Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants.

Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants. Research Abstract Details 

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Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants. Abstract Text:

Mitsuru Motoyoshi,Tohru Yoshida,Akiko Ono,Noriyoshi Shimizu,Mitsuru Motoyoshi,Tohru Yoshida,Akiko Ono,Noriyoshi Shimizu,

PURPOSE: To examine the relationship between cortical bone thickness, inter-root distance (horizontal space), distance from alveolar crest to the bottom of maxillary sinus (vertical space) at the prepared site, and implant placement torque and the success rate of mini-implants placed for orthodontic anchorage. MATERIALS AND METHODS: After computerized tomography examination, mini-implants 1.6 mm wide and 8 mm long were placed in the posterior alveolar bone. The mini-implant was judged a success when orthodontic force could be applied for at least 6 months without pain or clinically detectable mobility. The unpaired t test was performed to examine differences between the success and failure groups. The chi-square analysis or Fisher exact probability test was used to compare the implant success according to placement torque, location, and patient gender. P values less than .05 were considered significant. RESULTS: The subjects included 4 males (11 implants) and 28 females (76 implants) who ranged in age from 14.6 to 42.8 years. The success rate of the 87 implants was 87.4%. Cortical bone thickness was significantly greater in the success group (1.42 +/- 0.59 mm vs 0.97 +/- 0.31 mm, P = .015). The success rate was significantly higher in the group with an implant placement torque of 8 to 10 Ncm (100%) as compared to implants with higher or lower placement torques. The odds ratio for failure of the mini-implant was 6.93 (P = .047) when the cortical bone thickness was less than 1.0 mm relative to 1.0 mm or more. CONCLUSION: A relationship between stability after implant placement and the width and height of the peri-implant bone was not demonstrated. The prepared site should have a cortical bone thickness of at least 1.0 mm, and the placement torque should be controlled up to 10 Ncm.

Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants. Publishing Authors By Initials

M Motoyoshi,T Yoshida,A Ono,N Shimizu,M Motoyoshi,T Yoshida,A Ono,N Shimizu,

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Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The International journal of oral & maxillofacial

VOLUME: 22

Page Numbers: 779-84

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ISSN: 0882-2786

DAY: 2

MONTH: 11

YEAR: 2007

Effect of cortical bone thickness and implant placement torque on stability of orthodontic mini-implants. Information

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LANGUAGE: eng

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AFFILIATION: Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan. motoyoshi@dent.nihon-u.ac.jp

Country: United States

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MEDLINETA: Int J Oral Maxillofac Implants

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