Effectiveness and safety of bleaching agents on lithium disilicate glass ceramics

Abstract

Background. Aesthetic expectations have increased the use of aesthetic materials in dentistry. Lithium disilicates are frequently used materials for these expectations. Bleaching is another method used to provide aesthetics. Bleaching processes on restorative materials are not fully known. This study investigated the effect of at-home and in-office bleaching methods on the color change, surface roughness, and topography of lithium disilicate glass-ceramic materials produced with two different techniques and subjected to different polishing procedures. Methods. A total of 144 disc-shaped pressed and computer-aided design (CAD) lithium disilicate glass-ceramic specimens were randomly divided into four groups. Glazing and three different chair-side polishing procedures were performed. The specimens in each group were randomly divided into two groups and subjected to at-home and in-office bleaching processes (n=9). The home bleaching process was repeated with 16% carbamide peroxide agent for six hours for seven days, while the in-office bleaching process was applied with 40% hydrogen peroxide agent for two sessions of 20 minutes. After the bleaching processes, the final color and surface roughness experiments of the specimens were carried out, and the results were recorded. ANOVA and Tukey multiple comparison tests were used FOR the statistical analysis of the data (α=0.05). Results. The material*polish*bleaching, polish*bleaching, material*bleaching, and material*polishing interactions were not statistically significant regarding color and roughness changes of both specimens (P>0.05). Conclusion. Both bleaching processes can be safely applied to lithium disilicate glass-ceramic materials.

Effect of immune-boosting beverage, energy beverage, hydrogen peroxide superior, polishing methods and fine-grained dental prophylaxis paste on color of CAD-CAM restorative materials

“…Previous studies [49,51] had reported that the application time is signi cant in the effect of BLE on ceramics. Similar to this study, the number of studies in which glazed and mechanically polished ceramics were examined together is insu cient, and studies [21,23,47,52] found that glazed surfaces were less affected than mechanically polished surfaces in parallel with this study. The researchers reported that the magnitude of the effect of BLE is related to the application time.…”

“…There is no study on the effect of beverage with Sambucus Nigra on the color of CAD-CAM ceramic or hybrid ceramic materials. There are several studies [7,15,[21][22][23] examining the effect of polishing methods, BLE or PDP on the color of CAD-CAM restorative materials, but no study has examined these variables together. For these reasons, the aim of this study was to evaluate the effect of energy beverage and immune-boosting beverage with Sambucus Nigra, in-o ce BLE with HPS and PDP on color of CAD-CAM FC, ZLS and HC.…”