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The purpose of the present work was to study the effect of two-step sintering of a commercial powder (Zpex Smile, Tosoh Corp., Tokyo, Japan) on the whole grain size and translucency of zirconia for usage in porcelain crowns. Examples had been sintered at an initial step temperature (T1) of 1300, 1375 and 1400 °C for 5 min, accompanied by a decrease to your 2nd action temperature (T2) and holding at T2 for 5-20 h. Samples had been also conve