Application of orthodontic mini-implants in adolescents

Abstract 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,...

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Bibliographic Details
Published in:International journal of oral and maxillofacial surgery 2007-08, Vol.36 (8), p.695-699
Main Authors: Motoyoshi, M, Matsuoka, M, Shimizu, N
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age Factors
anchorage
Biological and medical sciences
Chi-Square Distribution
Child
cutting torque
Dental Implantation, Endosseous - instrumentation
Dental Implantation, Endosseous - methods
Dentistry
Female
Humans
Male
Medical sciences
Orthodontic Anchorage Procedures - instrumentation
Orthodontic Anchorage Procedures - methods
orthodontics
Otorhinolaryngology. Stomatology
screw
Stress, Mechanical
Surgery
survival rate
Time Factors
Torque
Treatment Outcome
Weight-Bearing
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Summary:Abstract 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 5–10 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.
ISSN:0901-5027
1399-0020
DOI:10.1016/j.ijom.2007.03.009