Effects of sucessive freezing and thawing on the mechanical properties of cortical bone / Efeitos do congelamento e descongelamento sucessivos nas propriedades mecânicas em ossos corticais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The present study was conducted to investigate the Young Module (Elasticity Module) in cortical bone samples submitted to successive freezing and thawing and then assayed in flexion tests at three points and in rupture tests according to the norms of ASTMD790M86ε1. Twenty pairs of cortical bone samples, each measuring approximately 2 x 4 x 40 mm, were collected from the same region of the caudal surface of the middle third of the diaphysis of 20 bovine tibiae and divided into two experimental groups: Group A: consisting of 20 cortical bone samples stored at – 20 Celsius degrees in plastic bags and submitted to successive freezing and thawing 50 times once a day for 50 days. These thawing episodes produced 15 flexion assays. After the 50 thawing episodes, the samples were tested until rupture. Group B: consisting of 20 cortical bone samples stored at 4 Celsius degrees in plastic bags in a refrigerator until the time when the assays of group A were concluded and then submitted to the rupture test. No statistically significant variation in the Young Module was observed after the flexion test at three points performed for Group A. The values of rupture tension also did not differ significantly between groups A and B. We observed that freezing did not cause a significant change in the mechanical properties of these bones, indicating that freezing and storage of these bones even for long periods of time does not alter their mechanical properties in flexion tests at three points or in rupture assays

ASSUNTO(S)

descongelamento congelamento cortical cortical bone bone storage estocagem osso freezing thawing

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