Document Detail

Noncompliance maxillary molar distalization with the first class appliance: a randomized controlled trial.
MedLine Citation:
PMID:  20451774     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The aim of this study was to evaluate the treatment effects of the First Class Appliance (FCA) (Leone, Firenze, Italy) used for the distalization of maxillary first molars in patients with Class II malocclusion and mixed dentition. METHODS: According to the results of the power analysis for sample size calculation, 32 consecutive patients with bilateral Class II molar relationships were initially included in the study. After application of the inclusion and exclusion criteria, 26 patients remained for the final evaluation. They were randomized into 2 groups: treatment group (n = 15) and untreated control group (n = 11). Lateral cephalograms and dental casts were obtained before and immediately after distalization for the treatment group, and initially and approximately 22 weeks later for the control group. Statistical evaluation of the variables included the mixed 2-way analysis of variance at P <0.05. The method error was also estimated. RESULTS: The mean treatment period to achieve a full Class I molar relationship was 17.2 weeks. Analysis of the data showed significant distalization of the maxillary first molars produced by the FCA (mean: 4.00 mm) when compared with the untreated group (mean: 0.95 mm). The rate of molar movement was 1.00 mm per month, which, however, was associated with distal tipping of the first molars (8.56 degrees ) and anchorage loss of the anterior dental unit in terms of overjet increase (0.68 mm), and mesial movement (1.86 mm) and inclination (1.85 degrees ) of the first premolars or first deciduous molars. The maxillary first molars also moved buccally (1.37 mm), but no significant distal rotation occurred. CONCLUSIONS: The FCA is an efficient noncompliance appliance to distalize molars in the mixed dentition without distal rotations. However, these movements are associated with distal molar tipping and anchorage loss of the anterior teeth.
Moschos A Papadopoulos; Aristides B Melkos; Athanasios E Athanasiou
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  137     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-10     Completed Date:  2010-07-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  586.e1-586.e13; discussion 586-7     Citation Subset:  D; IM    
Copyright Information:
Copyright (c) 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Associate professor and program coordinator, Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
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MeSH Terms
Bicuspid / pathology
Cephalometry / methods
Dental Models
Dentition, Mixed
Follow-Up Studies
Incisor / pathology
Malocclusion, Angle Class II / therapy*
Mandible / pathology
Maxilla / pathology
Molar / pathology*
Nose / pathology
Orthodontic Anchorage Procedures / instrumentation
Orthodontic Appliance Design*
Orthodontic Appliances* / adverse effects
Orthodontic Brackets
Orthodontic Wires
Palate / pathology
Sella Turcica / pathology
Tooth Movement / adverse effects,  instrumentation*
Treatment Outcome

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