title: Influence of a new denture cleaning technique based on photolysis of H(2)O(2) the mechanical properties and color change of acrylic denture base resin.
abstract: The purpose of this study was to evaluate the influence of a disinfection technique based on photolysis of H2O2 on the mechanical properties and color change of acrylic denture base resin. Resin specimens were immersed in 1 M H2O2 irradiated with light-emitting diode (LED) light at 400 nm for 1 week. The immersion duration of 1 week (168 h) corresponded to performing approximately 500 times of 20-min cleaning. Hydroxyl radicals are potent oxidants and they were generated via the photolysis of H2O2. Oxidative damage caused by these radicals included reduced flexural strength and altered color for the acrylic resin. Nonetheless, the degraded flexural strength and altered color of acrylic resin after 500 times of cleaning in the disinfection system would be within clinically acceptable levels.
authors.affiliation: Division of Fixed Prosthodontics, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Nakahara
authors.forename: Akio
authors.initials: A
authors.lastname: Harada
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Yamada
authors.forename: Yu
authors.initials: Y
authors.lastname: Odashima
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nakamura
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Inagaki
authors.forename: Taro
authors.initials: T
authors.lastname: Kanno
authors.forename: Keiichi
authors.initials: K
authors.lastname: Sasaki
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Niwano
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003116:Color; D003764:Dental Materials / Q000737:chemistry*; D003819:Denture Bases; D003820:Denture Cleansers / Q000737:chemistry* / Q000528:radiation effects; D055119:Elastic Modulus; D006244:Hardness; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry* / Q000528:radiation effects; D017665:Hydroxyl Radical / Q000737:chemistry; D007101:Immersion; D008027:Light; D008422:Materials Testing; D016877:Oxidants / Q000737:chemistry* / Q000528:radiation effects; D010084:Oxidation-Reduction; D010782:Photolysis; D018583:Pliability; D058105:Polymerization; D011829:Radiation Dosage; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D003820:Denture Cleansers; D016877:Oxidants; C075051:Acron MC; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide