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An extended period of functional appliance therapy: a controlled clinical trial comparing the Twin Block and Dynamax appliances.
Eur J Orthod. 2014 Oct; 36(5):512-21.EJ

Abstract

The aim of this clinical trial was to compare the hard- and soft-tissue effects of 15 month full-time functional appliance therapy with Twin Block (TB) and Dynamax (Dx) appliances. The effects on both hard and soft tissue were analysed using cephalograms and three-dimensional optical surface laser scans. One hundred and three subjects with a class II division 1 malocclusion, and a minimum overjet of 7mm were available for analysis following stratified randomization according to gender and age. Data was collected at the start of treatment, 15 month therapy, and after 3 month post-treatment observation. Statistical analysis was conducted using analysis of covariance. The results demonstrated both appliances corrected the overjet with significantly increased skeletal dimensional changes with the TB compared with the Dx with forward movement of pogonion of 5.2mm (TB) and 0.7mm (Dx) P = 0.003. In addition, significant changes occurred particularly in the vertical dimension where there was also an increase in total anterior face height in both groups (TB = 6.4mm, Dx = 5.5mm) and significant (P = 0.003) mandibular length changes were also observed (TB = 7.2mm, Dx = 3.8mm). The cephalometric soft-tissue changes were significantly different between the two appliances at soft-tissue pogonion (TB = 9.8mm, Dx = 4.6mm, P = 0.001). Laser scan three-dimansional changes showed significant difference in the lower labial sulcus region where forward movements were observed (TB = 8.2mm, Dx = 6.2mm; P = 0.04). Overall these changes appear to be greater and more stable than those achieved in a previous 9 month study.

Authors+Show Affiliations

*Department of Orthodontics, Bart's & The London NHS Trust, London, r.t.lee@qmul.ac.uk.*Department of Orthodontics, Bart's & The London NHS Trust, London.**East Kent Hospitals University NHS Foundation Trust.*Department of Orthodontics, Bart's & The London NHS Trust, London.***Department of Orthodontics, Q.M.U.L., London, UK.

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

23291502

Citation

Lee, Robert T., et al. "An Extended Period of Functional Appliance Therapy: a Controlled Clinical Trial Comparing the Twin Block and Dynamax Appliances." European Journal of Orthodontics, vol. 36, no. 5, 2014, pp. 512-21.
Lee RT, Barnes E, DiBiase A, et al. An extended period of functional appliance therapy: a controlled clinical trial comparing the Twin Block and Dynamax appliances. Eur J Orthod. 2014;36(5):512-21.
Lee, R. T., Barnes, E., DiBiase, A., Govender, R., & Qureshi, U. (2014). An extended period of functional appliance therapy: a controlled clinical trial comparing the Twin Block and Dynamax appliances. European Journal of Orthodontics, 36(5), 512-21. https://doi.org/10.1093/ejo/cjs076
Lee RT, et al. An Extended Period of Functional Appliance Therapy: a Controlled Clinical Trial Comparing the Twin Block and Dynamax Appliances. Eur J Orthod. 2014;36(5):512-21. PubMed PMID: 23291502.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An extended period of functional appliance therapy: a controlled clinical trial comparing the Twin Block and Dynamax appliances. AU - Lee,Robert T, AU - Barnes,Emma, AU - DiBiase,Andrew, AU - Govender,Ravichandram, AU - Qureshi,Usman, Y1 - 2013/01/04/ PY - 2013/1/8/entrez PY - 2013/1/8/pubmed PY - 2015/5/30/medline SP - 512 EP - 21 JF - European journal of orthodontics JO - Eur J Orthod VL - 36 IS - 5 N2 - The aim of this clinical trial was to compare the hard- and soft-tissue effects of 15 month full-time functional appliance therapy with Twin Block (TB) and Dynamax (Dx) appliances. The effects on both hard and soft tissue were analysed using cephalograms and three-dimensional optical surface laser scans. One hundred and three subjects with a class II division 1 malocclusion, and a minimum overjet of 7mm were available for analysis following stratified randomization according to gender and age. Data was collected at the start of treatment, 15 month therapy, and after 3 month post-treatment observation. Statistical analysis was conducted using analysis of covariance. The results demonstrated both appliances corrected the overjet with significantly increased skeletal dimensional changes with the TB compared with the Dx with forward movement of pogonion of 5.2mm (TB) and 0.7mm (Dx) P = 0.003. In addition, significant changes occurred particularly in the vertical dimension where there was also an increase in total anterior face height in both groups (TB = 6.4mm, Dx = 5.5mm) and significant (P = 0.003) mandibular length changes were also observed (TB = 7.2mm, Dx = 3.8mm). The cephalometric soft-tissue changes were significantly different between the two appliances at soft-tissue pogonion (TB = 9.8mm, Dx = 4.6mm, P = 0.001). Laser scan three-dimansional changes showed significant difference in the lower labial sulcus region where forward movements were observed (TB = 8.2mm, Dx = 6.2mm; P = 0.04). Overall these changes appear to be greater and more stable than those achieved in a previous 9 month study. SN - 1460-2210 UR - https://www.unboundmedicine.com/medline/citation/23291502/An_extended_period_of_functional_appliance_therapy:_a_controlled_clinical_trial_comparing_the_Twin_Block_and_Dynamax_appliances_ L2 - https://academic.oup.com/ejo/article-lookup/doi/10.1093/ejo/cjs076 DB - PRIME DP - Unbound Medicine ER -