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Title

Effect of thermocycling on the surface properties of CAD-CAM denture base materials after different surface treatments

Authors
Atalay, Sevda
Çakmak, Gülce
Fonseca, Manrique
Yilmaz, Burak
Published in Journal of the Mechanical Behavior of Biomedical Materials. 2021, vol. 121, 104646
Abstract Purpose: To evaluate the effect of thermocycling on the water contact angle (WCA), surface roughness (SR), and microhardness (MH) of different CAD-CAM PMMA denture base materials after different surface treatments (conventional laboratory polishing, polishing kit, or surface sealant). Materials and methods: Disk-shaped specimens (10 × 2 mm) of 3 different CAD-CAM PMMAs, AvaDent (AV); Merz M-PM (M-PM); Polident (Poli), and a conventional heat-polymerized PMMA (Vynacron) (CV) (n=21) were divided into 3 different surface treatment groups (n=7): conventional laboratory polishing (CLP), polishing with acrylic resin polisher kit (PK), and a surface sealant (Palaseal) (SSC). Stereomicroscopic images were taken both before and after thermocycling. WCA, SR, and MH of all specimens were measured before and after thermocycling and compared by using a 2-way ANOVA (α=0.05). Results: After thermocycling, WCA significantly increased for CLP- or PK -applied (P<.001) specimens of all materials and SSC-applied M-PM (P=.002), SR significantly increased for CLP-applied M-PM (P=.027) and PKapplied Poli (P=.041), and MH significantly decreased for CLP- or PK-applied AV (P = .001, P < .001, respectively), CV (P=.033, P=.023, respectively), and M-PM (P=.003, P=.001, respectively), SSC-applied M-PM (P<.001), and CLP-applied Poli (P<.001). Stereomicroscopic images revealed rougher surfaces for PK-applied specimens. Conclusions: After thermocycling, surface treatment had a significant effect on water contact angle and surface roughness. CLP or PK application resulted in hydrophobic surfaces compared with before thermocycling. CLP or SSC application on CAD-CAM PMMAs resulted in smoother surfaces. Thermocycling lowered the microhardness of all PMMAs, and the decrease was significant in CLP- or PK-applied PMMAs, except for PK-applied Poli.
Keywords CAD-CAM materialsPMMA denturesMicrohardnessSurface roughnessThermocyclingWater contact angle
Identifiers
PMID: 34166873
Full text
Structures
Research group Groupe de recherche Frauke Müller (797)
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(ISO format)
ATALAY, Sevda et al. Effect of thermocycling on the surface properties of CAD-CAM denture base materials after different surface treatments. In: Journal of the Mechanical Behavior of Biomedical Materials, 2021, vol. 121, p. 104646. doi: 10.1016/j.jmbbm.2021.104646 https://archive-ouverte.unige.ch/unige:153897

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Deposited on : 2021-08-17

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