Finger W, Jørgensen K D, Ono T
Scand J Dent Res. 1980 Apr;88(2):155-8. doi: 10.1111/j.1600-0722.1980.tb01207.x.
The present investigations show that there is no correlation between on the one hand the wet and the dry compressive strength of the three gypsum-bonded investments studied and on the other the compressive strength of the investments at burn-out temperature. The study also demonstrated that there is no correlation between the compressive strength and the fracture resistance of sharp edges of the investment mold when exposed to the impact of the casting alloy entering the mold. The inconveniences caused by the fracture of such edges are prevented by a moderate rounding of the corresponding parts in the preparation.
目前的研究表明，一方面，所研究的三种石膏结合包埋材料的湿抗压强度和干抗压强度，与另一方面在 burnout 温度下包埋材料的抗压强度之间没有相关性。该研究还表明，当包埋模具的尖锐边缘受到进入模具的铸造合金的冲击时，其抗压强度与抗断裂性之间没有相关性。通过在制备过程中对相应部位进行适度倒圆，可以防止此类边缘断裂所带来的不便。
