PMID: 18717165Aug 23, 2008Paper

Influence of polymerization mode on degree of conversion and micropush-out bond strength of resin core systems using different adhesive systems

Dental Materials Journal
Isil Cekic-NagasLippo V J Lassila

Abstract

The aim of this study was to evaluate the influence of different polymerization modes on degree of conversion and micropush-out bond strength of dual-polymerized resin core systems to dentin by using two different adhesive systems. Two resin core systems, Rebilda DC and Build-It FR, were used in combination with total-etch (Adper Scotchbond Multi-Purpose) and self-etch (Clearfil SE Bond) adhesive systems. After treatment of dentin surfaces, resin core systems were applied into the cavities and subjected to different polymerization modes as follows: (1) chemical polymerization; (2) dual polymerization with standard mode of LED (Elipar FreeLight 2 LED); or (3) dual polymerization with exponential mode of LED. The cavities (n=10 per group) were tested in a universal testing machine. Degree of monomer conversion (DC%) was determined by Fourier transform infrared spectroscopy (n=5 cavities per group). ANOVA revealed that resin core (p = 0.002), adhesive system (p < 0.001), and polymerization mode (p < 0.001) had significant effects on bond strength values. The degree of conversion for resin cores decreased significantly (p < 0.001) when only chemical polymerization was employed.

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