Reliability analysis of internal defect detection of bilayered lithium disilicate glass-ceramic by micro CT and 3D reconstruction techniques

doi:10.3877/cma.j.issn.1674-1366.2016.03.004

Chinese Journal of Stomatological Research(Electronic Edition) ›› 2016, Vol. 10 ›› Issue (03): 172-176. doi: 10.3877/cma.j.issn.1674-1366.2016.03.004

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Reliability analysis of internal defect detection of bilayered lithium disilicate glass-ceramic by micro CT and 3D reconstruction techniques

Zihua He¹, Li Dao¹, Yutao Jian², Xinping Zhang³, Ke Zhao¹^,^†()

^1. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China; Guangdong Engineering Research Center of Technology and Materials for Oral Restoration and Reconstruction, Guangzhou 510080, China
^2. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
^3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Received:2016-02-07 Online:2016-06-01 Published:2016-06-01
Contact: Ke Zhao
About author:
Corresponding author: Zhao Ke, Email: zhaoke@mail.sysu.edu.cn

Abstract

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.

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Figures/Tables 6

References 13

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