants, clinicians, surgical technique and soon. Proper patient selection is a key issue in treatment planning, and analysis of host factors will guide clinical practice. This review focused on the effect of host factors on implant early failure. Related Articles | Metrics

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The classification and application of dentinal desensitizers in dental restoration Li Yaya, Liu Li. Inter J Stomatol. 2011, 38 (4):  481-484.  DOI: 10.3969/j.issn.1673-5749.2011.04.032 Abstract ( 1199 )   HTML ( 7 )   PDF（pc） (135KB) ( 1744 )   Save Vital teeth often appear sensitive after crown preparation. Clinically, it is common to use dentinal desensitizer relieving the symptoms. While some compositions in desensitizer can affect the bonding between dentin and bonding agent, they can influence the retention of the restoration to some extent. This article summarized the classification mechanisms of the desensitizer, and discussed its application in dental restoration. Related Articles | Metrics

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The application of invisible aligner technique in extraction patients Lü Yan, Yan Bin, Wang Lin. Inter J Stomatol. 2011, 38 (4):  485-487.  DOI: 10.3969/j.issn.1673-5749.2011.04.033 Abstract ( 848 )   HTML ( 5 )   PDF（pc） (133KB) ( 947 )   Save In recent years, invisible aligner technique has been paid more attention to by both orthodontists and patients with the advantages of esthetics, comfortability, convenience, etc. As it has been developing rapidly, the application of the invisible aligner technique in extraction patients is more and more mature. However, the inclination of adjacent teeth and absorption of root of teeth have been troubling orthodontists. By consulting published invisible aligner technique cases with extraction home and abroad, this article reviewed the indications, extraction closure, anchorage control, elastic traction, open bite, oral health, period of treatment, stability, etc. Related Articles | Metrics

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Application of cognitive behavioral therapy in the field of oral treatment Chen Jing, Wang Jing, Lai Wenli. Inter J Stomatol. 2011, 38 (4):  488-491.  DOI: 10.3969/j.issn.1673-5749.2011.04.034 Abstract ( 1094 )   HTML ( 7 )   PDF（pc） (131KB) ( 780 )   Save Cognitive behavioral therapy（CBT） has not only been studied the most in the number of psychological treatment methods by the way of natural sciences, but also been recognized as the most effective method for chronic pain and become one of the most influential methods of psychologically treatment. Mental problems are common in the clinical work, dentist also need to solve the problem among the psychological, biological and social for patients. Almost during 20 years, CBT are widely used in the dental treatment, including dental anxiety, root canal therapy, oral medicine, oral surgery, orthodontics and temporomandibular joint disorder, etc. This is a review about the application of CBT in dental treatment. Related Articles | Metrics

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Influence of individual oral hygiene to gingivitis during the orthodontic treatment He Yao1, Zhang Qi1, Bai Ding2. Inter J Stomatol. 2011, 38 (4):  492-495.  DOI: 10.3969/j.issn.1673-5749.2011.04.035 Abstract ( 1005 )   HTML ( 3 )   PDF（pc） (133KB) ( 963 )   Save The time for orthodontic treatment lasts about 1 to 2 years. Because of the appliances of orthodontics, the environment of microorganism changes, which makes it difficult to keep oral health perfect. Individual oral hygiene as the main clean measure, is very important in this period. With proper individual oral hygiene, one can not only keep oral health, but also prevent oral diseases like gingivitis and this will be positive to orthodontic treatment. This review will discuss the influence of individual oral hygiene including physical clean measures and chemical ones, to gingivitis during the orthodontic treatment. Related Articles | Metrics