A novel polyurethane-based root canal-obturation material and urethane-acrylate-based root canal sealer - Part 2: Evaluation of push-out bond strengths

作者：Lee Bor Shiunn; Lai Eddie Hsiang Hua; Liao Ken Hsuan; Lee Chung Yi; Hsieh Kuo Huang; Lin Chun Pin^*

来源：Journal of Endodontics, 2008, 34(5): 594-598.

DOI：10.1016/j.joen.2008.02.015

• push-out bond strength
• root canal obturation
• ZnO/TPU composite

We have developed a visible-light curable urethaneacrylate/tripropylene glycol diacrylate (UA/TPGDA) oligomer to serve as a root canal sealer and a zinc oxide/thermoplastic polyurethane (ZnO/TPU) composite to serve as a root canal obturation material. The purpose of this study was to compare the push-out bond strengths of the following 8 groups of materials: (1) Tubliseal + gutta-percha (TB/GP); (2) Tubliseal + Resilon (TB/R); (3) Epiphany + gutta-percha (EP/GP); (4) Epiphany + Resilon (EP/R); (5) EndoREZ sealer + EndoREZ cone (ES/EC) (6) EndoREZ sealer + ZnO/TPU (ES/PU); (7) UA/TPGDA + EndoREZ cone (UA/EC); and (8) UA/TPGDA + ZnO/TPU (UA/PU). Eighty 1-mm-thick root slices prepared from extracted human permanent molars were randomly divided into 8 groups with 10 specimens in each group. Root slices were filled with the above obturation materials, and then push-out test was performed with a universal testing machine. The results showed that the UA/EC and UA/PU groups had significantly higher bond strengths than the other groups.

• 出版日期2008-5