Abstract
ObjectivesThe primary aim of this research was to investigate the wear behavior and wear mechanism of five different veneering porcelains.MethodsFive kinds of veneering porcelains were selected in this research. The surface microhardness of all the samples was measured with a microhardness tester. Wear tests were performed on a ball-on-flat PLINT fretting wear machine, with lubrication of artificial saliva at 37°C. The friction coefficients were recorded by the testing system. The microstructure features, wear volume, and damage morphologies were recorded and analyzed with a confocal laser scanning microscope and a scanning electron microscope. The wear mechanism was then elucidated.ResultsThe friction coefficients of the five veneering porcelains differ significantly. No significant correlation between hardness and wear volume was found for these veneering porcelains. Under lubrication of artificial saliva, the porcelain with higher leucite crystal content exhibited greater wear resistance. Additionally, leucite crystal size and distribution in glass matrix influenced wear behavior. The wear mechanisms for these porcelains were similar: abrasive wear dominates the early stage, whereas delamination was the main damage mode at the later stage. Furthermore, delamination was more prominent for porcelains with larger crystal sizes.SignificanceWear compatibility between porcelain and natural teeth is important for dental restorative materials. Investigation on crystal content, size, and distribution in glass matrix can provide insight for the selection of dental porcelains in clinical settings.
Highlights
IntroductionPorcelains have been widely used for dental restoration because of their excellent aesthetics, durability, and biocompatibility [1]
Porcelains have been widely used for dental restoration because of their excellent aesthetics, durability, and biocompatibility [1]. Their use in clinical settings is limited by their susceptibility to fracture and excessive wear of opposing teeth [2]. Several porcelains such as feldspathic porcelain, glass-ceramics, glass-infiltrated aluminia, and zirconia are largely used as dental prosthetic materials for obtaining different restorative effects [3, 4]
Previous research reported that the mechanical property of dental porcelain was influenced by many factors, including microstructures, surface roughness, chemical composition, and mechanical features [6, 9, 10]
Summary
Porcelains have been widely used for dental restoration because of their excellent aesthetics, durability, and biocompatibility [1] Despite these advantages, their use in clinical settings is limited by their susceptibility to fracture and excessive wear of opposing teeth [2]. Their use in clinical settings is limited by their susceptibility to fracture and excessive wear of opposing teeth [2] Several porcelains such as feldspathic porcelain, glass-ceramics, glass-infiltrated aluminia, and zirconia are largely used as dental prosthetic materials for obtaining different restorative effects [3, 4]. Jr [10] reported that the composition generated the microstructure and effected the mechanical property of the porcelain.
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