Objectives: The human roots were used in breaking tests of post core system. In these experiments due to individual differences in human teeth, varying breaking loads make it difficult to compare and analyze test results. Therefore, we needs a homogeneous artificial dental root model which resembling both configuration and a material in human dental roots. Through the use of the CELAY system, we produced an artificial dental root models by copy grinding with bovine teeth and composite block in previous paper. The bovine models resembled the human root in the breaking strength and a fracture mode. This study investigates a comparison between the human root and corresponding bovine model on the breaking strength and fracture mode in different dimension. Methods: Five corresponding copy grinding bovine root were prepared using five extracted human incisors roots each other. The dimension of human roots is about length ranging from 14.5 to 17.2mm with width ranging from 5.8 to 6.6mm.Both human dental roots, and models were core build up to identically shaped cast post core systems. The core build up sample was loaded at an angle of 59 °, at a crosshead speed of 0.5 mm/min. Results: The breaking strength are about ranging from 74.2 to 127.1 kgf in human root and ranging from 65.7 to 127.8 kgf in model. After plotting on a scatter diagram, it was found that the human dental roots and the models showed a 1:1 correspondence (The correlation coefficient is 0.92). There were some differences in the fracture mode among the human teeth in difference configuration and dimension. However the fracture mode was almost similar in the human dental roots and models that have same configuration and a dimension. Conclusions: These findings suggest that artificial root models made by copy-grinding bovine teeth are useful in determining the fracture mode of breakage in core buildup materials.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the IADR/AADR/CADR 80th General Session (March 6-9, 2002)

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