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| Azevedo, Nuno Monteiro |
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An, Yiran
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article
Hydrophobic and Hydrophilic Effects on Water Structuring and Adhesion in Denture Adhesives
Abstract
Dentureadhesivesaredesignedtobemoisture-sensitivethroughthe inclusion of a blend of polymer salts with varying degrees of water-sensitivity. This enables the adhesive to mix with saliva in vivo and activate its high tack, through the formation of a mucilaginous layer. We report for the first time, the use of differential scanning calorimetry (DSC) to study a series of hydrophobic andhydrophilicpolymericsystemsinordertocorrelatewater-structuring behavior with adhesion strength. Adhesive bonding of the more hydrophobic variantswashigherthanthatofacommercial-basedcontrolandamore hydrophilicpolymersysteminbothlapshearandtensileconfigurations. Water-binding data suggested that increasing the hydrophobicity of the maleic acidcopolymersubstituentsledtodecreasedlevelsoffreezingwater.In comparison, increasing the hydrophilic nature of the polymer backbone gave higher levels of freezing water within the hydrated samples. The results of this studyemphasizetheimportanceofvaryingthelevelsofhydrophobicand hydrophiliccomponentswithindentureadhesiveformulations,alongsidethe typesofwaterpresentwithintheadhesivesystems.Thisphenomenonhas shownthepotentialtofine-tunetheadhesivepropertiesandfailuremode against poly(methyl methacrylate), PMMA, surfaces.