2016 Volume 59 Issue 2 Pages 161-168
Purpose: The aim of this study was to evaluate the polymerization shrinkage and mechanical properties of self-adhesive resin cements, and to compare them with those of conventional resin cements.
Methods: Four commercially available self-adhesive resin cements and three conventional resin cements were used. Polymerization shrinkage was determined by using a water-filled dilatometer. Inorganic filler loading and thermal expansion were also measured. SEM observations of cured cement specimens were carried out.
Results: The average inorganic filler contents of the self-adhesive resin cements ranged from 55.3 to 66.9 wt%, and those of conventional resin cements ranged from 63.2 to 67.9 wt%. The highest inorganic filler content was obtained from EC, whereas GL showed the lowest value of all the test materials, and these differences were statistically significant. The average coefficients of thermal expansion of the self-adhesive resin cements ranged from 37.7 to 51.6×10−6/°C, and those of conventional resin cements ranged from 37.2 to 56.5×10−6/°C. The polymerization shrinkage of the tested resin cements after 480 s ranged from 2.14 to 4.30 vol%. GL and EC showed significantly lower volume than the other resin cements. From the SEM observations, differences in filler particle size, shape, and distribution were clearly observed.
Conclusion: From the results of this study, although polymerization shrinkage depended on the resin cement materials, self-adhesive resin cements showed similar or higher polymerization shrinkage than the conventional resin cements.
