Titanium superstructure by a resin pattern material with non-polymerization shrinkage and a thermal expansion typed investments

将三种不同的化学物质添加到自固化丙烯酸树脂（Pattern resin， GC）的液体组分中。选择表面活性剂OXO、单体ACMO和香豆素树脂ESCOURON作为物质。在液体中加入2 wt%-OXO可使线性收缩率降至0.04%，约为碱性树脂收缩率的1/3。研究了各种金属化合物的加入对投资（Selevest D）热膨胀的影响。然后选择ZrC和ZrN作为投资添加剂。分别添加3.0、3.5、4.0和5.0 wt%的ZrC和5.0、5.5、6.0和7.0 wt%的ZrN。所有投资都显示出约0.5%的收缩。随着Zr化合物添加量的增加和加热温度的升高，熔模的热膨胀增大，室温冷却后仍保持不变。浇注料的抗压强度随Zr化合物的加入量和烧结温度的升高而降低。然后，将纯钛浇铸到这些投资模具中，将其烧制并冷却到室温。高烧成温度下的铸件表面状况优于低烧成温度下的铸件。表面粗糙度随Zr含量的增加而增加。铸冠在3.5wt%ZrC-700℃（烧成温度）下的铸造精度为0.21%，在5.5wt%ZrN-700℃和0.5 wt%ZrN-700℃下的铸造精度为0.25%。14%, 5.0wt%ZrN-900℃。在5.0wt%ZrC中，钛铸冠有翅片，这是由于熔模裂纹而形成的。Zr化合物的添加量可以控制铸件的精度。提出了开发新型热膨胀型钛材的可能性。

Three different chemical substances were added to a liquid component of a self-curing acrylic resin (Pattern Resin, GC).OXO (surfactant), ACMO (monomer) and ESCOURON (coumarone-indene resin) were selected as substances. The addition of 2 wt%-OXO to liquid reduces linear shrinkage to 0.04 %, about 1/3 of the shrinkage of the basic resin.The effect of the addition of various metallic compounds on thermal expansion of an investment (Selevest D) was examined. Then, ZrC and ZrN were selected as additives to the investment. Investments added 3.0, 3.5, 4.0 and 5.0 wt% of ZrC and 5.0, 5.5, 6.0 and 7.0 wt% of ZrN were prepared. All investments showed setting shrinkage of about 0.5%. The thermal expansion of investments increased with the amount of Zr compounds and heating temperature, and remained after cooling at room temperature. The compressive strength of investments decreased with the amount of Zr compounds and firing temperature.Then, pure titanium was cast into these investment-molds, which were fired and cooled down to room temperature.The surface condition of castings into higher firing temperature was better than that into lower firing temperature. The surface roughness increased with the amount of Zr compounds. The casting accuracy of crowns were 0.21% in 3.5wt%ZrC-700℃ (firing temperature), 0.25% in 5.5wt%ZrN-700℃ and 0. 14% in 5.0wt%ZrN-900℃. In 5.0wt%ZrC, titanium cast crowns had fins which was formed as a result of cracks in the investment.The casting accuracy could be controlled by the addition content of Zr compounds. The development of new thermal expansion typed investment for titanium was suggested to be possible.