8-2006-Friction and wear behavior of dental feldspathic porcelain.pdfVIP

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8-2006-Friction and wear behavior of dental feldspathic porcelain.pdf

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8-2006-Friction and wear behavior of dental feldspathic porcelain

Ar ( w m r l w n h ? K 1 a t l [ a e t o o a c i i 0 dWear 261 (2006) 611–621 Friction and wear behavior of dental feldspathic porcelain H.Y. Yu a,b, Z.B. Cai a, P.D. Ren a, M.H. Zhu a, Z.R. Zhou a,? a Tribology Research Institute, Key Laboratory of Advanced Technologies of Materials, Southwest Jiaotong University, Chengdu 610031, PR China b West China College of Stomatology, Sichuan University, Chengdu 610041, PR China Received 13 October 2004; received in revised form 15 December 2005; accepted 24 January 2006 Available online 23 March 2006 bstract The friction and wear behavior of dental feldspathic porcelains against uniform Si3N4 balls has been investigated using a small amplitude eciprocating apparatus under simulated oral conditions. The variables of load (10–40 N), reciprocating amplitude (100–500 m), frequency 1–4 Hz) and use of artificial saliva lubrication were selected. Tests lasting up to 10,000 cycles were conducted. The bonded-interface technique as introduced into the wear test for the subsurface damage evaluation. Special attention was paid to the effects of friction conditions of tests, aterial properties and wear mechanism of dental porcelains. The results show Vita VMK95 possesses a lower friction coefficient and better wear esistance than Cerec Vitablocs MarkII. Among three parameters of the tests on the friction coefficient and wear depth of dental porcelains, the oad effect is prominent. Artificial saliva plays an important role in lowering the friction coefficient and wear loss of dental porcelains. Abrasive ear is the main wear mechanism for both, but brittle cracks and delaminations are more frequent for Cerec Vitablocs MarkII, especially under on-lubricated friction. Surface brittle cracks are more dominant in low sliding cycles while subsurface cone or lateral cracks are prominent in igh sliding cycles. 2006 Elsevier B.V. All rights reserved. face t F m e o e t r [ t o t m geywords: Dental porcelains; Friction and wear; Sliding contact;