On conditions of heigh of dentin being enough, it is meanless to reserveresidual dentin which is less than 1/2 of crown from stress analysis.

• 在后牙牙体高度足够的条件下,当其水平向牙体剩余量少于1/2时,对于剩余牙体组织量的保护从应力学力值分析的结果来看并无太大意义。