Title: 0251 - Microshear Bond Strength of Self-etching Ceramic Primer to Lithium Disilicate Ceramic
Terawat Tosiriwatanapong (Presenter)
Nontawat Chunsiri, Thammasat University
Chawin Aungkatawiwat, Thammasat University
Objectives: To compare the microshear bond strength (microSBS) of resin cement to lithium disilicate glass ceramic after artificial aging process between the current standard protocol and the new protocol using self-etching ceramic primer.
Methods: Lithium disilicate glass ceramic blocks were cut into rectangular sections (12 × 7 × 2 mm3) and sintered to complete crystallization. All specimens were then mounted on a polyvinyl chloride ring filled with acrylic resin and randomly assigned to 5 groups (n = 10) according to surface treatment and mode of storage:
Group I : no surface treatment
Group II,IV : etched with < 5% HF followed by Monobond Plus Group III,V : treated with MEP
After surface treatment, two polyethylene tubes were positioned on each ceramic specimen and resin cement (Multilink N, Ivoclar Vivadent) was applied under magnifying loupes. Specimens in groups I,II and III were then stored in 37°C distilled water for 24 hours. Groups IV and V were subjected to thermocycling between 5°C & 55°C for 10,000 cycles. All specimens were submitted for microSBS test (EZ-test-50N, Shimadzu) at a constant crosshead speed of 1 mm/min. Mode of failure was observed under stereomicroscope. Data of microSBS were analyzed using Kruskal-Wallis test and Dunn-Bonferroni test for multiple comparisons.
Results: The mean microSBS of each group and mode of failure are shown in Table 1. After storage in distilled water at 37°C for 24 hours, both surface treatment protocols exhibited comparable microSBS, but differed significantly from the control group. After 10,000 thermal cycles, the microSBS values obtained with both protocols were still statistically insignificant. Considering the effect of artificial aging process on the microSBS, there were no significant differences between the water storage groups and the thermocycling groups regardless of surface treatment protocols.
Conclusions: After 24-hour storage in water, our result aligns with the previous study. Still, there are no other published articles addressing the microSBS after artificial aging process. Within the limitations of this in vitro study, the self-etching ceramic primer could provide microSBS after undergoing thermocycling paralleled to the current standard protocol.
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The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE