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15 March 2013, Volume 6 Issue 3 Previous Issue    Next Issue

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The relationship between temporomandibular joint ankylosis and condylar fractures LONG Xing 2013, 5(3): 129-132.  Abstract ( )   PDF (926KB) ( )   Abstract：Trauma is a predominant factor in TMJ ankylosis but the relationship between condylar fracture and traumatic TMJ ankylosis can not be clearly explained. Some studies demonstrate post-traumatic TMJ ankylosis arises from TMJ intra-capsular changes，including damaged cartilage， displaced or disrupted discs， haematoma formation and subsequent fibrosis and calcification in the joint. The relationship between TMJ ankylosis and condylar fracture were discussed from the clinical characteristics and animal studies.

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Prevention of traumatic temporomandibular joint ankylosis JIANG Xin，HU Kai-jin 2013, 5(3): 132-135.  Abstract ( )   PDF (870KB) ( )   Abstract： Temporomandibular joint ankylosis （TMJA） is a common disease that leads to limitation of mouth opening， masticatory difficulty and affects patient’s physical and mental health. The trauma is the most common factor. So the mechanisms and the clinical prevention of TMJA development are concerned and are always the focus of research in the field.

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Classification and treatment of temporomandibular joint ankylosis ZHOU Qing 2013, 5(3): 136-139.  Abstract ( )   PDF (1472KB) ( )   Abstract： TMJ ankylosis is severe and may be classified according to the site， type of tissue involved and the degree of fusion. The surgical treatment following the functional training is the best option for this condition. Its surgical treatment involves three aspects：to remove the anatomic factors of ankylosis，to restore or rebuilt the structure of TMJ，and to remedy secondary deformities. A number of various techniques have been described for the treatment of this condition in the literature， and some of them will be introduced below.

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Complications after treatment for the condylar fracture and analysis of their causes CAI Yi-hua， HE Dong-mei 2013, 5(3): 140-143.  Abstract ( )   PDF (866KB) ( )   Abstract：Condylar fracture is common clinically， but if it is not treated correctly，sequelae may happen afterwards. This article reviewed the complications and reasons of closed and open treatment.

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Three-dimensional finite element analysis of the different crown-root ratio of implant-borne prothesis in repairing the first molar of mandibular JIANG Lu-lu*，TANG Jia-qi，LIN Zeng，ZHANG Jiao，FENG Wei，DENG Chun-fu，SHANG De-hao，ZHANG Chong，ZHAO Bao-hong 2013, 5(3): 144-147.  Abstract ( )   PDF (1017KB) ( )   Abstract：Objective To compare the stress distribution on bone tissue around the implant denture with different crown-root ratio in repairing the first molar of mandibular. Methods Taking Dentium planting system with platform transfer structure of Korea as a reference，draw 5 groups of three-dimensional model which contains the corresponding base station，the central screw and porcelain crown with different crown-root ratio（1∶1.5，1∶1，1.5∶1，2∶1，3∶1）through 3D mapping software of PRO / E Wildfire 5.0. Take vertical and oblique loading on each model. Ansys Workbench13.0 was used to compare Von Mises stress distribution and the trend of stress changes of each model. Results With the vertical load，in any model with different crown-root ratio，the stress concentration appear in the neck，base stations，the central screw and crown of the plant，which are uniform in the overall stress distribution and few significant changes appeared in the Von Mises stress peak of the implant. With the oblique load，the maximum value of Von Mises stress increased significantly in each model，especially in the lip and cheek side of the neck of the plant，cortical bone，base stations，the central screw and crown. With the crown-root ratio increasing，the peak stress of each parts increased significantly. Conclusion The platform conversion effectively transfers the concentration area of stress in the interface between implant and bone，and reduces the absorption of alveolar bone，but it increases risk of loose and broken base stations and central screw.

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Variation analysis of miRNA expression during osteogenic differentiation of human periodontal ligament stem cells ZHANG Yan*，ZHEN Lei，GUO Jiang-li 2013, 5(3): 148-152.  Abstract ( )   PDF (1770KB) ( )   Abstract：Objective To analyze the differential expression of miRNAs in periodontal ligament stem cells （PDLSCs） and osteo-differentiated PDLSCs. Methods PDLSCs were isolated and cultivated. PDLSCs of passage 2 was plated at density of 5×103 / cm2. At 80% confluence， the medium was changed to an inducing medium. After 14 days of induction， the results were evaluated by Alizarin red S staining、ALP activity test and miRNA microarrays. Results PDLSCs were cultivated and differentiated in vitro with active function， which were manifested by Alizarin red S staining and ALP activity test. miRNA microarrays revealed that 13 miRNAs were downregulated in osteo-differentiated PDLSCs while 11 miRNAs were upregulated. Conclusions PDLSCs have the potential to differentiate into osteoblasts. miRNA may play an important role in the osteogenic differentiation of periodontal ligament stem cells.

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Pancherz analysis in evaluating the hard tissue change of Class Ⅱ1 malocclusion treated by Twin-block appliance WANG Qian*， ZUO Yan-ping， DONG Fu-sheng 2013, 5(3): 153-157.  Abstract ( )   PDF (944KB) ( )   Abstract：Objective To investigate the skeletal and dental changes produced by the Twin-block appliance excluding the influence of natural growth in order to reflect the treatment effect more objectively and accurately. Methods The study consisted of 30 children with class Ⅱ1 malocclusion and retrognathic mandible. One group （averaged 11.5 years） was treated with Twin-block appliance for an average of 14 months；the other group （averaged 11 years old） was observed for 13 months without treatment. The cephalometric data of two groups before and after treatment or control was analyzed with Pancherz statistically. Results After treatment ， the mandible unit length，the ramus height and the mandibular body length increased by 4.95 mm，4.03mm and 1.67 mm respectively，excluding the influence of natural growth. The SNB angle increased by 2.39°. The anterior facial height and posterior facial height increased obviously， but the angle of mandibular plane was stable. The upper incisor retroclined and the lower incisor proclined； overjet and molar relationship was corrected by 4.76 mm and 5.22 mm in the treatment group， of which 61% and 75% was due to dental effect， 39% and 25% due to skeletal effect. Conclusion Deep overbite， deep overjet， and molar relation can be improved greatly by the Twin-block appliance. It can promote the mandibular growth sagitally and vertically；the correction of ClassⅡ skeletal relation can be achieved.

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Study on the changes of subgingival Prevotella intermedia of dental implant within one year WANG Jue， JIAO Yan-jun， JIN En-long， YAN Liang 2013, 5(3): 158-161.  Abstract ( )   PDF (837KB) ( )   Abstract： Objective To study the changes of Prevotella intermedia Pi of the implants within one year. Methods Forty-six implants of 38 patients were collected. In the four stages of one month， 3 months， 6 months and 12 months after restoration，evaluate their Plaque Index （PLI）， Gingival Index （GI）， Gingival Bleeding Index （GBI）， Probing Depth （PD） and X-ray bone absorption. Subgingival plaque samples were cultured separately by the selective medium of Pi. Results As time went on， the value of Pi was increasing. From the 1st to the 3rd month， the value increased most obviously and by the 6th month it became stable. The value of Pi was statistically different between the 1st and the 3rd month， the 3rd month and the 6th month， and showed no statistical difference between the 6th and 12th month. PLI， GI and X-ray bone absorption were statistically different among 1st，3rd，6th and 12th month（P < 0.05）； the GBI and PD was significantly different between the 1st and the 3rd month（P＜0.05）. Other tested indexes showed no statistic difference （P > 0.05）.Conclusion Patients with implants should be guided to do cleansing and maintenance in oral cavity after 3 months of restoration， so as to prevent peri-implantitis and increase success rate of implants.

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Clinical appliance of ball-socket attachment at distal-extended tooth missing：evaluation of the effect in 18 cases WANG Wei， LI Jia-jia， HONG Yan-song， AI Hong-jun 2013, 5(3): 162-164.  Abstract ( )   PDF (1119KB) ( )   Abstract： Objective To evaluate the long-term clinical effects of ball-socket attachment in tepairing distal-extended tooth missing. Methods Ball-socket attachment retained removable partial dentures were used for 18 patients with overdenture on KennedyⅠ、Ⅱ in dentition defect . The patients were followed up from 6 months to 2 years. Results All cases were satisfied with esthetic comfort， good retention and masticatory function. Two cases were found to have gingivitis. Conclusion The ball-socket attachment technique can achieve satisfying result in the restoration of distal-extended tooth missing．

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Prevalence of deciduous tooth caries in 5-year-old children in Changyang Tujia Autonomous District of Hubei province FANG Ji-rong,CHEN Bo， ZHENG Chun-yu，LIU Jian-jun，LV Juan-juan， LU Xu-yang 2013, 5(3): 165-167.  Abstract ( )   PDF (823KB) ( )   Abstract： Objective To know about the prevalence of deciduous tooth caries in 5-year-old children in Changyang Tujia Autonomous District，and to provide evidence for taking targeted measures to further improve the caries prevention and treatment level of high-risk population of children in the region. Methods According to the third national oral health survey methods and standards， 669 5-year-old children who come from 11 Township of Changyang Tujia Autonomous District were sampled to investigate the prevalence of deciduous tooth caries in June 2012， and SPSS13 software was used for comparative analysis of survey results. Results The prevalence rate of deciduous tooth caries，DMFT and filling rate of 5-year-old children in Changyang Tujia Autonomous District was 59.3%， 2.80 and 1.07% ， respectively. There were no significant differences between the Han and Tujia， male and female children （P > 0.05），and there was significant difference between the township and County District children （P < 0.05）. Conclusion The prevalence rate of deciduous tooth caries of the the 5-year-old in Changyang Tujia Autonomous District is higher. To improve this situation， we should strengthen the oral health education and health promotion firstly. Secondly， we must take more targeted treatment and prevention technology that is suitable for the poverty minority mountainous county， and carry out comprehensive prevention and control work.

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Analysis on pathogenic bacteria of oral and maxillofacial multiple space infections： a retrospective study of 46 patients PANG Bao-xing， FENG Yuan-yong， LI Feng-mei 2013, 5(3): 168-170.  Abstract ( )   PDF (938KB) ( )   Abstract： Objective To study the pathogenic bacteria distribution of oral and maxillofacial multiple space infections in order to provide a reasonable guidance to the clinical treatment. Methods A retrospective study in 46 patients with oral and maxillofacial multiple space infections was carried out in Affiliated Hospital of Medical College， Qingdao University，between January 2008 and October 2012.The source of infections， pathogenic bacteria distribution and clinical treatment were analyzed. Results In total，50 pathogenic bacteria strains were isolated，including Gram-positive cocci（84%），Gram-negative bacilli（12%）， Gram-positive bacilli （2%） and funji（2%）.Among pathogens，the most common pathogenic bacteria strains were Staphylococcus aureus， Streptococcus constellatus ssp constellatus， F group of streptococcus， Staphylococcus epidermidis and Klebsiella pneumoniae. Conclusion Oral and maxillofacial multiple space infections are usually mixed infections；the reasonable use of antibiotics and surgical intervention are important in the control of oral and maxillofacial multiple space infections.

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Comparative study of three temporary restorative materials on crown sealing ZHAO Xu-dong，WANG Xin，ZHOU Yu-cai 2013, 5(3): 171-173.  Abstract ( )   PDF (821KB) ( )   Abstract：Objective To compare and investigate the coronal sealing effect of three temporary restorative materials. Methods Endodontic access cavities were prepared on 60 no carious and cracked intact human molars. A straight line pathway was opened for pulp. The teeth were divided into three groups randomly， filled temporarily with Clip， Cavit G and Znic Oxide-Eugenol paste （ZOE） and were stained with 2% methylene blue. 7 days and 14 days after the temporary sealing， the coronal sealing effect of the teeth was assessed respectively， which was evaluated by the maximum depth of the dye sinking. Results On the 7th day， the sealing ability of Clip and Cavit G groups is better than that of ZOE groups （P < 0.05）， while on the 14th day the Clip group has a better sealing result than the others （P < 0.05）. Conclusion Clip is an effective temporary restorative material in the root canal therapy.

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Expression and correlation of PTEN， MMP-7 and VEGF in oral squamous cell carcinoma SUN Xiao-ju，ZUO Hai-yan，XIE Hong，DENG Wei 2013, 5(3): 174-176.  Abstract ( )   PDF (1367KB) ( )   Abstract：Objective To study the expression and correlation of PTEN， MMP-7 and VEGF in oral squamous cell carcinoma. Methods The expression of PTEN， MMP-7 and VEGF in 40 cases of OSCC tissues and 40 cases of normal oral mucosa tissues were detected using immunohistochemical SP method， respectively. And the correlation among the expression of PTEN， MMP-7 and VEGF in OSCC were analyzed. Results The expression of MMP-7 and VEGF were higher in OSCC than in normal oral mucosa（ P < 0.05） .The positive rate of PTEN protein in OSCC tissues was significantly lower than it in normal oral mucosa tissues（P < 0.05）. In OSCC，the expression of PTEN was negatively correlated with the expression of MMP-7 and VEGF. Furthermore， the expression of MMP-7 was positively correlated with the expression of VEGF. Conclusion Down-regulation of PTEN expression and up-regulation of MMP-7， VEGF expression were closely related to the occurrence and development of OSCC. Measurement of the expression of PTEN，MMP-7 and VEGF may have a clinical significance in understanding malignant behavior of OSCC.

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Keywords： salivary；neoplasm；salivary duct carcinoma 2013, 5(3): 177-178.  Abstract ( )   PDF (786KB) ( )

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Research progress of oral physiological function changes after orthognathic surgery YI Xin， LI Bo 2013, 5(3): 179-182.  Abstract ( )   PDF (841KB) ( )   Abstract： Through the good cooperation with the development and maturity of orthodontics doctors and maxillofacial surgeons， orthodontics and maxillofacial surgery closely combine to form orthodontics-orthognathic surgery joint treatment for bone deformity malocclusion. Orthognathic surgery for maxillofacial and dental arch morphology improvement has been academically generally recognized，and more and more patients accept it. After orthognathic surgery， the patient's jaw bone and teeth are moving， breaking the original mouth occlusal system and rebuilding the occlusal balance. In recent years， researches on oral occlusal functional changes after orthognathic surgery have been widely concerned and there is a lot of controversy. In this paper the oral function change studies after orthognathic surgery were reviewed.

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Research progress of the soft tissue changes following skeletal crossbite surgery        DUAN Yong-hua， WANG Yu-jiang 2013, 5(3): 183-186.  Abstract ( )   PDF (855KB) ( )   Abstract： By understanding the growth and development of the facial soft tissue and analyzing the anesthetic characteristics of the beauty and the distance and angle of cephalometric，we will discuss the soft tissue＇s distribution characteristics and the movement rule between the soft tissue and the tooth and bone after treatment so that the best treatment will be chosen for the patient accordingly and the facial region will be more harmonious in function and anesthetics.

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Research progress of crown lengthening surgery and orthodontic traction in retaining residual roots MA Chun-liang，TANG Xiao-lin 2013, 5(3): 187-190.  Abstract ( )   PDF (839KB) ( )   Abstract： There are many methods to treat the residual roots which are worth of reservation， and crown lengthening surgery and orthodontic traction are widely used. This review aims to discuss the advantages and disadvantages of crown lengthening surgery and orthodontic traction technique， as well as the progress of their combination in the treatment of residual roots.