Influence of Contact Stress, Sliding Velocity, and Surface Roughness on the Sliding Wear of a Composite Restorative

Abstract

The influence of several experimental parameters on the sliding-wear behavior of a composite restorative has been examined. The results demonstrate that: 1) Changes in surface finish and sliding velocity have little effect on the moderate wear-rate observed at nominal levels of stress, and 2) increased contact stress can profoundly alter wear mechanisms and produce marked surface failure at levels well within the range associated with human mastication.

Relationship Between Subsurface Damage and Wear of Dental Restorative Composites

“…According to the recent results of Composite A of Bailey et al, 10 increasing the stress from 10 to 15 MPa on enamel pins produces severe damage accompanied by catastrophic wear. In going from the low to high stresses above, the wear rates increased by something like a factor of 2000.…”

“…-All specimens were prepared from the commercial dental composite restorative designated here as Composite A,*t which consists of a BIS-GMA-based resin with a quartz reinforcing filler. The restorative was Received for publication August 18,1981 Accepted for publication December 10,1981 This work was supported by Interagency Agreement No. YO1-DE-40015 from the National Institute of Dental Research.…”

“…Fig. 9 is a micrograph showing the wear on Composite A after 9300 cycles, or six h, using a stainless steel pin at 10 MPa stress. Wear is observed with essentially no damage except near the edge of the wear track, where damage is apparent at earlier times.…”

Tooth Wear

“…focussing either on attrition or abrasion. Two-body tests for restorative materials either use human enamel [26] or a hard material, such as alumina [27] or steatite [28], as the abrader. For three-body tests, an abrasive medium, such as toothpaste slurry [29,30], or an abrasive food, such as rice or millet seeds [31,32], is typically used.…”

Influence of Enamel Stylus Stiffness on the Sliding-wear Behavior of a Composite Restorative

“…[6][7][8] In the present work, the wear characteristics of a polymeric composite* in sliding contact with a stylus fashioned from human enamel were evaluated as a function of the stiffness of the stylus-restorative contact. Recent investigations9 have shown that the stiffness parameter is important in structural vibration, machining, and other mechanical processes which contribute to wear.…”