2020 Volume 39 Issue 3 Pages 254-268
The study examined the effect of specimen thickness on the shear punch strength of dental luting cements. One conventional glass ionomer cement (CGIC), two resin-modified glass ionomer cements (RMGIC), and three self-adhesive resin cements (SARC) were used in this study. Disk specimens with five different thicknesses (0.15～2.00 mm) were prepared for each cement. The shear strengths were determined using a punch tool (n＝10 for each condition). Two-dimensional finite element analysis (FEA) was employed to examine the shear stress distribution in each specimen. Shear strength values of RMGIC and SARC tended to rise with an increase in the specimen thickness, while those of CGIC were independent of the specimen thickness. FEA indicated that the shear stress distribution in specimens for the punch-shear test was affected by the specimen thickness. The specimen thickness was suggested to affect the measured shear punch strength values for the dental luting cements containing resin components.
