Radiopacity of Nonmetallic CAD/CAM Restorative Blocks

Radiopacity of Resin Cements Using Digital Radiography

“…Mean radiopacity values of enamel and dentin in this study were 1.95 mm Al/1 mm and 1.10 mm Al/1 mm, respectively. These values fall well within a range of mean values reported for enamel (1.84–2.20 mm Al/1 mm) and for dentin (0.70–1.16 mm Al/1 mm) in four previous studies . Variation in radiopacity measurements among different studies is related to a number of factors including specimen thickness, material composition, X‐ray exposure parameters, X‐ray beam angulation, type of sensor, X‐ray machine, and evaluation method .…”

“…These values fall well within a range of mean values reported for enamel (1.84-2.20 mm Al/ 1 mm) and for dentin (0.70-1.16 mm Al/1 mm) in four previous studies. 1,[20][21][22] Variation in radiopacity measurements among different studies is related to a number of factors including specimen thickness, [23][24][25] material composition, 23,24 X-ray exposure parameters, X-ray beam angulation, type of sensor, X-ray machine, and evaluation method. 23,26 Since all examined cements had radiopacity values greater than that of dentin the null hypothesis is accepted as in ISO, ANSI/ADA guidelines.…”

“…Using tooth sections among material specimens served as a reliable control considering that the radiopacity of dentin has been previously reported in several studies. 1,[20][21][22] ISO set the minimum limit of radiopacity of restorative materials, however, it did not set the upper limit. A material with high radiopacity value such as amalgam may hinder radiographic interpretation.…”

“…Resin cements are used for various purposes such as cementing laminate veneer, none‐metallic indirect restorations as inlays, onlays, and ceramic crowns. A previous study on radiopacity of different CAD/CAM blocks showed glass‐ceramic based blocks (leucite, lithium disilicate) to have radiopacity values close to that of dentin (1.15 mmAl/1.0 mm material) . This may make it difficult to identify the interface between a restoration and the tooth structure on radiographic images used for monitoring of restoration performance.…”

Comparison of radiopacity of current restorative CAD/CAM blocks with digital radiography

“…Radiopacity of aluminum has been reported to be similar to dentin, therefore, International Standards Organization (ISO) declared that radiopacity of dental materials should be equal to or greater than that of Al (with ≥98% purity) with the same thickness . There are few studies in the literature regarding the assessment of the radiopacity of CAD/CAM blocks, so the aim of this study was to evaluate the radiopacities of 13 different current CAD/CAM restorative blocks in comparison with the aluminum steps according to ISO standards and to contribute to the literature.…”