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A controlled clinical trial of the effects of the Twin Block and Dynamax appliances on the hard and soft tissues.
Eur J Orthod. 2007 Jun; 29(3):272-82.EJ

Abstract

The aim of this controlled trial was to identify and quantify skeletal, soft tissue and dental changes during treatment, and immediately post-treatment with Twin Block (TB) or Dynamax appliance using the techniques of three-dimensional (3D)optical surface laser scanning, cephalometric, and clinical measurements. Sixty-two Caucasian subjects, 36 males aged 11-14 years and 26 females aged 10-13 years were enrolled in the study. The patients were placed in two groups, matched for gender and age and subsequently allocated randomly for treatment with either a TB or Dynamax appliance. Active treatment lasted 9 months followed by 3 months' post-treatment observation. Laser scanning and clinical measurements were taken at 3-monthly intervals and final cephalometric records after 12 months. Statistical analysis was performed using Wilcoxon's matched-pairs signed-rank tests. The non-compliance rates were the same for both groups (9 per cent), but a greater incidence of breakages was found in the Dynamax group. The TB was found to produce slightly more antero-posterior skeletal change, median ANB reduction, TB=2 degrees, Dynamax 1.1 degree (P=0.006), and similar forward movements of the chin and was associated with larger increases in the vertical facial dimension, median total anterior face height increase; TB=3.2 mm, Dynamax = 2.8 mm (P=0.03). The soft tissue vertical cephalometric increases were 3.6 mm with the TB, 2.0 mm with the Dynamax (P=0.036), and with laser scanning 5.05 and 2.6 mm, respectively, a difference which is likely to be more clinically relevant. The median post-treatment changes in soft tissue pogonion were -0.65 mm in the TB and +0.22 mm in the Dynamax group. The optical surface scanning mark and measure system is a valid method for quantifying soft tissue changes.

Authors+Show Affiliations

Department of Orthodontics, Royal London Hospital, London, UK. R.T.Lee@qmul.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

17456506

Citation

Lee, R T., et al. "A Controlled Clinical Trial of the Effects of the Twin Block and Dynamax Appliances On the Hard and Soft Tissues." European Journal of Orthodontics, vol. 29, no. 3, 2007, pp. 272-82.
Lee RT, Kyi CS, Mack GJ. A controlled clinical trial of the effects of the Twin Block and Dynamax appliances on the hard and soft tissues. Eur J Orthod. 2007;29(3):272-82.
Lee, R. T., Kyi, C. S., & Mack, G. J. (2007). A controlled clinical trial of the effects of the Twin Block and Dynamax appliances on the hard and soft tissues. European Journal of Orthodontics, 29(3), 272-82.
Lee RT, Kyi CS, Mack GJ. A Controlled Clinical Trial of the Effects of the Twin Block and Dynamax Appliances On the Hard and Soft Tissues. Eur J Orthod. 2007;29(3):272-82. PubMed PMID: 17456506.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A controlled clinical trial of the effects of the Twin Block and Dynamax appliances on the hard and soft tissues. AU - Lee,R T, AU - Kyi,C S, AU - Mack,G J, Y1 - 2007/04/24/ PY - 2007/4/26/pubmed PY - 2007/10/5/medline PY - 2007/4/26/entrez SP - 272 EP - 82 JF - European journal of orthodontics JO - Eur J Orthod VL - 29 IS - 3 N2 - The aim of this controlled trial was to identify and quantify skeletal, soft tissue and dental changes during treatment, and immediately post-treatment with Twin Block (TB) or Dynamax appliance using the techniques of three-dimensional (3D)optical surface laser scanning, cephalometric, and clinical measurements. Sixty-two Caucasian subjects, 36 males aged 11-14 years and 26 females aged 10-13 years were enrolled in the study. The patients were placed in two groups, matched for gender and age and subsequently allocated randomly for treatment with either a TB or Dynamax appliance. Active treatment lasted 9 months followed by 3 months' post-treatment observation. Laser scanning and clinical measurements were taken at 3-monthly intervals and final cephalometric records after 12 months. Statistical analysis was performed using Wilcoxon's matched-pairs signed-rank tests. The non-compliance rates were the same for both groups (9 per cent), but a greater incidence of breakages was found in the Dynamax group. The TB was found to produce slightly more antero-posterior skeletal change, median ANB reduction, TB=2 degrees, Dynamax 1.1 degree (P=0.006), and similar forward movements of the chin and was associated with larger increases in the vertical facial dimension, median total anterior face height increase; TB=3.2 mm, Dynamax = 2.8 mm (P=0.03). The soft tissue vertical cephalometric increases were 3.6 mm with the TB, 2.0 mm with the Dynamax (P=0.036), and with laser scanning 5.05 and 2.6 mm, respectively, a difference which is likely to be more clinically relevant. The median post-treatment changes in soft tissue pogonion were -0.65 mm in the TB and +0.22 mm in the Dynamax group. The optical surface scanning mark and measure system is a valid method for quantifying soft tissue changes. SN - 0141-5387 UR - https://www.unboundmedicine.com/medline/citation/17456506/A_controlled_clinical_trial_of_the_effects_of_the_Twin_Block_and_Dynamax_appliances_on_the_hard_and_soft_tissues_ L2 - https://academic.oup.com/ejo/article-lookup/doi/10.1093/ejo/cjm004 DB - PRIME DP - Unbound Medicine ER -