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Noncompliance maxillary molar distalization with the first class appliance: a randomized controlled trial.
Am J Orthod Dentofacial Orthop. 2010 May; 137(5):586.e1-586.e13; discussion 586-7.AJ

Abstract

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.

Authors+Show Affiliations

Associate professor and program coordinator, Department of Orthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece. mikepap@dent.auth.grNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

20451774

Citation

Papadopoulos, Moschos A., et al. "Noncompliance Maxillary Molar Distalization With the First Class Appliance: a Randomized Controlled Trial." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 137, no. 5, 2010, pp. 586.e1-586.e13; discussion 586-7.
Papadopoulos MA, Melkos AB, Athanasiou AE. Noncompliance maxillary molar distalization with the first class appliance: a randomized controlled trial. Am J Orthod Dentofacial Orthop. 2010;137(5):586.e1-586.e13; discussion 586-7.
Papadopoulos, M. A., Melkos, A. B., & Athanasiou, A. E. (2010). Noncompliance maxillary molar distalization with the first class appliance: a randomized controlled trial. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 137(5), e1-e13; discussion 586-7. https://doi.org/10.1016/j.ajodo.2009.10.033
Papadopoulos MA, Melkos AB, Athanasiou AE. Noncompliance Maxillary Molar Distalization With the First Class Appliance: a Randomized Controlled Trial. Am J Orthod Dentofacial Orthop. 2010;137(5):586.e1-586.e13; discussion 586-7. PubMed PMID: 20451774.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Noncompliance maxillary molar distalization with the first class appliance: a randomized controlled trial. AU - Papadopoulos,Moschos A, AU - Melkos,Aristides B, AU - Athanasiou,Athanasios E, PY - 2009/07/01/received PY - 2009/10/01/revised PY - 2009/10/01/accepted PY - 2010/5/11/entrez PY - 2010/5/11/pubmed PY - 2010/7/14/medline SP - 586.e1-586.e13; discussion 586-7 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 137 IS - 5 N2 - 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. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/20451774/Noncompliance_maxillary_molar_distalization_with_the_first_class_appliance:_a_randomized_controlled_trial_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(10)00036-3 DB - PRIME DP - Unbound Medicine ER -