title: A novel polyurethane-based root canal-obturation material and urethane-acrylate-based root canal sealer-part 2: evaluation of push-out bond strengths.
abstract: We have developed a visible-light curable urethane-acrylate/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.
authors.affiliation: School of Dentistry & Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, Taipei, Taiwan.
authors.forename: Bor-Shiunn
authors.initials: BS
authors.lastname: Lee
authors.forename: Eddie Hsiang-Hua
authors.initials: EH
authors.lastname: Lai
authors.forename: Ken-Hsuan
authors.initials: KH
authors.lastname: Liao
authors.forename: Chung-Yi
authors.initials: CY
authors.lastname: Lee
authors.forename: Kuo-Huang
authors.initials: KH
authors.lastname: Hsieh
authors.forename: Chun-Pin
authors.initials: CP
authors.lastname: Lin
mesh_terms: D000179:Acrylates / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003806:Dentin Permeability; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011140:Polyurethanes / Q000737:chemistry; D011409:Propylene Glycols / Q000737:chemistry; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D015034:Zinc Oxide
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; D003188:Composite Resins; D011140:Polyurethanes; D011409:Propylene Glycols; D012387:Root Canal Filling Materials; C050845:urethane acrylate; C105815:tripropylene glycol diacrylate; D015034:Zinc Oxide