RESUMEN

OBJECTIVES: To evaluate the validity of the Golden Proportion, Golden Percentage, and Recurring Esthetic Dental (RED) Proportion among Kenyans of African descent with naturally well-aligned teeth. MATERIALS AND METHODS: Standardized frontal photographic images of the smiles of 175 participants aged 18-35 years were obtained, and Adobe Photoshop was used to analyze and measure the frontal widths of the maxillary central and lateral incisors and canines in triplicate. The average teeth widths were calculated to determine the existence of the Golden Proportion, Golden Percentage, and RED Proportion, and their validity using independent sample t-tests to compare the differences in the mean teeth widths at α < 0.05. RESULTS: The number of male and female participants was 107 (61.1%) and 68 (38.9%), respectively. The Golden Proportion between the maxillary central and lateral incisors was found in 4.0% on the right and 2.8% on the left of all the participants, but between the maxillary lateral incisors and canines was found in only 0.6% on the right of male participants (p < 0.0001). The RED Proportion between the maxillary lateral and central incisors was in the range of 67%-70%, and between the canines and lateral incisors was 82%-84% (p < 0.0001). The proportion of RED was not constant, and gradually increased distally. The Golden Percentage of 15% was observed in the lateral incisors bilaterally; however, in the central incisors and the canines, the Golden Percentage was 22% and 12%, respectively. CONCLUSION: The Golden and RED Proportions were invalid determinants of anterior teeth proportions. The Golden Percentage existed only in the lateral incisors. The Golden Proportion, RED Proportion, and Golden Percentage theories may not be applicable to all populations when designing smiles. Racial and ethnic backgrounds are important considerations to establish objective quantifiable values of anterior tooth proportions that are beneficial for esthetic restorations.

Asunto(s)

Población Negra , Diente Canino , Estética Dental , Incisivo , Odontometría , Humanos , Masculino , Femenino , Adulto , Adolescente , Incisivo/anatomía & histología , Población Negra/estadística & datos numéricos , Adulto Joven , Diente Canino/anatomía & histología , Odontometría/métodos , Kenia , Sonrisa , Maxilar/anatomía & histología , Fotografía Dental

RESUMEN

AIM: To evaluate the width/height proportions in maxillary anterior natural dentition and its correlation with Chu's esthetic proportion Gauge. SETTINGS AND DESIGN: Observational cross-sectional study with the inclusion criteria of well aligned maxillary anterior teeth. PURPOSE: The present study attempts to perceive the application of Chu's Esthetic Proportion Gauge in a group of the central Indian population. METHODS: A total number of 150 participants within the age group 18-30 years were screened, out of which 80 participants were selected, who fulfilled the inclusion criteria of well aligned maxillary anterior teeth with pleasing smile, unrestored, periodontally sound, no fracture, no missing, absence of diastema teeth and no H/O orthodontic treatment. The selected participants were seated on the dental chair with the Frankforts horizontal plane parallel to the floor. The participants were observed for height and width proportions using the Chu's esthetic proportion gauge and measured using digital vernier calliper. The proportion and measured height and width ratios were then compared. RESULTS: The recorded data was compiled and entered in a spreadsheet computer program (Microsoft Excel 2007) and then exported to data editor page of SPSS version 20.0 (SPSS Inc., Chicago, Illinois, USA). Intergroup comparison between gauge and vernier caliper was done using Chi-square test for proportions percentages (Qualitative data) and Mann-Whitney U test of width and height and then categorized into esthetic and unesthetic anterior teeth. Level of significance was set at 0.05. CONCLUSIONS: Within the limitations of the study, it was concluded that maxillary anterior teeth did show similarity with Chu's esthetic proportion scale.