치과용 리튬 디실리케이트 세라믹의 다양한 표면 처리에 따른 표면 특성

Abstract

Lithium disilicate ceramics are widely used in dental prosthetics due to their outstanding mechanical prop- erties and aesthetic appeal. Among these materials, the Rosetta® SM blocks manufactured by HASS stand out as a leading choice for CAD/CAM restorations, offering both processability and clinical reliability. This study aims to evaluate the effects of various surface treatment protocols on the surface morphology and characteristics of Rosetta® SM lithium disilicate blocks. Five treatment groups were compared: mechanical polishing, hydrofluoric acid (HF) etching, silane primer application, a combination of HF etch- ing followed by silane application, and a one-step treatment using ammonium polyfluoride (APF) with silane. Surface characteristics were analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR), nanoindentation, contact angle mea- surement, and X-ray diffraction (XRD). Among the treatment protocols, the combination of HF etching and silane application yielded the most favorable microstructural features for adhesive bonding, charac- terized by well-defined surface roughness and enhanced surface energy. The APF-silane one-step treat- ment also showed promising results, demonstrating reduced technique sensitivity and improved clinical applicability. These findings indicate that the choice of surface treatment significantly influences the adhe- sive interface and may enhance the long-term performance of lithium disilicate ceramic restorations.