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Assessed facial normality after Twin Block therapy.
Eur J Orthod. 2010 Aug; 32(4):363-70.EJ

Abstract

SUMMARY

The first aim of this study was to identify any difference in the perception of facial normality between orthodontists and lay people of patients with the initial presentation of a Class II division 1 malocclusion, the second is to investigate whether there was an identifiable facial change following Twin Block (TB) therapy, and lastly, the relationship between identifiable facial change and clinical measurements was explored. Animated laser scans of 16 randomly selected adolescent patients, nine males aged 12-14 years and seven females aged 11-13 years with Class II division 1 malocclusions before and after TB therapy, were assessed on a visual analogue scale (VAS) by 34 orthodontists and 35 lay people. The 'Mark and Measure' and 'Orientated' techniques were used to determine soft tissue dimensions. Overjet was also recorded. Non-parametric statistical analyses were employed, including Mann-Whitney, Wilcoxon signed value, and Spearman's rank-order correlation tests. There was no statistically significant difference in facial normality scores of adolescents before TB therapy when assessed by orthodontists (46.2 mm) and lay people (50.9 mm; P = 0.120). However, TB therapy significantly improved the assessment score of the orthodontists (54.8 mm) and lay people (57.8 mm; P = 0.000). Using a 5 per cent threshold in categorization of change in VAS scores, the majority of assessors perceived an overall 'improvement' (87.0 per cent). An increase in soft tissue lower face height (ST LFH) and overjet reduction was strongly correlated with the higher assessments of lay people (r = 0.515) and orthodontists (r = -0.505), respectively. Although orthodontists and lay people assess facial normality of patients with Class II division 1 malocclusions similarly, following TB therapy an increase in ST LFH with lay people and overjet reduction with orthodontists were most closely related to improved facial normality.

Authors+Show Affiliations

Orthodontic Department, Royal London Hospital, London, UK.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20133514

Citation

Sattarzadeh, Ali Payam, and Robert T. Lee. "Assessed Facial Normality After Twin Block Therapy." European Journal of Orthodontics, vol. 32, no. 4, 2010, pp. 363-70.
Sattarzadeh AP, Lee RT. Assessed facial normality after Twin Block therapy. Eur J Orthod. 2010;32(4):363-70.
Sattarzadeh, A. P., & Lee, R. T. (2010). Assessed facial normality after Twin Block therapy. European Journal of Orthodontics, 32(4), 363-70. https://doi.org/10.1093/ejo/cjp141
Sattarzadeh AP, Lee RT. Assessed Facial Normality After Twin Block Therapy. Eur J Orthod. 2010;32(4):363-70. PubMed PMID: 20133514.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Assessed facial normality after Twin Block therapy. AU - Sattarzadeh,Ali Payam, AU - Lee,Robert T, Y1 - 2010/02/04/ PY - 2010/2/6/entrez PY - 2010/2/6/pubmed PY - 2010/11/17/medline SP - 363 EP - 70 JF - European journal of orthodontics JO - Eur J Orthod VL - 32 IS - 4 N2 - SUMMARY: The first aim of this study was to identify any difference in the perception of facial normality between orthodontists and lay people of patients with the initial presentation of a Class II division 1 malocclusion, the second is to investigate whether there was an identifiable facial change following Twin Block (TB) therapy, and lastly, the relationship between identifiable facial change and clinical measurements was explored. Animated laser scans of 16 randomly selected adolescent patients, nine males aged 12-14 years and seven females aged 11-13 years with Class II division 1 malocclusions before and after TB therapy, were assessed on a visual analogue scale (VAS) by 34 orthodontists and 35 lay people. The 'Mark and Measure' and 'Orientated' techniques were used to determine soft tissue dimensions. Overjet was also recorded. Non-parametric statistical analyses were employed, including Mann-Whitney, Wilcoxon signed value, and Spearman's rank-order correlation tests. There was no statistically significant difference in facial normality scores of adolescents before TB therapy when assessed by orthodontists (46.2 mm) and lay people (50.9 mm; P = 0.120). However, TB therapy significantly improved the assessment score of the orthodontists (54.8 mm) and lay people (57.8 mm; P = 0.000). Using a 5 per cent threshold in categorization of change in VAS scores, the majority of assessors perceived an overall 'improvement' (87.0 per cent). An increase in soft tissue lower face height (ST LFH) and overjet reduction was strongly correlated with the higher assessments of lay people (r = 0.515) and orthodontists (r = -0.505), respectively. Although orthodontists and lay people assess facial normality of patients with Class II division 1 malocclusions similarly, following TB therapy an increase in ST LFH with lay people and overjet reduction with orthodontists were most closely related to improved facial normality. SN - 1460-2210 UR - https://www.unboundmedicine.com/medline/citation/20133514/Assessed_facial_normality_after_Twin_Block_therapy_ L2 - https://academic.oup.com/ejo/article-lookup/doi/10.1093/ejo/cjp141 DB - PRIME DP - Unbound Medicine ER -