摘要
目的 研究喇叭口状残根根管重塑对牙根 -桩核联合体抗折性能的影响。方法 标准尺寸的有机玻璃模拟牙根 3 2个分为正常根管组和 3组喇叭口状根管共 4组。喇叭口状根管组分别为光固化复合树脂根管重塑的喇叭口状根管组、银汞合金根管重塑的喇叭口状根管组和对照组 (即未做处理的喇叭口状根管 )。常规铸造桩核修复 ,用磷酸锌粘固粉粘固于根管内 ,软衬材料模拟牙周膜 ,置于生理盐水中浸泡待测。试件用特殊夹具固定在电子式万能实验机平台上并垂直加载 ,加载速度为 1mm/ m in,直至桩核脱出、牙根折裂 ,记录此时载荷大小 ( N)。结果 正常根管组、光固化复合树脂根管重塑的喇叭口状根管组、银汞合金根管重塑的喇叭口状根管组、对照组的抗折载荷均数分别为 2 0 2 .92 N、194.60 N、146.89N、142 .0 9N。显示正常根管组抗折载荷明显高于对照组 ;光固化复合树脂根管重塑的喇叭口状根管组抗折载荷明显高于对照组 ,差异均有显著性 ( P<0 .0 1) ,而正常根管组与光固化复合树脂根管重塑的喇叭口状根管组之间无显著性差异 ( P>0 .0 5 ) ;银汞合金根管重塑的喇叭口状根管组抗折载荷与对照组无显著性差异 ( P>0 .0 5 )。结论 利用适当的材料对喇叭口状根管进行重塑后 ,不但改变了根管的形态 ,还对根管壁进行加厚和加?
Objective To assess the effect of rehabilitation of flared root canal on the fracture resistance of root and post-core system. Methods Thirty-two simulated tooth roots made of polymethyl methacrylate were divided into 4 groups, including the normal root canal group and 3 flared root canal groups. One flared root canal group was rehabilitated by light-cared composite, another group was rehabilitated by amalgam, and the third flared root conal group was not treated. Casting post and core restored every simulated tooth root. Each specimen was embedded in acrylic resin and then fixed in a special jig on the universal load-testing machine. A compressive load was applied at a 90-degree angle to the long axis of the core until fracture, at a crosshead speed of 1mm/min; the maximum of load was recorded. Results The means of load in normal root canal group, light-cared composite rehabilitated group, amalgam rehabilitated group, not treated group were 202.92 N, 194.60 N, 146.89 N, 142 09 N. It was shown that the load of normal root canal group is significantly greater than the load of not-treated group (P<0.01); the light-cared composite rehabilitated group is significantly stronger than the not-treated group (P<0.01), but there is no significant difference between the light-cared composite rehabilitated group and normal root canal group, and no significant difference between the amalgam rehabilitated group and not-treated group (P>0 05). Conclusion The rehabilitation of flared root canal using suitable material not only changes the shape of root canal, but also increases the fracture resistance of root canal because of its thicker and stronger root canal wall which obviously improves the fracture resistance of post and core.
出处
《四川大学学报（医学版）》
CAS
CSCD
北大核心
2003年第3期510-512,558,共4页
Journal of Sichuan University(Medical Sciences)
