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Anterior tooth alignment and arch dimensions changes: 37-year follow-up in patients treated with and without premolar extraction.
Am J Orthod Dentofacial Orthop. 2020 Oct; 158(4):e5-e15.AJ

Abstract

INTRODUCTION

The objective of this research was to evaluate the anterior tooth alignment and dental arch dimension changes after orthodontic treatments with and without premolar extractions in the long-term.

METHODS

Fifty-seven patients with Class I and Class II malocclusion were divided into 2 groups. Group 1 included 16 patients treated with nonextraction therapy, with mean initial (T1), final (T2), and long-term follow-up (T3) ages of 13.20 years, 15.07 years, and 50.32 years, respectively. The mean treatment (T2 - T1) and long-term follow-up (T3 - T2) times were 1.86 years and 35.25 years, respectively. Group 2 included 41 patients treated with extraction of 4 first premolars, with T1, T2, and T3 ages of 13.31 years, 15.63 years, and 53.60 years, respectively. The mean treatment and long-term follow-up times were 2.32 years and 37.96 years, respectively. The mean retention time was 2.26 years for both groups. The dental casts were obtained and digitized at T1, T2, and T3 stages. The following measurements were obtained: Little irregularity index, arch length, perimeter, and intercanine, interpremolar, and intermolar widths. Intragroup and intergroup comparisons were performed with repeated measures analysis of variance and t tests, respectively.

RESULTS

Anterior tooth irregularity index increased at T3 in both groups. In addition, all arch dimensions, except the intercanine width, were significantly smaller in the extraction group at T3. Both groups showed similar arch dimension changes at T3, except for the mandibular arch perimeter. The percentage of mandibular anterior tooth alignment change was significantly greater in the nonextraction than in the extraction group.

CONCLUSIONS

There was no difference in the changes of anterior alignment and transverse arch dimensions in patients treated with and without premolar extraction at T3, but the percentage of mandibular anterior tooth alignment changes was higher in the nonextraction than in the extraction patients at T3. The mandibular arch perimeter showed more of a decrease at T3 in extraction patients.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. Electronic address: cotrin@hotmail.com.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, Inga University Center, Maringá, Paraná, Brazil.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, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil; Department of Orthodontics, Inga University Center, Maringá, Paraná, Brazil.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32843251

Citation

Cotrin, Paula, et al. "Anterior Tooth Alignment and Arch Dimensions Changes: 37-year Follow-up in Patients Treated With and Without Premolar Extraction." 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. 158, no. 4, 2020, pp. e5-e15.
Cotrin P, Gambardela-Tkacz CM, Moura W, et al. Anterior tooth alignment and arch dimensions changes: 37-year follow-up in patients treated with and without premolar extraction. Am J Orthod Dentofacial Orthop. 2020;158(4):e5-e15.
Cotrin, P., Gambardela-Tkacz, C. M., Moura, W., Iunes, A., Janson, G., Freitas, M. R., & Freitas, K. M. S. (2020). Anterior tooth alignment and arch dimensions changes: 37-year follow-up in patients treated with and without premolar extraction. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 158(4), e5-e15. https://doi.org/10.1016/j.ajodo.2020.07.013
Cotrin P, et al. Anterior Tooth Alignment and Arch Dimensions Changes: 37-year Follow-up in Patients Treated With and Without Premolar Extraction. Am J Orthod Dentofacial Orthop. 2020;158(4):e5-e15. PubMed PMID: 32843251.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Anterior tooth alignment and arch dimensions changes: 37-year follow-up in patients treated with and without premolar extraction. AU - Cotrin,Paula, AU - Gambardela-Tkacz,Caroline Martins, AU - Moura,Wilana, AU - Iunes,Augusto, AU - Janson,Guilherme, AU - Freitas,Marcos Roberto, AU - Freitas,Karina Maria Salvatore, Y1 - 2020/08/23/ PY - 2020/04/01/received PY - 2020/07/01/revised PY - 2020/07/01/accepted PY - 2020/8/28/pubmed PY - 2020/10/2/medline PY - 2020/8/27/entrez SP - e5 EP - e15 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 - 158 IS - 4 N2 - INTRODUCTION: The objective of this research was to evaluate the anterior tooth alignment and dental arch dimension changes after orthodontic treatments with and without premolar extractions in the long-term. METHODS: Fifty-seven patients with Class I and Class II malocclusion were divided into 2 groups. Group 1 included 16 patients treated with nonextraction therapy, with mean initial (T1), final (T2), and long-term follow-up (T3) ages of 13.20 years, 15.07 years, and 50.32 years, respectively. The mean treatment (T2 - T1) and long-term follow-up (T3 - T2) times were 1.86 years and 35.25 years, respectively. Group 2 included 41 patients treated with extraction of 4 first premolars, with T1, T2, and T3 ages of 13.31 years, 15.63 years, and 53.60 years, respectively. The mean treatment and long-term follow-up times were 2.32 years and 37.96 years, respectively. The mean retention time was 2.26 years for both groups. The dental casts were obtained and digitized at T1, T2, and T3 stages. The following measurements were obtained: Little irregularity index, arch length, perimeter, and intercanine, interpremolar, and intermolar widths. Intragroup and intergroup comparisons were performed with repeated measures analysis of variance and t tests, respectively. RESULTS: Anterior tooth irregularity index increased at T3 in both groups. In addition, all arch dimensions, except the intercanine width, were significantly smaller in the extraction group at T3. Both groups showed similar arch dimension changes at T3, except for the mandibular arch perimeter. The percentage of mandibular anterior tooth alignment change was significantly greater in the nonextraction than in the extraction group. CONCLUSIONS: There was no difference in the changes of anterior alignment and transverse arch dimensions in patients treated with and without premolar extraction at T3, but the percentage of mandibular anterior tooth alignment changes was higher in the nonextraction than in the extraction patients at T3. The mandibular arch perimeter showed more of a decrease at T3 in extraction patients. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/32843251/Anterior_tooth_alignment_and_arch_dimensions_changes:_37_year_follow_up_in_patients_treated_with_and_without_premolar_extraction_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(20)30457-1 DB - PRIME DP - Unbound Medicine ER -