Application of orthodontic mini-implants in adolescents - Corrective Dentistry (Orthodontics) Articles

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Application of orthodontic mini-implants in adolescents
International Journal of Oral and Maxillofacial Surgery
Volume 36, Issue 8, August 2007, Pages 695-699

M. Motoyoshi, 1, M. Matsuoka, 2, and N. Shimizu, 1
1 - Department of Orthodontics, Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
2 - Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan
Accepted 19 March 2007. Available online 21 May 2007.

The aim of this study was to determine the success rate of mini-implants in adolescents, and also whether a latent period is necessary and the optimum placement torque in an attempt to improve the success rate in adolescent patients. There were 57 orthodontic patients involved in the study, with ages ranging from 11.7 to 36.1 years, who underwent surgery to insert mini-implants (169 implants). When a mini-implant endured an orthodontic force applied for 6 months or more without any mobility, it was considered a success. The success rate was 63.8% in the early-load group (less than 1-month latent period) of adolescents, 97.2% in the late-load group (3-month latent period) of adolescents and 91.9% in the adult group. The success rate of the early-load group of adolescents was significantly inferior to those of the other groups (P < 0.01). In measurements of the placement torque in adolescents, the success rate of the 5Ò10 N cm group was significantly higher than the other groups only in the maxilla of the early-load group. Although the optimum torque could not be defined, a latent period of 3 months before loading is recommended to improve the success rate of the mini-implant when placed in the alveolar bone in adolescent patients.

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