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Prevalence of extraction space reopening in different orthodontic treatment protocols.
Am J Orthod Dentofacial Orthop. 2017 Sep; 152(3):320-326.AJ

Abstract

INTRODUCTION

In this study, we aimed to compare the amount and frequency of extraction space reopening after 2- and 4-premolar extraction treatments in Class II and 4-premolar extractions in Class I malocclusion patients.

METHODS

The sample comprised 105 subjects with full-cusp Class II and Class I malocclusions, divided into 3 groups. Group 1 consisted of 33 full-cusp Class II malocclusion patients treated with a 2-premolar extraction protocol. Group 2 had 34 full-cusp Class II malocclusion patients treated with 4-premolar extractions, and group 3 included 38 Class I malocclusion patients treated with 4-premolar extractions. The Peer Assessment Rating index was used to assess initial malocclusion severity and quality of the occlusal outcome, measured on dental casts. The amounts of extraction spaces were measured with a digital caliper on the final and long-term posttreatment dental casts, after an average of 9.79 years posttreatment. Intergroup comparisons were performed by analysis of variance, followed by Tukey tests and chi-square tests.

RESULTS

There were no significant differences regarding the amount and frequency of extraction space reopening among the groups.

CONCLUSIONS

Two- and 4-premolar extractions in Class II and 4-premolar extraction treatment in Class I malocclusion patients show similar reopening of extraction spaces in the long term.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. Electronic address: jansong@travelnet.com.br.Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.Department of Orthodontics, Ingá Dental School, Maringá, Paraná, Brazil.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28863912

Citation

Janson, Guilherme, et al. "Prevalence of Extraction Space Reopening in Different Orthodontic Treatment Protocols." 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. 152, no. 3, 2017, pp. 320-326.
Janson G, Valarelli DP, Rizzo M, et al. Prevalence of extraction space reopening in different orthodontic treatment protocols. Am J Orthod Dentofacial Orthop. 2017;152(3):320-326.
Janson, G., Valarelli, D. P., Rizzo, M., & Valarelli, F. P. (2017). Prevalence of extraction space reopening in different orthodontic treatment protocols. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 152(3), 320-326. https://doi.org/10.1016/j.ajodo.2017.01.019
Janson G, et al. Prevalence of Extraction Space Reopening in Different Orthodontic Treatment Protocols. Am J Orthod Dentofacial Orthop. 2017;152(3):320-326. PubMed PMID: 28863912.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prevalence of extraction space reopening in different orthodontic treatment protocols. AU - Janson,Guilherme, AU - Valarelli,Danilo Pinelli, AU - Rizzo,Mayara, AU - Valarelli,Fabrício Pinelli, PY - 2016/06/01/received PY - 2017/01/01/revised PY - 2017/01/01/accepted PY - 2017/9/3/entrez PY - 2017/9/3/pubmed PY - 2017/9/16/medline SP - 320 EP - 326 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 - 152 IS - 3 N2 - INTRODUCTION: In this study, we aimed to compare the amount and frequency of extraction space reopening after 2- and 4-premolar extraction treatments in Class II and 4-premolar extractions in Class I malocclusion patients. METHODS: The sample comprised 105 subjects with full-cusp Class II and Class I malocclusions, divided into 3 groups. Group 1 consisted of 33 full-cusp Class II malocclusion patients treated with a 2-premolar extraction protocol. Group 2 had 34 full-cusp Class II malocclusion patients treated with 4-premolar extractions, and group 3 included 38 Class I malocclusion patients treated with 4-premolar extractions. The Peer Assessment Rating index was used to assess initial malocclusion severity and quality of the occlusal outcome, measured on dental casts. The amounts of extraction spaces were measured with a digital caliper on the final and long-term posttreatment dental casts, after an average of 9.79 years posttreatment. Intergroup comparisons were performed by analysis of variance, followed by Tukey tests and chi-square tests. RESULTS: There were no significant differences regarding the amount and frequency of extraction space reopening among the groups. CONCLUSIONS: Two- and 4-premolar extractions in Class II and 4-premolar extraction treatment in Class I malocclusion patients show similar reopening of extraction spaces in the long term. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/28863912/Prevalence_of_extraction_space_reopening_in_different_orthodontic_treatment_protocols_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(17)30443-2 DB - PRIME DP - Unbound Medicine ER -