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Treatment times of Class II malocclusion: four premolar and non-extraction protocols.
Eur J Orthod. 2012 Apr; 34(2):182-7.EJ

Abstract

The purpose of this study was to retrospectively compare the treatment times of Class II division 1 malocclusion subjects treated with four first premolar extractions or a non-extraction protocol and fixed edgewise appliances. Eighty-four patients were selected and divided into two groups. Group 1, treated with four first premolar extractions, consisted of 48 patients (27 males and 21 females) with a mean age of 13.03 years and group 2, treated without extractions, consisted of 36 patients (18 males and 18 females) with a mean age of 13.13 years. Group 2 was subdivided into two subgroups, 2A consisting of 16 patients treated in one phase and 2B consisting of 20 patients treated in two phases. The initial and final Treatment Priority Index (TPI), initial ages, initial mandibular crowding, and treatment times of groups 1 and 2 were compared with t-tests. These variables were also compared between group 1 and the subgroups with analysis of variance followed by Tukey's tests. The treatment times for groups 1 and 2 and subgroups 2A and 2B were 2.36, 2.47, 2.25, and 2.64 years, respectively, which were not significantly different. Treatment times with non-extraction and four premolar extraction protocols are similar.

Authors+Show Affiliations

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

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21393372

Citation

Janson, Guilherme, et al. "Treatment Times of Class II Malocclusion: Four Premolar and Non-extraction Protocols." European Journal of Orthodontics, vol. 34, no. 2, 2012, pp. 182-7.
Janson G, Valarelli DP, Valarelli FP, et al. Treatment times of Class II malocclusion: four premolar and non-extraction protocols. Eur J Orthod. 2012;34(2):182-7.
Janson, G., Valarelli, D. P., Valarelli, F. P., & de Freitas, M. R. (2012). Treatment times of Class II malocclusion: four premolar and non-extraction protocols. European Journal of Orthodontics, 34(2), 182-7. https://doi.org/10.1093/ejo/cjq182
Janson G, et al. Treatment Times of Class II Malocclusion: Four Premolar and Non-extraction Protocols. Eur J Orthod. 2012;34(2):182-7. PubMed PMID: 21393372.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Treatment times of Class II malocclusion: four premolar and non-extraction protocols. AU - Janson,Guilherme, AU - Valarelli,Danilo Pinelli, AU - Valarelli,Fabrício Pinelli, AU - de Freitas,Marcos Roberto, Y1 - 2011/03/10/ PY - 2011/3/12/entrez PY - 2011/3/12/pubmed PY - 2012/9/26/medline SP - 182 EP - 7 JF - European journal of orthodontics JO - Eur J Orthod VL - 34 IS - 2 N2 - The purpose of this study was to retrospectively compare the treatment times of Class II division 1 malocclusion subjects treated with four first premolar extractions or a non-extraction protocol and fixed edgewise appliances. Eighty-four patients were selected and divided into two groups. Group 1, treated with four first premolar extractions, consisted of 48 patients (27 males and 21 females) with a mean age of 13.03 years and group 2, treated without extractions, consisted of 36 patients (18 males and 18 females) with a mean age of 13.13 years. Group 2 was subdivided into two subgroups, 2A consisting of 16 patients treated in one phase and 2B consisting of 20 patients treated in two phases. The initial and final Treatment Priority Index (TPI), initial ages, initial mandibular crowding, and treatment times of groups 1 and 2 were compared with t-tests. These variables were also compared between group 1 and the subgroups with analysis of variance followed by Tukey's tests. The treatment times for groups 1 and 2 and subgroups 2A and 2B were 2.36, 2.47, 2.25, and 2.64 years, respectively, which were not significantly different. Treatment times with non-extraction and four premolar extraction protocols are similar. SN - 1460-2210 UR - https://www.unboundmedicine.com/medline/citation/21393372/Treatment_times_of_Class_II_malocclusion:_four_premolar_and_non_extraction_protocols_ L2 - https://academic.oup.com/ejo/article-lookup/doi/10.1093/ejo/cjq182 DB - PRIME DP - Unbound Medicine ER -