Abstract
The authors previously reported that a lining of titanium oxide liquid between a dentine surface and the tip of a laser apparatus was effective for removing decalcified dentine using Nd-YAG laser irradiation.
Clinical tests of the Nd-YAG laser with titanium oxide was considered, but, it is quite difficult to retain the liquid on the surfaces of decade enamel and soft dentine during laser irradiation.
The purpose of this study was to evaluate the effectiveness of removing sound dentine and decalcified dentine using Nd-YAG laser irradiation with interposition of titanium oxide paste, because the property of the paste is allows it to remain on the surface of teeth easily during the laser irradiation.
The mounts of removed dentine by interposition in all kinds of the pastes containing 10%,20%,30%,40%,50% titanium oxide were significantly higher than that using paste without titanium oxide as control, and the amount was increased by the dose of titanium oxide.
In clinic, a selective removal of soft dentine is recommended us ing a laser irradiation, that is to say less removal of a sound dentine is required.
Based on the results, it was found that 10% to 20% concentration of titanium oxide paste is available for use in the clinic. The reason that the concentration paste displayed relatively high removal of a decalcified dentine and less removal of a sound dentine.
