Physical properties of self-, dual-, and light-cured direct core materials
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Stefan Rüttermann & Ian Alberts & Wolfgang H. M. Raab & Ralf R. Janda
- چاپ و سال / کشور: 2010
Description
The objective of this study is to evaluate flexural strength, flexural modulus, compressive strength, curing temperature, curing depth, volumetric shrinkage, water sorption, and hygroscopic expansion of two self-, three dual-, and three light-curing resin-based core materials. Flexural strength and water sorption were measured according to ISO 4049, flexural modulus, compressive strength, curing temperature, and curing depth according to well-proven, literature-known methods, and the volumetric behavior was determined by the Archimedesپf principle. ANOVA was calculated to find differences between the materialsپf properties, and correlation of water sorption and hygroscopic expansion was analysed according to Pearson (p<0.05). Clearfil Photo Core demonstrated the highest flexural strength (125پ}12 MPa) and curing depth (15.2پ} 0.1 mm) and had the highest flexural modulus (.12.6پ} 1.2 GPa) concertedly with Multicore HB. The best compressive strength was measured for Voco Rebilda SC and Clearfil DC Core Auto (.260پ}10 MPa). Encore SuperCure Contrast had the lowest water sorption (11.8پ} 3.3 ƒتg mm.3) and hygroscopic expansion (0.0پ}0.2 vol.%). Clearfil Photo Core and Encore SuperCure Contrast demonstrated the lowest shrinkage (.2.1پ}0.1 vol.%). Water sorption and hygroscopic expansion had a very strong positive correlation. The investigated core materials significantly differed in the tested properties. The performance of the materials depended on their formulation, as well as on the respective curing process.
Clin Oral Invest (2011) 15:597–603 DOI 10.1007/s00784-010-0405-y Received: 16 November 2009 / Accepted: 15 March 2010 / Published online: 7 April 2010
