Effect of different surface treatments and multimode adhesive application on the Weibull characteristics, wettability, surface topography and adhesion to CAD/CAM lithium disilicate ceramic

Abstract

This paper aims to evaluate the effect of different surface treatments on surface topography, wettability, and shear bond strength of resin cement to glass ceramic. Methodology: For SBS test, 32 blocks (7x7x2 mm) of lithium disilicate were obtained and randomly divided into eight groups (four blocks per group) according to each surface treatment (HF 20 s, 60 s, 120 s + silanization/S or Scotch Bond Universal/ SBU) and the Monobond Etch & Prime-MEP application followed or not by SBU. On each treated surface ceramic block, up to four dual-curing resin cement cylinders were prepared and light-cured for 40s (N=120/n=15). The specimens were thermocycled (10,000 cycles, 5-55°C, 30 s) and the SBS test (50KgF, 0.5 mm/min) was performed. Furthermore, failure analysis, wettability, AFM, and SEM were carried out. SBS data (MPa) were analyzed using Student's t-test, two-way ANOVA, Tukey's test (5%) and Weibull's analysis. Results: For HF experimental groups, two-way ANOVA presented the factors "etching time" and "bonding agent" as significant (p<0.05). After silane application, the HF groups presented similar bond strength. SBU application compromised the SBS, except for 120s etching time (HF120sS: 23.39 a ±6.48 MPa; HF120sSBU: 18.76 a ±8.81MPa). For MEP groups, SBU application did not significantly affect the results (p=0.41). The MEP group presented the highest Weibull modulus (4.08 A) and they were statistically different exclusively from the HF20sSBU (0.58 B). Conclusion: The HF 20s, 60s, 120 s followed by silane, promoted similar resin-bond strength to ceramic and the SBU application after HF or MEP did not increase the SBS.

Effect of Different Etching Times with Hydrofluoric Acid on the Bond Strength of CAD/CAM Ceramic Material

“…In the literature, supplementing the etching time and the concentration of HF for lithium disilicate have led to inverse results. Souza et al noticed that HF etchant may induce a higher or incomplete dissolution of the glassy phase in the ceramic materials due to exposure time or acid concentration [ 44 ]. Some studies tested different HF etching times and found that increasing the demineralization period above 30 s led to a stronger adhesion between feldspathic ceramic and a resin cement [ 37 , 43 ].…”

Bonding of Clear Aligner Composite Attachments to Ceramic Materials: An In Vitro Study

“…In 2020, Souza et al compared different HFA etching times (20, 60 and 120 s + silanization or Scotch Bond Universal) on the bond strength of lithium disilicate. They found that etching with HFA for 60 s followed by silane produced the highest SBS but they were not significantly different from 20 or 120 s. Moreover, Scotchbond Universal compromised the SBS except for applying HFA for 120 s [24]. On the other hand, Mehmeti et al, in 2019, compared the effect of 5% HFA etching and 37% PhA etching for 120 s and found that they both provided similar bond strengths [25].…”

Surface roughness and characteristics of CAD/CAM zirconia and glass ceramics after combined treatment procedures

“…The tested LDS ceramic is the most preferable high translucent material in prosthodontics, and therefore there are a lot of informations about the surface parameters of this ceramic in the literature [ 47 , 48 , 50 ]. Laser irradiation is not commonly used to surface traetment for LDS.…”