Abstract
As a veneering porcelain coating of dental prosthesis, two-body and three-body wear behavior of dental glass-ceramic with the main crystalline phase of fluorapatite has not been comprehensively studied. In this work, a self-made fluorapatite glass-ceramic was synthesized and the mechanical and tribological performances of the glass-ceramic were tested, comparing with a commercial feldspathic glass-ceramic. The friction and wear experiments were performed between disk-shaped glass-ceramics and natural teeth in two-body (dry, water, saliva) and three-body (slurry) modes, respectively. Results showed that good mechanical properties of fluorapatite glass-ceramic can be achieved by the sintering process. In both two-body and three-body modes, the fluorapatite glass-ceramic had a smaller friction coefficient and wear rate and caused less damage on antagonistic teeth than the feldspathic glass-ceramic. The greater mechanical properties give fluorapatite glass-ceramic a better wear resistance and reduce the adhesive wear.
Highlights
There has been an increase in the application of ceramic restorative materials in dentistry [1,2].Fluorapatite glass-ceramics and feldspathic glass-ceramic are usually used as veneering porcelain coatings on the zirconia or other base ceramics because of their excellent esthetics and biocompatibility [3]
The relatively low mechanical performance of the glass-ceramic compared with zirconia and other base ceramics often leads to excessive wear and fractures [4,5]
In order to evaluate the performance of the glass-ceramic, the glass-ceramic was not coated on the zirconia or other base ceramics and was fabricated in disk and bar shapes
Summary
There has been an increase in the application of ceramic restorative materials in dentistry [1,2]. Fluorapatite glass-ceramics and feldspathic glass-ceramic are usually used as veneering porcelain coatings on the zirconia or other base ceramics because of their excellent esthetics and biocompatibility [3]. The relatively low mechanical performance of the glass-ceramic compared with zirconia and other base ceramics often leads to excessive wear and fractures [4,5]. Wear is the gradual removal of material as consequence of interaction between surfaces moving in contact, and sometimes induces surface microcrack, which may cause fractures of the ceramic [6]. The ideal prosthetic material, which has a high level of wear resistance, can withstand long-term masticatory pressure, while minimizing the wear of the opposing teeth [7]. There are many factors influencing the wear behavior, such as the properties of the material, the abrasive nature of food, the lubrication environment, and the individual chewing behavior [5,8]
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