クラウン・ブリッジの臨床的適合度 : 前歯部 3 症例における観察

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With increasing precision applied in casting crown prosthodontics in recent years, precision in micrometric degrees has become a requirement for fitness. A crown, a connective crown and a bridge of the anterior faced crown, all of which were prepared and set by one and the same clinician, were obtained without damage together with the teeth. Examination of the clinical fitness of these specimens were therefore made. Examinations were made of the fitness at the restorative crown margin, labio-lingual and mesio-distal sectional surface. Film thickness of cement layer was also measured with the reader scale after enlarging the layer a 100 times by a profile projector. The marginal fit of the cemented crown were far better than the values Murakami, et al obtained from autopsy cases, but fell rather short of the experimental values obtained by Yoshida, et al. The cement thickness of the specimens A, B and C were 284μ, 188μ, and 117μ, respectively, at the marginal portion of crown, and 87μ, 170μ, and 56μ, respectively, at the portion beneath incisal edge. The cause of lowering the fitness of the specimens examined may be attributed to the matters of tooth preparation, impression taking, preparation of die and temporary crown and the fundamental cares to be taken in each stage. The present examination reconfirmed the need and importance of giving due considerations to (1) the method of trimming, (2) deformations at the time of making and extracting wax patterns, imbedding, and casting, and (3) probable inclination at the time of cementation.
九州歯科学会の論文

クラウン・ブリッジの臨床的適合度 : 前歯部 3 症例における観察

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