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[Extraoral post-curing of composite inlays]
1Zentrum für Zahn-, Mund- und Kieferheilkunde der Westfälischen Wilhelms-Universität, Münster.
Deutsche Zahnarztliche Zeitschrift
|May 1, 1991
Summary
Post-curing enhances photocured composites by increasing the degree of cure, particularly in the bulk material. However, this heat treatment has limited effect on the outer layers of the composites.
Area of Science:
- Materials Science
- Polymer Chemistry
Context:
- Photocured composites are widely used in various applications.
- Understanding post-curing effects is crucial for optimizing material properties.
Purpose:
- To investigate the post-curing behavior of photocured composites using differential scanning calorimetry (DSC) and Fourier transform mid-infrared (FTMIR) spectroscopy.
- To determine the extent of heat-induced polymerization and its effect on the degree of conversion.
Summary:
- Differential scanning calorimetry (DSC) revealed a post-curing effect of 3.8% in photocured composites.
- Fourier transform mid-infrared (FTMIR) spectroscopy indicated heat-induced polymerization up to approximately 3%, with one case reaching 15%.
- Heat treatment increased the degree of conversion in the bulk material (deeper than 50 microns) to 75%-79%, but had minimal impact on the outer layers (54%-72% conversion).
Impact:
- The post-curing procedure effectively enhances the bulk properties of photocured composites.
- The findings suggest that the benefits of post-curing are localized and do not significantly improve the surface properties.