The effect of long-term disinfection procedures on hardness property of resin denture teeth

• Published in: Gerodontology 2012-06, Vol.29 (2), p.e571-e576
• Main Authors: Campanha, Nara Hellen, Pavarina, Ana Cláudia, Jorge, Janaina Habib, Vergani, Carlos Eduardo, Machado, Ana Lucia, Giampaolo, Eunice Teresinha
• Format: Article
• Language: English
• Subjects: acrylic resin denture teeth; acrylic resin dentures; Acrylic Resins - chemistry; Acrylic Resins - radiation effects; Chlorhexidine - analogs & derivatives; Chlorhexidine - pharmacology; Composite Resins - chemistry; Composite Resins - radiation effects; Dental Disinfectants - chemistry; Dental Materials - chemistry; Dental Materials - radiation effects; Dentistry; Disinfection - methods; Hardness; Humans; Materials Testing; Methacrylates - chemistry; Methacrylates - radiation effects; Microwaves - therapeutic use; Polymethyl Methacrylate - chemistry; Polymethyl Methacrylate - radiation effects; Polyurethanes - chemistry; Polyurethanes - radiation effects; Radiation Dosage; Sodium Hypochlorite - chemistry; sterilisation; Sterilization - methods; Temperature; Time Factors; Tooth, Artificial; Vickers hardness; Water - chemistry
• ISSN: 0734-0664; 1741-2358
• DOI: 10.1111/j.1741-2358.2011.00520.x

doi: 10.1111/j.1741‐2358.2011.00520.x The effect of long‐term disinfection procedures on hardness property of resin denture teeth Objective:  The aim of the study was to evaluate the effect of long‐term disinfection procedures on the Vickers hardness (VHN) of acrylic resin denture teeth. Material and methods:  Five acrylic resin denture teeth (Vipi Dent Plus‐V, Trilux–T, Biolux‐B, Postaris‐P and Artiplus‐A) and one composite resin denture teeth (SR‐Orthosit‐O) were embedded in heat‐polymerised acrylic resin within polyvinylchloride tubes. Specimens were stored in distilled water at 37°C for 48 h. Measurements of hardness were taken after the following disinfection procedures: immersion for 7 days in 4% chlorhexidine gluconate or in 1% sodium hypochlorite (CIm and HIm group, respectively) and seven daily cycles of microwave sterilisation at 650 W for 6 min (MwS group). In the WIm group, specimens were maintained in water during the time used to perform the disinfection procedures (7 days). Data were analysed with anova followed by the Bonferroni procedure (α = 0.01). Results:  Microwave disinfection decreased the hardness of all acrylic resin denture teeth (p