Abstract
Radiopacity of resin for crown, brige and inlay is a necessary property in clinical use. This study examined the radiopacity of commercial autocured resin, thermosetting resin and resin for inlay and the factors causing high radiopacity.
The radiopacity of autocured resin and thermosetting resin were not high, but resin for inlay demonstrated good radiopacity. Therefore, the consitituent elements of filler materials were investigate.
The filler size and structure were observed under scanning electron microscope. Elemental analysis of fillers was made with an electron probe micro analyzer, and the filler substances were identified by powder X-ray diffractometer.
The filler particle size, was less than 40 μm. Silicate glass and/or crystal silica were found in all fillers. ZrSiO4 or YbF was identified in some fillers, and Ba ions were detected in the glass fillers. The resin for inlay including ZrSiO4 was the most radiopaque filler and next was that with Yb ion.
These results suggest that fillers including Zr ion would be preferable for obtaining higher radiopacity in composite resins for inlay.
