The effect of different reinforced glass ionomer restorative cement on vital tooth structure.

The study was carried out on twenty-one contralateral pairs of caries free, premolars, that were indicated for extraction in conjunction with orthodontic treatment. The study was carried out on a Human male ranging in age from 12-22 y. Three different restorative reinforced glass ionomer cements were investigated two of them were commercial (chelon silver and legend silver) and experimental stainless-steel reinforced one. Three groups each formed of seven persons, the right side premolars used as control and the left side premolar received the investigated material. The experimental and its control tooth were extracted after four weeks of placement the filling materials. The enamel samples in the control and experimental teeth was obtained and prepared for x-ray diffraction analysis, then the teeth were prepared for histologic study. The x-ray diffraction analysis of the enamel samples revealed that, the intensity of fluorapatite was highest in the legend silver group, and the stainless-steel group was less than legend silver but higher than control and chelon silver specimens. Subsequently, the order of fluoride release was L > E > Ch & C. The histologic finding of this study showed that all the reinforced glass ionomer materials under investigation were non irritant to pulp tissue.