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6 L.A. Casemiro et al.Regarding the impact strength of the controlgroups, QC20 and Lucitone 550 had similar results.The higher impact strength observed for Lucitone550 was already expected as this is considered to bea high-impact material. QC20 and Lucitone 550differed significantly from Onda-Cryl, which presentedthe lowest impact strength (p < 0.05). Theaddition of percentages of 5–10% of IrgaguardB5000 zeolite to QC20 and Onda-Cryl significantlyreduced their impact strength, while the addition of2.5% of silver–zinc zeolite to Lucitone 550 decreasedits impact strength in comparison to thecontrol group.The results of the mechanical tests suggest thatzeolite addition may decrease the flexural and impactstrengths of acrylic resins, which is consistentwith the findings of previous investigations. It isimportant to realise that the conversion degree ofthese materials relating to the amount of residualmonomer, may influence the values obtained 50,54 .Nevertheless, the addition of small percentages ofzeolite to polymethylmethacrylate may be effectiveagainst microorganisms and therefore its impact onmechanical properties may be less significant thanthe potential benefits, especially for patients whodo not follow an adequate denture cleaning protocol9 . The major advantages of this addition couldbe for the elderly people with restricted manualdexterity or cognitive disturbances. A further adverseresult deriving from incorporation of zeolitesto acrylic resins was to increase the opacity ofpolymethylmethacrylate; the higher the percentageof zeolite added to the resin, the greater the opacity.Further studies are required to investigate thepossibility of avoiding this decrease in translucencyof the acrylic resin base containing zeolites so as notto comprise the aesthetics of the prosthesis.ConclusionWithin the limitation of this preliminary study, itmay be concluded that the addition of low percentagesof silver–zinc antimicrobial zeolites topolymethylmethacrylate can be a valuable alternativefor reducing microbial contamination ofacrylic resin denture bases, acrylic baseplates ofremovable orthodontic appliances, myofunctionalplates or other such devices.References1. Radford DR, Challacombe SJ, Walter JD. Dentureplaque and adherence of Candida albicans todenture-base materials in vivo and in vitro. Crit RevOral Biol Med 1999; 10: 99–116.2. Keng SB, Lim M. 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