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Effects of aluminum oxide addition on the flexural strength, surface hardness, and roughness of heat-polymerized acrylic resin

2012; Elsevier BV; Volume: 7; Issue: 3 Linguagem: Inglês

10.1016/j.jds.2012.05.008

2213-8862

Mahroo Vojdani, Rafat Bagheri, Amir Ali Reza Khaledi,

Dental Trauma and Treatments

Background/purpose: Acrylic dentures frequently fracture during service due to their poor strength characteristics. The aim of this study was to evaluate the effects of adding 0.5e5 wt% aluminum oxide (Al2O3) powder on the flexural strength, surface hardness, and roughness of a conventional heat-polymerized acrylic resin. Materials and methods: In total, 50 specimens were prepared for each test. Specimens were divided into five groups (n Z 10) coded A to E. Group A was the control group (without adding Al2O3). Specimens in the other four groups (BeE) were reinforced with Al2O3 at loadings of 0.5, 1, 2.5 and 5 wt%. Flexural strength was assessed with a three-point bending test using a universal testing machine. Hardness testing was conducted using a Vickers hardness tester. A surface-roughness test was performed with a profilometer. Results: Data analyses using analysis of variance and Tukey'shonest significant difference tests showed that adding 2.5 wt% Al2O3 significantly increased the flexural strength compared to the control group (P Z 0.000). The Vickers hardness significantly increased (P 0.05) was detected in surface- roughness levels between the reinforced and control groups.