Elhelbawy Nahla Gamal, Ghouraba Rehab F, Hasaneen Fatma A
Dental Biomaterials Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Oral Medicine, Periodontology, Oral Diagnosis and Radiology Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Int J Biomater. 2022 Feb 21;2022:4131176. doi: 10.1155/2022/4131176. eCollection 2022.
The main purpose of this study was to assess the radiopacity of contemporary restorative computer-aided design (CAD)/computer-aided manufacturing (CAM) materials and the impact of material composition as measured by energy-dispersive X-ray spectrophotometry (EDX) on radiopacity.
Ten specimens of six CAD/CAM materials with 1 mm thickness were produced and then digitally radiographed with an aluminum (Al) step-wedge (SW) and 1 mm thick tooth slice. The specimen mean gray values (MGVs) were recorded in pixels and compared to an Al-SW, dentin, and enamel of equal thickness. For the elementary analysis of the composition of the materials, EDX was performed.
The recorded MGVs ranged between 21.20 ± 4.94 and 238.5 ± 13.61 pixels. Materials were sorted according to the MGVs descendingly, Prettau, Vita Suprinity, Vita Enamic, Shofu, Pekkton, and BioHPP. Prettau and Vita Suprinity had significantly higher MGV than dentin and 1 mm thick Al. In comparison, Vita Enamic had a slightly higher value than dentin and 1 mm thick Al. Although Pekkton and BioHPP had MGV significantly lower than dentin and 1 mm thick Al, Shofu had a significantly lower value than dentin and nonsignificantly lower than 1 mm thick Al ( < 0.05). According to EDX analysis, the examined materials contained several components in varying quantities of radiopacity.
The radiopacity of only three studied materials exceeded the International Organization for Standardization's minimum standards (ISO).
本研究的主要目的是评估当代修复用计算机辅助设计（CAD）/计算机辅助制造（CAM）材料的射线不透性，以及通过能量色散X射线光谱法（EDX）测量的材料成分对射线不透性的影响。
制作了六种CAD/CAM材料的十个厚度为1毫米的样本，然后用铝（Al）阶梯楔形块（SW）和1毫米厚的牙齿切片进行数字射线照相。记录样本的平均灰度值（MGV），以像素为单位，并与等厚度的Al-SW、牙本质和釉质进行比较。对材料成分进行元素分析，采用EDX法。
记录的MGV范围在21.20±4.94至238.5±13.61像素之间。材料按MGV值从高到低排序为Prettau、Vita Suprinity、Vita Enamic、松风、Pekkton和BioHPP。Prettau和Vita Suprinity的MGV显著高于牙本质和1毫米厚的Al。相比之下，Vita Enamic的值略高于牙本质和1毫米厚的Al。虽然Pekkton和BioHPP的MGV显著低于牙本质和1毫米厚的Al，但松风的值显著低于牙本质，且低于1毫米厚的Al不显著（<0.05）。根据EDX分析，所研究的材料含有几种射线不透性不同的成分。
仅三种研究材料的射线不透性超过了国际标准化组织的最低标准（ISO）。
