根管治疗对椭圆形根管牙根抗折性的影响

牙根纵裂常发生于根管治疗后的牙齿,多见于椭圆形根管。根管治疗的多个环节能改变牙根的抗折性,其中根管预备和根管充填对牙根抗折性的影响较为明显。治疗过程中引入的应力及产生的微裂纹对后续牙根纵裂的发生起了决定性作用。椭圆形根管和圆形根管之间的形态特点以及各自对根管治疗的反应不同,导致两种根管形态的牙根的抗折性也存在较大差异。目前,椭圆形根管在根管治疗后的牙根抗折性变化罕见相关研究。该文就根管治疗对椭圆形根管抗折性的影响作一综述。

Effect of root canal treatment on the fracture resistance of root with oval canals

Vertical root fracture often occurs in the teeth after root canal therapy(RCT), and it is more common in the oval-shaped root canals. The fracture resistance of teeth can be changed by many steps of RCT, especially, root canal preparation and obturation have an obvious effect. The stress introduced and the microcracks produced during the treatment play a decisive role in the subsequent root fracture. In addition to the morphological characteristics between the oval root canal and the circular root canal, their respective responses to RCT result in a big difference in the fracture resistance of teeth. At present, the studies about the changes in the root fracture resistance of teeth with oval root canals after RCT have not been reported. In order to improve the success rate and the prognosis of root canal treatment, it is important to understand the effect of RCT on the resistance of root with oval canals. This article will make a review in this field.