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Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions.
Prog Orthod. 2014 Dec 30; 15:67.PO

Abstract

BACKGROUND

The purpose of this study was to compare the occlusal stability of class II subdivision malocclusion treatment with 3 and 4 first premolar extractions. A sample of 156 dental casts from 52 patients with class II subdivision malocclusion was divided into two groups according to the extraction protocol. Group 1 comprised 24 patients treated with 3 premolar extractions and group 2 included 28 patients treated with 4 premolar extractions.

METHODS

Peer assessment rating (PAR) indexes were measured on the dental casts obtained before (T1) and after treatment (T2) and at a mean of 6.9 years after the end of treatment (T3). The groups were matching regarding sex distribution, pretreatment, posttreatment and long-term posttreatment ages, and treatment and long-term posttreatment times. They were also comparable concerning the initial malocclusion severity and the occlusal results at the end of treatment. Stability evaluation was calculated by subtracting the posttreatment from the long-term posttreatment index values (T3 - T2). T tests were used to compare the amount and percentage of long-term posttreatment changes.

RESULTS

There were no intergroup differences regarding the amount and percentage of long-term posttreatment changes.

CONCLUSION

Treatment of class II subdivision malocclusion with 3 and 4 premolar extractions have a similar long-term posttreatment occlusal stability.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru 17012-901, São Paulo , Brazil. jansong@travelnet.com.br.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

25547371

Citation

Janson, Guilherme, et al. "Stability of Class II Subdivision Malocclusion Treatment With 3 and 4 Premolar Extractions." Progress in Orthodontics, vol. 15, 2014, p. 67.
Janson G, Araki J, Estelita S, et al. Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions. Prog Orthod. 2014;15:67.
Janson, G., Araki, J., Estelita, S., & Camardella, L. T. (2014). Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions. Progress in Orthodontics, 15, 67. https://doi.org/10.1186/s40510-014-0067-4
Janson G, et al. Stability of Class II Subdivision Malocclusion Treatment With 3 and 4 Premolar Extractions. Prog Orthod. 2014 Dec 30;15:67. PubMed PMID: 25547371.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions. AU - Janson,Guilherme, AU - Araki,Janine, AU - Estelita,Sérgio, AU - Camardella,Leonardo T, Y1 - 2014/12/30/ PY - 2014/09/29/received PY - 2014/11/25/accepted PY - 2014/12/31/entrez PY - 2014/12/31/pubmed PY - 2015/7/15/medline SP - 67 EP - 67 JF - Progress in orthodontics JO - Prog Orthod VL - 15 N2 - BACKGROUND: The purpose of this study was to compare the occlusal stability of class II subdivision malocclusion treatment with 3 and 4 first premolar extractions. A sample of 156 dental casts from 52 patients with class II subdivision malocclusion was divided into two groups according to the extraction protocol. Group 1 comprised 24 patients treated with 3 premolar extractions and group 2 included 28 patients treated with 4 premolar extractions. METHODS: Peer assessment rating (PAR) indexes were measured on the dental casts obtained before (T1) and after treatment (T2) and at a mean of 6.9 years after the end of treatment (T3). The groups were matching regarding sex distribution, pretreatment, posttreatment and long-term posttreatment ages, and treatment and long-term posttreatment times. They were also comparable concerning the initial malocclusion severity and the occlusal results at the end of treatment. Stability evaluation was calculated by subtracting the posttreatment from the long-term posttreatment index values (T3 - T2). T tests were used to compare the amount and percentage of long-term posttreatment changes. RESULTS: There were no intergroup differences regarding the amount and percentage of long-term posttreatment changes. CONCLUSION: Treatment of class II subdivision malocclusion with 3 and 4 premolar extractions have a similar long-term posttreatment occlusal stability. SN - 2196-1042 UR - https://www.unboundmedicine.com/medline/citation/25547371/Stability_of_class_II_subdivision_malocclusion_treatment_with_3_and_4_premolar_extractions_ L2 - https://dx.doi.org/10.1186/s40510-014-0067-4 DB - PRIME DP - Unbound Medicine ER -