Postretention changes in canine position. Results of a long-term follow-up.
The aim of the present study was to evaluate sagittal, vertical and transverse changes in canine position and a possible correlation with relapse of lower anterior crowding. From a sample with a long-term follow-up of 15.7 +/- 4.4 years after treatment, patients with a full dentition were enrolled in the study. Post-treatment and long-term follow-up casts of 117 patients were measured and statistically analyzed. A decrease in intercanine width was found between post-treatment and long-term follow-up records, with more lingual inclination of the mandibular canine axis in the transverse plane. There was a significant correlation between maxillary and mandibular canine inclination. Concomitant changes were an increase in lower anterior crowding and a decrease in mandibular intercanine width. Relapse of anterior crowding has a multifactorial etiology. The results of this study suggest a possible influence of the canines. Functional causes in particular might have a profound influence and should be considered during treatment planning.
Huck
L
L
Department of Orthodontics, University of Hamburg, Germany. huck@uke.uni-hamburg.de
Kahl-Nieke
B
B
Schwarze
C W
CW
Schüssele
B
B
D000293:Adolescent; D000328:Adult; D003481:Cuspid / Q000473:pathology*; D005500:Follow-Up Studies; D006801:Humans; D008310:Malocclusion / Q000209:etiology / Q000473:pathology / Q000628:therapy; D008334:Mandible; D003765:Models, Dental; D012008:Recurrence; D012189:Retrospective Studies; D013997:Time Factors; D014087:Tooth Movement Techniques / Q000706:statistics & numerical data