Alasmari Mohammed Ali, Rayyan Mohammad Ramadan
Prosthodontic Department, Dental Center, King Salman Armed Force Hospital, Tabuk, Saudi Arabia.
Prosthodontic Department, College of Medicine and Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia.
Heliyon. 2024 Nov 28;10(23):e40757. doi: 10.1016/j.heliyon.2024.e40757. eCollection 2024 Dec 15.
Translucency of dental ceramics have great impact on the esthetic and success of dental restorations. The goal of the study is to investigate the effect of the aging process on the translucency of zirconia-reinforced lithium silicate ceramic material, and lithium disilicate ceramic material made using CAD/CAM and press processes.
Thirty disc-shaped specimens with 0.5 mm thickness and 10 mm diameter were fabricated of IPS e.max Press (n = 10), IPS e.max CAD (n = 10), and VITA Suprinity (n = 10) (Vita). All ceramic specimens were fabricated with shade that corresponded to A2 with high translucency (HT) and subjected to measurement of relative translucency parameter (RTP) with a spectrophotometer machine prior to and following thermocycling. The results were analyzed using the one-way ANOVA and Bonferroni methods. To identify any statistically significant change in translucency after thermocycling, paired t-tests were utilized.
The mean ΔRTP after aging was 3.23 ± 0.36, 0.60 ± 0.34, 3.05 ± 0.90 for IPS e.max CAD, IPS e.max Press, and Suprinity respectively. The mean RTP values in IPS e.max CAD and Suprinity decreased significantly after aging (p˂0.05). However, there was no statistically significant difference between the RTP values of the IPS e.max Press before and after aging (p > 0.05).
Prior to aging, there was no difference between the three materials in terms of the translucency parameter. However, the translucency of CAD/CAM lithium disilicate and zirconia reinforced lithium silicate was negatively influenced by aging.
牙科陶瓷的透明度对牙齿修复体的美观性和成功率有很大影响。本研究的目的是调查老化过程对氧化锆增强硅酸锂陶瓷材料以及采用计算机辅助设计与制造（CAD/CAM）和压制工艺制作的二硅酸锂陶瓷材料透明度的影响。
制作30个厚度为0.5毫米、直径为10毫米的圆盘形试件，其中10个由义获嘉IPS e.max Press制作，10个由义获嘉IPS e.max CAD制作，10个由维他（VITA）公司的VITA Suprinity制作。所有陶瓷试件均制作成与高透明度（HT）的A2色相对应的颜色，并在热循环前后使用分光光度计测量相对透明度参数（RTP）。结果采用单因素方差分析和邦费罗尼方法进行分析。为了确定热循环后透明度的任何统计学显著变化，采用配对t检验。
老化后，IPS e.max CAD、IPS e.max Press和Suprinity的平均ΔRTP分别为3.23±0.36、0.6±0.34、3.05±0.90。老化后，IPS e.max CAD和Suprinity的平均RTP值显著下降（p<0.05）。然而，IPS e.max Press老化前后的RTP值之间无统计学显著差异（p>0.05）。
老化前，三种材料在透明度参数方面无差异。然而，CAD/CAM二硅酸锂和氧化锆增强硅酸锂的透明度受老化的负面影响。
