Due to the challenging of esthetic outcome after tooth extraction. The information of alveolar bone thickness of variable sagittal root position (SRP) in maxillary central incisors in Thai population was still lacking. The objectives of this study are 1) To classify the degree of SRP in their alveolar bone housing and 2) To analyze the relationship of SRP with bone thickness, sex, and age in Thai population. 120 CBCT scans of maxillary central incisor area were selected and categorized into 3 age groups. The SRP were classified into 4 classes (I-IV). Bone thickness was measured at mid-root level on labial and palatal sides. The relationship of age and sex associated with SRP classification were analyzed using Chi-square test. The difference of labial and palatal bone thickness among groups were analyzed by Kruskal Wallis H test with Dunn’s post hoc test. It is found that Class II SRP (retroclined) showed highest frequency (40%). There were no significant differences of SRP between age groups and each sex. Majority of labial bone was £ 1mm (70%). Class I SRP showed highest bone thickness (0.96±0.49 mm) with significant difference when compared with Class II (0.70±0.37 mm) (p<0.05). 95.8% of subjects revealed palatal bone thickness ³ 1 mm except Class IV SRP (0.82±0.81 mm). Then, a majority of maxillary anterior teeth in Thai population were retroclined with labial bone thickness <1 mm and palatal bone thickness >1 mm. Hence, clinicians may use the palatal bone wall as a primary stability for the implant placement.