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International Journal of Implant Dentistry

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Open Access 01-12-2016 | Technical Advances Article

Twist removal of healed vs. nonhealed implants—a mechanical and histological study in mini pigs

Authors: Ricardo de Oliveira Silva, Fabrício Passador, Paulo Henrique Ferreira Caria

Published in: International Journal of Implant Dentistry | Issue 1/2016

Abstract

Purpose

The objective of this study was to evaluate the effect of removal torque (reverse torque) of titanium implants in peri-implant bone.

Methods

The P1-M1 teeth were extracted bilaterally of 6 mini pigs (BR-1). Each animal received 6 titanium implants, three for each side of mandible. On the right side of mandible, 3 implants reminded 9 months (9M) under masticatory activity and on the left side, other 3 implants were placed and immediately removed (IR). All 36 implants were removed by removal torque, and the recorded values were statistically analyzed. Animals were euthanized right after the removal torque and recording. Each third (cervical, medium, and apical) of peri-implant bone was extracted and analyzed histological and immunohistochemically. Student’s t test was used to determine statistical differences in the values between the 9M and IR samples. Data were presented as means with standard deviations. The level of significance was set at 5% (P < 0.05).

Results

Removal torque was higher in 9M experimental situation than in IR. Histological characteristics of mature bone were presented in the 9M experimental condition, and immature bone characteristics were presented in the IR experimental condition. Removal torque caused small fractures and rounding in the bone grooving. Immunohistochemical analysis reinforced the histological results; Student’s t test provided statistically significant differences to osteocalcin expression in 9M samples and no statistically significant differences expression to collagen I in both experimental conditions (P < 0.05).

Conclusions

Removal torque caused microscopical fractures and smoothing in the peri-implant bone grooves, but it does not compromise the bone healing.

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Title: Twist removal of healed vs. nonhealed implants—a mechanical and histological study in mini pigs
Authors: Ricardo de Oliveira Silva
Fabrício Passador
Paulo Henrique Ferreira Caria
Publication date: 01-12-2016
Publisher: Springer Berlin Heidelberg
Published in: International Journal of Implant Dentistry / Issue 1/2016
Electronic ISSN: 2198-4034
DOI: https://doi.org/10.1186/s40729-016-0059-x

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Twist removal of healed vs. nonhealed implants—a mechanical and histological study in mini pigs

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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