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Solidification of Be-free Ni-based dental alloy

Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2227-2236页

作者： Franc ZUPANIC Carlos A.NUNES Gilberto C.COELHO Paula L.CURY Gorazd LOJEN Tonica BONCINA Faculty of Mechanical Engineering University of Maribor2000 MariborSlovenia Department of Materials Engineering School of EngineeringUniversity of Sao Paulo12602-810 LorenaSao PauloBrazil

A novel, Nb- and Si-rich and Be-free Ni-based alloy was cast by two methods of investment casting and continuouscasting to study the microstructure evolution during solidification and its mechanical properties. The solidification of the alloy startedwith the primary crystallization of FCC-γ, followed by a binary eutectic reaction, with the formation of a heterogeneous constituent：FCC-γ＋G-phase, which replaced the low-melting eutectic （FCC-γ＋NiBe） in the Be-bearing alloys. AlNi6Si3 and γ′ formed during theterminal stages of solidification by investment casting, while the formation of AlNi6Si3 was suppressed by continuous casting. TheScheil solidification model agreed very well with the experimental results.

关键词： solidification nickel alloy continuous casting investment casting microstructure dental alloy

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Electron Probe Microanalysis of Exogenous Pigmentation of Oral Mucosa Originating from dental alloy: Two Case Reports

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Open Journal of Stomatology 2016年第4期6卷 120-126页

作者： Akinori Funayama Toshihiko Mikami Kanae Niimi Hiroyuki Kano Yutaka Nikkuni Manabu Yamazaki Tadaharu Kobayashi Division of Reconstructive Surgery for Oral and Maxillofacial Region Niigata University Graduate School of Medical and Dental Sciences Niigata Japan Division of Oral and Maxillofacial Surgery Uonuma Kikan Hospital Minamiuonuma City Japan Division of Oral and Maxillofacial Radiology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan Division of Oral Pathology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan

Pigmentation of the oral mucosa is relatively common and has a wide variety of etiologies. Although most pigmented lesions of the oral mucosa are associated with deposition of melanin and accidental displacement of a dental alloy, accurate differential diagnosis of a pigmented lesion is important, especially in the case of malignant melanoma. We report two cases of oral mucosal pigmentation associated with accidental displacement of a dental alloy in which malignant melanoma was suspected. Excisional biopsy was carried out in these cases with the incision line set at approximately 5 mm from the lesions. Histopathologically, brownish foreign substances were observed in the lamina propria. Metal quantitative analyses of the extracted specimens were carried out by electron probe microanalysis (EPMA). The metal components and the mass concentration revealed that the metals were derived from a dental casting silver alloy in Case 1 and from a gold-silver palladium alloy in Case 2. Although exogenous pigmentation originating from a dental alloy is not rare, differential diagnosis of oral pigmented lesions is sometimes very difficult. In such cases, histopathological examination may be necessary for the diagnosis to exclude melanocytic lesions and EPMA may be effective to identify the causative dental alloy.

关键词： Intraoral Pigmentation Oral Melanoma dental alloy Oral Mucosa

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