IRM cement, Cavit, Dycal, but also Grossman cement lowers the bonding strength of a composite material to dentin by one-half of the control value.

• 如果根管口直接用暂封膏封闭，唾液通过渗漏的冠边缘或者修复体边缘渗入内部的污染发生率会降低。