AN ANALYSIS OF MAXILLARY CENTRAL INCISOR MORPHOLOGY IN A NORTHEAST THAI YOUNG ADULTS POPULATION USING INTRAORAL SCANNER AND AUTOCAD SOFTWARE

Abstract

The purpose of this study was to analyze the shape of maxillary central incisors in a Northeast Thai young adults population and to evaluate its association with gender stereotypes using a fully digital workflow. A total of 100 participants (50 males and 50 females; 18-35 years) were enrolled after providing informed consent. Maxillary central incisor morphology was recorded using an intraoral scanner. Tooth shape was calculated as the tooth quotient (TQ) classified as square, ovoid, or taper using AutoCAD software. Chi-square was utilized to analyze the relationship between tooth shape and gender (α = .05). The result showed that taper was the most overall frequency (42%). According to gender taper was predominant among males (58%), while ovoid was most common in females (48%). Square occurred least frequently in both genders (male 16%, female 24%). A statistically significant association was found between gender and maxillary central incisor tooth shape categories (p = .017). Intra-examiner reliability was excellent (ICC = .973). Within the limitations of this study, gender was associated with differences in maxillary central incisor tooth shape distribution. These findings indicate that tooth shape categories may correspond to gender-related characteristics in a Northeast Thai young adults population and may serve as a useful consideration in esthetic smile restoration planning.

Keywords: Tooth Shape, Central Maxillary Incisor, Young Adult Thai Population