歯冠部歯質が失われた支台歯のマージン形態が破折強度および破折様相に及ぼす影響

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  • Effects of Margin Designs on Fracture Strength and Pattern of Endodontically-treated Teeth with No Coronal Tooth Structure

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Purpose: To determine the importance of margin design on fracture strength and pattern of endodontically-treated teeth with 0 mm of coronal tooth structure.<BR>Methods: Using the CELAY system (MIKRONA, Switzerland), 168 human maxillary central incisors, identical in size and shape, were replicated from bovine teeth. The fracture strength and pattern of 5 types of margin design, three core materials and two levels of remaining coronal tooth structure were examined after 24 hours of water immersion (37°C) under 16 conditions and 83 hours under 6 conditions without cyclic loading, as well as after 83 hours of water immersion with 300, 000 cyclic loading under 6 conditions.<BR>Results: In the case of cast metal post-and-cores with 0 mm of coronal tooth structure, both beveled and shouldered shoulder margin designs resulted in a higher fracture strength than chamfer and shoulder ones, achieving almost the same strength of chamfer margin design with 1 mm of coronal tooth structure. In addition, pinhole preparation on the root surface increased the fracture strength of chamfer margin design to the level of those of the above-mentioned two desirable margin designs. From a fracture pattern viewpoint, however, all margin designs were unsuitable for re-restoration of the tooth.<BR>Conclusions: Both beveled and shouldered shoulder margin designs improve fracture strength of endodontically-treated teeth with 0 mm of remaining coronal tooth structure.

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