Abstract
The cementation of thin ceramic veneers employing fluid light-activated resin-based materials is a common procedure in the dental practice. Aim: To evaluate the influence of ceramic thickness and shade on the degree of conversion (DC) of a flowable light-activated material. Methods: flowable resin composite (Tetric N-Flow - shade A1) was light-activated through ceramic discs of two shades (IPS Classic - A1 and A3) in three thicknesses (0.5, 0.7 and 1.0 mm). For control, the resin composite was light-activated without ceramic interposition. DC was evaluated by FTIR (n=5). Data were analyzed by one-way ANOVA and Dunnett's T3 test (α=0.05). Results: Statistically significant differences between groups were observed (p<0.001). Control group (without the interposition of ceramic) showed the highest mean for DC (71.9± 1.7). Considering the interposed ceramic disc groups, the highest DC values were obtained when 0.5 and 0.7 mm A1 ceramics were used (64.6±1.2 and 64.4 5.0, respectively) and the lowest DC values were obtained for 0.7 and 1 mm A3 ceramics (61.74±0.9 and 62.0±1.9, respectively). Conclusions: No flowable resin composite group with interposing ceramics reached a DC similar to the control group.
Highlights
IntroductionDental ceramics have become well known due their great esthetic quality, capacity of mimicking the dental structure, high wear and staining resistances, color stability and biocompatibility[1]
Received for publication: August 31, 2015 Accepted: September 26, 2015Dental ceramics have become well known due their great esthetic quality, capacity of mimicking the dental structure, high wear and staining resistances, color stability and biocompatibility[1]
Despite the superior physical-chemical properties of ceramic materials when compared to other dental esthetic restorative materials, such as resin composites, the clinical success of ceramic restorations depends on the properties of the cementation material as well as the cementation technique[2]
Summary
Dental ceramics have become well known due their great esthetic quality, capacity of mimicking the dental structure, high wear and staining resistances, color stability and biocompatibility[1]. It is well established that ceramic veneers should be firmly fixed to dental structure in order to achieve better clinical longevity. Despite the superior physical-chemical properties of ceramic materials when compared to other dental esthetic restorative materials, such as resin composites, the clinical success of ceramic restorations depends on the properties of the cementation material as well as the cementation technique[2]. Luting materials are considered clinically acceptable if they present appropriate resistance to solubilization, high adhesion to dental substrates, high strength under tension, good manipulative properties, and biocompatibility in the oral environment and to the dental tissues[2,3]. One of the most important aspects related to the characteristics of resin-based materials is the
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