4种充填方法对椭圆形根管根尖超填及封闭性能的影响

Evaluation of Apical Overfilling and Sealing with 4 Different Obturation Techniques in Oval-root Canals In Vitro

目的:比较4种根管充填方法对椭圆形根管根尖超填及封闭性能的影响。方法:88颗离体椭圆形单根管前牙于颈部截冠,Mtwo镍钛锉预备根管至35#04锥度,取80颗标本随机分为4组,每组20颗,分别进行GuttaFlow常温流动牙胶根管充填(GuttaFlow组),热牙胶连续波根管充填(热牙胶组),冷牙胶侧方加压根管充填(冷侧压组),iRoot SP单尖法根管充填(iRoot SP单尖组),记录根管充填过程中每组每颗牙的根管超填情况,取每组恰填12颗,采用透明牙染色法检测各组根尖微渗漏情况。结果:常温流动牙胶组和iRoot SP单尖组根管超填率较高。染料渗入长度常温流动牙胶组<热牙胶组<冷侧压组<iRoot SP单尖组。常温流动牙胶组与冷侧压组及iRoot SP单尖组间,热牙胶组与冷侧压组及iRoot SP单尖组间均有显著性差异。结论:在椭圆形根管中,GuttaFlow常温流动牙胶根管充填及热牙胶连续波根管充填具有较好的根尖封闭能力,但GuttaFlow常温流动牙胶根管充填超填率较高。

Objective： To evaluate the apical overfilling and microleakage in oval--root canals, which were obtura- ted vcith GuttaFlow, continuous wave of vertical condensation, cold lateral condensation, and iRoot SP. Methods： Eighty--eight exacted mandibular premolars with single oval--root canals were prepared with MTwo to the 35#04. Eighty teeth were randomly divided into four groups. Each group had 20 teeth, which was obturated with Gutta- Flow, continuous wave of vertical condensation, cold lateral condensation, and iRoot SP respectively. Root canal overfilling in each tooth was recorded. Twelve teeth with good filling were chosen and detected the apical microleak- age with transparent tooth staining. Results： The overfilling of the root canals obturated with GuttaFlow and iRoot SP group had higher overfilling rate. Microleakage results showed： GuttaFlow group 〈 continuous warm gutta-- percha group〈cold lateral condensation group 〈iRoot SP single pointed group. The microleakage between Gutta- Flow group and cold lateral condensation group had significant difference, as well as GuttaFlow group and iRoot SP single point group, warm gutta percha group and cold side group, warm gutta percha group and iRoot SP single point group. Conclusion： GuttaFlow group and continuous warm gutta--percha group have better apical sealing abil- ity in oval--root canals, but GuttaFlow has higher overfilling rate.