The result: Group E (LiteTouch™ Er:YAG Laser 500mJ x 15Hz) exhibited more pronounced and uniform etching effect compared to groups C (300mJ x 15Hz) and D (400mJ x 15Hz). Microleakage and bonding strength analyses revealed that the laser and 9.6% HF acid pretreatment groups (Group B) differed significantly from the control group (Group A) in dye penetration depth and shear strength (P < 0.05), although the LiteTouch™ Laser and acid-etching groups did not differ from each other, indicating comparable outcomes in these aspects.
The conclusion: The LiteTouch™ Er:YAG Laser demonstrated distinct etching effects on the glass–ceramic surface, enhancing the bonding properties between the glass–ceramic and dentin. Moreover, the Er:YAG Laser at 500mJ x 15Hz resulted in a surface modification effect on the glass–ceramic, which was comparable to that achieved through a 9.6% hydrofluoric acid pretreatment, which can prevent the HF’s detrimental effects on the oral mucosa and dental pulp. In the future, the effects of LiteTouch™ Er:YAG Laser pretreatment on the microleakage and bonding strength between glass–ceramic and dentin should be monitored in clinical practice.
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