하악소주골 미세구조의 3차원적 분석

Abstract

Aim This study has used Micro-Computerized Tomograph(micro-CT) to compare morphology of alveolar and basal bone of specific measuring sites of premolar regions of mandible

Materials and Methods Three specimens were prepared and Micro-CT was taken. The structural analysis of the trabecular bone of alveolar and basal bone between the first and second premolar were carried out. The cross sectional image was consisted of 1024×1024 pixels and the size of each pixel was 21.3×21.3µm2. The cross-section scanning distance was also 21.3µm2. The three dimensional image was constructed with two dimensional images. After scanning the specimen, the volume of interest(VOL) was established and two and three dimensional structures were measured. From these image layers Tb Th(trabecular thickness), Tb. SP(trabecular separation), Tb. N(trabecular number), BS/BV(bone surface density), BV/TV(bone volume fraction), SMI(structural model index) were analyzed.

Result The trabecular bone structure of specimens varied greatly depend on the sites and especially more so at the basal trabecular bone, inferior to the inferior dental nerve. Both alveolar and basal bone, a mixture of plate and rod-like structures were observed. On average alveolar bone had higher measurement of Th.T, Tb.N, Bs/Tv, but lower Tb.Sp value than basal bone.

Conclusion Alveolar bone is consisted of condensed large quantity of trabecular bone and this structural property allows effectively resist occlusal load. However, nearer to the basal bone, the has lower bone density and reduced trabecular bone.