Shear Bond Strength of Two Repair Systems to Zirconia Ceramic by Different Surface Treatments

Abstract

Introduction: Intraoral repair has been suggested as a treatment option to repair the chipping or fracture of veneered zirconia; the success of the procedure is mainly determined by the bonding between zirconia and composite resin. The present study aimed to investigate and compare the shear bond strength (SBS) of two intraoral repair systems to zirconia ceramic treated with a laser or air-abrasion surface modification. Methods: Ninety tube-shaped samples (diameter of 10 mm and height of 4 mm) were divided into three main groups: Group I (zirconia 100%, n=30); Group II (veneer ceramic 100% n=30); Group III (zirconia with a veneer ceramic n=30). Each main group was subdivided into two subgroups (n=15): Subgroup A: samples repaired with Ceramic Repair N; Subgroup B: samples repaired with the Cimara Repair System. The subgroup samples were further subdivided based on the treated surface (n=5 samples): Control (no surface modification), Er,Cr:YSGG laser surface modification, and air-abrasion surface modification. The SBS was employed using a universal testing machine. The mode of failure was observed using a stereomicroscope. Results: Significant differences were observed in the mean SBS values between the different surface modifications (P˂0.05). Tukey’s post hoc test showed that the air-abrasion surface modification of the veneer ceramic repaired with the Ceramic repair N system had the highest mean value (13.74 MPa) among the different groups, while no surface modification of zirconia repaired with the Cimara repair system had the lowest mean value (2.84 MPa). The control group (no surface modification) had the lowest mean value among all the treated groups. Conclusion: The SBS is surface modification-dependent, and higher SBS is obtained by air-abrasion than Er, Cr:YSGG laser surface modifications with the selected parameters. The Ceramic repair N system had significantly higher SBS for all surface-treated substrates than the Cimara repair system.

Effect of Surface Treatment with Alkaline Agents at Two Different Temperatures on Microshear Bond Strength of Zirconia to Composite Resin

“…Dental ceramics are extensively used for indirect tooth restorations [ 1 , 2 ]. Zirconia is highly popular in dentistry due to its unique properties such as high biocompatibility and optimal esthetics.…”

“…It is commonly used for the fabrication of prosthetic crowns, implant abutments, frameworks, intracanal posts, orthodontic brackets, etc. [ 1 , 2 , 6 ]. Although zirconia has been used for dental applications since 1960, the advent of computer-aided design/computer-aided manufacturing technology revolutionized its applications and further added to its popularity [ 6 ].…”

“…Chemomechanical retention is required for a stable bond between ceramic and composite resin. Different surface treatments have been proposed to enhance bonding to zirconia, such as sandblasting, tribochemical silicoating, and laser irradiation [ 1 , 2 , 10 , 11 ]. Sandblasting creates a porous surface and increases the bonding surface area and micromechanical retention [ 1 ].…”

“…Sandblasting creates a porous surface and increases the bonding surface area and micromechanical retention [ 1 ]. Also, evidence shows that sandblasting of zirconia can increase the bond strength of zirconia under mechanical tensions, prevent crack initiation and progression, and increase the durability of restoration [ 1 , 2 ]. Arami et al [ 2 ] demonstrated that alumina sandblasting significantly increased the microshear bond strength ( μ SBS) of zirconia to composite resin and was more effective than Er:YAG and Nd:YAG laser irradiation.…”

Effect of ZrO2 paste, surface treatments, and storage on Weibull characteristics and resin bond strength to zirconia

“…Advances in the microstructure of this ceramic enabled development of three generations of zirconia: conventional (first generation), translucent (second generation), and ultratranslucent (third generation) 2 . Such improvements were due to the interest of the dental market in monolithic ceramics with better aesthetics, considering that it was initially frequent to use glass-ceramic coverings with better translucency and aesthetic properties in zirconia copings due to the opaquer characteristic of conventional zirconia; however, such a procedure was subject to high levels of wear, cohesive failures and chipping 3 . In this regard, ultra-translucent zirconia has gained great prominence in modern dentistry thanks to its ability to add excellent aesthetic properties, in addition to mechanical properties, thus becoming a truly versatile ceramic with greater clinical applications, as well as for aesthetic areas due to the use of ceramic laminates 4 .…”