Research and EducationEffect of previous photoactivation of the adhesive system on the color stability and mechanical properties of resin components in ceramic laminate veneer luting
Section snippets
Material and Methods
The materials used in this study are listed in Table 1. This study was approved by the Ethics Committee of the Araçatuba School of Dentistry, São Paulo State University (#2015-00673).
Forty-four lithium disilicate slices (7×8×0.6 mm) were made from high-translucency lithium disilicate blocks, shade B1 (IPS e.max CAD; Ivoclar Vivadent AG), using a low-speed diamond saw under water cooling (IsoMet 5000; Buehler). The ceramic slices were sintered in the manufacturer's furnace (Programat EP 5000;
Results
Table 2 shows the analysis of the color stability, which revealed no differences between the polymerization lights under the same experimental conditions (P>.05). After 252 hours of aging, the group with no previous photoactivation exhibited more chromatic alteration of the dental enamel than the group that was previously polymerized using Valo polywave (P=.023). There was more chromatic alteration after 756 hours than after 252 hours in both protocols for the dental adhesive when the Valo
Discussion
The mode of activation of the dental adhesive influenced the color stability and mechanical properties of the dental adhesive and the resin cement, and so the first null hypothesis was rejected. The use of different polymerization lights resulted in differences in color stability, HIT, and Eit* values, thus the third null hypothesis was rejected. Finally, analysis of the effects of different aging times on the color stability of ceramic laminates led to a rejection of the second null hypothesis.
Conclusions
Based on the findings of this in vitro study, the following conclusions were drawn:
- 1.
Nanohardness and elastic modulus were influenced by different polymerization lights, and the Valo polywave improved mechanical properties compared with the Radii-Cal single-wave polymerization light.
- 2.
The polymerization light had no effect on color stability.
- 3.
Previous photoactivation of dental adhesive in enamel using the Valo polywave yielded more satisfactory results.
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Funding: This study was supported by the São Paulo Research Foundation (FAPESP) (grant #2015/06355-0).