title: Bond strength of a chairside autopolymerizing reline resin to injection-molded thermoplastic denture base resins.
abstract: OBJECTIVE
  This study evaluated the shear bond strength of a chairside autopolymerizing reline resin to injection-molded thermoplastic denture base resins.
  
  
  METHODS
  Four kinds of injection-molded thermoplastic resins (two polyamides, a polyethylene terephthalate copolymer and a polycarbonate) and PMMA, as a control, were tested. The eight types of surface treatment: ((1) no treatment, (2) air abrasion, (3) dichloromethane, (4) ethyl acetate, (5) 4-META/MMA-TBB resin, (6) air abrasion and 4-META/MMA-TBB resin, (7) tribochemical silica coating, and (8) tribochemical silica coating and 4-META/MMA-TBB resin) were applied to each specimen. The chairside autopolymerizing reline resins were bonded to disks of the injection-molded thermoplastic denture base resins. All of the specimens were immersed in water for 4 months and then thermocycled for 10,000 cycles in water between 5 and 55°C. The shear bond strengths were determined.
  
  
  RESULTS
  The shear bond strengths of the two polyamides treated using air abrasion, dichloromethane and ethyl acetate and no treatment were exceedingly low. The greatest bond strength was recorded for the polyethylene terephthalate copolymer specimens treated with tribochemical silica coating and 4-META/MMA-TBB resin (22.5MPa). The bond strengths of the other injection-molded thermoplastic denture base resins increased using 4-META/MMA-TBB resin.
  
  
  CONCLUSIONS
  Tribochemical silica coating and 4-META/MMA-TBB resin were the most effective surface treatments among all denture base resins tested.
authors.affiliation: Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan. Electronic address: hamanaka@college.fdcnet.ac.jp.
authors.forename: Ippei
authors.initials: I
authors.lastname: Hamanaka
authors.affiliation: Division of Biomaterials, Kyushu Dental University, Fukuoka, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimizu
authors.affiliation: Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Takahashi
mesh_terms: D001896:Boron Compounds; D001840:Dental Bonding; D003819:Denture Bases; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D009757:Nylons; D058105:Polymerization; D011108:Polymers; D012117:Resins, Synthetic; D033081:Shear Strength; D013696:Temperature
chemical_list: D001896:Boron Compounds; D008689:Methacrylates; D008768:Methylmethacrylates; D009757:Nylons; D011108:Polymers; D012117:Resins, Synthetic; C476987:methylmethacrylate-tributylborane resin; C034139:4-methacryloxyethyltrimellitic acid anhydride
keywords: PMMA; Polyamide; Polycarbonate; Polyethylene terephthalate copolymer; Shear bond strength