Abstract
Statement of problem
Different proportions of tooth width ratios have been evaluated, and the golden proportion
is the best known. Although the prevalence of the golden proportion has been evaluated
in different ethnic groups and populations, a meta-analysis of these studies is lacking.
Purpose
The purpose of this systematic review and meta-analysis was to investigate the existence
and suitability of the golden proportion for tooth width ratios and to assess the
prevalence of the golden proportion among populations.
Material and methods
A systematic search based on the Patient, Intervention, Comparison, Outcome (PICO)
and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines
was conducted in PubMed, Cochrane, Scopus, Web of Science, and Embase in January 2021
without any time limitations and included English and non-English-language articles.
Additional studies were identified by searching the reference lists of the retrieved
articles. Two reviewers independently performed the literature search and data extraction,
selecting articles based on the inclusion and exclusion criteria. Eligible studies
were selected based on the inclusion criteria, and quality assessments were conducted.
Descriptive statistics were applied for a number of outcome measures. Using a meta-analysis
software program, data extracted from each selected study were statistically combined
by using weighted mean differences and 95% confidence intervals, and heterogeneity
was calculated for each measurement.
Results
A total of 566 articles were retrieved based on the keyword search. After the articles
were assessed based on the inclusion and exclusion criteria, only 6 articles were
included in the meta-analysis.
Conclusions
The outcomes of the review and analyses demonstrate that evidence supporting the existence
of the golden proportion in natural smiles is lacking and that the existence of the
golden proportion in dentistry is a myth and not a fact. However, the golden percentage
theory can be applied with modified percentages that consider critical aspects of
esthetic dentistry.
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Article info
Publication history
Published online: September 04, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
