Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (34): 5427-5431.doi: 10.12307/2021.234

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Microstructure and mechanical properties of the new dental glass ceramics with different formulations

Ren Shipeng1, Chen Xinmin2, Qing Song1, Yu Jie1, Yang Ting1, Tang Wanrong1   

  1. 1Department of Stomatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China; 2Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610000, Sichuan Province, China
  • Received:2020-06-09 Revised:2020-06-13 Accepted:2020-09-05 Online:2021-12-08 Published:2021-07-28
  • Contact: Tang Wanrong, Master, Associate chief physician, Department of Stomatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China
  • About author:Ren Shipeng, Master, Attending physician, Department of Stomatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China
  • Supported by:
    the Nanchong City School Cooperation Project, No. 19SXHZ0350 (to TWR); the North Sichuan Medical College-Level Scientific Research Project, No. CBY17-A-YB48 (to YJ)

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Abstract: BACKGROUND: Through adjusting the base glass elements and process system, glass-ceramic with specific features can be expected to obtain. 
OBJECTIVE: To prepare a self-formulated lithium disilicate glass-ceramic, and determine their mechanical properties and microstructures after crystallization. 
METHODS: Using lithium disilicate as the basic composition of glass, G1, G2, and G3 glass base bodies were fabricated with different formulations by melting method. After burnishing and polishing, relative surface was kept parallel. The glass base bodies of No. G1, G2, and G3 were prepared by crystallization heat treatment (increase the temperature to 606 °C for 30 minutes, then 880 °C in speed of 10 °C/min as keeping the temperature for 30 minutes). The glass was burnished, polished, and dried. The glass base body of No. G1 without crystallization heat treatment was set as blank control. The bending strength, elastic modulus, Knoop hardness and microstructure of each group of glass-ceramic were measured in each group. 
RESULTS AND CONCLUSION: (1) The bending strength and elastic modulus of G1, G2, and G3 glass ceramics were significantly higher than those of blank control group (P < 0.05), and there was no significant difference in bending strength and elastic modulus of G1, G2, and G3 glass ceramics (P > 0.05). (2) The Knoop hardness of G1, G2, and G3 glass ceramics was significantly higher than that of blank control group (P < 0.05), and there was no significant difference in Knoop hardness of G1, G2, and G3 glass ceramics (P > 0.05). (3) The results of scanning electron microscopy showed that the main crystal phase of G1, G2, and G3 glass ceramics was lithium disilicate, but the microstructures of those glass ceramics were changed by adjusting the processing formula. G1 and G3 glass ceramics have similar microstructure. The crystalline forms of the samples were rodlike crystals with uniform size and high crystal content. The crystalline form of G2 was flakes, inhomogeneous in size, and high in crystal content. (4) The results showed that the mechanic performance of this new type of glass-ceramic is close to IPS e.max Press, and it is a repair material with promising future.

Key words: material, glass-cerami, lithium disilicate, glass embryo body, crystallization, mechanic performance, microstructure

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