ABSTRACT
Purpose@#This study evaluated the associations of the dental arch form, age-sex groups, and sagittal root position (SRP) with alveolar bone thickness of the maxillary central incisors using cone-beam computed tomography (CBCT) images. @*Materials and Methods@#CBCT images of 280 patients were categorized based on the dental arch form and age-sex groups. From these patients, 560 sagittal CBCT images of the maxillary central incisors were examined to measure the labial and palatal bone thickness at the apex level and the palatal bone at the mid-root level, according to the SRP classification. The chi-square test, Kruskal-Wallis test, and multiple linear regression were used for statistical analyses. @*Results@#Significant differences were found in alveolar bone thickness depending on the arch form and SRP at the apex level. The square dental arch form and class I SRP showed the highest bone thickness at both levels of the palatal aspect. The taper dental arch form and class II SRP presented the highest bone thickness at the apex level of the labial aspect. No association was found between the dental arch form and SRP. Elderly women showed a significant association with thinner alveolar bone. Age-sex group, the dental arch form, and SRP had significant associations with alveolar bone thickness at the apex level. @*Conclusion@#The patient’s age-sex group, dental arch form, and SRP were associated with alveolar bone thickness around the maxillary central incisors with varying magnitudes. Therefore, clinicians should take these factors into account when planning immediate implant placement.
ABSTRACT
Objective: The aim of this study was to determine the distance and direction of the optic foramen and inferior orbital rim at the reference point above infraorbital foramen. Materials and methods: Among the patients who had undergone CT scan by CT I-CAT, we evaluated the results of 150 orbits (75 male and 75 female). We measured distances and angles of optic foramen from inferior orbital rim by Simplant Master version 11 and Simplant CMF Module. Using the mean, standard deviation and 95% CI, all were analyzed by SPSS 11.5 for Window. Statistical differences were calculated between males and females using unpaired t-test. Results: The distances from optic foramen to inferior orbital rim above infraorbital foramen in males and females were 49.15+/-3.09 and 46.74+/-2.87 mm respectively (p=.000) and 95% CI were 48.44›49.87 and 46.08-47.40 mm respectively. The angle between the imaginary line drawing from optic foramen to that point on the inferior orbital rim and the saggital plane in males and females were 18.55+/-3.40 and 20.23+/-3.80 degree respectively (p=.005) and 95% CI were 17.76-19.33 and 17.37-18.97 degree respectively. Conclusion: In males, the optic foramen were located at 49.15+/-3.09 mm away from inferior orbital rim above infraorbital foramen and their directions were 18.55+/-3.40 degree medially to saggital plane. In females, the optic foramens were located at 46.74+/-2.87 mm away from inferior orbital rim above infraorbital foramen and their directions were 20.23+/-3.80 degree medially to saggital plane. From statistical data, l andmark of optic foramen were significantly difference in males and females.