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TheraCal LC is a new class of materials based on resin modified calcium silicates (RMCS). It has been reported to stimulate apatite formation and hence secondary dentin deposition. Objectives: The study was conducted to assess the influence of using different adhesives on the shear bond strength of bulk fill dental resin composite to TheraCal LC, in correlation to their effect on the surface roughness of TheraCal LC. Materials and methods: Different adhesives were used in the study; Xeno® V+, Prime & Bond® NTTM adhesive (without etching), AdheSE bonding agent (without etching or priming). Specimens were grouped into four groups: Group 1 included TheraCal LC specimens treated with Xeno® V+ adhesive. Group 2 included TheraCal LC specimens treated with Prime & Bond® NTTM adhesive. Group 3 included TheraCal LC specimens treated with AdheSE bonding agent. Group 4 included untreated TheraCal LC specimens; to be used as a control group. For shear bond strength testing; stainless steel molds having central holes of 5mm diameter and 2mm depth were used for preparation of TheraCal LC specimens. The molds were filled with TheraCal incrementally. The adhesives were applied to TheraCal LC surface; following manufacturer instructions. Quix fil packable resin composite was applied on top of TheraCal LC using split Teflon molds; having a central hole of 2mm diameter and 4mm depth. Shear bond strength testing was performed using the universal testing machine. Load was applied using a chiseledge plunger; at the TheraCal LC/ resin composite interface. The test was run at a cross head speed of 0.5 mm/ minute until debonding. For surface roughness evaluation, same specimens’ grouping was followed. Stainless steel molds having central holes of 5mm diameter and 2mm depth were used for preparation of TheraCal LC specimens. The adhesives were then applied to the TheraCal LC surface; following manufacturer instructions. Ra surface roughness values of TheraCal LC were measured using TR 220 surface roughness tester. Scanning Electron Microscopic examination was performed to the TheraCal LC surface after application of the tested adhesives to assess their influence on the surface topography of TheraCal CL. Data were statistically analyzed using one way analysis of variance (ANOVA) and Tukey’s post hoc test at a significance level (p≤ 0.05). Pearson correlation was performed between results of surface roughness and shear bond strength tests for all groups. (1564) Dina A. ElRefai E.D.J. Vol. 62, No. 2

egyptian dental journal /egyptian dental journal

BOND STRENGTH OF BULK FILL DENTAL RESIN COMPOSITE TO THERACAL LC USING DIFFERENT ADHESIVES AND THE POSSIBLE CORRELATION TO THERACAL LC SURFACE ROUGHNESS