Development of new phosphate-bonded investment witout harmful gas and dust

开发无有害气体和粉尘的新型磷酸盐粘合投资

• 批准号: 14370645
• 负责人: TAMAKI Yukimichi
• 金额: $ 4.67万
• 依托单位: SHOWA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14370645/
• 关键词: Phosphate-bonded investment; Cast; Ammonia; Dust-free; Paste

It is well-known that dental investments are composed of fine powders. However, they may cause a respiratory disease if laboratory workers absorb them by mistake when opening the package, weighing and initially mixing at work. Moreover, phosphate-bonded investments may release harmful ammonia gas for human body. The objective of this research was to produce the paste-like phosphate-bonded investments without ammonia. Two pastes (Code: paste1 &, paste2) were prepared prior to test. Pastel was a mixture of cristobalite (average size; 9.2μm, Tatsumori Cor.) and the phosphate (Magnesium dihydrogenphosphate; Yoneyama chem.) liquefied with distilled water of 20cc. Paste2 was MgO (Magnesium oxide #220, Tateho chem.) coagulated by oily compounds. Four (A-D) experimental phosphate-bonded investments (pastel (g)/paste2(g) = A: 79.6/25.5, B: 82/22.5, C: 84.4/19.5, D:86.8/16.5) were designed and their fundamental properties were evaluated. Paste2 was effective to harden the mold and shorten setting time. Compressive strength of A showed 8.65±1.55MPa as green strength and 7.60±0.62MPa as fired strength. A was obviously strongest in the experimental molds. These strength values became smaller alphabetically, and there were significantly differences among A-D by One-way ANOVA (p<0.05). On the other hand, setting time of A was about 8 minutes and shorter than those of B-D. D was found to set after about 13 minutes from mixing. Thermal expansion is depended on the amount of cristobalite including in the mold. In this study, D containing more pastel was advantageous on thermal expansion. The expansion rate was about 1.8% at 900℃. These results suggest that experimental paste-like phosphaie-bonded investments are useful for operators because of complete dust-free and usable properties as dental casting molds. Hence, we need to explore more suitable paste/paste ratio for dental casting molds or evaluate castings obtained from them.

众所周知，牙科包埋料由细粉末组成。然而，如果实验室工作人员在打开包装、称重和最初混合时错误地吸收了它们，它们可能会导致呼吸道疾病。此外，磷酸盐包埋料可能会释放出对人体有害的氨气。本研究的目的是制备无氨型膏状磷酸盐包埋料。在测试之前制备两种糊剂（代码：糊剂1和糊剂2）。粉彩是方石英（平均尺寸; 9.2μm，Tatsumori Cor.）和磷酸盐（磷酸二氢镁; Yoneyama chem.）用20 cc蒸馏水液化。糊剂2为MgO（氧化镁#220，Tateho chem.）被油性化合物凝结。设计了四种（A-D）实验磷酸盐结合包埋料（粉彩（g）/膏2（g）= A：79.6/25.5，B：82/22.5，C：84.4/19.5，D：86.8/16.5），并评价了它们的基本性能。Paste 2可有效地硬化模具并缩短凝固时间。A的压缩强度显示为8.65±1.55MPa的绿色强度和7.60±0.62MPa的烧制强度。A在实验模具中显然是最强的。单因素方差分析表明，A ~ D组间差异有显著性（p<0.05）。另一方面，A的凝固时间约为8分钟，比B-D的凝固时间短。发现D在混合约13分钟后凝固。热膨胀取决于模具中包含的方石英的量。在本研究中，D含有较多的粉彩有利于热膨胀。900℃时膨胀率约为1.8%。这些结果表明，实验糊状磷脂粘结投资是有用的，因为完全无尘和可用的属性作为牙科铸造模具的操作者。因此，我们需要探索更合适的糊剂/糊剂比例用于牙科铸模或评估从它们获得的铸件。

项目成果

Takashiba, S., et al.: "Experimental Ammonia-free Phosphate-bonded Investments Using Mg(H_2PO_4)_2 Solution"Dental Materials Journal. 21・4. 322-331 (2002)

Takashiba, S., et al.：“使用 Mg(H_2PO_4)_2 溶液进行无氨磷酸盐粘合包埋材料的实验”牙科材料杂志 21・4 (2002)。

玉置幸道他: "試作リン酸塩系埋没材によるチタン鋳造"チタンと歯科臨床. 1・1. 31 (2003)

Yukimichi Tamaki 等人：“使用原型磷酸盐包埋材料进行钛铸造”钛和牙科诊所 1・1.31 (2003)。

Takashiba, S., Zhang, Z., Tamaki, Y.: "Experimental Ammonia-free Phosphate-bonded Investments Using Mg(H_2PO_4)_2 Solution"DMJ. 21(4). 322-331 (2002)

Takashiba, S.、Zhang, Z.、Tamaki, Y.：“使用 Mg(H_2PO_4)_2 溶液进行无氨磷酸盐粘合投资实验”DMJ。

Takashiba, S., Zhang, Z., Tamaki, Y.: "Experimental Ammonia-free Phosphate-bonded investments Using Mg(H_2PO_4)_2 Solution"Dental Materials Journal. 21(4). 322-331 (2002)

Takashiba, S.、Zhang, Z.、Tamaki, Y.：“使用 Mg(H_2PO_4)_2 溶液进行无氨磷酸盐粘合投资的实验”《牙科材料杂志》。

Okazaki, Y., Takashiba, S., Zhang, Z., Tamaki, Y.: "Some properties of MgO-NH_4H_2PO_4"Journal of Showa University Dental Society. 23(1). 7-13 (2003)

冈崎，Y.，高芝，S.，张，Z.，玉木，Y.：“MgO-NH_4H_2PO_4的一些性质”昭和大学牙科学会杂志。