Hydrophobic and hydrophilic effects on water structuring and adhesion in denture adhesives

Abstract

Denture adhesives are designed to be moisture-sensitive through the 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 to study a series of hydrophobic and hydrophilic polymeric systems in order to correlate water-structuring behavior with adhesion strength. Adhesive bonding of the more hydrophobic variants was higher than that of a commercial-based control and a more hydrophilic polymer system in both lap shear and tensile configurations. Water-binding data suggested that increasing the hydrophobicity of the maleic acid copolymer substituents led to decreased levels of freezing water. In comparison, increasing the hydrophilic nature of the polymer backbone gave higher levels of freezing water within the hydrated samples. The results of this study emphasize the importance of varying the levels of hydrophobic and hydrophilic components within denture adhesive formulations, alongside the types of water present within the adhesive systems. This phenomenon has shown the potential to fine-tune the adhesive properties and failure mode against poly(methyl methacrylate), surfaces. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1355-1362, 2018.

Dynamics of adhesive systems development in dental practice

“…Это не позволяет врачу быть уверенным в правильности выполнения технологических этапов бондинга [28]. Следовательно, при использовании систем для техники тотального травления сохраняется многоэтапность и сложность технологии, что приводит к гиперчувствительности и развитию осложнений, уменьшению прочности прикрепления к дентину, разгерметизации краевой щели [30][31][32].…”

Co‐Assembly of Biosynthetic Chiral Nematic Adhesive Materials with Dynamic Polarized Luminescence

“…In contrast, PAA demonstrates a relatively high adhesion strength of 0.4 ± 0.1 MPa, facilitated by interfacial hydrogen bonding. [36] The lap shear adhesion strengths of CNC-PAA and CNC-PEI are also much higher on the PET substrate than the best previously reported adhesion strengths for mussel-inspired adhesives (0.3 MPa, poly(N-methacryloyl-3,4-dihydroxyl-L-phenylalanine-co-sulfobetaine methacrylate-co-2-nitro-1,3benzene dimethanol dimethacrylate) [35] ), laminated adhesives (0.2 MPa, graphene oxide), [37] and denture adhesives (0.01 MPa, poly(methylvinylether-maleic acid)/poly(butylvinylether-maleic acid)) [38] (Figure 3d and Table S1, Supporting Information).…”

Composite polyurethane adhesives that debond-on-demand by hysteresis heating in an oscillating magnetic field

“…The butt joint form was used in order to effectively eliminate any vertical sheer 'friction' load from the test results. After cooling, the dog bones were suspended by their top end with the butt bonded central region positioned 13 in the centre of a three-turn solenoidal inductor and a 25 g weight was hung from the bottom end (Figure 5).…”

“…1 H NMR (400 MHz, CDCl3) : 7.15 -7.05 (aromatic H), 6.6 (urethane NH), 5.4 -5.2 (urea NH), 4.25 -4.01 (diol CH2CH2O), 3.4 -3.3 (end group NHCH2CH2), 3.7 -3.6 (end group OCH2CH2), 3.9 -3.8 (MDI CCH2C), 2.5 -2.4 (end group CH2CH2N), 2.1 -0.6 (diol chain H). 13…”

“…[7] Furthermore, responsive adhesives have been produced that exhibit the ability either to heal and rebond two surfaces after fracture or debond-on-demand in response to a specific stimulus. [8][9][10] A broad range of applications may be envisaged for healable and debondable adhesives, for example, in removable prosthetics, [11] dentures [12][13][14] or to facilitate recycling of complex multicomponent products including vehicles and mobile phones.…”