title: Evaluation of flexural strength and color stability of different denture base materials including flexible material after using different denture cleansers.
abstract: OBJECTIVE
  Present study aimed at evaluating the colour stability and flexural strength of flexible denture base materials (Valplast) and Polymethyl methacrylate (PMMA) denture base material (Meliodent) processed by two different methods (Injection moulding and compression moulding) after immersing them in three different denture cleansers with acidic, basic and neutral PH.
  
  
  METHODS
  Total 120 specimens (65 × 10 × 3 mm3), 40 specimens of each material (Valplast, Meliodent compression moulding and injection moulding) were immersed in denture cleansers having different PH; Valclean (Acidic), Clinsodent (Basic) and Polident (Neutral) as well as Distilled Water. Color changes were measured with a spectrophotometer after 1 month, 3 months and 6 months of immersion cycle. A flexural 3-point bending test was carried out by using an Instron universal testing machine after 6 months of soaking. Data were analyzed using SPSS software.
  
  
  RESULTS
  Maximum effect on colour stability was noted with Clinsodent followed by Valclean. Least color changes were observed after immersion in Polident. Colour difference was increased significantly as the immersion time increased. For both Meliodent and Nylon resins, statistically significant change in flexural strength occurred with immersion in all denture cleansers. Clinsodent has greater effect as compared to Valclean and Polident.
  
  
  CONCLUSIONS
  Polident and Valclean can be safely used as denture cleanser for both nylon and acrylic resin denture base materials as far as colour stability and flexural strength both are concerned.
authors.affiliation: Department of Prosthodontics and Crown and Bridge, Ahmedabad Dental College and Hospital, Ahmedabad, Gujarat, India.
authors.forename: Vrinda R
authors.initials: VR
authors.lastname: Shah
authors.affiliation: Department of Prosthodontics and Crown and Bridge, Ahmedabad Dental College and Hospital, Ahmedabad, Gujarat, India.
authors.forename: Darshana Nilesh
authors.initials: DN
authors.lastname: Shah
authors.affiliation: Department of Prosthodontics and Crown and Bridge, Ahmedabad Dental College and Hospital, Ahmedabad, Gujarat, India.
authors.forename: Chirag J
authors.initials: CJ
authors.lastname: Chauhan
authors.affiliation: Department of Prosthodontics and Crown and Bridge, Ahmedabad Dental College and Hospital, Ahmedabad, Gujarat, India.
authors.forename: Paras J
authors.initials: PJ
authors.lastname: Doshi
authors.affiliation: Department of Prosthodontics and Crown and Bridge, Ahmedabad Dental College and Hospital, Ahmedabad, Gujarat, India.
authors.forename: Ashish
authors.initials: A
authors.lastname: Kumar
keywords: Acrylic resin; basic and neutral pH; denture cleansers with acidic; flexural strength and color stability; nylon denture base materials