title: Long-term regional bond strength of three MMA-based adhesive resins in simulated vertical root fracture.
abstract: The purpose of this study was to investigate bond durability of MMA-based adhesives to root dentin in a simulated complete vertical root fracture (CVRF). The fractured fragments of human premolar root were reattached using Super-Bond C&B (SB; Sun Medical), M-Bond or M-Bond II (MB or MB II; Tokuyama Dental). After storage for 1 day, 1 month, 6 months and 1 year, the reattached specimens were subjected to microtensile bond strength (µTBS) test at cervical and apical regions. Results showed that µTBS was significantly higher to cervical dentin than to apical dentin in MB and MB II, but not SB (p<0.05). Significant decrease in µTBS was found for MB and MB II after 1 year, whereas no significant difference was found for SB (p<0.05). Analysis of failure mode by SEM indicated differences over time. In conclusion, significant differences were found in the regional bond durability among MMA-based adhesives used to restore CVRF, that may lead to different clinical performances.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. hamid.nurrohman@gmail.com
authors.forename: Hamid
authors.initials: H
authors.lastname: Nurrohman
authors.forename: Toru
authors.initials: T
authors.lastname: Nikaido
authors.forename: Alireza
authors.initials: A
authors.lastname: Sadr
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Takagaki
authors.forename: Shuzo
authors.initials: S
authors.lastname: Kitayama
authors.forename: Masaomi
authors.initials: M
authors.lastname: Ikeda
authors.forename: Kanchana
authors.initials: K
authors.lastname: Waidyasekera
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D001641:Bicuspid / Q000293:injuries / Q000473:pathology; D001896:Boron Compounds / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000473:pathology; D005500:Follow-Up Studies; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D019227:Tooth Apex / Q000473:pathology; D019237:Tooth Cervix / Q000473:pathology; D014082:Tooth Fractures / Q000473:pathology / Q000628:therapy*; D014092:Tooth Root / Q000293:injuries* / Q000473:pathology; D014867:Water / Q000737:chemistry
chemical_list: D001896:Boron Compounds; C112828:Clearfil AP-X; C438313:Clearfil SE Bond; D008689:Methacrylates; D008768:Methylmethacrylates; D011140:Polyurethanes; D019279:Resin Cements; D014867:Water; C029824:urethane dimethacrylate luting resin; D020366:Methylmethacrylate; C005044:hydroxyethyl methacrylate; D019904:Polymethyl Methacrylate; C049495:Super-bond