A single centre randomised controlled trial of the twin block and button & bead appliances in class II malocclusions

Haria, Paras Jiteshkumar ORCID: 0000-0001-6941-7478 (2022). A single centre randomised controlled trial of the twin block and button & bead appliances in class II malocclusions. University of Birmingham. M.Sc.

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Abstract

Aim: To determine if there is a clinical difference in the rate of overjet reduction using a Twin Block appliance or a Button & Bead appliance.
Method: A single centre, two-arm parallel, randomised controlled trial with a 1:1 allocation ratio was conducted. Sixty four patients (28 male, 36 female) between the age of 10 and 14 were recruited and randomly allocated to the Twin Block or Button & Bead group for functional appliance treatment. Treatment was provided in the orthodontic department at Birmingham Dental Hospital. Baseline, follow up and end of functional appliance treatment occlusal measurements and standard orthodontic records were taken. The primary outcome measure was the rate of overjet reduction. Secondary outcome measures included change in PAR, patient dropout and cost effectiveness of the appliances.
Results: Twenty four patients in the Twin Block group and twenty three patients in the Button & Bead group completed their assigned appliance treatment successfully. The remaining participants failed to complete their assigned appliance treatment either due to poor compliance, lack of efficacy or withdrawn consent. There was no statistically significant difference (0.1mm/month, p=0.517) in the rate of overjet reduction using a Twin Block (0.7-1.0mm/month 95% CI) or Button & Bead appliance (0.7-1.2mm/month 95% CI). There was a statistically significant difference between baseline and post-functional PAR scores in both groups. There were a high proportion of breakages in both groups. In the Twin Block group, the acrylic and clasps on the lower appliance were most likely to break whereas in the Button & Bead group, the acrylic and bead on the upper appliance were most likely to break.
Conclusion: There were no differences in the rate of overjet reduction and occlusal outcomes between both appliances.

Type of Work:

Thesis (Masters by Research > M.Sc.)

Award Type:

Masters by Research > M.Sc.

Supervisor(s):