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15 October 2013, Volume 6 Issue 10 Previous Issue    Next Issue

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Restoration treatment for temporomandibular joint ankylosis with secondary dentomaxillofacial deformities. LI Ji-hua 2013, 5(10): 577-583.  Abstract ( )   PDF (4691KB) ( )   Abstract：Temporomandibular joint（TMJ）ankylosis with secondary dentofacial deformities in adult patients is a severely disfiguring condition and surgical treatment for this disease remains a great clinical challenge. Treatment goals are to restore the joint function，to improve facial appearances and to correct malocclusion，as well as to re-establish harmony among them. Currently，various surgical techniques，such as arthroplasty with or without interpositional material，orthognathic surgery，distraction osteogenesis，autologous bone or bone replacement materials graft and plastic surgery，have been described in the literature. In most cases these techniques should be used in combination to achieve satisfactory outcomes.

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Muscle exercise in early treatment for malocclusion. LI Juan*，XU Huan-xi，HUANG Jin 2013, 5(10): 583-586.  Abstract ( )   PDF (957KB) ( )   Abstract：The balance and coordination of muscle system is very crucial for oral functions. The position changes of the jaw and dental arch in orthodontic treatment must be in harmony with surrounding muscles to guarantee the success of treatment and stability of the curative effects. This article is to preliminarily analyze the mechanism of how jaw deformity and malocclusion are caused by muscle dysfunction，and to summarize the examination，diagnosis，prevention and early treatments of muscle dysfunction in orthodontic treatment.

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Options of orthodontics and orthognathic treatment in dentomaxillofacial deformities. ZHANG Bi，HSU Ching-wen，DENG Feng 2013, 5(10): 587-591.  Abstract ( )   PDF (978KB) ( )   Abstract：Due to the dimensional size and direction relationship between the jaws and craniofacial，dentomaxillofacial deformities is not adjusted perfectly in serious adult patients by a single orthodontic or orthognathic treatment. The perfect way is to employ orthodontic-orthognathic cooperation treatment. The paper discussed the options of orthodontic and orthognathic surgical treatment as well as timing and combination therapy during the growth and development of dentomaxillofacial deformities.

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Micro plastic injection technology to repair maxillofacial soft tissue defect. LIU Ce-li 2013, 5(10): 592-595.  Abstract ( )   PDF (932KB) ( )   Abstract：The application of micro plastic injection technology developmed rapidly in the cosmetic surgery，and its unique advantages of small trauma and fast recovery gradually showed up in the repair of maxillofacial soft tissue defects. This paper focuses on the recent and commonly used micro plastic materials，drug and their characteristics in the micro plastic injection. Micro plastic injection technology has broad application prospects in maxillofacial soft tissue defect repair，whether used alone or as a supplement of orthognathic and orthodontic surgery.

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Expression of SHIP in oral squamous cell carcinoma. HUANG Shao-hui*，LIU Jie，LLU Fa-yu，SUN Chang-fu 2013, 5(10): 596-599.  Abstract ( )   PDF (3634KB) ( )   Abstract：Objective To study the expression of SHIP gene in oral squamous cell carcinoma（OSCC）. Methods Adjacent tissues，primary tumors and metastatic lymph nodes in 36 patients of OSCC from 2008 to 2011 at Department of Oral and Maxillofacial Surgery，School of Stomatology of China Medical University，were collected. The levels of SHIP，MMP-2 and MMP-9 expressions were examined by immunohistochemistry. Results The levels of SHIP in adjacent tissues were higher than in others（P < 0.05）. The levels of MMP-2 and MMP-9 expressions in primary tumors and metastatic lymph nodes were higher than in adjacent tissues（P < 0.01）. Conclusion SHIP gene has a negative effect on invasion and metastasis in OSCC.

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Effect of phenytoin on the proliferation of human periodontal ligament stem cells under existing lipopolysaccharide. QIU Cai-qing*，SUN Chao，WANG Bao-yan，QIU Ying-na，SUI Guo-long，LIU Li-mei，ZAI Li-ying 2013, 5(10): 600-603.  Abstract ( )   PDF (1223KB) ( )   Abstract：Objective To evaluate the effects of phenytoin（PHT）on proliferation of human periodontal ligament stem cells（hPDLSCs）under existing lipopolysaccharide（LPS）. Methods MTT method was used to observe the proliferation of hPDLSCs cultured in vitro under the action of 20 μg/mL PHT+100 ng/mL LPS，5 μg/mL PHT+100 ng/mL LPS，20 μg/mL PHT and 5 μg/mL PHT，respectively. Results Both 20 μg/mL and 5 μg/mL PHT could enhance the proliferation of hPDLSCs，and furthermore the effect of 20 μg/mL PHT was stronger. The enhancing effects of 20 μg/mL and 5 μg/mL PHT on the proliferation of hPDLSCs remained no change when 100 ng/mL LPS was added. Conclusion PHT at low concentration can enhance the proliferation of hPDLSCs；a small amount of LPS does not affect biological effect of PHT in enhancing the proliferation of hPDLSCs.

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Oral health survey on graduating senior high school students in Shannan Prefecture of Tibet. HOU Rui*，WU Fang，XIAO Gao，YANG Wen-bing，WEI Yin-hua 2013, 5(10): 604-607.  Abstract ( )   PDF (935KB) ( )   Abstract：Objective To investigate oral health status of graduating senior high school students of Zang nationality in Shannan Prefecture of Tibet，and to provide basis for prevention of local oral diseases. Methods Based on 3rd national oral health survey project and WHO methodology of oral health survey，totally 1907 students were checked on caries，periodontitis，dental fluorosis，and oral hygiene status. With questionnaire the students' oral health practice，present situation of oral medical service，and need of oral health service were investigated. Results It showed that mean DMFT was 0.97 and caries prevalence rate was 39.96% in students of Zang nationality. In community periodontal index，the detection rates of gingivitis and dental calculus were 59.50% and 62.64%. Oral hygiene index-simplified was 0.69，with 0.36 and 0.33 in debris index-simplified and calculus index-simplified. Community dental fluorosis index was 0.29，with 8.13% in prevalence rate. The questionnaire showed that students had poor oral health practice and lower needs for oral health service. The local area had also poor oral medical service. Conclusion Students of Zang nationality in plateau areas have higher prevalence of oral diseases and lower oral health perception. Oral health education and local dentists training should be strengthened and improved so as to get effective prevention for oral diseases.

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Application of gingival retraction cord to the restoration of subgingival wedge-shaped defect. ZHAO Jing，GE Jiu-yu 2013, 5(10): 608-610.  Abstract ( )   PDF (971KB) ( )   Abstract：Objective To study the clinical performance of gingival retraction cord in repairing subgingival wedge-shaped defects. Methods Totally 40 patients with wedge-shaped defect on both side premolars were selected，one side treated by gingival retraction and filled with composite resin and the other side filled directly with Z350 composite resin. The marginal adaptation，retention and the presence of secondary carries after one year and two years were evaluated. Results One week after restoration，the incidence of overhanging for dental restoration by using retraction cord to retract gingival was significantly lower than those of the control group（P < 0.05）. After 1 year and 2 years，the retention of restorations in the control group was significantly lower than that of using retraction cord（P < 0.05）. Conclusion Gingival retraction cord has high success rate for restoration of subgingival wedge-shaped defect.

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Comparison study of atraumatic and traditional extraction for impacted mandibular third molar. LENG Ying，WU Qi，DUAN Chang-hua，MO Zhen-fei 2013, 5(10): 611-613.  Abstract ( )   PDF (973KB) ( )   Abstract：Objective To research the healing of impacted mandibular third molar through atraumatic extraction so as to further verify the advantages of atraumatic extraction. Methods Totally 100 cases of male patients with median-leaning forward impacted mandibular third molar from September 2010 to October 2012 in Chancheng District Xiangyang Hospital of Foshan were selected as experiment group and control group at random. Each group had 50 cases. For the experiment group，we adopted atraumatic extraction. For the control group，we used traditional extraction. Then we compared the differences in postoperative edema，pain and limited mouth opening of two groups，and observed two groups density curve of the alveolar bone in the healing process. Results For the experiment group，postoperative edema and pain rates were lower than the control group （P < 0.05），the value of density change of alveolar bone was significantly higher than the control group after 4，8，12 weeks（P < 0.01）. The differences between two groups had statistical significance. The limited mouth opening rates in two groups had no statistical significance（P > 0.05）. Conclusion Atraumatic extraction is good for the healing of tooth socket，which is worthy of clinical popularization and application.

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Effect of different dentin adhesive on the microleakage of Ceramage polymerization porcelain inlay. ZHANG Lei*，CAO Qi 2013, 5(10): 614-617.  Abstract ( )   PDF (909KB) ( )   Abstract：Objective To compare the effect of 4 kinds of dentin adhesive on the microleakage of Ceramage polymerization porcelain inlay and provide the reference for the clinical choice of adhesive. Methods Totally 40 premolar teeth were collected，which developed normally and had no caries but should be extracted because of orthodontic. The teeth were randomly divided into 4 groups，each group 10. Class Ⅱhole was made in 40 teeth and resin inlays were made with Ceramage polymerization porcelain. Respectively，each group were coated with dentin adhesive--Prime & Bond coated NT（NT），Adper Single Bond 2（SB2），Clearfil SE Bond（SE），Clearfil S3 Bond（S3）. Rely X ARC resin was used to cohere inlays. All the test-pieces，after 500 thermal cycles and fuchsin staining，were longitudinally split 2 times with emery sheets，measuring depth of dye penetration into shaft wall and gingival wall under optical microscope. Results Shaft walls： microleakage variance were statistically significant in the 4 groups（F = 8.3125，P < 0.01）. The microleakage level in group S3 was significantly higher than in group SB（q = 6.4032），group SE（q = 5.7708）and group NT（q = 4.0316） （P < 0.01），but no significant difference among the other three groups. Gingival walls：no statistically significant differences were shown in different adhesive microleakage（F = 0.5897，P > 0.05）；for the same adhesive，gingival microleakage degree was significantly higher than shaft wall（P < 0.01）. Conclusion Clearfil S3 Bond on the sealing effect of enamel is poor. Evaluated from the microleakage depth size and operation method，Clearfil SE Bond is an ideal dentin adhesive for resin inlay.

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Relationship between concentration of lysozyme in saliva and dental caries in college students. GAO Jing，ZHANG Ling. 2013, 5(10): 618-620.  Abstract ( )   PDF (885KB) ( )   Abstract：Objective To explore the relationship between concentration of lysozyme in saliva and dental caries in college students in order to provide basis for its prevention. Methods Totally 65 healthy subjects from China Medical University （33 female and 32 male） were randomly selected and participated in this study. Twenty-three high caries college students（DMFT ≥ 5），twenty low caries college students（DMFT = 1-4）and twenty-two no caries college students（DMFT = 0）were sampled. Salivary lysozyme was measured by ELISA Kit for the quantitative analysis of human lysozyme. Results The rate of success for collecting unstimulated whole saliva in high caries group（65.2%） was lower than that in no caries group（90.9%），but there was no statistical difference （P < 0.05）；The concentration of lysozyme in no caries group ［（10.15 ± 2.60）μg/mL］ was higher than that in high caries group ［（8.52 ± 2.03）μg/mL］（P < 0.05）. However，no significant gender difference was found in no caries group and low caries group and high caries group（P > 0.05）. Conclusion Saliva lysozmye is related to college students' caries.

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Study on the clinical effect of pit and fissure sealant with different clinical acid etching technique. HUANG Nuo-bei，LIU Li-jun，CHEN Zhi-bin，ZHOU Zi-liang 2013, 5(10): 621-623.  Abstract ( )   PDF (907KB) ( )   Abstract：Objective To observe the clinical effect of pit and fissure sealant with different clinical acid etching technique. Methods Totally 240 permanent first molars in children aged 6-8 years old were randomly divided into three groups. Group A：self-etching adhesive；Group B：EST with self-etching adhesive；Group C：phosphoric acid. All the children were followed up and reexamined after 3，6 and 12 months. Results The retention rates of pit and fissure sealant and the prevalence rates of caries in three groups had no significant difference after 3 and 6 months（P > 0.05）. At 12th month，the retention rate of pit and fissure sealant in self-etching adhesive group was statistically lower than than in the other groups（P < 0.05），and the prevalence rate of caries was statistically higher than that in the others（P < 0.05）. But the other two groups had no significant difference in the retention rate of pit and fissure sealant and the prevalence rate of caries（P > 0.05）. Conclusion The clinical effect of pit and fissure sealant with self-etching adhesive is worse than with phosphoric acid，but it can be improved by combining enameloplasty sealant technique. The effect of phosphoric acid and EST combination self-etching adhesive are the same.

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Research progress of theaflavins on prevention and treatment of oral disease. HUANG Shi-yan*，CHENG Yuan，ZHAO Lei 2013, 5(10): 624-628.  Abstract ( )   PDF (952KB) ( )   Abstract：Theaflavins（TFs）is a group of polyphenol pigments which include multiple hydroxyl or phenolic hydroxyl. TFs exhibits numerous health-related bene?cial effects，such as antibacterial，antiviral，antioxidant and free radical-scavenging activity. Thus TFs may have a potential application prospect in oral disease including caries，periodontitis，oral mucosal disease and oral cancer. This review describes the recent research progress of theaflavins on prevention and treatment of oral disease.

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Research progress of the biological action of zinc on osteoblasts. SHANG Ya-wei，ZHAO Bao-hong 2013, 5(10): 629-633.  Abstract ( )   PDF (970KB) ( )   Abstract：Zinc is an important trace element that is indispensable for the process of bone metabolism. The right amount of zinc plays an important role in osteoblast physiological processes such as proliferation，differentiation，and apoptosis. This paper reviewed research status of effect and action mechanism of zinc in biological research of osteoblast.

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Application of cone-beam computed tomography to orthodontic diagnosis and treatment. LIU Meng-meng*，LIU Lin 2013, 5(10): 634-638.  Abstract ( )   PDF (945KB) ( )   Abstract：Oral imaging is an important basis for the diagnosis of orthodontics. The clinical appliancation of cone beam computed tomography（CBCT）makes orthodontic diagnosis develop from two-dimension to three-dimension age，which is very important to treatment plan，prediction and effect evaluation.