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Materials 2015, 8(7), 4479-4490; doi:10.3390/ma8074479

Impact Behavior of Three Notched All-Ceramic Restorations after Soaking in Artificial Saliva

1
Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan
2
Department of Dentistry, Chung Shan Medical University Hospital, Taichung City 402, Taiwan
3
School of Dentistry, Chung Shan Medical University, Taichung City 402, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Received: 10 June 2015 / Revised: 29 June 2015 / Accepted: 16 July 2015 / Published: 20 July 2015
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [1100 KB, uploaded 20 July 2015]   |  

Abstract

Biomechanics play a critical role in influencing the clinical applications of all-ceramic dental restorations. The restorative biomaterials have to demonstrate mechanical durability in the oral environment because they are always exposed to a variety of oral environments. This study was designed to evaluate the effect of soaking time, notch and saliva pH values on the impact energy of three commonly used all-ceramic materials for CAD/CAM. The leucite-reinforced glass ceramic (ProCAD), lithium disilicate glass ceramic (IPS e.max CAD) and zirconia-based ceramic materials (IPS e.max ZirCAD) were used. The experimental results indicated that the impact energy of ProCAD decreased with an increase in soaking time, but not for IPS e.max CAD and IPS e.max ZirCAD. The impact energy of the zirconia system was higher than leucite-reinforced and lithium disilicate-based ceramic systems. When subjected to preformed 0.5 mm U-shape notch on the bar specimen of 3 mm thick, the impact energy of the all-ceramic restorations revealed a markedly reduction of about 80%–90%, almost irrespective of dental compositions, which indicated the effect of flaw to a great degree. No statistically significant influence (p > 0.05) of pH values (4, 7 and 9) on impact energy was found for each group. It is concluded that the no matter which all-ceramic materials were used, it was appreciably sensitive to the presence of notches. The ceramic composition and microstructure have been shown to affect mechanical durability. View Full-Text
Keywords: all-ceramic restorations; impact energy; leucite-reinforced ceramic; lithium disilicate ceramic; zirconia; saliva all-ceramic restorations; impact energy; leucite-reinforced ceramic; lithium disilicate ceramic; zirconia; saliva
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yan, M.; Wei, C.-K.; Lin, Y.-Y.; Hu, S.-W.; Ding, S.-J. Impact Behavior of Three Notched All-Ceramic Restorations after Soaking in Artificial Saliva. Materials 2015, 8, 4479-4490.

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