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Class II treatment efficiency in maxillary premolar extraction and nonextraction protocols.
Am J Orthod Dentofacial Orthop. 2007 Oct; 132(4):490-8.AJ

Abstract

INTRODUCTION

In this study, we compared the efficiency of nonextraction and 2-maxillary-premolar-extraction protocols in complete Class II malocclusion treatment.

METHODS

A sample of 112 records from patients with complete Class II malocclusion was divided into 2 groups with the following characteristics: group 1, comprising 43 patients treated nonextraction with an initial mean age of 12.63 years; and group 2, comprising 69 patients treated with extraction of 2 maxillary premolars with an initial mean age of 13.91 years. To compare the efficiency of each treatment protocol, the initial and final occlusal statuses were evaluated on dental casts with the peer assessment rating (PAR) index, and the treatment time of each group was calculated from the clinical charts. Treatment efficiency was calculated by the ratio between the percentage of PAR reduction and the treatment time. PAR scores, treatment times, and treatment protocols' efficiencies of the groups were compared with the t test.

RESULTS

The 2-maxillary-premolar-extraction protocol had a smaller final PAR score, a greater percentage of PAR reduction, and greater treatment efficiency than the nonextraction protocol of complete Class II malocclusion.

CONCLUSION

The 2-maxillary-premolar-extraction protocol has greater treatment efficiency than the nonextraction protocol of complete Class II malocclusion.

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 available

Pub Type(s)

Comparative Study
Evaluation Study
Journal Article

Language

eng

PubMed ID

17920502

Citation

Janson, Guilherme, et al. "Class II Treatment Efficiency in Maxillary Premolar Extraction and Nonextraction 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. 132, no. 4, 2007, pp. 490-8.
Janson G, Barros SE, de Freitas MR, et al. Class II treatment efficiency in maxillary premolar extraction and nonextraction protocols. Am J Orthod Dentofacial Orthop. 2007;132(4):490-8.
Janson, G., Barros, S. E., de Freitas, M. R., Henriques, J. F., & Pinzan, A. (2007). Class II treatment efficiency in maxillary premolar extraction and nonextraction 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, 132(4), 490-8.
Janson G, et al. Class II Treatment Efficiency in Maxillary Premolar Extraction and Nonextraction Protocols. Am J Orthod Dentofacial Orthop. 2007;132(4):490-8. PubMed PMID: 17920502.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Class II treatment efficiency in maxillary premolar extraction and nonextraction protocols. AU - Janson,Guilherme, AU - Barros,Sérgio Estelita Cavalcante, AU - de Freitas,Marcos Roberto, AU - Henriques,José Fernando Castanha, AU - Pinzan,Arnaldo, PY - 2005/01/13/received PY - 2005/10/07/revised PY - 2005/10/21/accepted PY - 2007/10/9/pubmed PY - 2007/10/24/medline PY - 2007/10/9/entrez SP - 490 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 - 4 N2 - INTRODUCTION: In this study, we compared the efficiency of nonextraction and 2-maxillary-premolar-extraction protocols in complete Class II malocclusion treatment. METHODS: A sample of 112 records from patients with complete Class II malocclusion was divided into 2 groups with the following characteristics: group 1, comprising 43 patients treated nonextraction with an initial mean age of 12.63 years; and group 2, comprising 69 patients treated with extraction of 2 maxillary premolars with an initial mean age of 13.91 years. To compare the efficiency of each treatment protocol, the initial and final occlusal statuses were evaluated on dental casts with the peer assessment rating (PAR) index, and the treatment time of each group was calculated from the clinical charts. Treatment efficiency was calculated by the ratio between the percentage of PAR reduction and the treatment time. PAR scores, treatment times, and treatment protocols' efficiencies of the groups were compared with the t test. RESULTS: The 2-maxillary-premolar-extraction protocol had a smaller final PAR score, a greater percentage of PAR reduction, and greater treatment efficiency than the nonextraction protocol of complete Class II malocclusion. CONCLUSION: The 2-maxillary-premolar-extraction protocol has greater treatment efficiency than the nonextraction protocol of complete Class II malocclusion. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17920502/Class_II_treatment_efficiency_in_maxillary_premolar_extraction_and_nonextraction_protocols_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)00689-0 DB - PRIME DP - Unbound Medicine ER -