第三代表面保護劑塗佈於齒色填補材表面之效果評估

It is known that the glass ionomer used the tooth-colored dental restorative materials in the initial hardening stage has the disadvantagy of allowing water penetration; a coating of a surface protective film is, thus, needed to reduce the initial high sensitivity to wetness. The inherent drawbacks, such as a lack of wear resistance and ease of expansion due to water absorption, usually found in compound resins can effectively be overcome by the use of a protective brightener on the surface of dental restorative materials. A newly light-activated resin composite surface brightener, named Brightener Ⅲ(superscript ®), is introduced and further investigated by testing its mechanical properties in this study. Based on the above investigation, Brightener Ⅲ(superscript ®) is composed of a single homogeneous layer without an inorganic filler. Some separation phenomena exist in the attaching phase between Brightener Ⅲ(superscript ®) and the glass ionomer of the acid-base reaction. Results revealed that the adhesion of its mechanical undercut is not sufficient. In addition, Brightener Ⅲ(superscript ®) formed a good anti-abrasion protective layer and has significantly improved the wear resistance of the 4 filling materials tested due to its coating effect. In summary, the Brightener III(superscript ®) with low viscosity and high mobility enhanced the relative wear resistance of the 4 evaluated materials when compared with the unprotected groups. This light-activated protective film had a strong effect in decreasing the expansion due to water absorption by GI and RMGI. Therefore, application of Brightener Ⅲ(superscript ®) to tooth-colored restorative materials effectively improvd their mechanical properties.