光重合型コンポジットレジンの収縮荷重計測

抄録

The polymerization shrinkage of a light cure composite resin was studied using artificial cylindrical cavities fabricated in stainless steel plates. The shrinkage force was measured using a load-cell inserted as the bottom of the cavity from the back side of the plate. The resin was filled into the cavities after prepared with a bonding agent and then irradiated with a visible-light curing unit. The shrinkage force was measured as functions of time and the depth of the cavity. The cavities with constrained surfaces were also employed to study the effect of boundary condition, and the following results were obtained. The force increased greatly due to the irradiation and slightly increased with time after the irradiation. The force increased gradually with the cavity depth, and exhibited the maximum value and then decreased gradually. The cavities with constrained surfaces yielded much larger forces than the ones with the free surface condition for the same depths.