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Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index.
Am J Orthod Dentofacial Orthop. 2000 Oct; 118(4):414-20.AJ

Abstract

The purpose of this study was to use the Peer Assesment Rating (PAR) index score to evaluate the treatment and posttreatment changes of Class III patients treated by protraction facemask. The sample consisted of 20 Chinese children, 6 to 11 years old, with Class III skeletal malocclusion who had been treated with maxillary expansion and a protraction facemask. The average treatment time was 8.2 months, followed by 1 year of retention with a Class III functional appliance. Study casts were taken pretreatment (T1), posttreatment (T2), 1 year follow-up (T3), and 2 years follow-up (T4). After treatment, PAR scores were calculated for each time period. Differences among the 4 time periods were analyzed with the Wilcoxin matched-pairs test. Significant reductions in PAR scores were found at T2 (56%), T3 (70%), and T4 (63%) compared with T1. Immediately posttreatment (T2), 17 (85%) of 20 patients had improved PAR scores by a reduction of at least 30%. Reductions were caused primarily by correction of the anterior crossbite. One year after treatment (T3), further reductions in PAR score were noted (P <.01) as a result of better alignment of the anterior segment, improvement of the buccal occlusion, and overbite and midline corrections. Two years after treatment (T4), PAR scores were higher than at the previous time period. The increases were due to relapses in overjet (4 of 20 patients), overbite, and centerline corrections. These results indicate that significant reductions in the severity of Class III malocclusion can be achieved with early orthopedic facemask treatment. In most cases, further improvement in the PAR score can be expected 1 and 2 years after treatment. In a few patients, the benefits of early treatment are negated by relapses in overjet, overbite, and centerline corrections during the follow-up period.

Authors+Show Affiliations

Department of Orthodontics, West Virginia University School of Dentistry, Morgantown, WV 26506, USA.No affiliation info available

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

11029737

Citation

Ngan, P, and C Yiu. "Evaluation of Treatment and Posttreatment Changes of Protraction Facemask Treatment Using the PAR Index." 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. 118, no. 4, 2000, pp. 414-20.
Ngan P, Yiu C. Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index. Am J Orthod Dentofacial Orthop. 2000;118(4):414-20.
Ngan, P., & Yiu, C. (2000). Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 118(4), 414-20.
Ngan P, Yiu C. Evaluation of Treatment and Posttreatment Changes of Protraction Facemask Treatment Using the PAR Index. Am J Orthod Dentofacial Orthop. 2000;118(4):414-20. PubMed PMID: 11029737.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index. AU - Ngan,P, AU - Yiu,C, PY - 2000/10/13/pubmed PY - 2001/2/28/medline PY - 2000/10/13/entrez SP - 414 EP - 20 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 - 118 IS - 4 N2 - The purpose of this study was to use the Peer Assesment Rating (PAR) index score to evaluate the treatment and posttreatment changes of Class III patients treated by protraction facemask. The sample consisted of 20 Chinese children, 6 to 11 years old, with Class III skeletal malocclusion who had been treated with maxillary expansion and a protraction facemask. The average treatment time was 8.2 months, followed by 1 year of retention with a Class III functional appliance. Study casts were taken pretreatment (T1), posttreatment (T2), 1 year follow-up (T3), and 2 years follow-up (T4). After treatment, PAR scores were calculated for each time period. Differences among the 4 time periods were analyzed with the Wilcoxin matched-pairs test. Significant reductions in PAR scores were found at T2 (56%), T3 (70%), and T4 (63%) compared with T1. Immediately posttreatment (T2), 17 (85%) of 20 patients had improved PAR scores by a reduction of at least 30%. Reductions were caused primarily by correction of the anterior crossbite. One year after treatment (T3), further reductions in PAR score were noted (P <.01) as a result of better alignment of the anterior segment, improvement of the buccal occlusion, and overbite and midline corrections. Two years after treatment (T4), PAR scores were higher than at the previous time period. The increases were due to relapses in overjet (4 of 20 patients), overbite, and centerline corrections. These results indicate that significant reductions in the severity of Class III malocclusion can be achieved with early orthopedic facemask treatment. In most cases, further improvement in the PAR score can be expected 1 and 2 years after treatment. In a few patients, the benefits of early treatment are negated by relapses in overjet, overbite, and centerline corrections during the follow-up period. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/11029737/Evaluation_of_treatment_and_posttreatment_changes_of_protraction_facemask_treatment_using_the_PAR_index_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(00)52644-4 DB - PRIME DP - Unbound Medicine ER -