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Comparison of peer assessment ratings (PAR) from 1-phase and 2-phase treatment protocols for Class II malocclusions.
Am J Orthod Dentofacial Orthop. 2003 May; 123(5):489-96.AJ

Abstract

The purpose of this study was to compare the dentoalveolar outcomes after 1-phase and 2-phase orthodontic treatment of Class II malocclusions. Class II subjects (n = 208) were randomized to 1-phase or 2-phase treatment with either bionator or headgear/biteplate. The peer assessment rating (PAR) was calculated from pretreatment, prephase 2, and final study models. Chi-square, Kruskal-Wallis, and Wilcoxon rank sum tests were used to evaluate the differences among treatment groups, sexes, races, pretreatment, mandibular plane angle, severity, and compliance. Spearman rank correlation coefficients were used to examine relationships between PAR at different times. The dropout rate of 24.6% did not adversely affect the ability to detect differences of clinical importance or impact treatment groups disproportionately. There were no significant differences with respect to initial PAR or final PAR among the 3 treatment protocols. The 2 early treatment groups had lower PAR scores than the 1-phase group before phase 2 (P =.0001). Lower PAR scores were achieved at both the beginning and end of phase 2 in girls (P =.03; P =.02, respectively). There were differences in the pre-phase-2 and post-phase-2 PAR scores based on initial severity (P =.0006; P =.02, respectively), with greater improvement in the patients whose malocclusions were less severe initially. Mandibular plane angle had no effect on pre-phase-2 or post-phase-2 PAR scores. These results do not support the hypothesis that different dentoalveolar outcomes are obtained between 2-phase and 1-phase treatment of Class II malocclusions.

Authors+Show Affiliations

Department of Orthodontics, University of Washington School of Dentistry, Seattle, WA 98195, USA. gking@u.washington.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

12750665

Citation

King, Gregory J., et al. "Comparison of Peer Assessment Ratings (PAR) From 1-phase and 2-phase Treatment Protocols for Class II Malocclusions." 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. 123, no. 5, 2003, pp. 489-96.
King GJ, McGorray SP, Wheeler TT, et al. Comparison of peer assessment ratings (PAR) from 1-phase and 2-phase treatment protocols for Class II malocclusions. Am J Orthod Dentofacial Orthop. 2003;123(5):489-96.
King, G. J., McGorray, S. P., Wheeler, T. T., Dolce, C., & Taylor, M. (2003). Comparison of peer assessment ratings (PAR) from 1-phase and 2-phase treatment protocols for Class II malocclusions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 123(5), 489-96.
King GJ, et al. Comparison of Peer Assessment Ratings (PAR) From 1-phase and 2-phase Treatment Protocols for Class II Malocclusions. Am J Orthod Dentofacial Orthop. 2003;123(5):489-96. PubMed PMID: 12750665.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of peer assessment ratings (PAR) from 1-phase and 2-phase treatment protocols for Class II malocclusions. AU - King,Gregory J, AU - McGorray,Susan P, AU - Wheeler,Timothy T, AU - Dolce,Calogero, AU - Taylor,Marie, PY - 2003/5/17/pubmed PY - 2003/6/17/medline PY - 2003/5/17/entrez SP - 489 EP - 96 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 - 123 IS - 5 N2 - The purpose of this study was to compare the dentoalveolar outcomes after 1-phase and 2-phase orthodontic treatment of Class II malocclusions. Class II subjects (n = 208) were randomized to 1-phase or 2-phase treatment with either bionator or headgear/biteplate. The peer assessment rating (PAR) was calculated from pretreatment, prephase 2, and final study models. Chi-square, Kruskal-Wallis, and Wilcoxon rank sum tests were used to evaluate the differences among treatment groups, sexes, races, pretreatment, mandibular plane angle, severity, and compliance. Spearman rank correlation coefficients were used to examine relationships between PAR at different times. The dropout rate of 24.6% did not adversely affect the ability to detect differences of clinical importance or impact treatment groups disproportionately. There were no significant differences with respect to initial PAR or final PAR among the 3 treatment protocols. The 2 early treatment groups had lower PAR scores than the 1-phase group before phase 2 (P =.0001). Lower PAR scores were achieved at both the beginning and end of phase 2 in girls (P =.03; P =.02, respectively). There were differences in the pre-phase-2 and post-phase-2 PAR scores based on initial severity (P =.0006; P =.02, respectively), with greater improvement in the patients whose malocclusions were less severe initially. Mandibular plane angle had no effect on pre-phase-2 or post-phase-2 PAR scores. These results do not support the hypothesis that different dentoalveolar outcomes are obtained between 2-phase and 1-phase treatment of Class II malocclusions. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/12750665/Comparison_of_peer_assessment_ratings__PAR__from_1_phase_and_2_phase_treatment_protocols_for_Class_II_malocclusions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540603000453 DB - PRIME DP - Unbound Medicine ER -