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

Atalay, Sevda; Çakmak, Gülce; Fonseca, Manrique; Schimmel, Martín; Yılmaz, Burak

doi:10.1016/j.jmbbm.2021.104646

Cited by 31 publications

(32 citation statements)

References 41 publications

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“…The clinical performance of the soft denture liner depends on a strong bond between the two components [ 21 ]. The major reason for bond failure could be related to the main structural differences in the chemical composition of the liner and the denture base, as well as the lack of chemical interactions between them [ 30 , 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…Although certain materials’ bond strengths diminish as a result of internal stress at the denture-liner interface, the bond strengths of others remain stable or may improve as the cross-linking process continues [ 30 ]. The materials in this study were subjected to 1000 cycles corresponding to one year of clinical service [ 21 ]. This was deemed adequate for the study because durable denture liners are shown to have a maximum lifespan of one year [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

“…COE-SOFT polymerizes in approximately 15 min, but the setting time was extended for an additional one hour, accounting for a total polymerization time of 1 h and 15 min. The specimens ( Figure 2 c) were then subjected to 1000 thermal cycles (Huber 1100, SD Mechatronik GmbH, Germany) in a water bath (5–55 °C), a dwell time of 30 s and a transfer time of 15 s [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

“…The advancement of computer-aided design and manufacturing (CAD/CAM) technologies has fundamentally changed the approach to denture processing in recent years [ 19 , 20 , 21 ]. The dentures have been fabricated using CAD/CAM technology since the 1990s; nevertheless, due to the lack of scientific evidence, they are still regarded as a relatively new approach [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Soft Denture Liner Adhesion to Conventional and CAD/CAM Processed Poly(Methyl Methacrylate) Acrylic Denture Resins-An In-Vitro Study

et al. 2021

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This study aimed to evaluate the airborne-particle abrasion surface treatment effects on the tensile bond strength (TBS) between resilient denture liner and CAD/CAM or conventional heat polymerized poly (methyl methacrylate) (PMMA) acrylic denture resins. A total of 48 dumbbell-shaped specimens (70 mm in total length, and 12 mm and 7 mm in diameter at the thickest and thinnest section, respectively) were prepared from CAD/CAM and conventional acrylic resins. Before relining with denture liner, 12 specimens from each material were surface-treated by 110 µm Al2O3 airborne-particle abrasion, and the remaining specimens served as control (no treatment). Following relining, all the specimens were aged by thermal cycling (1000 cycles, 5–55 °C). The TBS of denture liner to acrylic denture resins was tested in a universal testing apparatus at a 5 mm/min crosshead speed. The debonded surfaces were visually examined for the failure modes. ANOVA and multiple comparisons posthoc analysis tests were applied to determine the significant difference in TBS between the study groups (α = 0.05). A significant difference in TBS was observed between the control and surface treated groups (p < 0.001) for both acrylic resins materials. However, there was no statistically significant difference in bond strength between the acrylic resins materials (p = 0.739). Surface treatment with airborne-particle abrasion demonstrated increased TBS of the soft denture liners to acrylic resins. The TBS of conventional and CAD/CAM acrylic resins to soft denture liners were not considerably different.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft Denture Liner Adhesion to Conventional and CAD/CAM Processed Poly(Methyl Methacrylate) Acrylic Denture Resins-An In-Vitro Study

et al. 2021

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“…UDMA shows higher degree of conversion and displays lower water sorption than Bis-GMA. Therefore, the mechanical properties of these materials are enhanced, they provided a decrease in internal defects [ 13 , 21 , 22 ]. Because assessment of the surface characteristics in order to obtain optimal surface treatments is essential, and due to the little information related to surface processing and conditioning of resin matrix ceramic materials previous glazing, the purpose of the study was to investigate the effect of different surface treatments on the surface morphology for reliable outcomes of finished surfaces.…”

Section: Introductionmentioning

confidence: 99%

Surface Characterisation of Dental Resin Composites Related to Conditioning and Finishing

2021

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Due to the little information related to surface processing and conditioning of resin matrix ceramic materials previous glazing, the main purpose of this in vitro study was to investigate the effect of different surface treatments on the surface morphology of different resin composite materials. Five types of resin composite CAD-CAM materials: a resin composite ceramic Vita Enamic (E) and four types of nanoparticle-filled resins, like Lava Ultimate (L), Cerasmart (C), Shofu HC (S), Hyramic (H) were taken into consideration. Specimens received the following surface treatment protocols: conventional polishing [p], polishing and glazing [pg], conditioning with CoJet [c], conditioning with CoJet and glazing [cg], sandblasting [s], sandblasting and glazing [sg], etching [e], etching and glazing [eg]. Surface roughness was analyzed for all samples and nanosurface topographic characterization was made by Atomic Force Microscopy. The highest roughness was registered for sandblasted surfaces [s], followed by tribochemical silica airborne particle abrasion [c], and etching [e]. A very strong correlated conditioning behavior of resin nanoceramic materials, like L, C and S samples was found. The microroughness decreased thus [s] > [c] > [e]. These are moderate correlated with H, and are moderate negative correlated to E, where e is more efficient. Three-dimensional images indicated visible grain boundaries after conditioning, for all materials. After polishing and glazing, surfaces became smoother. For all tested conditioning and finishing methods, surface roughness values were within clinically acceptable limits. Finishing by polishing was proved to be a good choice for all materials taken into consideration, polishing and glazing likewise, excepting Hyramic. For Enamic and Shofu HC sandblasting or tribochemical conditioning and glazing and for Hyramic polishing and glazing are not the best options, related to nanoroughness values. Referring to the nanosurface topography, for Enamic, Cerasmart and Hyramic, glazing would be the method of choice, associated with the adequate conditioning method for each material.

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The effect of aging on hardness of heat cured denture base resin modified with recycled acrylic resin

AL‐Jmmal,

Mohammed,

AL‐kateb

2024

Clinical & Exp Dental Res

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BackgroundThe second rule of the 4Rs concept (Reduce, Reuse, Recycle, and Recover) was applied in this study using recycled acrylic resin to improve the hardness and study the effect of aging on the hardness of heat cured denture base resins.MethodForty heat‐cured acrylic resin samples were prepared and divided into control and modified groups. The hardness was tested using a type D durometer hardness tester for evaluating the effect of the thermal aging process on the hardness in the control and modified groups. The samples were either subjected to thermal aging (the specimens thermo‐cycled 10 cycles per day between 55°C and 5°C with a 30‐s dwell time) or were not.ResultsThe mean difference in hardness between specimens with and without aging in the modified group increased with increasing concentrations of incorporated recycled acrylic resin. Independent samples t test revealed that the hardness values of modified groups with aging were significantly higher than in those without aging (p ≤ 0.05). ANOVA revealed that the modified group revealed a significant increase in hardness than that of the control group (p ≤ 0.05).ConclusionsRecycling and reuse of acrylic resins improved the hardness of denture base resins. The aging period significantly affected the hardness values of the control and modified groups.

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

Cited by 31 publications

References 41 publications

Soft Denture Liner Adhesion to Conventional and CAD/CAM Processed Poly(Methyl Methacrylate) Acrylic Denture Resins-An In-Vitro Study

Soft Denture Liner Adhesion to Conventional and CAD/CAM Processed Poly(Methyl Methacrylate) Acrylic Denture Resins-An In-Vitro Study

Surface Characterisation of Dental Resin Composites Related to Conditioning and Finishing

The effect of aging on hardness of heat cured denture base resin modified with recycled acrylic resin

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