ABSTRACT
The aim of this study was to measure the degree of conversion [DC] of three types of composite resins [micro-hybrid, nano-hybrid and Ormocer] with different light curing units [LED LCU and QTH LCU] in two depths. Three commercially available dental resin composites were used in this study: [Tetric Ceram, Ivoclar Vivadent, Liechtenstein-A2 shade], [Tetric Evoceram, Ivoclar Vivadent, Liechtenstein-A2 shade], [Ceram X, Dentsply, Germany-M[2] shade]. Specimens were divided into two groups, 5 specimens were photo-activated by QTH unit [Coltolux 75-Colten] and the other five specimens were cured by LED [Demi-Kerr]. Then each specimen was sectioned at the top surface and at 2-mm depth. The DC was measured by FT-IR [Bruker-tensor 27]. The data were analyzed by 3-way ANOVA test. There was significant difference between tested composite resins [P<0.001]. The results of top surfaces were significantly different from those observed at 2-mm depth [P<0.001]. The type of curing unit affected the polymerization of Ceram X resin composite. This study showed a significant difference in the degree of conversion in different thicknesses within three groups of resin composites
Subject(s)
Organically Modified Ceramics , Curing Lights, Dental , Light-Curing of Dental AdhesivesABSTRACT
Background and Aim: Equipments and surfaces in dental clinics and centers are always in risk of contamination. When there is no possibility of sterilizing them, fast acting disinfecting agents are used. In this study, antibacterial effect of a new disinfecting solution, named Nanex,against streptococcus mutans and pseudomonas aeroginosa was compared with pure Nano silver solution and Deconex 53 plus
Materials and methods: In this experimental study, in order to determine the effective antibacterial concentration , serial dilution technique ,evaluation of [MIC] and [MBC] were used. Finally bacterial growth was assessed
Results: The # 4 solution [containing 100 ppm Nano silver and 2% Deconex] showed the least MIC and MBC for streptococcus mutans. The # 7 solution [containing 133 ppm Nano silver and 1% Deconex] showed the least MIC and MBC for psuedomonas aerogenosa
Conclusion: Thus, antibacterial effect of Nanex solution was more potent and effective than pure solution of nano silver and deconex