Degree of conversion of bis-acrylic based provisional crown and fixed partial denture materials

. BisGMA has a functional group which does not participate in polymerization. The aromatic double bond of this group (phenyl group) has an absorbance at 1608 cm-1 . This absorbance remains constant before and after polymerization. This method is based on comparing the intensities of the absorbance of carbon-carbon double bonds in methacrylate group before and after polymerization. In aromatic moieties, the absorbance of aromatic double bonds can be used as an internal standard. The purpose of this study was to measure the degree of conversion of three bis-acrylic based provisional crown and fixed partial denture materials by using an infrared spectroscopic method. The null hypothesis to be tested is that there is no significant difference in the degree of conversion among bis-acrylic based provisional crown and fixed partial denture materials.

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