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Relapse of anterior crowding in patients treated with extraction and nonextraction of premolars.
Am J Orthod Dentofacial Orthop. 2006 Jun; 129(6):775-84.AJ

Abstract

INTRODUCTION

The purpose of this study was to evaluate long-term stability of incisor crowding in orthodontic patients treated with and without premolar extractions.

METHODS

Dental casts and cephalometric records of 98 patients were evaluated before treatment (T1), at posttreatment (T2), and at postretention (T3). Half of the patients had been treated with extractions, and half were treated nonextraction.

RESULTS

Irregularity, as measured by the irregularity index, decreased 5.51 mm in the extraction group and 2.38 mm in the nonextraction group. Mandibular incisor irregularity increased 0.97 mm in the extraction group and 0.99 mm in the nonextraction group, respectively, in the postretention period. Maxillary incisor irregularity relapse was smaller than mandibular incisor relapse for both groups. Intercanine width expanded during treatment. At T3, mandibular intercanine width decreased in both groups, but the differences were not statistically significant. At T3, intermolar width was stable, arch depth decreased, overbite and overjet slightly increased, SN mandibular plane angle decreased, and incisor positions in both groups tended to return to T1 values. Clinically acceptable stability was obtained.

CONCLUSIONS

With the exception of the interincisal angle, no statistically significant differences were recorded between the extraction and nonextraction groups from T2 to T3. No statistically significant correlations were found between any variables studied and mandibular incisor irregularity at T1, T2, and T3.

Authors+Show Affiliations

Department of Orthodontics, Faculty of Dentistry, University of Ege, Izmir, Turkey.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16769496

Citation

Erdinc, Aslihan Ertan, et al. "Relapse of Anterior Crowding in Patients Treated With Extraction and Nonextraction of Premolars." 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. 129, no. 6, 2006, pp. 775-84.
Erdinc AE, Nanda RS, Işiksal E. Relapse of anterior crowding in patients treated with extraction and nonextraction of premolars. Am J Orthod Dentofacial Orthop. 2006;129(6):775-84.
Erdinc, A. E., Nanda, R. S., & Işiksal, E. (2006). Relapse of anterior crowding in patients treated with extraction and nonextraction of premolars. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 129(6), 775-84.
Erdinc AE, Nanda RS, Işiksal E. Relapse of Anterior Crowding in Patients Treated With Extraction and Nonextraction of Premolars. Am J Orthod Dentofacial Orthop. 2006;129(6):775-84. PubMed PMID: 16769496.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relapse of anterior crowding in patients treated with extraction and nonextraction of premolars. AU - Erdinc,Aslihan Ertan, AU - Nanda,Ram S, AU - Işiksal,Erdal, PY - 2004/09/10/received PY - 2006/02/24/revised PY - 2006/02/24/accepted PY - 2006/6/14/pubmed PY - 2006/6/27/medline PY - 2006/6/14/entrez SP - 775 EP - 84 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 - 129 IS - 6 N2 - INTRODUCTION: The purpose of this study was to evaluate long-term stability of incisor crowding in orthodontic patients treated with and without premolar extractions. METHODS: Dental casts and cephalometric records of 98 patients were evaluated before treatment (T1), at posttreatment (T2), and at postretention (T3). Half of the patients had been treated with extractions, and half were treated nonextraction. RESULTS: Irregularity, as measured by the irregularity index, decreased 5.51 mm in the extraction group and 2.38 mm in the nonextraction group. Mandibular incisor irregularity increased 0.97 mm in the extraction group and 0.99 mm in the nonextraction group, respectively, in the postretention period. Maxillary incisor irregularity relapse was smaller than mandibular incisor relapse for both groups. Intercanine width expanded during treatment. At T3, mandibular intercanine width decreased in both groups, but the differences were not statistically significant. At T3, intermolar width was stable, arch depth decreased, overbite and overjet slightly increased, SN mandibular plane angle decreased, and incisor positions in both groups tended to return to T1 values. Clinically acceptable stability was obtained. CONCLUSIONS: With the exception of the interincisal angle, no statistically significant differences were recorded between the extraction and nonextraction groups from T2 to T3. No statistically significant correlations were found between any variables studied and mandibular incisor irregularity at T1, T2, and T3. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/16769496/Relapse_of_anterior_crowding_in_patients_treated_with_extraction_and_nonextraction_of_premolars_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(06)00259-9 DB - PRIME DP - Unbound Medicine ER -