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Extraction of maxillary first permanent molars in patients with Class II Division 1 malocclusion.
Am J Orthod Dentofacial Orthop. 2007 Sep; 132(3):316-23.AJ

Abstract

INTRODUCTION

Our objectives were to assess treatment outcomes in Class II Division 1 patients who were treated orthodontically with extraction of the maxillary first permanent molars and to describe the changes in their facial profiles.

METHODS

This was a prospective, longitudinal, 1-group outcome analysis in a private practice, with outcome evaluation by independent observers at an academic clinic. One hundred consecutively treated patients were enrolled prospectively and treated by 1 orthodontist. The inclusion criteria were white, Class II Division 1, sagittal overjet of > or =4 mm, extraction of maxillary first permanent molars, no missing teeth or agenesis, maxillary third molars present, and 1-stage full fixed appliance treatment. Standardized lateral cephalometric radiographs were made before and after active treatment. Occlusal outcome was scored on dental casts by comparing pretreatment and posttreatment casts with the peer assessment rating (PAR) index. Backward regression analysis was used to explain the soft-tissue changes on the basis of dental changes and the soft-tissue characteristics.

RESULTS

The mean reduction in weighted PAR score was 89.9% (SD, 0.9). During treatment, the lower lip retruded 1.6 mm (SD, 1.7) relative to the esthetic line. The nasolabial angle became 2.1 degrees (SD, 7.0) more obtuse during treatment. Overjet reduction and initial upper lip thickness could explain 15% of the variation in upper lip position. The changes in the position of the mandibular incisor relative to the Point A-pogonion line and initial lower lip thickness could explain 23% of the variation of lower lip position.

CONCLUSIONS

Orthodontic treatment involving extraction of the maxillary first permanent molars has a good treatment outcome. Extraction of the maxillary first permanent molars has only a small effect on the soft-tissue profile.

Authors+Show Affiliations

Department of Orthodontics and Oral Biology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17826599

Citation

Stalpers, Mattijs J P., et al. "Extraction of Maxillary First Permanent Molars in Patients With Class II Division 1 Malocclusion." 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. 132, no. 3, 2007, pp. 316-23.
Stalpers MJ, Booij JW, Bronkhorst EM, et al. Extraction of maxillary first permanent molars in patients with Class II Division 1 malocclusion. Am J Orthod Dentofacial Orthop. 2007;132(3):316-23.
Stalpers, M. J., Booij, J. W., Bronkhorst, E. M., Kuijpers-Jagtman, A. M., & Katsaros, C. (2007). Extraction of maxillary first permanent molars in patients with Class II Division 1 malocclusion. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 132(3), 316-23.
Stalpers MJ, et al. Extraction of Maxillary First Permanent Molars in Patients With Class II Division 1 Malocclusion. Am J Orthod Dentofacial Orthop. 2007;132(3):316-23. PubMed PMID: 17826599.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Extraction of maxillary first permanent molars in patients with Class II Division 1 malocclusion. AU - Stalpers,Mattijs J P, AU - Booij,Johan W, AU - Bronkhorst,Ewald M, AU - Kuijpers-Jagtman,Anne Marie, AU - Katsaros,Christos, PY - 2005/06/23/received PY - 2005/12/11/revised PY - 2006/01/04/accepted PY - 2007/9/11/pubmed PY - 2007/9/26/medline PY - 2007/9/11/entrez SP - 316 EP - 23 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 - 132 IS - 3 N2 - INTRODUCTION: Our objectives were to assess treatment outcomes in Class II Division 1 patients who were treated orthodontically with extraction of the maxillary first permanent molars and to describe the changes in their facial profiles. METHODS: This was a prospective, longitudinal, 1-group outcome analysis in a private practice, with outcome evaluation by independent observers at an academic clinic. One hundred consecutively treated patients were enrolled prospectively and treated by 1 orthodontist. The inclusion criteria were white, Class II Division 1, sagittal overjet of > or =4 mm, extraction of maxillary first permanent molars, no missing teeth or agenesis, maxillary third molars present, and 1-stage full fixed appliance treatment. Standardized lateral cephalometric radiographs were made before and after active treatment. Occlusal outcome was scored on dental casts by comparing pretreatment and posttreatment casts with the peer assessment rating (PAR) index. Backward regression analysis was used to explain the soft-tissue changes on the basis of dental changes and the soft-tissue characteristics. RESULTS: The mean reduction in weighted PAR score was 89.9% (SD, 0.9). During treatment, the lower lip retruded 1.6 mm (SD, 1.7) relative to the esthetic line. The nasolabial angle became 2.1 degrees (SD, 7.0) more obtuse during treatment. Overjet reduction and initial upper lip thickness could explain 15% of the variation in upper lip position. The changes in the position of the mandibular incisor relative to the Point A-pogonion line and initial lower lip thickness could explain 23% of the variation of lower lip position. CONCLUSIONS: Orthodontic treatment involving extraction of the maxillary first permanent molars has a good treatment outcome. Extraction of the maxillary first permanent molars has only a small effect on the soft-tissue profile. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17826599/Extraction_of_maxillary_first_permanent_molars_in_patients_with_Class_II_Division_1_malocclusion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)00561-6 DB - PRIME DP - Unbound Medicine ER -