title: Influence of methylmercaptan on the bonding strength of autopolymerizing reline resins to a heat-polymerized denture base resin.
abstract: Effects of methylmercaptan solution (MS), a volatile sulfur compound produced by gram-negative oral microorganisms, on the adhesion of reline denture resins were investigated. For this purpose, a total of 120 disk-shaped specimens prepared from a heat-polymerized denture base resin (Acron) immersed in MS of different concentrations (0.01, 0.1, and 1.0 mol) as well as in purified water as a control at 37 degrees C for 4 weeks. Each of three commercial autopolymerizing reline resins (Rebaron, Mild Rebaron, and Tokuyama Rebase II) was bonded to a specimen. The shear bond strength tests were conducted for the specimens, with and without the application of a primer. The bond strength with 1.0 mol MS was significantly lower than those with other solutions (p < 0.05). The primer application had a significant positive effect on the bond strength. The debonded Acron surfaces showed evidence of incomplete polymerization. The results suggested a potential adhesion-inhibiting effect of the MS on relined dentures.
authors.affiliation: Department of Removable Prosthodontics, School of Dentistry, Iwate Medical University. takuyaoh@iwate-med.ac.jp
authors.forename: Takuya
authors.initials: T
authors.lastname: Ohkubo
authors.forename: Makoto
authors.initials: M
authors.lastname: Oizumi
authors.forename: Takuya
authors.initials: T
authors.lastname: Kobayashi
mesh_terms: D000180:Acrylic Resins; D003799:Dental Stress Analysis; D003819:Denture Bases / Q000382:microbiology; D003823:Denture Rebasing; D008422:Materials Testing; D019904:Polymethyl Methacrylate; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D013438:Sulfhydryl Compounds / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D013438:Sulfhydryl Compounds; C005231:methylmercaptan; D019904:Polymethyl Methacrylate