Relatively little is known about the microstructure of cobalt-base alloys in dentistry. Manufacturers of dental cobalt-base alloys have published very little on this subject. No research has been conducted on the microstructure of the cobalt-base alloys used in dentistry. The need for research in this field is recognized, however, by both the manufacturers of the alloys and researchers in the d...

Tracking student performance in preclinical and clinical courses can be helpful in developing and refining a curriculum. Our objective was to correlate student performance on three fixed prosthodontic examinations taken by eighty junior dental students. Examinations included a knowledge-based objective structured clinical examination (OSCE), a manual skills exercise completed on a typodont (Typ...

O F ALL the materials associated with dental practice and technic, those containing gypsum products are probably used most extensively. In keeping with this fact, a great deal of research has been directed toward problems involving the physical behavior of these materials. It is felt, however, that knowledge is lacking on some of the more fundamental behavior characteristics. The manifestation ...

チ タ ンとい う金属 元 素 が発 見 され た の は今 か ら 200年 も前 の こ とに な るが,金 属 チ タ ンが 工 業 的 に 生 産 され る よ うに な って,人 類 の生 活 に役 に立 ち 始 め た の は,第 二 次 世 界 大 戦 後 の こ とで あ る。 チ タ ンが 初 め て 歯科 材 料 と して応 用 され た の は, わ れ わ れ の 知 る範 囲 で は,1968年 に西 ドイ ツの ク ル ップ社 に お い て 開 発 され た チ タン 入 りコバ ル ト ク ロム合 金 クル タ ニ ウ ムで,そ の後,純 チ タ ンを は じめとして各種チタン合金が歯科に導入され, 人工歯根や下顎再建などのインプラント用材料, 矯正用 ワイヤー,支 台築造用 のポス ト,イ ンレ ,ク ラウンブリッジか ら金属床,さ らには抜歯 用の...

STATEMENT OF PROBLEM Oral metal exposure has been associated with systemic and local adverse reactions, probably due to elemental release from the alloys. Although supraphysiological concentrations of salts from dentally applied metals can activate innate cells through TLR4 (Ni, Co, Pd) and TLR3 (Au), whether direct exposure to solid alloys can also trigger innate immune reactivity is still unk...

In this study, the grindability of cast magnetic alloys (Fe-Pt-Nb magnetic alloy and magnetic stainless steel) was evaluated and compared with that of conventional dental casting alloys (Ag-Pd-Au alloy, Type 4 gold alloy, and cobalt-chromium alloy). Grindability was evaluated in terms of grinding rate (i.e., volume of metal removed per minute) and grinding ratio (i.e., volume ratio of metal rem...

The purpose of this study was to determine the galvanic interaction between pure titanium, a CoCrMo alloy, as well as their galvanic interaction with a high copper and a conventional amalgam at different area ratios. Pure titanium, a CoCrMo alloy and two dental amalgams with different copper compositions were tested in this study in 0.9% NaCl environment of pH 7. Polarization curves were record...