Radiopacity of 12 visible‐light‐cured dental composite resins

Abstract

The radiopacity of 12 VL-cured composite resins was determined with reference to an aluminum step-wedge. Two anterior composites were radiolucent while two anterior and one anterior/posterior composites exhibited the radiopacity equal to, or slightly greater than, that of human enamel. Three posterior and one inlay composites possessed the radiopacity equivalent to, or in tiny excess of, that of human enamel. Three posterior composites had the radiopacity, fairly exceeding that of human enamel. Chemical analyses of the filler particles were carried out with SEM/EDX. It became evident that radiopaque fillers contained at least one radiopaque oxide component such as BaO, ZrO2 and Yb2O3 with varying concentrations. In general, the radiopacity of the composite resin was linearly proportional to the amount of the radiopaque oxide in the filler. It was suggested that ZrO2 was radiopacifier equivalent to, or even stronger than, BaO.

Reinforcement of flowable dental composites with titanium dioxide nanotubes

“…Three methods are known to measure the radiopacity of dental materials including transmission densitometry, direct digital radiography, or indirect Higher OD associated with lower radiopacity [76,77]. Direct digital method utilizes certain image sensor to provide a direct electronic reading.…”

Influence of inorganic filler content on the radiopacity of dental resin cements

“…Secondary caries is the principal cause for the failure and replacement of dental restorations. Therefore, detection of secondary caries adjacent to filling materials 9) on a radiograph is as important as the recognition of faulty proximal contours, voids, inadequate marginal adaptation, and interfacial gaps 10) . Endodontically treated teeth are more susceptible to fractures than unrestored vital teeth.…”

“…To determine radiopacity using conventional X-ray films, measurements were done using densitometers 10) , spectrophotometers 12) , chargecoupled device (CCD) sensors 13) , or storage phosphor plate systems 13) . X-ray film images are scanned using a CCD camera, a laser scanner or a flatbed scanner, and these scanned X-ray film images are subsequently converted into digital images for quantitative analysis using an image analysis software 14) .…”

Transverse microhardness of artificial teeth

“…Literature states that this product contains interpenetrated polymer networks (IPN), which are materials made of two polymers, each one in a different network shape, one network being inside the other. [6][7][8][9] Another manufacturer (Sustained Life Material -Dentsply, PA) despite not self-qualifying as IPN, declares that there would be an improvement in this product (Trublend SLM) caused by the incorporation of cross-links in the polymer networks with polyethylene particles of high molecular weight, which would also enhance the lubricant effect. 8,10 Composite resin teeth with silica particles were found in SR-Ortosit PE (Ivoclar, Schaan, Liechtenstein), detected by the analysis with EDX.…”

“…[3][4][5][6][7][8] The latter being the case of Trubyte Bioform IPN (Dentsply International/ Pennsylvania, USA). Literature states that this product contains interpenetrated polymer networks (IPN), which are materials made of two polymers, each one in a different network shape, one network being inside the other.…”