Evaluation of the effects of surface roughening processes performed with different laser types on the shear bond strength between zirconia reinforced lithium silicate ceramics and resin composite

Hopur Kilic, Elif Hacer. (2021). Evaluation of The Effects of Surface Roughening Processes Performed with Different Laser Types on The Shear Bond Strength between Zirconia Reinforced Lithium Silicate Ceramics and Resin Composite. Istanbul University Faculty of Dentistry Department of Prosthodontics. Istanbul. 2021 The purpose of this study is to examine the effects ofsurface roughening processes performed with different laser types on shear bonding strength of zirconium reinforced lithium silicate glass ceramics with composite resin. We divide the test materials into five groups according to surface treatments (n = 10). We apply HF acid, Er: YAG laser, Er: YAG laser + HF acid, Nd: YAG laser, Nd: YAG laser + HF acid surface roughening techniques to groups 1,2,3,4, and 5 respectively. To evaluate the surface roughnesses, we perform optical profilometer and SEM analyzes. Afterward, to each group, we apply silane, bonding agent, and composite resin of 3mm diameter and 4mm height with the layering technique. Than we subject the samples to thermal cycle application and shear bonding test in that given order, we examine their surfaces with a light microscope and classify the samples according to their fracture types. As a result of these experiments, we discover a statistically significant difference among groups related to the shear bonding strength (SBS). The highest SBS value detected is in Group 3 and the lowest in Group 4. The highest surface roughness was seen in Group 3. Key Words: Zirconia reinforced lithium silicate glass ceramic, porcelain repair, surface treatment, bond strength, laser The present work was supported by the Research Fund of Istanbul University. Project No. 36826