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. 2015 May 18;10(5):e0126896.
doi: 10.1371/journal.pone.0126896. eCollection 2015.

Effect of heat-pressing temperature and holding time on the microstructure and flexural strength of lithium disilicate glass-ceramics

Fu Wang  1 , Zhiguo Chai  2 , Zaixi Deng  3 , Jing Gao  2 , Hui Wang  2 , Jihua Chen  2
Affiliations

Effect of heat-pressing temperature and holding time on the microstructure and flexural strength of lithium disilicate glass-ceramics

Fu Wang et al. PLoS One. .

Erratum in

Abstract

The present study aimed to evaluate the influence of various heat-pressing procedures (different holding time and heat pressing temperature) on the microstructure and flexural strength of lithium disilicate glass ceramic. An experimental lithium silicate glass ceramic (ELDC) was prepared from the SiO2-Li2O-K2O-Al2O3-ZrO2-P2O5 system and heat-pressed following different procedures by varying temperature and holding time. The flexural strength was tested and microstructure was analyzed. The relationships between the microstructure, mechanical properties and heat-pressing procedures were discussed in-depth. Results verified the feasibility of the application of dental heat-pressing technique in processing the experimental lithium disilicate glass ceramic. Different heat-pressing procedures showed significant influence on microstructure and flexural strength. ELDC heat-pressed at 950℃ with holding time of 15 min achieved an almost pore-free microstructure and the highest flexural strength, which was suitable for dental restorative application.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Graphical presentation of dental heat-pressing equipment.
Fig 2
Fig 2. X-ray diffraction patterns of experimental lithium disilicate glass ceramic.
(a) before heat-pressing. (b) after heat-pressing at 950°C. No change in crystalline compositions was observed. Lithium disilicate (Li2Si2O5) was represented as the major crystalline phase. The intensity of the main diffraction peak increased after heat-pressing (b).
Fig 3
Fig 3. SEM photographs of the etched polished surface of lithium disilicate glass ceramics.
(a) before heat-pressing, (b) heat-pressed at 950°C, (c) heat-pressed at 960°C, (d) heat-pressed at 970°C, (e) heat-pressed at 980°C. Crystal size of ELDC showed a small extent of growth as heat-pressing temperature increased and crystal alignment along the direction of pressing was observed in the heat-pressed specimens.
Fig 4
Fig 4. SEM images of polished surface of experimental glass ceramics.
(a) heat-pressed at 950°C, (b) heat-pressed at 960°C, showing almost no pores; (c) heat-pressed at 980°C, showing distribution of some spherical pores.
See this image and copyright information in PMC

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Grants and funding

1. Funding was provided by National Natural Science Foundation of China (51472269). WF, http://isisn.nsfc.gov.cn/egrantweb/. 2. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.