Influence of Alumina Air-Abrasion on Flexural and Shear Bond Strengths of CAD/CAM Composite

Pirat Karntiang,Hiroshi Ikeda,Hiroshi Shimizu,Yuki Nagamatsu

doi:10.3390/cryst10100927

Abstract

The purpose of this study was to clarify the influence of alumina air-abrasion on flexural and bond strengths of CAD/CAM composites. The flexural strength (FS) of two brands of commercial CAD/CAM composites was investigated by the three-point bending test using two specimen designs: the single-bar according to the ISO standard and the bonded-double-bar fabricated by bonding two bars with a resin cement. The bond strength between the composites and the resin cement was measured by a conventional shear bond strength (SBS) test. The FS of single-bar specimens was significantly decreased by the air-abrasion. For the FS of the bonded-double-bar specimen, on the other hand, there was no significant difference between the specimens with/without air-abrasion. The SBS for the composites was significantly increased by air-abrasion. The results suggest that alumina air-abrasion improves the SBS of the composites while weakening its FS. Contrarily, the FS of the air-abraded composite did not decrease when the composites were bonded with the resin cement.

Highlights

Computer-aided design/computer-aided manufacturing (CAD/CAM) is gaining more popularity amongst dental fields around the world
Tooth-colored esthetic materials used for the CAD/CAM system were categorized into two types including ceramic and resin composite [5,6,7]
The present study aimed to investigate the influence of the alumina air-abrasion both with and without the artificial aging process or thermocycling on the flexural strength and bond strength of the CAD/CAM composite using two brands of commercially available ones

Summary

Introduction

Computer-aided design/computer-aided manufacturing (CAD/CAM) is gaining more popularity amongst dental fields around the world. The precision of the CAD/CAM system is comparable to other fabrication techniques [1,2,3,4]. The materials used for the CAD/CAM system have developed, there are varieties of material to choose from. Tooth-colored esthetic materials used for the CAD/CAM system were categorized into two types including ceramic and resin composite (thereafter composite) [5,6,7]. Since the first introduction of CAD/CAM composites in the market, Paradigm MZ100 (3M ESPE) in 2010, the materials have been improved so far in every aspect including their mechanical properties [5,6,8,9]. Some of the CAD/CAM composites have flexural strength reaching 300 MPa

Objectives

Discussion

Conclusion