Postorthodontic root approximation after opening space for maxillary lateral incisor implants

Introduction Orthodontic space opening during adolescence is a common treatment for congenitally missing maxillary lateral incisors. Because of continued facial growth and compensatory tooth eruption, several years can elapse between completion of orthodontic treatment for a teenage patient and impl...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 2010-02, Vol.137 (2), p.158.e1-158.e8
Main Authors: Olsen, Taylor M, Kokich, Vincent G
Format: Article
Language:English
Subjects:
Adolescent
Adult
Anodontia - therapy
Contraindications
Cuspid - diagnostic imaging
Cuspid - growth & development
Dental Implantation, Endosseous - methods
Dental Implants, Single-Tooth
Dentistry
Humans
Incisor - abnormalities
Male
Maxilla
Middle Aged
Radiography
Retrospective Studies
Tooth Eruption
Tooth Migration - prevention & control
Tooth Movement Techniques - standards
Tooth Root - anatomy & histology
Tooth Root - diagnostic imaging
Young Adult
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Summary:Introduction Orthodontic space opening during adolescence is a common treatment for congenitally missing maxillary lateral incisors. Because of continued facial growth and compensatory tooth eruption, several years can elapse between completion of orthodontic treatment for a teenage patient and implant placement. There are reports that, after successful orthodontic opening of the implant space, the central incisor and canine roots reapproximate during retention and prevent implant placement. Methods To study this phenomenon, the records of 94 patients with missing maxillary lateral incisors were collected. Periapical and panoramic radiographs were used to measure intercoronal and interradicular distances between the central incisor and the canine adjacent to the missing lateral incisor before and after orthodontic treatment and at implant placement. Results Although root approximation between the adjacent central incisor and canine during retention did not occur consistently, 11% of the patients experienced relapse significant enough to prevent implant placement. Conclusions To ensure sufficient space for implant placement, we recommend at least 6.3 mm of intercoronal space and 5.7 mm of interradicular space between the adjacent central incisor and canine. A bonded wire or resin-bonded bridge will help to reduce root approximation that might occur during retention.
ISSN:0889-5406
1097-6752
DOI:10.1016/j.ajodo.2009.08.024