The Influence of Testing Protocols on Microhardness Tests of ...
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The Influence of Testing Protocols on Microhardness Tests of ...
which have a greater amount of load and are less susceptible to wear [4,5]. ... submitted to knoop or vickers microhardness using different testing protocols.
The Influence of Testing Protocols on Microhardness Tests of Composite Resin with Different Viscosities Eduardo Gonçalves Mota, Roberta Limeira Fulginiti, Daniela Loureiro Prietsch, Gustavo Frainer Barbosa, Hugo Mitsuo Silva Oshima Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Abstract This study tested two hypotheses. The first null hypothesis affirms that there is no statistical difference when composite resin is submitted to knoop or vickers microhardness using different testing protocols. The second hypothesis tested the possible influence of elastic modulus of composite resin in microhardness tests. Two nanohybrid composites were used with different viscosity behavior (Grandio and Grandio Flow). Samples (n=540) were made with 4 mm diameter and 2 mm high using a PTFE mould, stored for 24h at 37°C protected from light and randomly divided into 36 groups according to the resin viscosity (medium and low), microhardness methodology (vickers or knoop), load (50, 100 or 500g) and time (15, 30 or 45s). Two readings were made at the light exposed surface of each sample with Shimadzu HMV tester accomplishing 1.080 indentations. The vickers and knoop results were submitted to a three-way ANOVA with fixed factors the composite viscosity, load and time, and the post-hoc Tukey multiple comparison test at α=0.05. Significant differences were recorded (p
