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Article: Evaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index

TitleEvaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR index
Authors
Issue Date2000
PublisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodo
Citation
American Journal Of Orthodontics And Dentofacial Orthopedics, 2000, v. 118 n. 4, p. 414-420 How to Cite?
AbstractThe 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.
Persistent Identifierhttp://hdl.handle.net/10722/154115
ISSN
2015 Impact Factor: 1.69
2015 SCImago Journal Rankings: 1.249
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNgan, Pen_US
dc.contributor.authorYiu, CKYen_US
dc.date.accessioned2012-08-08T08:23:20Z-
dc.date.available2012-08-08T08:23:20Z-
dc.date.issued2000en_US
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics, 2000, v. 118 n. 4, p. 414-420en_US
dc.identifier.issn0889-5406en_US
dc.identifier.urihttp://hdl.handle.net/10722/154115-
dc.description.abstractThe 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.en_US
dc.languageengen_US
dc.publisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodoen_US
dc.relation.ispartofAmerican Journal of Orthodontics and Dentofacial Orthopedicsen_US
dc.rightsAmerican Journal of Orthodontics and Dentofacial Orthopedics. Copyright © Mosby, Inc.-
dc.subject.meshChilden_US
dc.subject.meshExtraoral Traction Appliancesen_US
dc.subject.meshFemaleen_US
dc.subject.meshHumansen_US
dc.subject.meshMaleen_US
dc.subject.meshMalocclusion, Angle Class Iii - Therapyen_US
dc.subject.meshOrthodontic Appliance Designen_US
dc.subject.meshOrthodontic Retainersen_US
dc.subject.meshOrthodontics, Corrective - Instrumentationen_US
dc.subject.meshOutcome Assessment (Health Care) - Methodsen_US
dc.subject.meshPeer Review, Health Careen_US
dc.subject.meshRecurrenceen_US
dc.subject.meshReproducibility Of Resultsen_US
dc.subject.meshStatistics, Nonparametricen_US
dc.titleEvaluation of treatment and posttreatment changes of protraction facemask treatment using the PAR indexen_US
dc.typeArticleen_US
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0889-5406&volume=118&spage=414&epage=420&date=2000&atitle=Evaluation+of+treatment+and+post+treatment+change+of+protraction+facemask+treatment+using+the+PAR+index.-
dc.identifier.emailYiu, CKY: ckyyiu@hkucc.hku.hken_US
dc.identifier.authorityYiu, C=rp00018en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1067/mod.2000.108253en_US
dc.identifier.pmid11029737en_US
dc.identifier.scopuseid_2-s2.0-0034296287en_US
dc.identifier.hkuros114888-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034296287&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume118en_US
dc.identifier.issue4en_US
dc.identifier.spage414en_US
dc.identifier.epage420en_US
dc.identifier.isiWOS:000089925900012-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridNgan, P=7006250823en_US
dc.identifier.scopusauthoridYiu, C=7007115156en_US

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