Abstract
To evaluate the inflammatory response of rabbit bone after insertion of titanium screws under different torque values. Four holes were made in the back tibia of fifteen New Zealand male albino rabbits; three screws were placed in each animal and a control hole remained without a screw. The screws were inserted with 0, 5 or 10 N.cm of torque. The animals were assigned to five groups according to the day of sacrifice after surgery (2, 7, 14, 21 or 42 days). The inflammatory cells and the thickness of the bone tissue around the screws was count. The screws were associated with a larger number of inflammatory cells when compared to the control hole. There was no statistically significant difference when several comparisons were made among the groups with different torque intensity. The histological changes were not statistically significant. There was a trend toward an increase in inflammatory cells found in local bone tissue surrounding the titanium screws installed with the highest torque. There was a tendency toward the formation of a lower thickness of tissue surrounding those bone screws that were inserted with higher torque.
Highlights
RESUMO Objetivo: Avaliar em variados períodos de tempo a resposta inflamatória do tecido ósseo de coelhos nos quais foram instalados parafusos de titânio com variadas intensidades de torque
Excessive manual force was found to be responsible for too much tension on the bone, which caused an absorbent response, which means that screw insertion with higher torque values may create harmful forces on the implant
We found a larger ICN in this group on days 7, 14, 21, and 42 compared to those values in the 0 N.cm and 10 N.cm groups, but this was not statistically significant
Summary
RESUMO Objetivo: Avaliar em variados períodos de tempo a resposta inflamatória do tecido ósseo de coelhos nos quais foram instalados parafusos de titânio com variadas intensidades de torque. Conclusões: Quanto maiores foram os torques de instalação dos parafusos de titânio, maiores foram as quantidades de células inflamatórias locais observadas nos tecidos ósseos circundantes e que com o passar dos períodos de tempo, foram diminuindo gradativamente. Several mechanical factors interfere with treatment outcome One of these is the screw insertion torque value used on the tissue. Excessive manual force was found to be responsible for too much tension on the bone, which caused an absorbent response, which means that screw insertion with higher torque values may create harmful forces on the implant. The objective of this study was to histomorphometrically evaluate bone tissue repair in rabbits after different periods following titanium screw insertion under different torque values
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