Comparative Evaluation of Mechanical Properties and Wear Ability of Five CAD/CAM Dental Blocks.

Yin Yin,Lee Lee,Bae Bae,Jang Jang

doi:10.3390/ma12142252

Abstract

This study compares the mechanical properties and wear ability of five CAD/CAM (computer-aided design/computer-aided manufacturing) millable dental blocks. All the discs, including Amber Mill Hybrid, Vita Enamic, Katana Avencia, Lava Ultimate, and Amber Mill, were cut in dimensions of 1.2 mm in thickness and 12 mm in diameter, polished to a machined surface, and immersed in distilled water for seven days. Vickers hardness was measured and the indentations were observed using microscope. The discs were brushed under a 150 g load. Mean surface roughness (Ra) and topography were determined after 100,000 cycles. Finally the biaxial flexure strength of the discs was measured and the broken surfaces were observed using scanning electron microscopy (SEM). The data was subjected to Weibull analysis. All data were analyzed by one-way analysis (ANOVA). The results of Vickers hardness are shown as: Amber Mill > Vita Enamic > Amber Mill Hybrid > Lava Ultimate > Katana Avencia. Katana Avencia showed the highest volume percentage reduction and the roughest surface after toothbrushing. The biaxial flexural strength is shown as: Amber Mill > Katana Avencia > Lava Ultimate > Amber Mill Hybrid > Vita Enamic. All the tested materials exhibited varying degrees of mass loss and surface roughness. The properties of the composite materials are related to the filler content, filler volume, and polymerization methods.

Highlights

The past three decades have witnessed significant advances in both dental restorative materials and dental restorative technology
The properties of the composite materials are related to the filler content, filler volume, and polymerization methods
There are three main types of dental block materials used under clinical conditions, which can be aesthetically processed by computer-aided design/computer-aided manufacturing (CAD/CAM): Ceramics, glass ceramics, and resin composites [1]

Summary

Introduction

The past three decades have witnessed significant advances in both dental restorative materials and dental restorative technology. Ceramics require additional processing such as specialized sintering and glazing after grinding [2,3], while glass ceramics and resin composites conveniently do not require these steps and can be quickly fabricated directly with oral clinical-use equipment [4]. In this context, it has been reported in several studies that traditional ceramics such as zirconia have high mechanical strength and excellent wear resistance against contact with teeth [5,6]. Some studies have reported that their large surface wear, relatively

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