[Influence of smoking on survival rate of endosseous implant: a meta analysis].

PURPOSE: To evaluate the influence of smoking on survival rate of endosseous implant. METHODS: The literatures published before the year 2012 involving influence of smoking on survival rate of endosseous implant were searched in PubMed,Embase and Cochrane databases. Data from the literatures conforming to the inclusion criteria and exclusive criteria were selected and a meta-analysis was carried out. RESULTS: Sixteen literatures conforming to the inclusion criteria and exclusive criteria were screened out, which were prospective or retrospective cohort studies. Meta analysis using random effects model showed smoking patients had higher risk to lose endosseous implants than non-smoking patients (synthesized OR 2.24,95% CI 1.66-3.01,P<0.01), which implied the survival rate of endosseous implant in smoking patients was lower than in non-smoking patients. Heterogeneity source was not figured out by meta regression and subgroup analysis. When sensitivity analysis was done by using fixed and random effects model alternatively or excluding articles in which the distribution of implant surface characteristics were uneven between smoking and non-smoking group, result was not changed obviously. CONCLUSIONS: The existing limited evidences show that smoking is harmful to the survival of endosseous implants. This meta-analysis is restricted by the literatures' quality and quantity and the results need to be confirmed by high quality studies.

[Shear bond strength of anterior teeth fragment reattachment using two different adhesive materials].

OBJECTIVE: To compare the shear bond strength of the fractured anterior teeth reattached by two different adhesive materials. METHODS: Forty crown fractured anterior modes were divided into two groups randomly, with 20 in each group. Group A were reattached by Clearfil SE Bond and Clearfil AP-X, while group B were reattached by Clearfil S3 Bond and Clearfil AP-X. Then the specimens were submitted to an axial compression test in a universal testing machine until tooth fractured. The strength was recorded. RESULTS: The mean shear bond strength of group A and group B was (324.32 +/- 65.91) N and (263.08 +/- 55.88) N, separately. The mean shear bond strength of group A was statistically higher than group B(t = 3.17, P = 0.000). CONCLUSION: The shear bond strength of two-step adhesive Clearfil SE Bond is higher than one-step adhesive Clearfil S3 Bond for the reattachment of fractured anterior teeth.