Resonance frequency analysis(RFA) has been successfully applied to measure the stability of implants, and proved to an objective method. Domestic and international scholars in the field of organ implantation have paid great attention on RFA in recent years. The present paper systematically introduces principles and applications of RFA in buccal medicine. The advantages and insufficiencies of RFA are discussed too.

Objective: To study the potential of growth and mineralization of cultured osteoblasts on the indium tin oxide conductive(ITO) glass disk coated with polypyrrole film (Ppy) . Methods: Osteoblasts were seeded onto ITO glass or ITO glass coated with polypyrrole film of implant materials. The cells were stained by HE and Von Kossa, observed by light microscope and scanning electron microscope (SEM) on day 3, 7, 14 and 28 after seeding respectively. Results: The osteoblast cells attached well to both ITO surfaces and Ppy films, mineralized nodules was observed on Ppy film. Conclusion: The polypyrrole films have good bone biocompatibility and it can be used as the biomaterials for dental implant.

Objective:Through the cases retrospective study, to analyze the correlation between the adjacent endodontic teeth and the retrograde implantitis. Methods: 32 patients were selected and there were 39 implants (ITI 28,MDIC 11), which adjacent teeth had received endodontic therapy. Record the time from endodontic therapy and the distance of the apex of implants to the adjacent tooth by X-ray photograph. Results: There were 10 implants with retrograde peri-implantitis of 39 implants. In 8 implants, their adjacent teeth received root canal therapy within 3 months(P

?Objective: To study the difference in the mobility of health teeth between Chinese young male and female. Methods: Tooth mobility (TM) of all teeth at right side was measured with FX 1 TM measuring system in 100 young males and 100 young females of Han nationality.Slope (K) value was calculated from the measurements. Results: TM values of the teeth in the females were significantly heigher than those in males ( P 0.05) Conclusion: Difference in tooth mobility exists between healthy young male and female of Chinese Han nationality.

objective: To investigate the effect of human serum albumin(HSA)on the attachment of human gingival epithelial cells(HGEs)to commercial pure titanium(cpTi).Methods: HGEs were cultured, the cells of passage 2～5 were seeded on to cpTi samples which were preincubated in keratinocyte serum free medium with 50 mg/ml HSA or without HSA. Cell attachment was studied by immunofluorescence analysis.Results: HGEs were cultured and identified by positive expression of cytokeratin. 4,12 and 24 h after seeding attached cells on HSA preincubated cpTi were 218,730 and 849, those on the control 417,745 and 864, respectively.Conclusion: The early stage of cell attachment of HGEs on to cpTi may be inhibited by HSA.

Objective: To obtaine the parameters of tooth mobil ity in people with normal health teeth . Methods:Tooth mob ility of 1 4, 1 4 in 12 subjects (7 males and 5 females, aged 21 to 23 years old) was measured by FX-1 tooth mobility measurement system 6 times a day for 5 days.The data were statisticaly analyzed. Results: The average tooth mobility parameters Q and R varied significantl y (P0.05).Conclusion: The tooth mo bility parameters of S,K,t1 and t2 can steadily reflect the changing of tooth mobility.

0.05). Conclude:The bone type may affect the stability of ITI osseointegrated implants.

Education history and characteristics of oral implantology especially in China were reviewed and commented.Curriculum establishment in China medical universities was proved to be necessary and feasible by analysis of current domestic education condition of graduate and postgraduate.education in oral implantology.In recent three years.practices in implantology education was carried out in School of Stomatology,Fourth Military Medical University.Implantology curriculum was established,with teaching experiences and methods summarized for reference of lmplantology education in other universities.

Objective To study the antidepressant effect of total timosaponin(TT)and its mechanism.Methods The antidepressant effect of TT was examined by mice forced swimming test(FST),learned helplessness(LH)experiment,chronic mild stress(CMS)model,yohimbine induced lethality test and 5-HTP induced head-twitches test.Results TT(25 or 50 mg?kg-1,ig,qd?14 d)markedly shortened the immobility time in the FST,but didn't affect the autonomic activity.TT(12.5,25 or 50 mg?kg-1,ig,qd?14 d)significantly decreased the number of escape deficits in the LH mice.TT(25 or 50 mg?kg-1,ig,qd?21 d)markedly enhanced the locomotor activity and increased consumption of sucrose solution in CMS mice.TT(50 mg?kg-1,ig,qd?14 d)enhanced the mortality of mice after administration of yohimbine for 4 h,and distinctly increased the head-twitch number in the 5-HTP induced head-twitches test.Conclusion TT has antidepressant effects in various depression mouse models.Its mechanism may be related to the reinforcement of NE and 5-HT nerves system.

Objective:To evaluate the outcome of implant-supported all-ceramic fixed partial prostheses (FPPs)in posterior area. Methods:The clinical data of 1 20 implants-supported 53 fixed dentures in 47 patients were collected from July 201 1 to June 201 2 and prospectively studied.Complication and failure of implants and /or prosthesis,biological and technical complications were evaluated. Results:43 restorations with 1 00 implants in 37 cases were followed up for 1 2 -24 months.Veneering ceramic chipping was observed in 9(20.9%)prostheses.Inflamed marginal gingivitis was found around 3(7.0%)prostheses.No implant was involved in technical complication.Cumulative survival rate was 1 00% for implant-based analysis and 1 00% for prostheses-based analysis.Conclusion:Implant-supported all-ceramic fixed partial dentures may be a feasible treatment modality for posterior dental restoration.