Effect of different surface treatments on bond strength of resin cement to two recent ceramic materials

Abstract

Background: The adhesion of indirect restorations to the tooth structure is a very critical step that a lot of operators underestimate it & don’t understand its importance which will influence durability and success of restorations. By overcoming failures that occur due to improper bonding we can reach the best durability of the restoration helping us reach our goal which is fabricating a restoration that mimics natural teeth. So Bonding between indirect restorations and tooth, will fulfill high retention, preventing microleakage, and creating good marginal adaptation. Aim of the Work: This research was performed to study the effect of different surface treatments which are: Acid etching & silanation (9.5 % HF acid etching),Al2O3 sandblasting & silanation,2W, Er,Cr:YSGG laseretching with repition rate 20 HZ for 20 secs & silanation, to two recent ceramic materials: resin nano ceramic (Crystal Ultra)&True hybrid ceramic polymer infiltrated ceramic network material (Vita Enamic). Materials and Methods: Blocks of two CAD CAM esthetic restorative materials (VITA Enamic and Crystal Ultra) were used to prepare slices with the following dimensions: 14mm x 12mm x 1mm for Vita Enamic ceramic material & 19mm x 15mm x 1 mm for Crystal Ultra ceramic material. Using IsoMet 4000 microsaw with cooling water system, by adimond disk 0.6 mm thickness with cutting speed 2500 rpm. For easier handling and fixation during the micro shear test, a number of 9 slices of crystal Ultra Material & 12 slices of Vita Enamic material were embedded in an acrylic blocks, before any surface treatments. Results: For VITA Enamic, hydrofluoric acid etching & silanation as Surface treatment had the highest (mean±SD) value, followed by sandblasting & silanation, while Laser surface etching followed by silanation had the lowest (mean±SD) values. For Crystal Ultra, sandblasting & silanation had the highest (mean±SD) value, followed by hydrofluoric acid etching & silanation,, while the laser surface etching followed by silanation had the lowest (mean±SD) value. Conclusion: Crystal Ultra showed the highest bond strength after sandblasting & silanation. In Vita Enamic HF acid etching & silanation had the highest bond strength than other surface treatments. Laser surface etching & silanation had significantly lower values for both materials used.