Abstract
To modify the properties of PMMA/MMA-TBB resin cement, I investigated the influences of PMMA with different powder characteristics on the properties of the resin cement such as setting time, working time, and cement film thickness. The cement properties were influenced by molecular weight, molecular weight distribution, particle size and shape of the powders. Among these factors, molecular weight distribution was suggested to be especially important. Pulverizing the spherical PMMA powders provided some variations in the cement properties but these variations were limited. However, the pulverized powders blended with small PMMA beads were effective in increasing working time and minimizing film thickness over prolonged period.Thus, this type of the PMMA blend was suggested to make a useful MMA-TBB resin cement with good adhesiveness to dentin, improved working property, reduced upheaving, and easy removability of excess.
