The grinding and polishing efficiency of self-glazed zirconia and Zenostar zirconia, prepared by wet and dry approaches, respectively, were evaluated. Each sample was divided into two subgroups (n = 5). One was ground, and the other was polished by following the clinical adjustment protocol. Statistics were analysed by independent t-test to a significance level of p < .05. More material was ground off in self-glazed zirconia than in Zenostar zirconia (p < .05) during the same period, especially during the coarse grinding procedure (p < .05), whereas the grinding efficiency in fine grinding stage was not significantly different (p > .05). The polishing efficiency of the whole and of the fine polishing procedure of the two kinds of zirconia was significantly different (p < .05). It thus can be concluded that grinding and polishing efficiency of a novel self-glazed zirconia is significantly higher than that of the conventional Zenostar zirconia. ARTICLE HISTORY