Clinical Evaluation of The Handling Properties of Photo-activated Composite Resin Pastes

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  • Kamiunten Osamu
    Division of Occlusion and Maxillofacial Reconstruction, Department of Oral Functional Reconstruction, Science of Oral Functions, Kyushu Dental College
  • Inoue Katsuichiro
    Biomaterials Research Laboratory
  • Masumi Shin-ichi
    Division of Occlusion and Maxillofacial Reconstruction, Department of Oral Functional Reconstruction, Science of Oral Functions, Kyushu Dental College

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  • 光重合型コンポジットレジンペーストの操作性に関する臨床的評価

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The purpose of this investigation was to examine the relationship between measured values (rheological properties) of composite pastes, such as viscosity coefficient, peeling rate and external force (objective measurements), and a favorable property of such pastes discriminated by touch by dentists (subjective measurements). The rheological properties were examined using a balance beam plastometer. The subjective measurements were performed by eighteen young dentists and repeated four times. The subjective measurements related to four characteristics;hardness of paste (A), retention of shape (B), self-bonding properties (C) and release properties from an instrument for filling (D). There was a significant correlation between the log of the external force (log F) and the log of the peeling rate (logν) in all materials (r=0.950~0.997). A moderate correlation in all materials, except Degufill ultra, Heliomolar, Litefil IIA and Silux plus was also found between the log of the coefficient of viscosity (logη) and logν (r=0.870~0.995). The coefficient of correlation obtained from regression lines between the ratios of favorable properties (log PA, log PB and log PD) in the subjective test and log F or logηshowed a good approximation with a quadratic equation.

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