Class II Division 1 malocclusion treatment with extraction of maxillary first molars: Evaluation of treatment and post-treatment changes by the PAR Index.

Booij, Johan W; Kuijpers-Jagtman, Anne Marie; Bronkhorst, Ewald M; Livas, Christos; Ren, Yijin; Kuijpers, Mette A R; Katsaros, Christos (2021). Class II Division 1 malocclusion treatment with extraction of maxillary first molars: Evaluation of treatment and post-treatment changes by the PAR Index. Orthodontics & craniofacial research, 24(1), pp. 102-110. Wiley 10.1111/ocr.12412

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OBJECTIVE

To investigate occlusal result and post-treatment changes after orthodontic extraction of maxillary first permanent molars in patients with a Class II division 1 malocclusion.

SETTING AND SAMPLE

Retrospective longitudinal study in a private practice, with outcome evaluation by an independent academic hospital. Ninety-six patients (53 males, 43 females) consecutively treated by one orthodontist with maxillary first permanent molar extraction were studied, divided into three facial types, based on pre-treatment cephalometric values: hypodivergent (n = 18), normodivergent (n = 21) and hyperdivergent (n = 57).

METHODS

Occlusal outcome was scored on dental casts at T1 (pre-treatment), T2 (post-treatment) and T3 (mean follow-up 2.5 ± 0.9 years) using the weighted Peer Assessment Rating (PAR) Index. The paired sample t test and one-way ANOVA followed by Tukey's post hoc test were used for statistical analysis.

RESULTS

PAR was reduced by 95.7% and 89.9% at T2 and T3, respectively, compared with the start of treatment. The largest post-treatment changes were found for overjet and buccal occlusion. Linear regression analysis did not reveal a clear effect (R-Square 0.074) of age, sex, PAR score at T1, incremental PAR score T2-T1, overjet and overbite at T1, and facial type on the changes after treatment (incremental PAR score T3-T2).

CONCLUSIONS

The occlusal outcome achieved after Class II division 1 treatment with maxillary first permanent molar extractions was maintained to a large extent over a mean post-treatment follow-up of 2.5 years. Limited changes after treatment were found, for which no risk factors could be discerned.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Orthodontics

UniBE Contributor:

Kuijpers-Jagtman, Anne-Marie and Katsaros, Christos

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1601-6343

Publisher:

Wiley

Language:

English

Submitter:

Renate Imhof-Etter

Date Deposited:

27 Oct 2020 08:35

Last Modified:

18 Jan 2021 01:32

Publisher DOI:

10.1111/ocr.12412

PubMed ID:

32725964

Uncontrolled Keywords:

PAR index angle class II longitudinal study maxillary first molar extraction treatment outcome

BORIS DOI:

10.7892/boris.147087

URI:

https://boris.unibe.ch/id/eprint/147087

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