Abrasive wear behaviour of machinable lithium disilicate glass ceramic

Pushparatnam, Samuel, Peng, Zhongxiao, Wu, Jingping, and Yin, Ling (2014) Abrasive wear behaviour of machinable lithium disilicate glass ceramic. In: Proceedings of the 8th Australasian Congress on Applied Mechanics. From: ACAM 8: 8th Australasian Congress on Applied Mechanics, 23-26 November 2014, Melbourne, VIC, Australia.

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Wear properties of dental ceramics play a vital role in dental restorations which undergo a wear process during mastication. This paper reports on initial surface roughness and load effects on the abrasive wear behaviours of a machinable lithium disilicate glass ceramic (MLDGC) with high strength and aesthetic attractiveness. MLDGC specimens with different surface roughness were prepared by polishing using diamond pastes with different grit sizes. Wear testing was conducted on a pin-on-disc friction rig at 5 N and 25 N loads and a sliding speed of 2.5 mm/s over 20 m in dry conditions. Wear tracks and morphologies were quantitatively measured using 3D laser scanning microscopy. The results show that initial surface roughness played a significant role in controlling coefficients of friction only at the low load of 5 N, while it significantly affected the wear volumes in terms of cross sectional wear areas only at the high load. Meanwhile, wear-induced surface roughness changes were significantly influenced by the initial surface roughness at both low and high loads. This research indicates that proper surface preparation of MLDGC is crucial in the prolonging of the life spans of MLDGC restorations.

Item ID: 38539
Item Type: Conference Item (Research - E1)
ISBN: 978-1-922107-35-0
Keywords: friction coefficient, lithium disilicate glass ceramic, load effect, roughness, wear rate
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Date Deposited: 19 May 2015 21:58
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 20%
86 MANUFACTURING > 8610 Ceramics, Glass and Industrial Mineral Products > 861002 Ceramics @ 80%
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