Effect of early treatment on stability of occlusion in patients with Class II malocclusion

Introduction: The purpose of this study was to evaluate the effect of early treatment on the stability of occlusion in patients with Class II malocclusions. The peer assessment rating (PAR) index was used to evaluate changes in occlusion after treatment of subjects treated in 1 phase or 2 phases. Th...

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Published in:American journal of orthodontics and dentofacial orthopedics 2008-02, Vol.133 (2), p.235-244
Main Authors: Pavlow, Sarah S, McGorray, Susan P, Taylor, Marie G, Dolce, Calogero, King, Gregory J, Wheeler, Timothy T
Format: Article
Language:English
Subjects:
Activator Appliances
Biological and medical sciences
Cephalometry
Child
Dentistry
Extraoral Traction Appliances
Facial bones, jaws, teeth, parodontium: diseases, semeiology
Female
Humans
Linear Models
Male
Malocclusion, Angle Class II - therapy
Medical sciences
Non tumoral diseases
Orthodontic Appliances, Functional
Orthodontics, Interceptive - instrumentation
Orthodontics, Interceptive - methods
Otorhinolaryngology. Stomatology
Peer Review, Health Care
Prospective Studies
Secondary Prevention
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Summary:Introduction: The purpose of this study was to evaluate the effect of early treatment on the stability of occlusion in patients with Class II malocclusions. The peer assessment rating (PAR) index was used to evaluate changes in occlusion after treatment of subjects treated in 1 phase or 2 phases. This study was a prospective, randomized, controlled clinical trial. Methods: Dental casts were obtained from the participants, who were randomized into 3 phase-1 early treatment groups: bionator, headgear/bite plane, or observation. Phase 2 consisted of continued treatment of the bionator and the headgear/biteplane subjects and comprehensive treatment of the observation subjects. PAR scores were obtained for 208 subjects at end of treatment; 173 (83%) had at least 1 follow-up visit, with a median follow-up time of 5.0 years. PAR scores were calculated for each subject at key treatment and posttreatment time points. Linear mixed-effect models were used to evaluate the impact of phase-1 treatment group, years posttreatment, end of treatment PAR score, and other covariates that could affect stability on the posttreatment PAR score. Results: Factors significantly affecting posttreatment PAR scores were PAR score at end of treatment ( P
ISSN:0889-5406
1097-6752
DOI:10.1016/j.ajodo.2006.02.038