Temporary filling materials are commonly used in dentistry. However, the important role of these materials is often overlooked because they do not need to last for long. Light-curing temporary materials were introduced, and these materials should show little dimensional change during and after setting. Objectives: To develop a light-curing temporary filling material with little dimensional change and proper strength properties, experimental TEGDMA and HEAM based composites were evaluated. Methods: Light-curing resin matrix made of TEGDMA and HEMA by the weight ratios of 1-3:1 was made, and other components were added including calcium sulfate hemihydrate, calcium sulfate anhydrous, silane treated silica glass powder, polyacrylic-maleic copolymer, absorbent polyacrylic acid and 1-2% of other powders. Specimens were cured with a light-curing unit. Dimensional change after setting by a buoyancy method, compressive and tensile strength (CS, TS), and thermal decomposition by a differential scanning calorimeter up to 70^oC were measured. Results: Most specimens showed shrinkage after storage in air; however some showed expansion in water and the expansion ratio was 1.027-1.087% after 24 h. CS of compositions stored in water for 24 h was 0.93-19.49 MPa, and TS in the same condition was 0.92-11.22 MPa. These strength values were in the similar range of those of commercial hydraulic temporary materials (CS: 1.86-5.69 MPa, TS: 1.47-8.45 MPa). Endothermic peaks of uncured compositions were in the range of 24-33^oC. There was no clear difference in peaks between the cured specimens stored in air and water (28-35^oC in air, 33-35^oC in water). Conclusions: Some compositions, which show expansion after storage in water, can be used as light-curing filling materials.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

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