Investigation of wear behavior of nanoalumina and marble dust-reinforced dental composites

Shiv Ranjan Kumar,Harlal Singh Mali,Amar Patnaik,Anoj Meena

doi:10.1515/secm-2017-0152

Abstract

Abstract In the present work, the effects of adding nanoalumina and marble dust on the wear behavior of dental composites were investigated. The hardness of dental composite was determined using Vickers micro-hardness tester. A two-body abrasive wear test was performed on the dental wear simulator under the medium of artificial saliva. The experiments were performed as per the Taguchi orthogonal array and steady state condition by varying parameters such as filler content, normal load, sliding velocity, and number of cycles. The hardness results indicated that the incorporation of 5 wt. % of nanoalumina increased the hardness of the dental composite by 12%, whereas the incorporation of 5 wt. % of marble dust increased the hardness of the dental composite by 7%. Also, for the experiments as per the Taguchi orthogonal array, the mean volumetric wear in the case of nanoalumina-filled dental composite was 9.6% less than that of marble dust-filled dental composite. However, in both the cases, the volumetric wear increased with the increase in normal load, sliding speed, and number of cycles but decreased with the increase in filler content. Analysis of variance (ANOVA) of the results indicated that normal load was less significant compared to filler content, sliding speed, and number of cycles.

Highlights

The study of wear behavior of dental materials is one of the important factors in understanding the deterioration level under clinical conditions
The hardness results indicated that the incorpo ration of 5 wt. % of nanoalumina increased the hardness of the dental composite by 12%, whereas the incorporation of 5 wt. % of marble dust increased the hardness of the dental composite by 7%
Analysis of variance (ANOVA) of the results indicated that normal load was less significant compared to filler content, sliding speed, and number of cycles

Summary

Introduction

The study of wear behavior of dental materials is one of the important factors in understanding the deterioration level under clinical conditions. Most commercial dental composite resins contain inorganic nanoparticles to achieve enhanced performance. These improvements are suggested to arise from the high specific surface area and rich surface func tional groups of the nanoparticles [20]. These nanoparticles have substantially improved composite properties including abrasion resistance, polymerization shrinkage, and mechanical strength, more progress is still needed to achieve long-term satisfactory restorations for clinical therapy [21, 22]. Utilization of marble dust in the production of new materials will help to protect the envi ronment.

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