Influencia da fumaça de cigarro sobre o reparo e a densidade ossea ao redor de implantes de titanio : estudo histometrico em ratos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This study investigated the influence of cigarette smoke on bone healing around titanium implants inserted in rats. Thirty-four Wistar rats were inc1uded in the study. After anesthesia, the tibiae surface was exposed and one screw-shaped titanium implant (4.0 mm in length - 2.2 mm in diameter) was placed bilaterally. The animals were randomly assigned to one of the following groups: Group 1 - control (n=19) and Group 2 - intermittent cigarette smoke inhalation (n=15). After sixty days, the animals were sacrificed and undecalcified sections obtained. These sections were evaluated according to the following parameters; bone density (the proportion of mineralized bone in a 500 µ-wide zone lateral to the implant) (BD), degree of bone-to-implant contact (BIC) and the bone area (BA) within the limits of the threads of the implant. All the parameters were measured in the cortical (Zone A) and chancellors bone (Zone B) areas. BD was significantly decreased in Zone B in the animals that were exposed to cigarette smoke (17.57% +- 6.45 / 11.30% +- 6.81, groups 1 and 2, respectively) (P<0.05). A slight difference in the BIC was noted between groups 1 and 2, but was not statistically significant either in Zone A or in Zone B (Mann- Whitney test - P>0.05). In contrast, the BA c1ose to the implant significantly decreased in both zones for the group-2 animals (84.73% +- 4.77 / 79.85% +- 6.17, Zone A in groups 1 and 2, respectively / 32.01% +- 6.62 / 20.71 % +- 8.57, Zone B in groups 1 and 2, respectively - P<0.05). Thus, within the limits of the present study, intermittent cigarette smoke inhalation may result in a poor bone quality around titanium implants inserted in rats

ASSUNTO(S)

ossos - regeneração implantes dentarios endoosseos periodontia rato

ACESSO AO ARTIGO

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