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Soft-tissue treatment changes in Class II Division 1 malocclusion with and without extraction of maxillary premolars.
Am J Orthod Dentofacial Orthop. 2007 Dec; 132(6):729.e1-8.AJ

Abstract

INTRODUCTION

In this study, we compared the soft-tissue changes and posttreatment status after nonextraction and maxillary premolar extraction treatment in patients with Class II Division 1 malocclusion.

METHODS

Lateral cephalograms of 44 patients, divided into 2 matching groups, were evaluated. Group 1 comprised 22 patients (10 boys, 12 girls) treated nonextraction with initial and final mean ages of 12.50 and 15.12 years, respectively, and a mean treatment time of 2.62 years. This group had an initial mean overjet of 7.97 mm. Group 2 consisted of 22 patients (10 boys, 12 girls) treated with extractions of 2 maxillary premolars with initial and final mean ages of 12.86 and 15.32 years, respectively. The mean treatment time was 2.46 years, and the initial mean overjet was 8.61 mm. Independent t tests were used to compare the initial and final cephalometric status and the treatment changes between the groups.

RESULTS

According to the results, only 1 soft-tissue variable showed a significant treatment change between the groups. However, at the posttreatment stage, there were no significant differences between the soft-tissue variables.

CONCLUSIONS

The protocol including extraction of 2 maxillary premolars provides similar soft-tissue results as nonextraction treatment of complete Class II malocclusion.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil. jansong@travelnet.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

18068588

Citation

Janson, Guilherme, et al. "Soft-tissue Treatment Changes in Class II Division 1 Malocclusion With and Without Extraction of Maxillary 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. 132, no. 6, 2007, pp. 729.e1-8.
Janson G, Fuziy A, de Freitas MR, et al. Soft-tissue treatment changes in Class II Division 1 malocclusion with and without extraction of maxillary premolars. Am J Orthod Dentofacial Orthop. 2007;132(6):729.e1-8.
Janson, G., Fuziy, A., de Freitas, M. R., Castanha Henriques, J. F., & de Almeida, R. R. (2007). Soft-tissue treatment changes in Class II Division 1 malocclusion with and without extraction of maxillary 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, 132(6), e1-8.
Janson G, et al. Soft-tissue Treatment Changes in Class II Division 1 Malocclusion With and Without Extraction of Maxillary Premolars. Am J Orthod Dentofacial Orthop. 2007;132(6):729.e1-8. PubMed PMID: 18068588.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Soft-tissue treatment changes in Class II Division 1 malocclusion with and without extraction of maxillary premolars. AU - Janson,Guilherme, AU - Fuziy,Acácio, AU - de Freitas,Marcos Roberto, AU - Castanha Henriques,José Fernando, AU - de Almeida,Renato Rodrigues, PY - 2006/11/24/received PY - 2007/05/01/revised PY - 2007/05/01/accepted PY - 2007/12/11/pubmed PY - 2008/1/9/medline PY - 2007/12/11/entrez SP - 729.e1 EP - 8 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 - 6 N2 - INTRODUCTION: In this study, we compared the soft-tissue changes and posttreatment status after nonextraction and maxillary premolar extraction treatment in patients with Class II Division 1 malocclusion. METHODS: Lateral cephalograms of 44 patients, divided into 2 matching groups, were evaluated. Group 1 comprised 22 patients (10 boys, 12 girls) treated nonextraction with initial and final mean ages of 12.50 and 15.12 years, respectively, and a mean treatment time of 2.62 years. This group had an initial mean overjet of 7.97 mm. Group 2 consisted of 22 patients (10 boys, 12 girls) treated with extractions of 2 maxillary premolars with initial and final mean ages of 12.86 and 15.32 years, respectively. The mean treatment time was 2.46 years, and the initial mean overjet was 8.61 mm. Independent t tests were used to compare the initial and final cephalometric status and the treatment changes between the groups. RESULTS: According to the results, only 1 soft-tissue variable showed a significant treatment change between the groups. However, at the posttreatment stage, there were no significant differences between the soft-tissue variables. CONCLUSIONS: The protocol including extraction of 2 maxillary premolars provides similar soft-tissue results as nonextraction treatment of complete Class II malocclusion. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/18068588/Soft_tissue_treatment_changes_in_Class_II_Division_1_malocclusion_with_and_without_extraction_of_maxillary_premolars_ DB - PRIME DP - Unbound Medicine ER -