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Effect of anterior overbite malocclusion on smile esthetics in adult patients

Authors
  • Cheng, Johnson Hsin-Chung1, 2
  • Lee, Tracy Yi-Hsuan2
  • Cheng, Pei-Chin1, 2
  • Chen, Daniel De-Shing1, 2
  • 1 School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei
  • 2 pital, Taipei
Type
Published Article
Journal
The Journal of International Medical Research
Publisher
SAGE Publications
Publication Date
Sep 29, 2021
Volume
49
Issue
9
Identifiers
DOI: 10.1177/03000605211039578
PMID: 34586921
PMCID: PMC8485301
Source
PubMed Central
Keywords
Disciplines
  • Retrospective Clinical Research Report
License
Unknown

Abstract

Objective To investigate whether overbite affects smile esthetics. Methods This study involved 106 patients with complete pretreatment records. Lateral cephalometric tracings were used to measure hard tissue variables. Frontal smile and upper occlusal photographs were used to measure nine smile esthetic variables: arc ratio, number of teeth, upper incisor exposure, upper midline, buccal corridor ratio, smile index, archform index, lower teeth exposure, and interlabial gap. The patients were classified into three groups according to their overbites (B1: 0–4 mm, B2: >4 mm, and B3: <0 mm). Analysis of variance was performed to compare 14 cephalometric measurements and the 9 smile esthetic variables. Multiple linear regression analysis was performed to determine the influencing cephalometric factors. Results Only upper incisor exposure was significantly different among the groups. In the multiple linear regression analysis, upper incisor exposure was positively associated with the distance from the upper incisor to the palatal plane in Group B2. No significant correlations were observed between cephalometric measurements and smile variables in Groups B1 and B3. Conclusions Smile variables were not significantly different among patients with various overbite malocclusions with the exception of upper incisor exposure. Overbite malocclusions do not appear to influence smile esthetics in adult patients.

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