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Reciprocating wear test of dental composites against human teeth and glass
Ramalho, A.; Antunes, P. ValeThe complexity of the contact in the mouth leads to an interplay of sliding wear, abrasion and fatigue, independently of the surfaces in contact, which involve either tooth-to-tooth or tooth-to-restoration. Since this is a complex problem and in vivo tests are expensive, much time consuming and the generalization of the attained results very complex, in vitro simulations are the usual research approach. ; ht...
Reciprocating wear test of dental composites: effect on the antagonist
Ramalho, A.; Antunes, P. ValeResin composites were first introduced as anterior restorative materials, but are more and more used in posterior teeth, as amalgam replacements. Nowadays the so-called [`]condensable' composites are frequently used in posterior teeth. These materials are subjected to high values of contact and mastigatory loads, loading rates and sliding distances. In such contact conditions, wear is the major failure mode of ...
Fretting behaviour of glass-fibre-reinforced polypropylene composite against 20...
Antunes, P. Vale; Ramalho, A.Composite materials, mainly fibre type ones, are used to respond to crucial demands in engineering applications. Various limitations mean that it is usually impossible to produce structures without mechanical joints. Fretting is an important failure mode for such joints, especially for dynamic loads. This paper sets out to assess the influence of this failure mode--fretting--in association with the effect of di...
Study of abrasive resistance of composites for dental restoration by ball-crate...
Antunes, P. Vale; Ramalho, A.Two-body abrasion occurs in the mouth whenever there is tooth-to-tooth contact. This is what most dentists call attrition. Abrasive wear may also occur when there is an abrasive slurry interposed between two surfaces, such that the two solid surfaces are not actually in contact, this is called three-body abrasion, with food acting as the abrasive agent, and occurs in the mouth during mastication. Abrasion is th...
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