This study aimed to compare the primary and secondary stability, measured by resonance frequency analysis (RFA), in implants of different lengths installed in areas submitted to maxillary sinus lift. Correlation between RFA and implant insertion torque was also assessed. Twenty implants of 9 and 11 mm were inserted in areas submitted to maxillary sinus lift. The insertion torque was measured by the Bien Air motor. Osstell, through RFA, determined the implant stability quotient (ISQ) 2 times: the day of implant installation (T1) and 90 days after implant installation (T2). No differences were observed in the ISQ between T1 and T2 when the 20 implants were grouped, nor when the 9 mm implants were evaluated separately. In contrast, when the 11 mm values were evaluated separately, the ISQ was significantly higher in T2 than in T1 ( P < .05). In T1, 9 mm implants had a higher ISQ than 11 mm ones ( P < .05), whereas in T2, the implants of 11 mm showed a higher ISQ than did the 9 mm implants ( P < .05). There was no difference in insertion torque between 9 and 11 mm implants ( P > .05), nor was there a correlation between ISQ and insertion torque ( P > .05). In conclusion, longer implants (11 mm) presented a significant increase in ISQ values during the healing period when installed in areas previously submitted to maxillary sinus lift. This phenomenon was not observed for shorter implants (9 mm). Finally, no correlation was observed between ISQ and insertion torque.
INTRODUCTION: Since subjects affected by periodontitis might present an enhanced expression of the vascular endothelium growth factor (VEGF) gene, the aim of this study was to evaluate if polymorphic variants of the VEGF 936C/T gene polymorphism were associated with the periodontitis. MATERIALS AND METHODS: Oral mucosa cells were collected from 43 individuals diagnosed with periodontitis stages III and IV, and from periodontally healthy subjects. Once DNA was extracted from the cells, specific primers were used for PCR testing. The amplified gene products were submitted to electrophoresis in polyacrylamide gel and the bands were evidenced with silver nitrate. Products were subsequently submitted to digestion by the Hin1II restriction enzyme. RESULTS: Although some differences were observed in the percentages of genotypes 936 C/C (stage III periodontitis – 61%; stage IV periodontitis – 8%; periodontally healthy subjects – 31%) and C/T (stage III periodontitis – 40%; stage IV periodontitis – 33%; periodontally healthy subjects – 27%) in the groups assessed, this variation was not statistically significant (p> 0.05; Fisher’s Exact Test). CONCLUSION: The results of this study indicate that VEGF 936C/T gene polymorphism was not associated with the presence or severity of periodontitis. Additional studies involving larger samples, as well as the investigation of different polymorphisms of the same gene or other genes, should be conducted in order to broaden the understanding about the role of polymorphisms in periodontal disease.
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