Effects of the combination of Er:YAG laser and sandblasting on the shear bond strength between zirconia and resin cement

Abstract

Aim: This study was conducted to determine the bond strength between zirconia ceramic and resin luting cement according to the type of surface treatment applied. Methods: Sixty zirconia cylinders measuring 4 x 4 mm were manufactured and distributed into five experimental groups and a control group (n = 10): G1 - sandblasting with 110 μm aluminum oxide; G2 - sandblasting with 30 μm Rocatec Soft®; G3 - Er:YAG laser irradiation at 400 mJ; G4 - Er:YAG laser combined with sandblasting with aluminum oxide; G5 - Er:YAG laser combined with sandblasting with Rocatec Soft®; G6 - no treatment (Control). The zirconia cylinders were bonded in the center of composite resin cylinders (6 mm diameter) using RelyX Ultimate® cement. Shear strength was measured after thermocycling (6000 cycles and 5-55° C). Data were analyzed using one-way ANOVA and Tukey's post-hoc with a 5% significance level. Results: Group 4 had a significantly higher shear strength than all the other groups, except Group 1. Group 3 had a significantly lower shear strength compared with Groups 1 and 4. Conclusion: Sandblasting with 110μm aluminum oxide particles after laser irradiation may be an effective zirconia surface treatment. The use of Er: YAG laser alone is not effective at increasing the bond between resin cement and zirconia.

Laser surface texturing of zirconia-based ceramics for dental applications: A review

“…J o u r n a l P r e -p r o o f and Nd:YAG laser [234,237,239,[241][242][243][244], conflicting results are frequently reported [245][246][247][248][249][250][251][252][253][254].…”

Effect of laser engraving on shear bond strength of polyetheretherketone to indirect composite and denture-base resins

“… 26 Subsequently, multiple studies have confirmed that laser engraving can significantly increase the SBS of Zr to DBRs or ICRs by creating micro-slits prior to bonding, which increases the surface area. 27 , 28 , 29 , 30 , 31 Accordingly, it is believed that laser engraving could improve the surface characteristics of PEEK, enhance mechanical bonding, and ultimately increase the SBS. 26 , 27 , 28 , 29 , 30 , 31 This study aims to evaluate the impact of grid-like microslits created by laser engraving on PEEK's surface and compare it with other mechanical surface treatments for bonding PEEK to DBRs or ICRs.…”

“… 27 , 28 , 29 , 30 , 31 Accordingly, it is believed that laser engraving could improve the surface characteristics of PEEK, enhance mechanical bonding, and ultimately increase the SBS. 26 , 27 , 28 , 29 , 30 , 31 This study aims to evaluate the impact of grid-like microslits created by laser engraving on PEEK's surface and compare it with other mechanical surface treatments for bonding PEEK to DBRs or ICRs. The null hypothesis of this study is that laser-engraved grid-like microslits do not significantly improve the shear bond strength of PEEK compared to other surface treatments.…”