金属焼付ポーセレンの熔着に関する実験的研究 : 微小焦点 X 線源による観察(第 1 報)

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In the daily clinical work in recent years, the use of porcelain bonded to metal crown seems to be better for the reasons of its esthetics and superior strength, compared with other restoration materials. Porcelain, however, breaks off from its metal base occasionally for some reason. It is also a fact that the countermeasures are problematical. Due consideration therefore must be given to the matter of bonding of metal and porcelain. A number of studies on bond, using a variety of measuring apparatus, have been reported to date. The matter, however, has yet been crarified sufficiently. The authors made test pieces, 1mm×4mm×4mm, by casting Degudent. Sand blasting was used for the polishing. The test pieces were grouped into hydrofluoric acid-treated group and alcohol-treated group. Experiments were conducted for different degree of vacuum during degassing and different time of retention at a given temperature and observation of changes on the metal surface was made with Fine Focus X-ray Generator. Spacing of crystal lattice of metal was calculated and identification of crystal structure was made by converting the Debye-Scherrer-Rings photographed on the X-ray films by Bragg's diffraction formular : 2d sinθ=nλ. The following results were obtained : 1. Usefulness of Fine Focus X-ray Generator in clarifing bonding mechanism was suggested. 2. It became known that hydrofluoric acid, degree of vacuum and retention time affected the metal surface. 3. Au classified in as Miller's indices 111, 200, 311, and 222, analyzed in all experiment groups. 4. Debye-Scherrer-Rings for the other classifications appeared in some cases but did not appear in other cases. Whether these are compounds or single crystals still remains to be investigated.
九州歯科学会の論文
1978-01-31

金属焼付ポーセレンの熔着に関する実験的研究 : 微小焦点 X 線源による観察(第 1 報)

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