When endodontic dowels were in stalled in standardized moels, direct comparisons of stress distributing properties were analysed through photoelastic stress analysis.

• 本研究是藉由光弹应力分析法来分析临床上经常使用的一种现成螺旋根柱，比较观察其长度及直径大小对于所产生的应力之影响。