Authors: L SilaghiDumitrescu D Dadarlat M Streza T Buruiana D Prodan I Hodisan C Prejmerean
Publish Date: 2013/12/10
Volume: 118, Issue: 2, Pages: 623-630
Abstract
Giomers represent a new concept in restorative dentistry based on novel prereacted glass technology where special glassionomer fillers are included in the resin matrix A series of resin matrices based on 22bis2hydroxy3methacryloxypropyl bisGMA phenylpropane and 16bismethacryloxy2ethoxycarbonylamino—UDMA 244trimethylhexane as base monomers and triethyleneglycol dimethacrylate TEGDMA/2hydroxyethyl methacrylate HEMA as diluting monomers have been prepared and investigated together with commercial Beautifil II giomer and three adhesives one commercial and two experimental The photopyroelectric PPE calorimetry in both front and back BPPE detection configurations was applied to measure the dynamic thermal parameters of the investigated materials The BPPE configuration together with the frequency scanning procedure was used to directly measure the thermal diffusivity of the primer and the bounding materials as well as the UDMA/HEMA and TEGDMA/bisGMA mixtures The results indicate that the values of the thermal parameters of the materials prepared in our laboratory 695 × 10−8 m2 s−1 α 1293 × 10−8 m2 s−1 are close to those of the corresponding commercial materials 1163 × 10−8 m2 s−1 α 1201 × 10−8 m2 s−1 For the commercially available giomer Beautifil II the values of the thermal diffusivity α = 819 × 10−8 m2 s−1 and effusivity e = 960 W s1/2 m−2 K−1 indicate a good thermal biocompatibility of the material
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