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Influence of the cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with nonextraction or with two maxillary premolar extraction protocols.
World J Orthod. 2010 Winter; 11(4):e63-71.WJ

Abstract

AIM

To compare the initial cephalometric characteristics of complete Class II malocclusions treated with nonextraction or with two maxillary premolar extractions and to verify their degree of influence on the occlusal success rate.

METHODS

A sample of 84 records from patients with complete Class II malocclusions was divided into two groups. Group 1 consisted of 31 patients treated with nonextraction at an initial mean age of 12.95 years, while group 2 included 53 patients treated with two maxillary premolar extractions at an initial mean age of 13.3 years. Initial and final occlusal statuses were evaluated on dental casts with Grainger's Treatment Priority Index (TPI); the initial cephalometric characteristics were obtained on the pretreatment cephalograms. The initial cephalometric characteristics of the groups were compared by t test. A multiple linear regression analysis was used to evaluate the influence of all variables in the percentage of TPI reduction.

RESULTS

The pretreatment cephalometric characteristics of the two maxillary premolar extraction cases were a greater vertical growth pattern, greater max illary and mandibular incisor protrusion, greater maxillary incisor and molar dentoalveolar heights, and greater upper and lower lip protrusion than the nonextraction group. However, the regression analysis demonstrated that only the extraction protocol was significantly associated with the occlusal success rate in the groups.

CONCLUSIONS

It was concluded that the initial cephalometric characteristics of the groups did not influence the occlusal success rate of the two treatment protocols investigated.

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
Journal Article

Language

eng

PubMed ID

21490991

Citation

Janson, Guilherme, et al. "Influence of the Cephalometric Characteristics On the Occlusal Success Rate of Class II Malocclusions Treated With Nonextraction or With Two Maxillary Premolar Extraction Protocols." World Journal of Orthodontics, vol. 11, no. 4, 2010, pp. e63-71.
Janson G, Simão TM, Barros SE, et al. Influence of the cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with nonextraction or with two maxillary premolar extraction protocols. World J Orthod. 2010;11(4):e63-71.
Janson, G., Simão, T. M., Barros, S. E., Janson, M., & de Freitas, M. R. (2010). Influence of the cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with nonextraction or with two maxillary premolar extraction protocols. World Journal of Orthodontics, 11(4), e63-71.
Janson G, et al. Influence of the Cephalometric Characteristics On the Occlusal Success Rate of Class II Malocclusions Treated With Nonextraction or With Two Maxillary Premolar Extraction Protocols. World J Orthod. 2010;11(4):e63-71. PubMed PMID: 21490991.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of the cephalometric characteristics on the occlusal success rate of Class II malocclusions treated with nonextraction or with two maxillary premolar extraction protocols. AU - Janson,Guilherme, AU - Simão,Tassiana Mesquita, AU - Barros,Sérgio Estelita, AU - Janson,Marcos, AU - de Freitas,Marcos Roberto, PY - 2011/4/15/entrez PY - 2010/1/1/pubmed PY - 2013/4/6/medline SP - e63 EP - 71 JF - World journal of orthodontics JO - World J Orthod VL - 11 IS - 4 N2 - AIM: To compare the initial cephalometric characteristics of complete Class II malocclusions treated with nonextraction or with two maxillary premolar extractions and to verify their degree of influence on the occlusal success rate. METHODS: A sample of 84 records from patients with complete Class II malocclusions was divided into two groups. Group 1 consisted of 31 patients treated with nonextraction at an initial mean age of 12.95 years, while group 2 included 53 patients treated with two maxillary premolar extractions at an initial mean age of 13.3 years. Initial and final occlusal statuses were evaluated on dental casts with Grainger's Treatment Priority Index (TPI); the initial cephalometric characteristics were obtained on the pretreatment cephalograms. The initial cephalometric characteristics of the groups were compared by t test. A multiple linear regression analysis was used to evaluate the influence of all variables in the percentage of TPI reduction. RESULTS: The pretreatment cephalometric characteristics of the two maxillary premolar extraction cases were a greater vertical growth pattern, greater max illary and mandibular incisor protrusion, greater maxillary incisor and molar dentoalveolar heights, and greater upper and lower lip protrusion than the nonextraction group. However, the regression analysis demonstrated that only the extraction protocol was significantly associated with the occlusal success rate in the groups. CONCLUSIONS: It was concluded that the initial cephalometric characteristics of the groups did not influence the occlusal success rate of the two treatment protocols investigated. SN - 1941-6741 UR - https://www.unboundmedicine.com/medline/citation/21490991/Influence_of_the_cephalometric_characteristics_on_the_occlusal_success_rate_of_Class_II_malocclusions_treated_with_nonextraction_or_with_two_maxillary_premolar_extraction_protocols_ DB - PRIME DP - Unbound Medicine ER -