歯冠部歯質が失われた失活歯に対する支台築造に関する研究

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  • 西村 康
    鶴見大学大学院歯学研究科歯科補綴学専攻

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  • A Study on Post and Cores for Endodontically Treated Teeth without Coronal Extension

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Purpose: To determine a desirable type of post-and-core for endodontically treated teeth without coronal extension.<BR>Materials and Methods: A human maxillary central incisor was replicated from bovine teeth with the CELAY system (MIKRONA, Switzerland), which is a new method developed to provide experimental specimen teeth. Five types of root surfaces (I-V), four different post lengths (0, 2.5, 6, 8.5 mm), and three methods of post-and-core fabrication (cast metal post-and-core, prefabricated metal post and composite resin core, composite resin post-and-core) were examined without cyclic loading in 12 conditions and with cyclic loading in 4 conditions.<BR>Results: Root surfaces prepared along the anatomical cervical line with a palatal slope showed higher failure load than those prepared horizontal to the tooth axis. Composite resin post-and-cores with a palatally sloping root surface were the most desirable of all three methods from a combined viewpoint of failure load and mode, though the failure load decreased remarkably with cyclic loading. In contrast, both cast post-and-cores and prefabricated metal post and composite resin cores demonstrated high failure load, but showed poor failure in teeth with unrestorable crowns.<BR>Conclusions: Composite resin post-and-cores with a palatally sloping root surface were the most desirable of all three methods examined, although their longitudinal resistance must be improved.

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