目的：比较再植后两种牙周愈合方式下，纵折牙粘结修复后的抗疲劳强度。
OBJECTIVE: to compare the fatigue resistance of vertical fractured teeth after bonding restoration in two different periodontal healing modes.
碳钢具有高温和低温强度，具有很高的韧度和优异的抗疲劳强度。
Carbon steel has high and low temperature strength is very tough and has excellent fatigue strength.
目的：比较带锁与非带锁颈椎前路钢板螺钉系统的即刻固定和抗疲劳强度。
Objective: To compare the fixation strength of locking and non locking anterior cervical plating initially and after fatigue.
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