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Randomized Controlled Trial
. 2020 Mar;90(2):202-208.
doi: 10.2319/042419-290.1. Epub 2019 Oct 15.

Frankel 2 appliance versus the Modified Twin Block appliance for Phase 1 treatment of Class II division 1 malocclusion in children and adolescents: A randomized clinical trial

Ciara Campbell, Declan Millett, Niamh Kelly, Marie Cooke, Michael Cronin
Randomized Controlled Trial

Frankel 2 appliance versus the Modified Twin Block appliance for Phase 1 treatment of Class II division 1 malocclusion in children and adolescents: A randomized clinical trial

Ciara Campbell et al. Angle Orthod. 2020 Mar.

Abstract

Objective: To compare Phase 1 treatment, using the Frankel 2 (FR2) or the modified Twin Block (MTB), for Class II division 1 malocclusion in children and adolescents with respect to: treatment duration, number of appliance breakages, occlusal outcome, and patient and parent perspectives.

Materials and methods: Sixty participants with a Class II division 1 malocclusion were randomly assigned to either the FR2 or MTB appliance in a two-armed parallel randomized clinical trial with an allocation ratio of 1 to 1. Time to achieve a Class I incisor relationship was the primary outcome. The number of appliance breakages was recorded. The Peer Assessment Rating (PAR) index was used to evaluate pre- and post-treatment occlusal outcome on study models. Participants completed the child OHRQoL (oral health-related quality of life), Piers-Harris, Standard Continuum of Aesthetic Need (SCAN), and Oral Aesthetic Subjective Impact Score (OASIS) questionnaires pre- and post-treatment; parents completed a SCAN questionnaire.

Results: Forty-two participants completed treatment (FR2: 20; MTB: 22). Multiple imputation was used to impute missing data for noncompleters. Mean treatment duration was similar for the two appliances (FR2: 376 days [SD 101]; MTB: 340 days [SD 102]; P = .41). There were no significant differences in mean number of appliance breakages (FR2: 0.3 SD 0.7; MTB: 0.4 SD 0.8; P = .67 or mean PAR score P = .48). Patient and parent perspectives did not differ between appliances (P > .05).

Conclusions: Phase 1 treatment duration, number of appliance breakages, occlusal outcome, and patient and parent perspectives were similar in 11-14 year olds with Class II division 1 malocclusion treated using the FR2 or MTB appliance.

Keywords: Class II division 1 malocclusion; Frankel appliance; Phase 1 treatment duration; Twin Block appliance.

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Figures

Figure 1.
Figure 1.
Appliance types used in this study: (a) FR2 and (b) MTB.
Figure 2.
Figure 2.
CONSORT (Consolidated Standards of Reporting Trials) flow diagram.
See this image and copyright information in PMC

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