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Posttreatment and physiologic occlusal changes comparison.
Angle Orthod. 2013 Mar; 83(2):239-45.AO

Abstract

OBJECTIVE

To compare posttreatment and postretention occlusal changes with the physiologic occlusal changes caused by natural development of untreated subjects.

MATERIALS AND METHODS

The sample was divided into three groups. Group 1 comprised 97 subjects treated with four premolar extractions at a mean pretreatment (T0) age of 13.03 years, a mean posttreatment (T1, first observation) age of 15.12 years, and a mean postretention (T2, second observation) age of 20.52 years. The mean observation period (T2-T1) was 5.39 years. Group 2 comprised 58 subjects treated nonextraction at a mean pretreatment age of 12.83 years, a mean posttreatment age of 14.99 years, a mean postretention age of 20.22 years, and a mean observation period of 5.22 years. Group 3 comprised 114 untreated subjects at a mean age at T1 of 14.91 years and at T2 of 20.48 years. The mean observation period was 5.56 years. Dental casts were evaluated using the Peer Assessment Rating (PAR) index and the Little irregularity index in maxillary and mandibular arches. Changes in PAR and Little indexes were compared among the three groups by analysis of variance and Tukey tests.

RESULTS

Intergroup comparison showed that at T1 and T2 the treated groups presented smaller PAR and Little indexes than the untreated group. In the observation period, the treated groups showed greater increase in PAR and Little maxillary indexes than the untreated group. The extraction group showed a greater increase of the Little mandibular index than the untreated group.

CONCLUSIONS

The treated groups showed more changes according to PAR and Little maxillary indexes than the untreated group. The posttreatment change of the mandibular anterior crowding of the treated extraction group was greater than the mandibular crowding caused by physiologic changes in the untreated group.

Authors+Show Affiliations

Department of Orthodontics, Ingá Dental School, Maringá, Paraná, Brazil. kmsf@uol.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

22799528

Citation

Freitas, Karina Maria S., et al. "Posttreatment and Physiologic Occlusal Changes Comparison." The Angle Orthodontist, vol. 83, no. 2, 2013, pp. 239-45.
Freitas KM, Janson G, Tompson B, et al. Posttreatment and physiologic occlusal changes comparison. Angle Orthod. 2013;83(2):239-45.
Freitas, K. M., Janson, G., Tompson, B., de Freitas, M. R., Simão, T. M., Valarelli, F. P., & Cançado, R. H. (2013). Posttreatment and physiologic occlusal changes comparison. The Angle Orthodontist, 83(2), 239-45. https://doi.org/10.2319/030512-181.1
Freitas KM, et al. Posttreatment and Physiologic Occlusal Changes Comparison. Angle Orthod. 2013;83(2):239-45. PubMed PMID: 22799528.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Posttreatment and physiologic occlusal changes comparison. AU - Freitas,Karina Maria S, AU - Janson,Guilherme, AU - Tompson,Bryan, AU - de Freitas,Marcos Roberto, AU - Simão,Tassiana Mesquita, AU - Valarelli,Fabrício Pinelli, AU - Cançado,Rodrigo Hermont, Y1 - 2012/07/16/ PY - 2012/7/18/entrez PY - 2012/7/18/pubmed PY - 2013/8/27/medline SP - 239 EP - 45 JF - The Angle orthodontist JO - Angle Orthod VL - 83 IS - 2 N2 - OBJECTIVE: To compare posttreatment and postretention occlusal changes with the physiologic occlusal changes caused by natural development of untreated subjects. MATERIALS AND METHODS: The sample was divided into three groups. Group 1 comprised 97 subjects treated with four premolar extractions at a mean pretreatment (T0) age of 13.03 years, a mean posttreatment (T1, first observation) age of 15.12 years, and a mean postretention (T2, second observation) age of 20.52 years. The mean observation period (T2-T1) was 5.39 years. Group 2 comprised 58 subjects treated nonextraction at a mean pretreatment age of 12.83 years, a mean posttreatment age of 14.99 years, a mean postretention age of 20.22 years, and a mean observation period of 5.22 years. Group 3 comprised 114 untreated subjects at a mean age at T1 of 14.91 years and at T2 of 20.48 years. The mean observation period was 5.56 years. Dental casts were evaluated using the Peer Assessment Rating (PAR) index and the Little irregularity index in maxillary and mandibular arches. Changes in PAR and Little indexes were compared among the three groups by analysis of variance and Tukey tests. RESULTS: Intergroup comparison showed that at T1 and T2 the treated groups presented smaller PAR and Little indexes than the untreated group. In the observation period, the treated groups showed greater increase in PAR and Little maxillary indexes than the untreated group. The extraction group showed a greater increase of the Little mandibular index than the untreated group. CONCLUSIONS: The treated groups showed more changes according to PAR and Little maxillary indexes than the untreated group. The posttreatment change of the mandibular anterior crowding of the treated extraction group was greater than the mandibular crowding caused by physiologic changes in the untreated group. SN - 1945-7103 UR - https://www.unboundmedicine.com/medline/citation/22799528/Posttreatment_and_physiologic_occlusal_changes_comparison_ L2 - https://meridian.allenpress.com/angle-orthodontist/article-lookup/doi/10.2319/030512-181.1 DB - PRIME DP - Unbound Medicine ER -