Hassanloo A, Watson P, Finer Y, Friedman S
Department of Endodontics, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada.
Int Endod J. 2007 Aug;40(8):633-43. doi: 10.1111/j.1365-2591.2007.01261.x.
To assess the efficacy of retreatment of canals filled with the Epiphany System with and without solvent, with particular reference to the extent of canal enlargement during retreatment.
Sixty roots with canals prepared to apical size 45 were embedded in resin blocks and sectioned vertically. Digital micrographs of canal walls were captured. Roots were re-assembled and filled with Epiphany/Resilon (experimental) or gutta-percha/AH Plus (control). After 8 weeks, canals were retreated to size 45 with or without chloroform, and the time recorded. Roots were split, imaged, re-assembled, retreated to size 55, split and imaged. Root-filling residue, traced at three canal levels, was expressed as percentage of canal surface.
Residue percentage was greater (t-test, P < 0.01) in the experimental group than in the control. Most residue in all specimens was in the apical third (ANOVA, P < 0.01). Chloroform and enlargement to size 55 decreased residue in both groups (t-test, P < 0.01). Retreatment time was longer in the experimental group (P < 0.05), and reduced by chloroform in both groups (P < 0.05).
The Epiphany System was retreatable with and without chloroform, with lesser efficacy than gutta-percha and AH Plus sealer.
评估使用和不使用溶剂对采用Epiphany系统充填的根管进行再治疗的效果，特别关注再治疗过程中根管扩大的程度。
将60个根管预备至根尖尺寸45的牙根包埋于树脂块中并垂直切片。拍摄根管壁的数字显微照片。将牙根重新组装，并用Epiphany/Resilon（实验组）或牙胶/AH Plus（对照组）充填。8周后，使用或不使用氯仿将根管再治疗至尺寸45，并记录时间。将牙根劈开、成像、重新组装，再治疗至尺寸55，劈开并成像。在三个根管水平追踪根管充填残渣，以根管表面积的百分比表示。
实验组的残渣百分比高于对照组（t检验，P<0.01）。所有标本中大部分残渣位于根尖三分之一处（方差分析，P<0.01）。氯仿和扩大至尺寸55均减少了两组的残渣（t检验，P<0.01）。实验组的再治疗时间更长（P<0.05），两组中氯仿均缩短了再治疗时间（P<0.05）。
无论有无氯仿，Epiphany系统均可再治疗，但其效果低于牙胶和AH Plus封闭剂。
