Analysis of Recurrent Esthetic Dental Proportion of Natural Maxillary Anterior Teeth
abstract
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Access this abstract now Full Text Available for ClinicalKey SubscribersSTATEMENT OF PROBLEM
The recurrent esthetic dental (RED) proportion has been a benchmark for the rehabilitation of the maxillary anterior teeth of North American patients. While it has been evaluated in other populations, the global application of RED proportions in the rehabilitation of maxillary anterior teeth is unclear.
PURPOSE
The purpose of this systematic review was to examine the existing evidence on dental proportion to evaluate the existence of RED proportions in the esthetic smile in different geographic regions.
MATERIAL AND METHODS
A systematic search was conducted by reviewing different databases. The focused question was "Does RED proportion exist in esthetically pleasing smiles in different populations around the world?" The search included articles with a combination of MeSH keywords based on dental proportion from January 2000 to July 2020. The titles and abstracts were identified by using a search protocol. Full text of the articles was independently evaluated. The systematic review was modified to summarize the relevant data. The general characteristics, outcomes, and quality of studies were reviewed and analyzed systematically.
RESULTS
Seventeen studies were selected from the reviewed articles. Three studies were conducted in Europe, 10 in South Asia, and 4 in Western Asia. Eleven studies found that the mean perceived ratio of anterior teeth was not constant when progressing distally. Five studies reported that the ratio was constant in a small percentage of their populations, and 1 suggested that the ratio was constant if it remains between 60% and 80%. The central-to-LI and Ca-to-LI proportion values were not constant. Overall, the Ca-to-LI proportion values were higher than the central-to-LI proportions.
CONCLUSIONS
RED proportions were not found in the successive widths of maxillary anterior teeth among the reviewed data from different geographic regions. RED proportions are not the only standard for restoring esthetic smiles worldwide, and anterior tooth proportions differ among populations based on their race and ethnicity.
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Additional Info
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Analysis of recurrent esthetic dental proportion of natural maxillary anterior teeth: A systematic review
J Prosthet Dent 2022 Mar 08;[EPub Ahead of Print], N Ahmed, S Khalid, F Vohra, MS Halim, S Al-Saleh, HI Tulbah, AS Al-Qahtani, T AbduljabbarFrom MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
The purpose of this systematic review was to examine the existence of recurrent esthetic dental (RED) proportions for the esthetic smile in different geographic regions other than North America (eg, using a fixed proportion such as the golden proportion [ratio of 1.618:1, or 62%]).
Overall, 17 studies were selected from the reviewed articles. RED proportions were not found in the successive widths of maxillary anterior teeth. The central-to-lateral incisor (CI-LI) and canine-to-lateral incisor (Ca-LI) proportion values were not constant. Overall, the Ca-LI proportion values were higher than the CI-LI proportions.
As such, RED proportions were not found in the successive widths of maxillary anterior teeth among the reviewed data from different geographic regions. Anterior tooth proportions differed among populations based on their race and ethnicity.
Highlighted as well in the discussion section of this systematic review were the following considerations when restoring an esthetic smile for a particular patient:
In summary, as an esthetic guide for all ethnicities, clinicians should consider the use of regional dental proportions, patient perception, and their own clinical judgment to design esthetically pleasing dental restorations for different populations.