Effect of different loading time on the stabililty and boné response around dental implants. Resonance frequency analysis and histomorphometric study in dogs. / Efeito de diferentes tempos de ativação sobre a estabilidade e resposta óssea ao redor de implantes dentários. Estudo por análise de freqüência de ressonância e histomorfométrico em cães

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Purpose: The aim of this study was to evaluate the implant stability through frequency resonance analysis and the effect that different loading time will have on the bone response around implants through a histomorphometric analysis. Material and Methods: Three Replace Select implants were placed on each side of the mandible in 8 dogs totaling 48 implants in the study. One pair of implants was selected for immediate loading protocol (IL). After seven days the second pair of implants received the prostheses for the early loading protocol (EL). In each period, the implant stability measurements were performed by means of resonance frequency. After 12 weeks, a new reading of the implant stability was performed. Fourteen days after the implant placement the third pair of implants received the prostheses for the advanced early loading (AEL). Following a period totaling twelve weeks of prosthetics, the animals were sacrificed and the specimens were prepared for histomorphometric analysis. The differences between loading time in the following parameters: bone-to-implant contact (BIC), bone density (BD) and crestal bone loss (CBL) were evaluated through ANOVA. Results: The mean values of initial stability (ISQ) in different loading times were 77.88 ± 4.61 (IL), 79.73 ± 3.55 (EL) and 79.64 ± 3.00 (AEL). The data were subject to ANOVA and a significant difference was not detected (p = 0.30). The mean values of final stability in different loading times were 80.46 ± 4.23 (IL), 81.88 ± 3.55 (EL) and 81.88 ± 3.42 (AEL). The data were subject to ANOVA and a significant difference was not detected (p = 0.47). To evaluate the implant stability in function of time, a variance analysis for repeated samples was performed, and there was significant difference (p = 0.003), indicating, for each group, a significant increase in stability at the end of the experiment. The time versus method interaction did not show significant difference (p = 0.97), indicating that the variations are similar in the studied groups. The percentage of BIC for IL was 77.9 ± 1.71%, for EL was 79.25 ± 2.11% and for AEL was 79.42 ± 1.49%. The percentage of BD for IL was 69.97 ± 3.81%, for EL was 69.23 ± 5.68% and for AEL was 69.19 ± 2.90%. The CBL for IL was 1.57 ± 0.22mm, for EL was 1.23 ± 0.19mm and for AEL was 1.17 ± 0.32mm. There was no statistical difference for any of the parameters evaluated (p>0.05). Conclusion: Considering primary stability, bone-to-implant contact, bone density around the implants and crestal bone loss, there are no significant differences until 12 weeks after surgery for the stability of immediate, 7 or 14 days after placement activated implants.

ASSUNTO(S)

carga imediata osseointegration early loading estabilidade primária bone-to-implant contact dental implants densidade óssea implant stability contato osso-implante carga precoce osseointegração estudos com animais animal studies bone density implantes dentários immediate loading

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