Savaş Abdulhaluk, Tunçdemir Ali Rıza
Clinician, Beyhekim Public Dental Health Hospital, Konya, Turkey.
Professor, Necmettin Erbakan University, Faculty of Dentistry, Department of Prosthodontics, Konya, Turkey.
J Prosthet Dent. 2025 Jul;134(1):224.e1-224.e9. doi: 10.1016/j.prosdent.2025.05.021. Epub 2025 May 30.
Despite the availability of lithium disilicate-based glass-ceramics with different compositions, the effects of aging, surface finishing, and repolishing on their color coordinates, color stainability, and translucency remain unclear.
The purpose of this study was to evaluate the optical properties, including the Commission Internationale de l'Eclairage (CIE) color coordinates (L*, a*, b*, C*, and h°), color stainability (ΔE), relative translucency parameter (RTP), and translucency stability (ΔRTP) of polished and glazed lithium disilicate-based glass-ceramics after thermal cycling and repolishing.
A total of 100 specimens from 5 lithium disilicate glass-ceramic materials (IPS e.max CAD [LDS], GC Initial LiSi Block [LD], Celtra Duo [ZLS], CEREC Tessera [ALD], and Amber Mill [NLD]) were prepared at 1.5 ±0.01 mm thicknesses. Each material was divided into 2 subgroups: mechanically polished and glazed (n=10). Color measurements were made initially, after 5000 coffee thermal cycles, and after repolishing. L*, a*, b*, C*, h°, ΔE, RTP, and ΔRTP values were recorded. Statistical analysis was conducted using robust ANOVA and Bonferroni multiple comparison tests (α=.05).
NLD had the lowest L*, a*, and b* values but the highest h°, while ALD showed the highest a*, b*, and C* values (P<.001). Polishing increased a*, b*, and C* but decreased h° compared with glazing (P<.001). After coffee thermocycling and repolishing, all materials showed color changes within clinically acceptable limits (ΔE <1.77). NLD had the highest RTP, while ZLS had the lowest (P<.001). Glazing increased RTP in most materials, though a significant decrease was observed in NLD (P=.002) and ZLS (P=.001). ΔRTP values remained clinically imperceptible (<0.62).
The optical properties of lithium disilicate-based glass-ceramics were affected to varying degrees by material type, surface finishing, coffee thermal cycling, and subsequent repolishing. All materials maintained clinically acceptable color stainability and translucency, though differences in color coordinates, stainability, and translucency were material dependent.
尽管有不同成分的基于二硅酸锂的微晶玻璃，但老化、表面处理和再抛光对其颜色坐标、颜色可染性和半透明度的影响仍不明确。
本研究的目的是评估热循环和再抛光后抛光和上釉的基于二硅酸锂的微晶玻璃的光学性能，包括国际照明委员会（CIE）颜色坐标（L*、a*、b*、C*和h°）、颜色可染性（ΔE）、相对半透明度参数（RTP）和半透明度稳定性（ΔRTP）。
从5种二硅酸锂微晶玻璃材料（IPS e.max CAD [LDS]、GC Initial LiSi Block [LD]、Celtra Duo [ZLS]、CEREC Tessera [ALD]和Amber Mill [NLD]）制备了总共100个试样，厚度为1.5±0.01毫米。每种材料分为2个亚组：机械抛光和上釉（n = 10）。在初始、5000次咖啡热循环后和再抛光后进行颜色测量。记录L*、a*、b*、C*、h°、ΔE、RTP和ΔRTP值。使用稳健方差分析和Bonferroni多重比较检验（α = 0.05）进行统计分析。
NLD的L*、a和b值最低，但h°最高，而ALD的a*、b和C值最高（P < 0.001）。与上釉相比，抛光增加了a*、b和C，但降低了h°（P < 0.001）。经过咖啡热循环和再抛光后，所有材料的颜色变化均在临床可接受范围内（ΔE < 1.77）。NLD的RTP最高，而ZLS的最低（P < 0.001）。上釉在大多数材料中增加了RTP，尽管在NLD（P = 0.002）和ZLS（P = 0.001）中观察到显著降低。ΔRTP值在临床上仍难以察觉（< 0.62）。
基于二硅酸锂的微晶玻璃的光学性能受到材料类型、表面处理、咖啡热循环和随后再抛光的不同程度影响。所有材料均保持临床可接受的颜色可染性和半透明度，尽管颜色坐标、可染性和半透明度的差异取决于材料。
