IADR Abstract Archives
Shear-Bond Strength of Lithium Disilicate/Cement: Effect of Silane Heat Treatment
Objectives: All-ceramic restorations comprise a majority of current indirect restorations, with lithium disilicate being one of the most widely used of these materials. The intaglio surface of a lithium disilicate restoration must be cleaned, etched and treated in order to create a bondable surface prior to cementing to tooth structure. Industrial processes often use high temperatures when applying silane treatments. The aim of this study was to compare the effects of different heat treatments after etching and silanation of lithium disilicate samples on shear bond strength (SBS).
Methods: Thirty-five lithium disilicate (e.max® Ivoclar Vivadent, Amherst, NY) sections were randomly assigned to 5 groups. (n= >5 each). Sections were embedded in acrylic cylinders and polished with an Eco-Met 250 Polisher Grinder (Buehler, Lake Bluff, IL) finishing with #600 grit discs. Each sample was etched with 5% Hydrofluoric acid for 20 seconds and silanated with Monobond Plus® (Ivoclar Vivadent) for 60 seconds. Two shear bond strength samples of Multilink® Automix (Ivoclar Vivadent) resin cement were applied to each prepared surface using an Ultradent jig (Ultradent Products, South Jordan, UT) and light polymerized for 20 seconds using a Bluphase Style (Ivoclar Vivadent) LED curing light. Conditions after silanation but prior to bonding samples are listed in Table 1.
Samples were aged in water for 24 hours (37°C). SBS was determined using an Ultradent testing jig on an ElectroPuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min. SBS data was compared using ANOVA and post-hoc Tukey for significance with α=0.05.
Results: SBS results are shown in Figure 1.
Conclusions: Increased temperature did not show an increase in SBS over the ambient bonding method. Degradation of SBS was significantly higher at longer times regardless of temperature.
Methods: Thirty-five lithium disilicate (e.max® Ivoclar Vivadent, Amherst, NY) sections were randomly assigned to 5 groups. (n= >5 each). Sections were embedded in acrylic cylinders and polished with an Eco-Met 250 Polisher Grinder (Buehler, Lake Bluff, IL) finishing with #600 grit discs. Each sample was etched with 5% Hydrofluoric acid for 20 seconds and silanated with Monobond Plus® (Ivoclar Vivadent) for 60 seconds. Two shear bond strength samples of Multilink® Automix (Ivoclar Vivadent) resin cement were applied to each prepared surface using an Ultradent jig (Ultradent Products, South Jordan, UT) and light polymerized for 20 seconds using a Bluphase Style (Ivoclar Vivadent) LED curing light. Conditions after silanation but prior to bonding samples are listed in Table 1.
Samples were aged in water for 24 hours (37°C). SBS was determined using an Ultradent testing jig on an ElectroPuls E3000 (Instron, Norwood, MA) with a crosshead speed of 0.5mm/min. SBS data was compared using ANOVA and post-hoc Tukey for significance with α=0.05.
Results: SBS results are shown in Figure 1.
Conclusions: Increased temperature did not show an increase in SBS over the ambient bonding method. Degradation of SBS was significantly higher at longer times regardless of temperature.
2635703_File000000.jpg