Title of article :
Physical-Mechanical Propertiesand Micromorphology of Calcium Cements Exposed to Polyacrylic and Phosphoric Acids
Author/Authors :
Borges, BoniekCastilloDutra Department of Dentistry - Federal University of Rio Grande do Norte (UFRN) - Natal - RN, Brazil , Souza, GustavoFernandesde Department of Dentistry - Federal University of Rio Grande do Norte (UFRN) - Natal - RN, Brazil , Arrais, AnaBeatriz Department of Dentistry - Federal University of Rio Grande do Norte (UFRN) - Natal - RN, Brazil , Ferreira, IsanaAlvares Department of Dentistry - Federal University of Rio Grande do Norte (UFRN) - Natal - RN, Brazil , Aragão, CíceroFlávioSoares Department of Pharmacy - Federal University of Rio Grande do Norte (UFRN) - Natal - RN, Brazil
Abstract :
Toevaluateifphysicalandmechanicalpropertiesofself-curingcalciumhydroxidecementswereaffectedbycontactwithpolyacrylicandphosphoricacids.Materials and Methods.Resin-containing(Life(LF))andresin-free(HydroC(HyC))materialsweresubjectedtopolyacrylicacidconditioningandrinsing(POL);phosphoricacidconditioningandrinsing(PHO);rinsingonly;andnotreatment(n=10).Watersorption/solubility,releaseofhydroxylions(pH),roughness(Ra),andimpactresistancewereevaluated.Additionalsamples(n=1)werepreparedforscanningelectronmicroscopy(SEM)analysisofthesurfacemorphology.Datawereanalyzedbytwo-wayANOVAandTukeyposthoctest(P<005).Results.WatersorptionwassignificantlyhigherforLFwhenincontactwithPHOandlowerforPOL(P<005).ThemeansolubilitywashigherwithPOLforbothcements(P<005).PHOincreasedthemeansurfaceroughnessforHyC(P<001);asignificantdecreasewasnotedforLFaftercontactwithbothacids(P<001).PHOpromotedlowerreleaseofhydroxylionsonbothcements(P<005).ForLF,rinsing,PHO,andPOLpresentedsimilarmorphology,differingfromthecontrolgroup.ForHyC,PHOandPOLpresentedsimilarmorphology,differingfromthecontrolgroup.Conclusions.PHOhadanegativeeffectonthephysicalpropertiesofthecementstested,exceptforthesolubilitytest.POLaffectedroughnessandsolubilityofHyCcement.Clinical Relevance.Clinicalproceduresthatrequirepolyacrylicandphosphoricacidconditioningmustbedonecarefullyonself-curingcalciumhydroxidecementsinordertoavoidnegativeimpactontheirproperties.
Keywords :
Physical-Mechanical Properties , Micromorphology , Calcium Cements Exposed , Polyacrylic and Phosphoric Acids , ANOVA
