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Influence of the quality of the finished occlusion on postretention occlusal relapse.
Am J Orthod Dentofacial Orthop. 2007 Oct; 132(4):428.e9-14.AJ

Abstract

INTRODUCTION

In this study, we aimed to evaluate the influence of the quality of the finished occlusion on postretention occlusal stability.

METHODS

The sample comprised 87 patients with Class I malocclusion, treated with extraction of the 4 first premolars and edgewise mechanics; they were divided into 2 groups, according to the quality of their finished occlusions. Group 1 included 44 subjects (23 boys, 21 girls) with posttreatment peer assessment rating (PAR) scores from 0 to 5. The mean pretreatment age was 13.74 years (SD 2.14). The mean treatment time was 1.92 years (SD 0.57), the mean retention time was 1.75 years (SD 0.96), and the mean time of posttreatment evaluation was 5.17 years (SD 1.82). Group 2 included 43 subjects (22 boys, 21 girls) with posttreatment PAR scores greater than 5. The mean initial age was 13.34 years (SD 1.35). The mean treatment time was 2.20 years (SD 0.66), the mean retention time was 1.77 years (SD 0.78), and the mean posttreatment evaluation was 5.47 years (SD 1.60). The PAR and the Little irregularity indexes were measured on the dental casts at pretreatment, posttreatment, and postretention. Intergroup comparisons were made with independent t tests, and the Pearson correlation coefficient was applied to the PAR score for the whole sample at the times evaluated.

RESULTS

Well-finished patients had lower posttreatment and postretention PAR scores and greater changes during the treatment and posttreatment periods than did the poorly finished patients. For the Little irregularity index, the only difference between the groups was at the posttreatment stage; group 1 had a smaller irregularity score than group 2. The correlation coefficients showed that the greater the treatment changes, the smaller the posttreatment PAR score and the greater the relapse. But the higher the posttreatment PAR score, the higher the postretention PAR score.

CONCLUSIONS

It was concluded that the greater the quality of the orthodontic finished occlusion, the greater are the treatment changes and the amount of relapse and the better is the occlusal status at the postretention stage in Class I malocclusion treated with 4 premolar extractions.

Authors+Show Affiliations

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

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

17920494

Citation

de Freitas, Karina Maria Salvatore, et al. "Influence of the Quality of the Finished Occlusion On Postretention Occlusal Relapse." 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. 428.e9-14.
de Freitas KM, Janson G, de Freitas MR, et al. Influence of the quality of the finished occlusion on postretention occlusal relapse. Am J Orthod Dentofacial Orthop. 2007;132(4):428.e9-14.
de Freitas, K. M., Janson, G., de Freitas, M. R., Pinzan, A., Henriques, J. F., & Pinzan-Vercelino, C. R. (2007). Influence of the quality of the finished occlusion on postretention occlusal relapse. 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), e9-14.
de Freitas KM, et al. Influence of the Quality of the Finished Occlusion On Postretention Occlusal Relapse. Am J Orthod Dentofacial Orthop. 2007;132(4):428.e9-14. PubMed PMID: 17920494.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of the quality of the finished occlusion on postretention occlusal relapse. AU - de Freitas,Karina Maria Salvatore, AU - Janson,Guilherme, AU - de Freitas,Marcos Roberto, AU - Pinzan,Arnaldo, AU - Henriques,José Fernando Castanha, AU - Pinzan-Vercelino,Célia Regina Maio, PY - 2006/11/20/received PY - 2007/02/15/revised PY - 2007/02/25/accepted PY - 2007/10/9/pubmed PY - 2007/10/24/medline PY - 2007/10/9/entrez SP - 428.e9 EP - 14 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 aimed to evaluate the influence of the quality of the finished occlusion on postretention occlusal stability. METHODS: The sample comprised 87 patients with Class I malocclusion, treated with extraction of the 4 first premolars and edgewise mechanics; they were divided into 2 groups, according to the quality of their finished occlusions. Group 1 included 44 subjects (23 boys, 21 girls) with posttreatment peer assessment rating (PAR) scores from 0 to 5. The mean pretreatment age was 13.74 years (SD 2.14). The mean treatment time was 1.92 years (SD 0.57), the mean retention time was 1.75 years (SD 0.96), and the mean time of posttreatment evaluation was 5.17 years (SD 1.82). Group 2 included 43 subjects (22 boys, 21 girls) with posttreatment PAR scores greater than 5. The mean initial age was 13.34 years (SD 1.35). The mean treatment time was 2.20 years (SD 0.66), the mean retention time was 1.77 years (SD 0.78), and the mean posttreatment evaluation was 5.47 years (SD 1.60). The PAR and the Little irregularity indexes were measured on the dental casts at pretreatment, posttreatment, and postretention. Intergroup comparisons were made with independent t tests, and the Pearson correlation coefficient was applied to the PAR score for the whole sample at the times evaluated. RESULTS: Well-finished patients had lower posttreatment and postretention PAR scores and greater changes during the treatment and posttreatment periods than did the poorly finished patients. For the Little irregularity index, the only difference between the groups was at the posttreatment stage; group 1 had a smaller irregularity score than group 2. The correlation coefficients showed that the greater the treatment changes, the smaller the posttreatment PAR score and the greater the relapse. But the higher the posttreatment PAR score, the higher the postretention PAR score. CONCLUSIONS: It was concluded that the greater the quality of the orthodontic finished occlusion, the greater are the treatment changes and the amount of relapse and the better is the occlusal status at the postretention stage in Class I malocclusion treated with 4 premolar extractions. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17920494/Influence_of_the_quality_of_the_finished_occlusion_on_postretention_occlusal_relapse_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)00696-8 DB - PRIME DP - Unbound Medicine ER -