Department of Restorative Dentistry, Faculty of Dentistry, Istanbul Kent University, Istanbul, Turkey,
Department of Oral and Maxillofacial Radiology, Ankara Yıldırım Beyazt University, Ankara, Turkey.
Am J Dent. 2024 Aug;37(4):187-190.
To evaluate the radiopacities of CAD-CAM materials using digital techniques.
Five different CAD-CAM materials were used (Cerasmart, LAVA Ultimate, Cerec Blocs C, Tetric CAD, and IPS e.max CAD) in this study (n= 5). For each group, samples with thicknesses of 1 and 2 mm were prepared. As a control, tooth slices with 1 and 2 mm thicknesses and a 99.5% pure aluminum step wedge were used. The samples, tooth slices, and step wedges were placed on a photostimulable phosphor plate. Radiographs were taken at 30 cm distance with 7 mA, 70 kVp, and 0.32 ms exposure time. The images were analyzed using the ImageJ software to measure the mean gray values. Data were analyzed with Kruskal-Wallis H test and the Mann-Whitney U test (P< 0.05).
In the comparison of CAD-CAM materials with 1 and 2-mm thicknesses, the highest radiopacity value was seen in LAVA Ultimate samples (2.67 ± 0.05 for 1 mm samples: 5.74 ± 0.13 for 2 mm samples). The lowest value in 1 mm samples was seen in IPS e.max (0.59 ± 0.07), and in 2 mm samples, in Cerec Blocs C samples (1.49 ± 0.11). The results showed that the radiopacity values of the samples were associated with increased thicknesses. The 2 mm samples' radiopacity values were statistically significantly higher compared with the 1 mm samples. All samples except IPS e.max CAD and Cerec Blocs C had higher radiopacity than dentin (P< 0.05).
The radiopacity values were affected by thickness and type of materials. Comprehensive knowledge about the radiopacity of materials enables the selection of appropriate materials to achieve clinical success, which serves as a useful diagnostic aid in determining the long-term durability of restorations.
使用数字技术评估 CAD-CAM 材料的射线可探测性。
本研究使用了五种不同的 CAD-CAM 材料（Cerasmart、LAVA Ultimate、Cerec Blocs C、Tetric CAD 和 IPS e.max CAD）（n=5）。对于每个组，制备厚度为 1 毫米和 2 毫米的样本。作为对照，使用厚度为 1 毫米和 2 毫米的牙切片和 99.5%纯铝台阶楔。将样品、牙切片和台阶楔放置在光激励磷光体板上。在 30 cm 距离处，使用 7 mA、70 kVp 和 0.32 ms 曝光时间拍摄射线照片。使用 ImageJ 软件分析图像以测量平均灰度值。使用 Kruskal-Wallis H 检验和 Mann-Whitney U 检验（P<0.05）分析数据。
在比较 1 毫米和 2 毫米厚度的 CAD-CAM 材料时，LAVA Ultimate 样品的射线可探测性最高（1 毫米样品的最高值为 2.67 ± 0.05，2 毫米样品的最高值为 5.74 ± 0.13）。1 毫米样品中 IPS e.max 的最低值为 0.59 ± 0.07，2 毫米样品中 Cerec Blocs C 的最低值为 1.49 ± 0.11。结果表明，样品的射线可探测性值与厚度增加有关。与 1 毫米样品相比，2 毫米样品的射线可探测性值具有统计学显著意义更高。除 IPS e.max CAD 和 Cerec Blocs C 外，所有样品的射线可探测性均高于牙本质（P<0.05）。
射线可探测性值受材料厚度和类型的影响。对材料射线可探测性的全面了解有助于选择合适的材料以获得临床成功，这为确定修复体的长期耐久性提供了有用的诊断辅助。
