The dimensional changes of 4 types commercial luting cements after setting were examined in distilled water, using a developed thermal expansion testing apparatus. The measurements were carried out under three conditions: increasing temperature (from 37°C to 60°C), decreasing temperature (from 37°C to 10°C), and constant temperature (37°C). The results indicated that: (1) the zinc phosphate cement possessed superior dimensional stability after setting; (2) the variation values in dimension of Fuji Ionomer and CBA varied markedly with the specimen thickness tested; and (3) with Fuji Ionomer, this value also varied with the mixing proportion.