Microstructure of crown dental hard tissue of premolars observed by 3D laser scanning microscope
XU Li-xia
XU Hong-mei
GUO Hong-yan
GUO Hong-mei
SUN Li-mei
Abstract：AIM:To investigate the microstructure of enamel,dentin and dentin -enamel junction (DEJ), and to analyze the relationship between the microstructure and the function of premolars by 3D laser scanning micro-scope(3DLSM).METHODS:10 freshly extracted human premolars were divided into transverse section group(group A,n =5)and longitudinal section group (group B,n =5)and were examined under 3D LSM.RESULTS:In group A enamel surface morphology showed that the crystals of enamel rods were closely aligned,enamel rod sheath gap was clearly visible and curved boundary was continuous.While in group B,the crystals of enamel rods were closely ar-ranged,enamel rod sheath was clear and continuous.For dentin surface morphology,many openings of dentin tubule could be found,lumen was clear and tube wall was surrounded with peritubular dentin and the other parts were surroun-ded with intertubular dentin in group A.Whereas in group B,dentin tubule was streakily arranged throughout the dentin layer,and was lined with many branches.As for surface morphology of DEJ,hydroxyapatite crystals formed a scalloped shape with its convexities directed toward the dentin and concavities directed toward the enamel in both groups,but the shape was more apparent in group A.CONCLUSION:The organizational structure of crown dental hard tissue is closely related to its function.
Keywords：enameldentindentin -enamel junction3D laser scanning microscope
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 423-426,430 )