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Arch-width changes in extraction vs nonextraction treatments in matched Class I borderline malocclusions.
Am J Orthod Dentofacial Orthop. 2017 Apr; 151(4):735-743.AJ

Abstract

INTRODUCTION

The aims of this study were to identify a sample of borderline Class I extraction and nonextraction patients and to investigate posttreatment changes in arch-width and perimeter measurements.

METHODS

A parent sample of 580 Class I patients was subjected to discriminant analysis, and a borderline subsample of 62 patients, 31 treated with extraction of 4 first premolars and 31 treated without extractions, was obtained. The patients' plaster casts were digitally scanned, and the maxillary and mandibular intercanine and intermolar widths and perimeters were assessed.

RESULTS

The extraction group showed increases in maxillary and mandibular intercanine widths (P <0.001) and decreases in mandibular intermolar width and in maxillary and mandibular perimeters (P <0.001). The nonextraction group showed increases in all 4 arch-width measurements (P ≤0.003), whereas the maxillary and mandibular perimeters were maintained. The posttreatment differences between the 2 groups showed significant differences in the maxillary (P <0.001) and mandibular intermolar widths (P <0.001). Also, the comparison of the arch perimeters between the 2 treatment groups showed adjusted differences of -8.51 mm (P <0.001) and -8.44 mm (P <0.001) for the maxillary and mandibular arches, respectively. The intercanine widths showed no changes between the 2 treatment groups.

CONCLUSIONS

Borderline Class I patients treated with extraction of 4 first premolars had decreased maxillary and mandibular intermolar and perimeter measurements compared with nonextraction patients. The maxillary and mandibular intercanine widths showed no significant difference between the 2 treatment groups.

Authors+Show Affiliations

Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland.Department of Orthodontics, National and Kapodistrian University of Athens, Athens, Greece.Center for Advanced Dental Education, Department of Orthodontics, Saint Louis University, Saint Louis, Mo.Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland. Electronic address: theodore.eliades@zzm.uzh.ch.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

28364897

Citation

Herzog, Claudio, et al. "Arch-width Changes in Extraction Vs Nonextraction Treatments in Matched Class I Borderline Malocclusions." 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. 151, no. 4, 2017, pp. 735-743.
Herzog C, Konstantonis D, Konstantoni N, et al. Arch-width changes in extraction vs nonextraction treatments in matched Class I borderline malocclusions. Am J Orthod Dentofacial Orthop. 2017;151(4):735-743.
Herzog, C., Konstantonis, D., Konstantoni, N., & Eliades, T. (2017). Arch-width changes in extraction vs nonextraction treatments in matched Class I borderline malocclusions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 151(4), 735-743. https://doi.org/10.1016/j.ajodo.2016.10.021
Herzog C, et al. Arch-width Changes in Extraction Vs Nonextraction Treatments in Matched Class I Borderline Malocclusions. Am J Orthod Dentofacial Orthop. 2017;151(4):735-743. PubMed PMID: 28364897.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arch-width changes in extraction vs nonextraction treatments in matched Class I borderline malocclusions. AU - Herzog,Claudio, AU - Konstantonis,Dimitrios, AU - Konstantoni,Nikoleta, AU - Eliades,Theodore, PY - 2016/08/01/received PY - 2016/10/01/revised PY - 2016/10/01/accepted PY - 2017/4/3/entrez PY - 2017/4/4/pubmed PY - 2017/4/26/medline SP - 735 EP - 743 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 - 151 IS - 4 N2 - INTRODUCTION: The aims of this study were to identify a sample of borderline Class I extraction and nonextraction patients and to investigate posttreatment changes in arch-width and perimeter measurements. METHODS: A parent sample of 580 Class I patients was subjected to discriminant analysis, and a borderline subsample of 62 patients, 31 treated with extraction of 4 first premolars and 31 treated without extractions, was obtained. The patients' plaster casts were digitally scanned, and the maxillary and mandibular intercanine and intermolar widths and perimeters were assessed. RESULTS: The extraction group showed increases in maxillary and mandibular intercanine widths (P <0.001) and decreases in mandibular intermolar width and in maxillary and mandibular perimeters (P <0.001). The nonextraction group showed increases in all 4 arch-width measurements (P ≤0.003), whereas the maxillary and mandibular perimeters were maintained. The posttreatment differences between the 2 groups showed significant differences in the maxillary (P <0.001) and mandibular intermolar widths (P <0.001). Also, the comparison of the arch perimeters between the 2 treatment groups showed adjusted differences of -8.51 mm (P <0.001) and -8.44 mm (P <0.001) for the maxillary and mandibular arches, respectively. The intercanine widths showed no changes between the 2 treatment groups. CONCLUSIONS: Borderline Class I patients treated with extraction of 4 first premolars had decreased maxillary and mandibular intermolar and perimeter measurements compared with nonextraction patients. The maxillary and mandibular intercanine widths showed no significant difference between the 2 treatment groups. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/28364897/Arch_width_changes_in_extraction_vs_nonextraction_treatments_in_matched_Class_I_borderline_malocclusions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(16)30877-0 DB - PRIME DP - Unbound Medicine ER -