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Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions.
Am J Orthod Dentofacial Orthop. 2010 Jul; 138(1):16-22.AJ

Abstract

INTRODUCTION

The purpose of this study was to compare the occlusal stability of Class II malocclusion treatment with and without extraction of 2 maxillary premolars.

METHODS

A sample of 59 records from patients with complete Class II malocclusion was used. This sample was divided into 2 groups with the following characteristics: group 1, comprising 29 patients treated without extractions, and group 2, comprising 30 patients treated with extraction of 2 maxillary premolars. Dental cast measurements were obtained before and after treatment and at a minimum of 2.4 years after treatment. The pretreatment, posttreatment, and postretention occlusal statuses were evaluated with the peer assesment rating index. The occlusal indexes at the postretention stage and the posttreatment changes and percentages of posttreatment changes were compared with t tests.

RESULTS

The nonextraction and the 2 maxillary premolar extraction treatment protocols of complete Class II malocclusions had no statistically significant differences in occlusal stability.

CONCLUSIONS

Finishing Class II malocclusion treatment with the molars in a Class II relationship has similar occlusal stability as finishing with the molars in a Class I relationship.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. jansong@travelnet.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

20620829

Citation

Janson, Guilherme, et al. "Treatment Stability in Patients With Class II Malocclusion Treated With 2 Maxillary Premolar Extractions or Without Extractions." 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. 138, no. 1, 2010, pp. 16-22.
Janson G, Camardella LT, Araki JD, et al. Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions. Am J Orthod Dentofacial Orthop. 2010;138(1):16-22.
Janson, G., Camardella, L. T., Araki, J. D., de Freitas, M. R., & Pinzan, A. (2010). Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 138(1), 16-22. https://doi.org/10.1016/j.ajodo.2008.08.033
Janson G, et al. Treatment Stability in Patients With Class II Malocclusion Treated With 2 Maxillary Premolar Extractions or Without Extractions. Am J Orthod Dentofacial Orthop. 2010;138(1):16-22. PubMed PMID: 20620829.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Treatment stability in patients with Class II malocclusion treated with 2 maxillary premolar extractions or without extractions. AU - Janson,Guilherme, AU - Camardella,Leonardo Tavares, AU - Araki,Janine Della Valle, AU - de Freitas,Marcos Roberto, AU - Pinzan,Arnaldo, PY - 2008/05/01/received PY - 2008/08/01/revised PY - 2008/08/01/accepted PY - 2010/7/13/entrez PY - 2010/7/14/pubmed PY - 2010/7/24/medline SP - 16 EP - 22 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 - 138 IS - 1 N2 - INTRODUCTION: The purpose of this study was to compare the occlusal stability of Class II malocclusion treatment with and without extraction of 2 maxillary premolars. METHODS: A sample of 59 records from patients with complete Class II malocclusion was used. This sample was divided into 2 groups with the following characteristics: group 1, comprising 29 patients treated without extractions, and group 2, comprising 30 patients treated with extraction of 2 maxillary premolars. Dental cast measurements were obtained before and after treatment and at a minimum of 2.4 years after treatment. The pretreatment, posttreatment, and postretention occlusal statuses were evaluated with the peer assesment rating index. The occlusal indexes at the postretention stage and the posttreatment changes and percentages of posttreatment changes were compared with t tests. RESULTS: The nonextraction and the 2 maxillary premolar extraction treatment protocols of complete Class II malocclusions had no statistically significant differences in occlusal stability. CONCLUSIONS: Finishing Class II malocclusion treatment with the molars in a Class II relationship has similar occlusal stability as finishing with the molars in a Class I relationship. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/20620829/Treatment_stability_in_patients_with_Class_II_malocclusion_treated_with_2_maxillary_premolar_extractions_or_without_extractions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(10)00331-8 DB - PRIME DP - Unbound Medicine ER -