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Prosthodontics is an important undergraduate course in stomatology. It's an unprecedented challenge for teachers to give theoretical lectures completely by online teaching methods. After several months of online teaching practice, a complete closed-loop online teaching mode of "pre-class, in-class and after-class" has been formed by using online teaching tools such as Tencent meeting, Superstar learning platform and WeChat. A comprehensive feedback and assessment mechanism has also been established. On the premise of the teaching quality, online teaching has also promoted the exploration and reform of the information-based teaching of prosthodontics course.
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Aiming at the new problems in orthodontics teaching and employment,this study aims to explore a more suitable undergraduate teaching mode of Orthodontics,and reform the teaching of Orthodontics for five-year program students in department of stomatology of Xi'an Medical University.During the teaching of Orthodontics,teachers use the aesthetic principles that students have learned to integrate into the orthodontics teaching,and guide students to analyze,understand and master orthodontic knowledge based on the principles of aesthetics.After the course,students give good feedback on the teaching reform,and their scores of basic knowledge and case analysis of Orthodontics theoretical examination have been improved.This teaching reform is very helpful for students to learn,understand and master the knowledge of orthodontics.It helps to improve classroom teaching effect,improve students' interest in learning,and adapt to the needs of discipline and industry development,so it is worth studying and promoting.
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Objective:To explore the relationship between wearing of functional appliance and systemic metabolism of PGE2 in the blood of growing rats.Methods:54 male Wistar rats aged 4-weeks were randomly divided into 3 groups(n =18):Daytime group,all-day group and control group.Self-guided functional appliance was made for mandible advancement of the rats in the 2 experimental groups.One week after appliance wearing,rats were sacrificed at the corresponding time points and blood in femoral artery was taken. PGE2 levels in the blood samples were measured,data were analysed by cosine equation.Results:Hypothesis was true in the control group(P ＜0.05),and was not true in both 2 experimental groups(P >0.05).Conclusion:PGE2 level in rat blood is circadian rhyth-mic,wearing of functional appliance made may disturb the rhythm.
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Since enrolling oral medical undergraduates, under the guiding ideology of “culti-vating applied medical personnel for grass roots”, Xi 'an Medical University has kept trying to find effective measures to strengthen tooth carving training. It has made full use of resources and advan-tages of oral professional technology, cleared the aim, significance, content and form of tooth carving training, paid attention to linking up tooth carving skill and oral clinical courses, then formed a set of distinctive tooth carving experimental teaching mode by strengthening teacher training, innovating pra-ctice teaching methods, making teaching models, carrying out opening experiment, designing com-prehensive experiment examination methods, and actively taking part in skill competitions, and so on.
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<p><b>OBJECTIVE</b>This study aims to survey the cognition and acceptance of implant dentures among Chengdu residents in 2005 and 2013 and to comparatively analyze the differences and influencing factors.</p><p><b>METHODS</b>A questionnaire was designed for this study. Its main content included basic demographics of respondents (gender, age, cultural level, and income level), cognition level of implant dentures (concept and main characteristics of implant dentures), main concern of respondents regarding implant dentures and medical institutions, and acceptance level of the price of implant dentures, among others. The sampling survey was carried out among Chengdu residents in 2005 and 2013 using the designed questionnaire. The results were then statistically analyzed.</p><p><b>RESULTS</b>Up to 908 valid questionnaires in 2005 and 905 valid questionnaires in 2013 were obtained. The level of cognition of implant dentures was higher in 2013 than in 2005, and the correlation between cognition and cultural level and that between cognition and income level were both positive. However, the correlation between cognition and age was negative. The success rate for implant dentures and medical treatment technology of medical institutions were the factors that the respondents were mainly concerned with. The main methods for disseminating information on implant dentures were the internet, television, newspapers, magazines, and introduction by friends.</p><p><b>CONCLUSION</b>With the development of the society's economy and the improvement of culture and income level of Chengdu residents, the cognition and acceptance level of implant dentures have gradualy increased. Meanwhile, health education and medical technology still need to be strengthened.</p>
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Humans , Cognition , Dentures , Longitudinal Studies , Surveys and QuestionnairesABSTRACT
<p><b>OBJECTIVE</b>To investigate the changes in the expression of phospholipase C-gamma1tyr783 (PLC-γ1tyr783) in the condylar cartilage of a young rat during functional mandibular protraction. This work also explores the function of PLC-γ1tyr783 in the rat mandibular condylar cartilage bone remodeling, which could provide experimental evidence for clinical bone ortho- pedic work.</p><p><b>METHODS</b>A total of 60 four-week-old male Sprague-Dawley (SD) rats were used in this study. The rats were divided equally and randomly into experimental group and control group. The functional appliances that were fitted to the upper incisors of the animals in the experimental group were worn 24 h a day after the rats were fed for 7 d with homemade pellet feed. The animals in the experimental group, along with their matched controls, were sacrificed after 1, 3, 7, 14, 21, and 28 d. The bilateral condylar was fixed, decalcified, dehyded, and then conventional paraffin embedded. Immunohisto- chemistry of PLC-γ1tyr783 was applied to observe its express distribution and variation.</p><p><b>RESULTS</b>The expression of PLC-γ1tyr783 decreased gradually in the control group, which showed age-related changes (P > 0.05). On the 14th day, PLC-γ1tyr783 expres- sion in the experimental group was significantly higher than that in the control group. PLC-γ1tyr783 expression began to appear statistically and significantly different between the two groups (P < 0.01).</p><p><b>CONCLUSION</b>PLC-γ1tyr783 is involved in the bone remodeling process of the rat condylar cartilage after functional mandibular-protraction.</p>
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Animals , Male , Rats , Bone Remodeling , Cartilage , Mandibular Condyle , Phospholipase C gamma , Phosphoric Diester Hydrolases , Rats, Sprague-DawleyABSTRACT
BACKGROUND:Twin block appliance has been shown to effectively promote mandibular bone growth of Class Ⅱ malocclusion patients and improve lateral appearance of mandibular retrusion.The other improvement of Twin block appliance on hard-soft tissues remains unclear.OBJECTIVE:To assess the hard-soft tissue changes following Twinblock appliance treatment.METHODS:Atotal of 48 adolescent patients,30 males and 18 females,aged 11.6 years (range 9.58-12.37) with Class Ⅱ malocclusion were selected from Department of Orthodontics,Affiliated Stomatology Hospital of Hebei Medical University.Of them,27 were treated with Twinblock appliance as the treatment group,and 21 adolescent patients without treatments were selected as the control group.Cephalonetric analysis was used to compare the changes before and after treatment.RESULTS AND CONCLUSLON:Comparative analysis showed that Twinblock could effectively adjust or improve the effect of the natural growth,reduced upper lip convexity and mentolabial furrow angle.Moreover,Twinblock inhibited facial vertical distance reduction and facial convexity increase to decrease the potential differences between maxillary and mandibular bones in sagittal plance.Results show that Twinblock could effectively improve the profile of soft-tissues of Class Ⅱ malocclusion cases,
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BACKGROUND: Twin-block appliance has been confirmed to efficiently change hard tissue and the profile of soft tissue.Whether a linear relationship exists between soft tissue and hard tissue changes remains unclear.OBJECTIVE: To evaluate the face convexity changes of soft and hard tissues after Twin-block appliance therapy and compare with controls.METHODS: Thirty-one class Ⅱ division 1 malocclusion subjects with hand-wrist radiographs in FG-G stage were selected.Among the 31 patients,17 received Twin-block appliance therapy,serving as experimental group,and the remaining 14 subjects abandoned treatment,serving as control group.Cephalometric radiographs of each included subject were taken prior to and after treatment or observation.Face convexity of soft and hard tissues,as well as the face convexity changes,was compared between the experimental and control groups.Linear regression equation was employed to analyze the linear association between soft-and hard-tissue changes.Regression equations of experimental and control groups were compared.RESULTS AND CONCLUSION: Prior to and after Twin-block appliance therapy,a significant correlation existed between the position changes of superior and inferior alveolar sockets relative to the nose and mandible,and the position changes of upper and lower lip pits relative to the nose and mandible,i.e.,there was a linear correlation between A-E change and Ss-E change,and between B-E change and Si-E change.The largest Pearson's correlation coefficient(0.839)appeared between Si-E change and B-E change,indicating the best correlativity between these two changes.Statistical analysis revealed that the linear equations of face convexity changes of soft and hard tissues after Twin-block appliance therapy were Si-E=0.745 B-E,Ss-E=0.276 A-E.These linear equations would be helpful to explain mandible growth and face convexity change after Twin-block appliance therapy and predict the prognosis of face convexity change.
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AIM:To explore the distance from the labrale superius and inferius of the soft tissue profile in early permanent dentition with normal occlusion to the esthetic line (E line) and the proportion among each section of E plane. METHODS: Thirty Han teenagers with normal occlusion including 15 males and 15 females with the average age of 11.5 years were selected from January 2000 to December 2005. They were examined cephalometrially to measure the distance between labrale superius (Ls) and E, labrale inferius (Li) and E, and the mean values and standard deviation of prenasale (Prn)-Ls/distance between Prn and pogonion (Pg') of soft tissue, Ls-Li/distance between Prn and Pg' and Li-Pg'/distance between Prn and Pg'. RESULTS: ①Distance of Ls-E and Li-E: Ls-E and Li-E of normal occlusion were (0.083 3?0.920 8) mm and (0.621 7?1.124 6) mm. ②Proportion of each segment to the distance of Prn and Pg': Prn-Ls/Prn-Pg', Ls-Li/Prn-Pg' and Li-Pg'/Prn-Pg' were 0.413 8?0.022 3, 0.200 9?0.023 1, 0.385 7?0.022 8, respectively. CONCLUSION: E plane analysis is a convenient and effective method in the diagnosis of soft tissue in clinic. The Ls and Li are exactly on the E plane in normal occlusion and the ratio of three sections is 2∶1∶2.
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Objectives:To study the soft tissue profile characteristic in the early permanent dentition with Class Ⅲ malocclusion, and then to analyze the relationship between hard and soft tissue. Methods: 50 normal occlusion and 50 Class Ⅲ malocclusion children were examined cephalometrially with the lip at rest. Results:Compared with the normal occlusion group, All measurement except 9 soft tissue variables and 1 hard tissue variables was statistically significant with t-test in the Class Ⅲ malocclusion group (P
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Objective This study simulated clinical implant surgery using squeeze technique by establishing a rational animal model.We investigated the microscope image in order to observe the agglutination of the cancellous bone after being compressed.Methods The cancellous bone in condyles of dog femur had been chosen as the experimental position,the implant holes were prepared using squeeze technique according to different compressing extent(0,0.6,1.2,2.0mm),and then the corresponding implants were inserted into them.After different healing periods(1 week,2 weeks,4 weeks,12 weeks),the mongerl dogs were sacrificed and the hard tissue slices were made,then the architecture of the cancellous bone was observed using microscope.Results The architecture of the cancellous bone was changed obviously by squeeze technique in 1 week,2 weeks and 4 weeks hard tissue slices.After being compressed,the bone trabecula around implants was compact.Conclusion The clinical implant surgery using squeeze technique helps improve peri-implant bone density,which is good for obtaining primary stabilities of implants.