多年来,用铸造桩核作为根管治疗后的牙冠修复。近来,应用针固位复合树脂核已成为恢复牙冠而采用的普遍方法。本文目的是在模拟的(牙合)负荷几何学和负荷速度接近生理(牙合)负荷速度的情况下,比较铸造桩核和针型树脂核抵抗移位或折裂的能力。材料和方法:取三组十对无龋的中切牙、侧切牙和尖牙,从与牙长轴成垂直的方向, For many years, the use of cast post-core as a root canal treatment of crown restoration. Recently, the application of needle retention composite resin nucleus has become a common method used to restore the crown. The purpose of this paper is to compare the ability of cast post and pin-type resin cores to resist displacement or fracture under simulated (occlusal) load geometry and load speeds approaching physiological (occlusal) load speeds. MATERIALS AND METHODS: Three groups of ten caries-free incisors, lateral incisors and canines, were taken from the direction perpendicular to the long axis of the tooth,