Abstract
Aims: To assess the relationship between 2-body and 3-body wear for a wide variety of dental restorative materials and the suitability of using Relative Dentine Abrasivity (RDA) as a means of judging abrasivity of dentifrice pastes against these materials. Design and methods: 2-body wear tests were performed using steatite ceramic as antagonist. 3-body wear tests were performed using a variety of dentifrice pastes having a wide range of RDA values. Some 3-body tests were combined with an element of acid erosion by conditioning specimens in orange juice (pH 3.8). All tests were performed in vitro. Results and conclusions: RDA was not a reliable indicator of dentifrice abrasivity across the full range of restorative materials. Wear of resin-based materials by toothpastes can loosely be predicted from RDA but the relationship breaks down when glass ionomers are included. There is no relationship between 2-and 3-body wear. Glass ionomers perform badly under 2-body conditions but are quite resistant to 3-body wear. Glass ionomers were the only materials for which acid erosion in orange juice caused a significant increase in the rate of 3-body wear. The rate of 3-body wear was positively correlated with surface roughening.
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