Soft tissue changes: a comparison between changes caused by the construction bite and by successful treatment with a modified Twin-block appliance

Erfan Salloum, Declan T. Millett (Lead / Corresponding author), Niamh Kelly, Grant T. McIntyre, Michael S. Cronin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
123 Downloads (Pure)

Abstract

Background/objectives: Functional appliances are commonly used to correct Class II malocclusion. This study aimed to compare the facial soft tissue changes in Caucasians between pre-treatment and with the construction bite versus pre-treatment and completion of treatment with a modified Twin-block appliance (MTBA).

Materials and methods: Fifty-eight Caucasian subjects with Class II division 1 malocclusion had 3D stereophotogrammetric images captured pre-treatment (T1), with the construction bite (T2), and on completion of MTBA treatment (T3). Twenty-six landmarks were located on each image and 10% were re-landmarked 1 month later. Soft-tissue linear and volumetric changes (T1-T2 and T1-T3) were analyzed using linear mixed effect models (SAS® Version 9.4, www.sas.com).

Results: Forty-seven subjects [mean age 13.2 (SD 1.7) years] completed treatment [mean duration 9.8 (SD 3.8) months]. Differences between the changes from T1 to T2 versus T1 to T3 for upper facial and upper lip landmarks were insignificant (all P > 0.05) except for nasion, orbitale right, pronasale, and subnasale. For the same comparisons, lower lip and chin landmarks changed significantly (all P < 0.05) as did facial soft tissue volume (P< 0.0001).

Limitations: There was no control group.

Conclusion: The facial soft tissue changes from pre-treatment to with the construction bite were considerably more than those from pre-treatment to completion of treatment with a MTBA.

Implication: With MTBA treatment, the soft tissue changes from pre-treatment to with the construction bite in situ, overestimate those from pre- to post-treatment.

Original languageEnglish
Pages (from-to)512-518
Number of pages7
JournalEuropean Journal of Orthodontics
Volume40
Issue number5
Early online date29 Dec 2017
DOIs
Publication statusPublished - Oct 2018

Keywords

  • Journal article
  • Chin
  • Face
  • Malocclusion
  • Twins
  • Lip
  • Soft tissue
  • Transverse spin relaxation time

Fingerprint

Dive into the research topics of 'Soft tissue changes: a comparison between changes caused by the construction bite and by successful treatment with a modified Twin-block appliance'. Together they form a unique fingerprint.

Cite this