title: Evaluation of experimental cleanser solution of Ricinus communis: effect on soft denture liner properties.
abstract: OBJECTIVE
  This study evaluated colour stability, hardness and roughness of soft denture liners after immersion in various cleansers.
  
  
  METHODS
  Thirty specimens (14 mm × 4 mm) of Elite Soft Relining (ES) and Mucopren Soft (MS) were randomly immersed in distilled water at 37°C, sodium hypochlorite 1%, and an experimental Ricinus communis solution (RC) for 7, 15 and 183 continuous days.
  
  
  RESULTS
  anova (p < 0.05) and Tukey's test indicated that after T7 (μ =8.79 ± 7.36); T15 (μ = 4.23 ± 2.62) and T183 (μ = 8.78 ± 3.16), MS presented a higher increase in hardness than ES. After T7, MS underwent an increase in roughness (μ = 0.09 ± 0.80); ES underwent a decrease (μ = -0.08 ± 0.16). RC caused the smallest variation in roughness. After T15, both materials presented an increase in roughness. After T183, ES (μ = -0.30 ± 0.48) presented a higher roughness variation than MS (μ = -0.07 ± 0.32). Hypochlorite caused an increase in roughness (μ = 0.02 ± 0.19).
  
  
  CONCLUSIONS
  After all periods ES presented higher colour alteration than MS; highest colour alteration was caused by hypochlorite. Both materials were more stable after immersion in RC.
authors.affiliation: Department of Dental Materials and Prosthodontics, São Paulo University, Ribeirão Preto Dental School, São Paulo, Brazil. mxpisani@hotmail.com
authors.forename: Marina Xavier
authors.initials: MX
authors.lastname: Pisani
authors.forename: Cláudia Helena Lovato
authors.initials: CH
authors.lastname: da Silva
authors.forename: Helena Freitas Oliveira
authors.initials: HF
authors.lastname: Paranhos
authors.forename: Raphael Freitas
authors.initials: RF
authors.lastname: Souza
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Macedo
mesh_terms: D003116:Color; D003124:Colorimetry; D003764:Dental Materials / Q000737:chemistry*; D003820:Denture Cleansers / Q000737:chemistry*; D003822:Denture Liners; D006244:Hardness; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D028321:Plant Preparations / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D012278:Ricinus; D012833:Siloxanes / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003764:Dental Materials; D003820:Denture Cleansers; D028321:Plant Preparations; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D014867:Water; D012973:Sodium Hypochlorite