EVALUATION OF THE EFFECT ON SURFACE ROUGHNESS OF FELDSPATHIC AND LITHIUM DISILICATE GLASS PORCELAIN OF THE DIFFERENT SURFACE TREATMENTS

Aim: the purpose of this study was to evaluate the effects of different surface treatments on the surface roughness of different dental porcelains. material and methods: two hundred eighty(280) porcelain blocks specimens 6 x 2 x 13 mm) were prepared for each feldspathic porcelain (matchmaker, heraceram, vitavmk 95) and lithium disilicat based glass ceramic (ips empress 2). the prepared speci- mens were divided into 7groups (n=10) representing different surface treatments including sandpaper(s), rubber (r), sof-lex finishing kit (sl), hp paste(p), autoglaze(g), overglaze (og) and dual ion exchanging (ie).the surface roughness of all groups was measu- red with a profilometer. the data were analyzed with one way analysis of variance (anova) and the mean values were compared by the tukey honestly significant difference(hsd) test at 5% significance level (p0.05).the surface roughness (ra) values were ordered from the lowest to the highest value, which were group p, g, og, sl, s, r and ie respectively when comparing the 4 different porcelain materials, the surface roughness (ra) values were ordered from the lowest to the highest value as follows, vita vmk 95, heraceram, matchmaker and ips empress 2. conclusion: the surface treatment methods showed significant difference between various dental ceramics. it was determined that hp paste was a practical and suitable material for clinical use.