Tags

Type your tag names separated by a space and hit enter

Prospective clinical trial comparing the effects of conventional Twin-block and mini-block appliances: Part 2. Soft tissue changes.
Am J Orthod Dentofacial Orthop. 2005 Apr; 127(4):473-82.AJ

Abstract

PURPOSE

The aims of this prospective clinical trial were to compare the soft tissue effects of Twin-block (TB) and mini-block (MB) functional appliances by using lateral cephalograms and optical surface laser scans and to evaluate the extent of posttreatment relapse with both appliances.

MATERIAL

Seventy Class II Division 1 patients meeting set inclusion criteria were matched by age and sex. The matched pairs were randomly allocated to treatment with either the TB or the MB appliance. The appliances were worn full time for 9 months (phase I), followed by a 3-month observation phase of no appliance wear (phase II). Lateral cephalograms were taken at the start of treatment and at 12 months, and laser scans were taken at 0, 3, 9, and 12 months.

RESULTS

Radiographically, there was a greater advancement of the soft tissue pogonion in the TB group (median, TB: 4.0 mm; MB: 1.8 mm; P = .004), whereas the soft tissue anterior face height increased similarly in both groups (median, TB: 4.4 mm; MB: 4.3 mm). Optical surface scans confirmed the cephalometric changes. There were a greater forward movement of soft tissue pogonion in the TB group during active treatment (median change, TB: 3.2 mm; MB: 3.9 mm) and similar increases in the soft tissue total anterior face height (median change, TB: 3.2 mm; MB: 3.9 mm). There were negative changes of soft tissue pogonion (median, TB: -1.0 mm; MB: -0.9 mm) and vertical face height (median change, TB: -0.7; MB: -0.6) during phase II.

CONCLUSIONS

The TB appliance produced the greater overall change in the soft tissue profile. However, there were clinically significant relapse changes in the immediate postfunctional phase.

Authors+Show Affiliations

The Royal London Hospital, United Kingdom. ashvin1000@hotmail.comNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

15821692

Citation

Sharma, Ashvin A., and Robert T. Lee. "Prospective Clinical Trial Comparing the Effects of Conventional Twin-block and Mini-block Appliances: Part 2. Soft Tissue Changes." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 127, no. 4, 2005, pp. 473-82.
Sharma AA, Lee RT. Prospective clinical trial comparing the effects of conventional Twin-block and mini-block appliances: Part 2. Soft tissue changes. Am J Orthod Dentofacial Orthop. 2005;127(4):473-82.
Sharma, A. A., & Lee, R. T. (2005). Prospective clinical trial comparing the effects of conventional Twin-block and mini-block appliances: Part 2. Soft tissue changes. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 127(4), 473-82.
Sharma AA, Lee RT. Prospective Clinical Trial Comparing the Effects of Conventional Twin-block and Mini-block Appliances: Part 2. Soft Tissue Changes. Am J Orthod Dentofacial Orthop. 2005;127(4):473-82. PubMed PMID: 15821692.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Prospective clinical trial comparing the effects of conventional Twin-block and mini-block appliances: Part 2. Soft tissue changes. AU - Sharma,Ashvin A, AU - Lee,Robert T, PY - 2005/4/12/pubmed PY - 2005/5/3/medline PY - 2005/4/12/entrez SP - 473 EP - 82 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 127 IS - 4 N2 - PURPOSE: The aims of this prospective clinical trial were to compare the soft tissue effects of Twin-block (TB) and mini-block (MB) functional appliances by using lateral cephalograms and optical surface laser scans and to evaluate the extent of posttreatment relapse with both appliances. MATERIAL: Seventy Class II Division 1 patients meeting set inclusion criteria were matched by age and sex. The matched pairs were randomly allocated to treatment with either the TB or the MB appliance. The appliances were worn full time for 9 months (phase I), followed by a 3-month observation phase of no appliance wear (phase II). Lateral cephalograms were taken at the start of treatment and at 12 months, and laser scans were taken at 0, 3, 9, and 12 months. RESULTS: Radiographically, there was a greater advancement of the soft tissue pogonion in the TB group (median, TB: 4.0 mm; MB: 1.8 mm; P = .004), whereas the soft tissue anterior face height increased similarly in both groups (median, TB: 4.4 mm; MB: 4.3 mm). Optical surface scans confirmed the cephalometric changes. There were a greater forward movement of soft tissue pogonion in the TB group during active treatment (median change, TB: 3.2 mm; MB: 3.9 mm) and similar increases in the soft tissue total anterior face height (median change, TB: 3.2 mm; MB: 3.9 mm). There were negative changes of soft tissue pogonion (median, TB: -1.0 mm; MB: -0.9 mm) and vertical face height (median change, TB: -0.7; MB: -0.6) during phase II. CONCLUSIONS: The TB appliance produced the greater overall change in the soft tissue profile. However, there were clinically significant relapse changes in the immediate postfunctional phase. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/15821692/Prospective_clinical_trial_comparing_the_effects_of_conventional_Twin_block_and_mini_block_appliances:_Part_2__Soft_tissue_changes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540604010017 DB - PRIME DP - Unbound Medicine ER -