title: Effect of different disinfectants on the microhardness and roughness of acrylic resins for ocular prosthesis.
abstract: BACKGROUND
  Ocular prosthesis materials should have specific properties for their indication and durability; therefore, it is important to investigate their physical behaviour when affected by several disinfectants.
  
  
  OBJECTIVE
  This study evaluated the influence of different disinfecting solutions on the microhardness and surface roughness of acrylic resins for ocular prosthesis.
  
  
  METHODS
  Fifty samples simulating ocular prostheses were fabricated with N1 resin and colourless resin and divided (n = 10) according to the disinfectant used: neutral soap, Opti-free, Efferdent, 1% hypochlorite (HYC) and 4% chlorhexidine (CHX). Samples were stored in saline solution at 37°C and disinfected during 120 days. Both microhardness and roughness were investigated before, after 60 days and 120 days of disinfection and storage. Microhardness was measured using a microhardner and the roughness with a roughness device.
  
  
  RESULTS
  N1 resin showed lower microhardness when compared with colourless resin (p < 0.05). HYC and CHX groups exhibited the highest change of microhardness and roughness values (p < 0.05). An increase in roughness and reduction in microhardness of ocular acrylic resins were observed after both periods of disinfection and storage (p < 0.05).
  
  
  CONCLUSIONS
  Both disinfection/storage periods affected the microhardness and roughness values of the samples.
authors.affiliation: Department of Dental Materials and Prosthodontics, UNESP - Univ Estadual Paulista, Faculty of Dentistry of Araçatuba, University of the State of São Paulo, São Paulo, Brazil.
authors.forename: Amália
authors.initials: A
authors.lastname: Moreno
authors.forename: Marcelo C
authors.initials: MC
authors.lastname: Goiato
authors.forename: Daniela M
authors.initials: DM
authors.lastname: dos Santos
authors.forename: Marcela F
authors.initials: MF
authors.lastname: Haddad
authors.forename: Aldiéris A
authors.initials: AA
authors.lastname: Pesqueira
authors.forename: Lisiane C
authors.initials: LC
authors.lastname: Bannwart
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D002710:Chlorhexidine / Q000737:chemistry; D004202:Disinfectants / Q000737:chemistry*; D005137:Eye, Artificial; D006244:Hardness; D006801:Humans; D006997:Hypochlorous Acid / Q000737:chemistry; D008422:Materials Testing; D058105:Polymerization; D011474:Prosthesis Design; D012915:Soaps / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D004202:Disinfectants; D012915:Soaps; D012965:Sodium Chloride; D006997:Hypochlorous Acid; D002710:Chlorhexidine