Attrition may be defined as the physi- ologic wearing away of tooth structure as a result of tooth-to-tooth contact, as in mastication, with possible abrasive sub- stance intervention (Eccles3). Lesions due to attrition are most commonly observed to occur on the incisal and occlusal con- tacting surfaces. The early clinical mani- festation of attrition is the appearance of a small polished facet on the cusp or ridge, or the slight flattening of an incisal edge. As the lesion progresses, there is a tendency towards the reduction of the cusp height and flattening of the occlusal inclined planes, with concomitant dentine exposure