Conclusion Fabricating complete metal occlusal pad, though the difficulty coefficient is big, is still a good dental clinical restoration method at present.
结论：制作全口金属牙合垫修复牙列磨损及缺失，虽然难度系数较大，但目前仍不失为一种良好的齿科临床修复方法。
METHODS:After the primary and additional factors related to technic difficulties in root canal therapy had been wholly considered, the formula for calculation the difficulty coefficient was set up.
方法：综合考虑根管治疗术中操作相关的基本因素和附加因素，设计了难度系数的计算公式。
METHODS:After the primary and additional factors related to technic difficulties in root canal therapy had been wholly considered, the formula for calculation the difficulty coefficient was set up.
方法：综合考虑根管治疗术中操作相关的基本因素和附加因素，设计了难度系数的计算公式。
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