Evaluation of surface treatments by self glaze, over glaze and a polishing agent on the porcelain surface modified with diamond rotary instrument-an in vitro study

The purpose of this study is to evaluate effect a) Self glaze b) Over and c) Polishing on porcelain surface which subjected grinding with a diamond rotary instrument. To test theory 40 ceramic fused metal disc samples were fabricated. material used was Ivoclar Dsign. discs 10mm X 3mm 2mm substructure 1mm porcelain. specimens divided into four groups 10 each. first group left as fired or unglazed. remaining three modification sintered bur at 15000 rpm per minute even pressure. Each the treated polishing paste, self overglaze respectively. all evaluated under optical microscope scanning electron microscope. Optical observation revealed that Group-I (as fired) had appearing be pitted, rough irregularities there no evidence cracks. Group II (polished bur) appeared very smooth.