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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Original Articles

Korean J Orthod 2006; 36(3): 171-177   

First Published Date November 30, -0001, Publication Date June 30, 2006

Copyright © The Korean Association of Orthodontists.

Comparison of histologic observation and insertional and removal torque values between titanium grade 2 and 4 microimplants

Sung-Taek Kang , Oh-Won Kwon , Jae-Hyun Sung , Hee-Moon Kyung , Hyo-Sang Park

Abstract

The purpose of this study was to evaluate the light microscopic features and the maximum insertional and removal torque value of microimplants, made from titanium grade 2 or 4, in the tibia of 6 rabbits. First, the maximum torque values of microimplants at implantation were measured. After 2, 8, and 12 weeks of healing time, the microimplant-containing segments of tibia of 2 rabbits were removed and the maximum removal torque of each microimplant were measured. Comparisons of histologic examination and insertional and removal torque values were carried out for the two groups of microimplants. Removal torque values were significantly increased in both groups after 8 and 12 weeks as compared to 2 weeks after implantation. Other values measured did not show any statistically significant differences and there were no histological differences between grade 2 and 4 titanium. Based on these results, this study showed that there were no significant differences between grade 2 and 4 titanium. It seems better to use grade 4 titanium for making microimplants because grade 4 titanium is mechanically harder than grade 2 titanium and has similar retention.

Keywords: Titanium , Microimplant , Removal torque

Article

Original Articles

Korean J Orthod 2006; 36(3): 171-177   

First Published Date November 30, -0001, Publication Date June 30, 2006

Copyright © The Korean Association of Orthodontists.

Comparison of histologic observation and insertional and removal torque values between titanium grade 2 and 4 microimplants

Sung-Taek Kang , Oh-Won Kwon , Jae-Hyun Sung , Hee-Moon Kyung , Hyo-Sang Park

Abstract

The purpose of this study was to evaluate the light microscopic features and the maximum insertional and removal torque value of microimplants, made from titanium grade 2 or 4, in the tibia of 6 rabbits. First, the maximum torque values of microimplants at implantation were measured. After 2, 8, and 12 weeks of healing time, the microimplant-containing segments of tibia of 2 rabbits were removed and the maximum removal torque of each microimplant were measured. Comparisons of histologic examination and insertional and removal torque values were carried out for the two groups of microimplants. Removal torque values were significantly increased in both groups after 8 and 12 weeks as compared to 2 weeks after implantation. Other values measured did not show any statistically significant differences and there were no histological differences between grade 2 and 4 titanium. Based on these results, this study showed that there were no significant differences between grade 2 and 4 titanium. It seems better to use grade 4 titanium for making microimplants because grade 4 titanium is mechanically harder than grade 2 titanium and has similar retention.

Keywords: Titanium , Microimplant , Removal torque