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Influence of cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with 2- and 4-premolar extraction protocols.
Am J Orthod Dentofacial Orthop. 2008 Jun; 133(6):861-8.AJ

Abstract

INTRODUCTION

The objectives of this investigation were to compare the initial cephalometric characteristics of complete Class II Division 1 malocclusions treated with 2 or 4 premolar extractions and to verify their influence on the occlusal success rate of these treatment protocols.

METHODS

A sample of 98 records from patients with complete Class II Division 1 malocclusion was divided into 2 groups with the following characteristics: group 1 consisted of 55 patients treated with 2 maxillary first premolar extractions at an initial mean age of 13.07 years; group 2 included 43 patients treated with 4 premolar extractions, with an initial mean age of 12.92 years. Initial and final occlusal statuses were evaluated on dental casts with Grainger's treatment priority index (TPI), and the initial cephalometric characteristics were obtained from the pretreatment cephalograms. The initial cephalometric characteristics and the initial and final occlusal statuses of the groups were compared with the t test. A multiple regression analysis was used to evaluate the influence of all variables in the final TPI.

RESULTS

The 2-premolar extraction protocol provided a statistically smaller TPI and consequently a better occlusal success rate than the 4-premolar extraction protocol. The 4-premolar extraction group had statistically smaller apical base lengths, more vertical facial growth patterns, and greater hard- and soft-tissue convexities at pretreatment than the 2-premolar extraction group. However, the multiple regression analysis showed that only the extraction protocol was significantly associated with the final occlusal status.

CONCLUSIONS

The initial cephalometric characteristics of the groups did not influence the occlusal success rate of these 2 treatment protocols.

Authors+Show Affiliations

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

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18538250

Citation

Janson, Guilherme, et al. "Influence of Cephalometric Characteristics On the Occlusal Success Rate of Class II Malocclusions Treated With 2- and 4-premolar Extraction Protocols." 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. 133, no. 6, 2008, pp. 861-8.
Janson G, Janson M, Nakamura A, et al. Influence of cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with 2- and 4-premolar extraction protocols. Am J Orthod Dentofacial Orthop. 2008;133(6):861-8.
Janson, G., Janson, M., Nakamura, A., de Freitas, M. R., Henriques, J. F., & Pinzan, A. (2008). Influence of cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with 2- and 4-premolar extraction protocols. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 133(6), 861-8. https://doi.org/10.1016/j.ajodo.2006.04.045
Janson G, et al. Influence of Cephalometric Characteristics On the Occlusal Success Rate of Class II Malocclusions Treated With 2- and 4-premolar Extraction Protocols. Am J Orthod Dentofacial Orthop. 2008;133(6):861-8. PubMed PMID: 18538250.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with 2- and 4-premolar extraction protocols. AU - Janson,Guilherme, AU - Janson,Marcos, AU - Nakamura,Alexandre, AU - de Freitas,Marcos Roberto, AU - Henriques,José Fernando Castanha, AU - Pinzan,Arnaldo, PY - 2005/11/01/received PY - 2006/04/01/revised PY - 2006/04/01/accepted PY - 2008/6/10/pubmed PY - 2008/6/24/medline PY - 2008/6/10/entrez SP - 861 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 - 133 IS - 6 N2 - INTRODUCTION: The objectives of this investigation were to compare the initial cephalometric characteristics of complete Class II Division 1 malocclusions treated with 2 or 4 premolar extractions and to verify their influence on the occlusal success rate of these treatment protocols. METHODS: A sample of 98 records from patients with complete Class II Division 1 malocclusion was divided into 2 groups with the following characteristics: group 1 consisted of 55 patients treated with 2 maxillary first premolar extractions at an initial mean age of 13.07 years; group 2 included 43 patients treated with 4 premolar extractions, with an initial mean age of 12.92 years. Initial and final occlusal statuses were evaluated on dental casts with Grainger's treatment priority index (TPI), and the initial cephalometric characteristics were obtained from the pretreatment cephalograms. The initial cephalometric characteristics and the initial and final occlusal statuses of the groups were compared with the t test. A multiple regression analysis was used to evaluate the influence of all variables in the final TPI. RESULTS: The 2-premolar extraction protocol provided a statistically smaller TPI and consequently a better occlusal success rate than the 4-premolar extraction protocol. The 4-premolar extraction group had statistically smaller apical base lengths, more vertical facial growth patterns, and greater hard- and soft-tissue convexities at pretreatment than the 2-premolar extraction group. However, the multiple regression analysis showed that only the extraction protocol was significantly associated with the final occlusal status. CONCLUSIONS: The initial cephalometric characteristics of the groups did not influence the occlusal success rate of these 2 treatment protocols. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/18538250/Influence_of_cephalometric_characteristics_on_the_occlusal_success_rate_of_Class_II_malocclusions_treated_with_2__and_4_premolar_extraction_protocols_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)01244-9 DB - PRIME DP - Unbound Medicine ER -