Objectives: The aims of this study were to determine the distribution of facial types and to compare the crown width/length ratio of six maxillary anterior teeth in two different facial groups in Bangladeshi population.

Methods: Measurements were done in 70 male and 70 female Bangladeshi adults. Facial index was used to determine the broad, average, and narrow facial type. Crown width/length ratio of six maxillary anterior teeth was measured from the study models. Percentage of each facial type was determined. Descriptive statistics and independent t-test were used to compare the crown width/length ratio between different facial types. Dahlberg test was used for error measurement and power test was performed to evaluate the power of the study.

Results: There were no patients with broad facial type. 55.71% of subjects represented narrow face and 44.28% represented average face. For male, 57.14% were narrow face and 42.85% were average face. For female, 54.28% were narrow face and 45.71% were average face. In male group, the mean crown width/length ratio and standard deviation of the central incisors, lateral incisor and canine in narrow face group were 0.921 mm±0.078 mm, 0.878 mm±0.172 mm and 0.896 mm±0.097 mm respectively. For average face group, the ratio was 0.914 mm±0.087 mm, 0.865 mm±0.112 mm and 0.885 mm±0.073 mm. In female group, the narrow face showed the ratio of 0.965 mm±0.107 mm, 0.898 mm±0.138 mm and 0.912 mm±0.087 mm. The average face group ratio was 0.989 mm±0.166 mm, 0.898 mm±0.092 mm and 0.910 mm±0.087 mm respectively. There was no significant difference in the mean crown width/length ratios of maxillary anterior teeth between narrow and average facial groups (p>. 05).

Conclusion: Crown width/length ratio of six maxillary anterior teeth obtained from this study can serve as a guideline for selection of appropriate tooth size and shape of anterior teeth for Bangladeshi population.