A Study of Light Cured Wax Pattern

实验制备了高粘性光固化蜡（HVLW）和低粘性光固化蜡（LVLW）。经475 nm波长光照射硬化后，LVLW的颜色由浅绿色变为赭色。采用JIS-6503或ADA规范No.4对两种实验性光固化蜡、常规镶嵌蜡和两种市售光固化蜡进行了测试。测定了其固化收缩率和划痕硬度。得到了以下结果：光固化的蜡很容易通过手指按压插入预备好的牙腔，可以在这些蜡中雕刻出原始的牙齿解剖结构和固化后的边缘，并且有自由的操作时间。除LVLW外，熔化后的蜡在500‰的温度下蒸发时，按照美国标准规范no .4.3的要求进行测试，没有留下超过原重量0.1%的固体残留物。在34 ~ 45ºC的温度下，蓝色和红色镶嵌蜡的流动值急剧增加，与光固化蜡的低缺陷相比，这些蜡显示出较大的畸变。光固化蜡的线性热膨胀量比传统的蓝色和红色镶嵌蜡小。当光固化蜡被使用时，它被认为是可能形成和去除由热变化和释放或应力引起的低失真蜡图案。HVLW有一个类似的触摸雕刻蜡雕刻蓝色镶嵌蜡，这一事实也得出结论，从划痕硬度测试。与传统的蓝、红镶嵌蜡相比，HVLW具有较高的收缩率。由于其黄色，似乎很难区分模具材料和蜡。不仅要考虑蜡的操作，而且要考虑铸件的精度。用这些实验性光固化蜡制成的铸件将来可用于临床。

The high viscous light cured wax(HVLW) and the low viscous light cured wax(LVLW) were made experimentally. When it hardens by the irradiation of the 475 nm wave length light, the color of LVLW changes from light green to ocher. There two experimental light cured waxs, conventional inlay waxs and two light cured waxs on the market were tested by the instruction of JIS-6503 or ADA specification No.4. The curing shrinkage and the scratch hardness were also measured.The following results were obtained.1. The light cured waxs are very easy to insert into the prepared cavityby finger pressure, possible to carve the original tooth anatomy in these waxs and at the margins after solldification and have free manipulation time.2. The melted waxs except LVLW vaporized at 500ﾟC have left no solid residue in excess of 0.1% of the original weight when tested according to the instruction of ADA specification No.4.3. The values for flow of the blue and red inlay waxs at 34 to 45ﾟC were increased abruptly and these waxs were thoughrt to reveal comparatively large distortion compared with the low flaw of the light cured wax at these temperature.4. The amount or linear thermal expansion of the light cured waxs is smaller than the conventional blue and red inlay waxs. It is thought to be possible to form and remove the low distortion wax pattern resulted from thermal changes and release or stresses when light cured waxs are used.5. HVLW has a similar touch in carving by the wax carver to the blue inlay wax and this fact is also concluded from the scratch hardness test.6. HVLW showed high shrinkage compared with the conventional blue or red inlay wax. It seems to be difficult to distinguish die material and wax because of its yellow color.Not only the manipulation of the wax but the accuracy of the castings shall be considered. The castings made from these experimental light cured waxs shall be clinically applied to the patients in future.