Changes in lower incisor inclination following the treatment of Class II malocclusions with the Twin-Block and Button-and-Bead appliances: a single centre randomised controlled trial

Patel, Chandni (2020). Changes in lower incisor inclination following the treatment of Class II malocclusions with the Twin-Block and Button-and-Bead appliances: a single centre randomised controlled trial. University of Birmingham. M.Sc.

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Abstract

AIM: To compare post-treatment changes in lower incisor inclination in patients with Class II division 1 malocclusions treated with the Twin-Block and Button-and-Bead appliances.

METHOD: A UK based, single centre, prospective, two-armed randomised controlled trial with a 1:1 allocation ratio was conducted at the Birmingham Dental Hospital between July 2017 and January 2018. A total of 64 participants (28 males and 36 females) were recruited to the study and participants were randomly allocated to one of the two arms of the study. The primary outcome measure was differences in changes in lower incisor inclination in patients treated with the Twin-Block and Button-and-Bead appliances. Secondary outcomes included differences in the changes in upper incisor inclination, the ANB angle, changes in the maxillary-mandibular planes angle (MMPA) and lower anterior face height (LAFH).

RESULTS: Treatment was successfully completed by 47 participants (21 males and 26 females). A total of 17 (27%) participants did not complete the intervention as planned. There was no statistically significant difference in the change in lower incisor inclination between the two appliances (p=0.372). The Button-and-Bead appliance resulted in a statistically significant greater degree of upper incisor retroclination whilst the Twin-Block appliance resulted in statistically significant greater reductions in the ANB angle. No statistically significant differences were found for MMPA and LAFH between the two appliances.

CONCLUSION: Both appliances were effective in the treatment of Class II division 1 malocclusions. The Twin-Block appliance appeared to result in a greater degree of skeletal change compared to the Button-and-Bead appliance, although these differences are unlikely to be of clinical significance. There was no difference in the degree of lower incisor proclination between the two appliances.

Type of Work:

Thesis (Masters by Research > M.Sc.)

Award Type:

Masters by Research > M.Sc.

Supervisor(s):