Friction and Wear Behavior of Selected Dental Ceramics

Abstract

The purpose of this study was to determine the friction coefficients and wear rates of six commercially available dental ceramics including IPS Empress 2 (E2), Cergo Pressable Ceramic (CPC), Cercon Ceram (CCS) and Super porcelain EX-3 (SPE). Bovine enamel (BE) was also tested as a reference material for comparison purposes. Samples of the dental ceramics were prepared according to the instructions described by the manufacturers in disk-shape with nominal dimensions of 12 mm × 2 mm. The wear tests were performed by means of a pin-on-disk type tribometer. The friction coefficients and specific wear rates of the materials were determined at a load of 10 N and rotating speed of 0.25 cm/s without lubrication. Surface morphology of the wear tracks was examined using a scanning electron microscope. Statistical analyses were made using one-way ANOVA and Turkey's HSD (P < 0.05). Surf. Rev. Lett. 2009.16:653-661. Downloaded from www.worldscientific.com by MCGILL UNIVERSITY on 02/05/15. For personal use only.

Wear Potential of Dental Ceramics and its Relationship with Microhardness and Coefficient of Friction

“…Hardness is a characteristic that has long guided many dentists in the material selection process; however, a direct relationship between hardness and wear cannot always be established, due the multifactorial nature of the wear process . The Vickers microhardness values found in this study were similar to those reported elsewhere, and no differences were demonstrated between the analyzed ceramics. We thus conclude that the results of the other tests carried out in this study were not related to microhardness …”

“…The images obtained in this study can be used for comparative analyses with other investigations. Park et al tested Empress ceramic specimens with an opposing zirconia sphere and reported extremely similar scratching in the contacting surfaces of the two materials, with only slight scratches. In the same study, dentin‐layer Noritake ceramics exhibited cracks similar to those found in the present investigation.…”

“…Furthermore, in the present study, there was a substantial difference between the coefficients of Noritake and Eris specimens. It is interesting to note that the coefficient of friction measurements obtained for Eris ceramic can be compared to those found in In‐Ceram …”

“…It is essential to define which factors can influence the frictional behavior of a material and thus affect its performance. Microhardness testing and descriptive analysis of the surface are important steps in analysis of the obtained data …”

“…Microhardness testing and descriptive analysis of the surface are important steps in analysis of the obtained data. 2,8,11,12,18,19 POD testing for derivation of coefficients of friction (μ) was performed in accordance with ASTM G99. 20 Briefly, the specimen is secured on a holder, and a load is applied with a pin (in this study, a sphere).…”