Abstract:
Objective To evaluate the reliability of internal defect detection of bilayered lithium disilicate glass-ceramic by micro CT and 3D reconstruction techniques, in comparison with 2D morphology.
Methods Bilayered lithium disilicate glass-ceramic (IPS e.max Press, Ivoclar Vivadent) specimen was fabricated by heat-pressing on a core and hand layering a veneer. The specimen was scanned by micro CT and 3D reconstruction, and then cut into 6 pieces and observed by an optical microscope. The 2D morphology images (n= 5) were compared with the micro CT images (n= 5) on the same cross-section of the slice, and the similarity of image matching was evaluated based on gray-scale differences. Defects were analyzed in both 2D morphology and 3D reconstruction so as to observe the differences.
Results The average similarity of 2D morphology images and micro CT images was (83 ± 7.9) %. There was a difference between the 2D cross-section morphology and 3D morphology of pore defects in the bilayered lithium disilicate glass-ceramic.
Conclusion Mirco CT incorporated with 3D reconstruction is a reliable and nondestructive approach to detect and analyze the defects of bilayered lithium disilicate glass-ceramic.
Key words:
Dental porcelain,
Defect,
Reliability analysis,
Micro CT,
3D reconstruction
Zihua He, Li Dao, Yutao Jian, Xinping Zhang, Ke Zhao. Reliability analysis of internal defect detection of bilayered lithium disilicate glass-ceramic by micro CT and 3D reconstruction techniques[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2016, 10(03): 172-176.