Mechanical properties of dental restorative materials: relative contribution of laboratory tests

Abstract

wide variety of dental products that are launched on the market becomes the correct selection of these materials a difficult task. Although the mechanical properties do not necessarily represent their actual clinical performance, they are used to guide the effects of changes in their composition or processing on these properties. Also, these tests might help somehow the clinician to choose once comparisons between former formulations and new ones, as well as, with the leading brand, are highlighted by manufactures. This paper presents a review of the most important laboratory tests. In this manner, the knowledge of these tests will provide a critical opinion related to the properties of different dental materials.

Evaluation of mechanical properties of five cements for orthodontic band cementation

“…In determining CS, two axial forces are applied to the material in opposite directions, thus bringing its molecular components closer together. 21 In the present study BL cement (av. 193.88 MPa) showed statistically superior values, in comparison to other cements tested (Table 3).…”

Formation of functionalized nanoclusters by solvent evaporation and their effect on the physicochemical properties of dental composite resins

“…Following the standard specification ISO 9917 [21] for compressive strength, specimens were prepared having 8.0 mm length and 4.0 mm diameter. A two parts cylindrical mold of stainless steel was used to prepare the specimens.…”

Investigation of the correlation between the different mechanical properties of resin composites

“…Because of the complexity of loading in a clinical situation, it has been advocated that various test methods should be applied for evaluation of the mechanical performance of restorative materials 17,18) . Fracture resistance of brittle restorative materials has been frequently evaluated by measuring the flexural properties such as flexural strength and flexural modulus by a three-point bending test which has been adopted by international standards, including ISO 4049:2000 Polymer-based filling, restorative and luting materials 19) .…”

“…Generally, mastication exerts compressive loading onto dental restorations. Hence, compressive strength (CS) and diametral tensile strength (DTS) tests have been widely used to evaluate fracture resistance of resin composites due to their ease of use in specimen fabrication and testing procedure 18,21) , although they have not been adopted by ISO 4049. Vickers and Knoop microhardness (HV and HK) tests are simple methods for testing the surface mechanical properties and they have long been used to evaluate the degree of conversion, wear rate of resin composites and other physical properties of dental resin composites.…”