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

Materials

Min Yan²  Chung-Kai Wei¹  Yuh-Yih Lin¹  Suh-Woan Hu²  Shinn-Jyh Ding² 

[1] Department of Dentistry, Chung Shan Medical University Hospital, Taichung City 402, Taiwan; E-Mails:;Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan; E-Mails:

关键词: all-ceramic restorations;    impact energy;    leucite-reinforced ceramic;    lithium disilicate ceramic;    zirconia;    saliva;   

DOI  :  10.3390/ma8074479

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.