Effect of the Composition of CAD/CAM Composite Blocks on Mechanical Properties. (23rd October 2018)

• Record Type: Journal Article
• Authors: Alamoush, Rasha A.; Silikas, Nick; Salim, Nesreen A.; Al-Nasrawi, Suhad; Satterthwaite, Julian D.
• Other Names: Landi Elena Academic Editor.
• Is Part Of: BioMed research international. Volume 2018(2018)
• Publication Date: 2018-10-23
• Subjects: Medicine -- Periodicals; Biology -- Periodicals; Biotechnology -- Periodicals; Life sciences -- Periodicals; 610.5
• DOI: 10.1155/2018/4893143
• Languages: English
• ISSNs: 2314-6133

Abstract

Abstract : The aim of this study was to evaluate the effect of the composition of CAD/CAM blocks on their mechanical properties. Nine different CAD/CAM blocks, enamel and dentine, were tested. Sixteen samples of each material were separated for Vickers microhardness test (n=6, 5 readings per specimen), nanohardness test (n=6, 5 readings per specimen), filler weight (n=3), and SEM imaging (n=1). Data were statistically analysed using one-way ANOVA. Vita Mark II ceramic showed significantly higher values of hardness (in both nano- and microscale) and elastic modulus (6.83 GPa, 502 kg/mm 2, and 47.7 GPa), respectively, than other materials. CAD/CAM composite blocks showed comparable values of hardness and elastic modulus to those of dentine but lower than those of enamel and ceramics. SEM images highlighted different filler-matrix microstructure of CAD/CAM composite blocks. It was concluded that( 1 ) hardness and elastic moduli are positively correlated with ceramic filler percentage and microstructure and( 2 ) CAD/CAM composite materials have comparable hardness and elastic moduli to tooth structure.