路牙石模具分为两种，一种路牙石钢模具，一种是路牙石塑料模具。但是钢模具的使用比塑料模具使用范围广，因为钢模具比塑料模具脱模快，而且寿命也比塑料模具长.
There are two kinds of dental stone moulds, one is steel and the other is plastic. But the use of steel mould is wider than that of plastic mould, because steel mould demoulds faster than plastic mould, and its life is longer than plastic mould.
路牙石模具一般呈凸字形，是塑料颗粒经高温溶化注塑加工而成，原料主要采用聚丙烯，具有无毒、无味，密度小，强度、刚度、硬度耐热性均优于低压聚乙烯,可在100度左右使用。具有良好的电性能和高频绝缘性不受湿度影响。
Roadstone moulds are usually convex shaped, which are made of plastic particles by high temperature melting and injection molding. The raw materials are mainly polypropylene, which is non-toxic, odorless, low density, superior to low-pressure polyethylene in strength, stiffness and hardness, and can be used at about 100 degrees. Good electrical performance and high frequency insulation are not affected by humidity.