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的液体组分中，选择OXO(表面活性剂)、ACMO(单体)和ESCOURON(香豆酮-吲哚树脂)作为物质。在液体中加入2wt%-OXO使线收缩降低到0.04%，约为基础树脂收缩的1/3。考察了各种金属化合物的加入对包埋物热膨胀的影响。在此基础上，选择了氧化锆和氮化锆作包埋剂。分别添加3.0、3.5、4.0和5.0wt%的ZrC和5.0、5.5、6.0和7.0wt%的ZrN制备包埋剂。所有投资都显示出约0.5%的设定缩水。包埋体的热膨胀随着锆化物含量和加热温度的升高而增加，在室温下冷却后热膨胀保持不变。熔模的抗压强度随锆化物加入量和烧成温度的升高而降低，然后将纯钛浇注到熔模中，烧成后冷却至室温，烧成温度越高，铸件的表面状况越好。表面粗糙度随着锆化物含量的增加而增加。在3.5wt%ZrC-700℃(烧成温度)下，冠的铸造精度为0.21%；在5.5wt%ZrN-700℃下，铸造精度为0.25%；在5.0wt%的ZrN-900型℃中加入14%。在5.0wt%ZRC中，钛铸造牙冠的翅片是由于试件中的裂纹形成的，铸造精度可以通过添加的锆化物来控制。提出了开发新型热膨胀型钛包埋剂的可能性。

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.