Effect of toothbrush/dentifrice abrasion on weight variation, surface roughness, surface morphology and hardness of conventional and CAD/CAM denture base materials

Chang, Y. Austin; Lee, Chen‐Yi; Hsu, Ming-Sung; Du, Je‐Kang; Chen, Ker-Kong; Wu, Ju‐Hui

doi:10.4012/dmj.2019-226

Cited by 25 publications

(28 citation statements)

References 31 publications

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“…Nevertheless, the exact brushing cycles vary for some patients who practice cleaning their dentures repeatedly. 50 Secondly, it is impractical to simulate the period that the beverage is in contact with artificial dentures inside the mouth before swallowing. 51 Finally, there was no substantial comparison of the present findings with previous data due to the limited number of studies concerning the properties of 3D-printed resins, such as watersorption, surface roughness, hardness before their inclusion in routine clinical practice.…”

Section: Discussionmentioning

confidence: 99%

Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

et al. 2021

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PURPOSE This in-vitro study evaluated and compared the color stability of 3D-printed and conventional heat-polymerized acrylic resins following aging, mechanical brushing, and immersion in staining medium. MATERIALS AND METHODS Forty disc-shaped specimens (10 mm in diameter and 3 mm thick) were prepared from two 3D-printed [DentaBASE (DB) and Denture 3D+ (D3D)] and one conventional polymethylmethacrylate (PMMA) denture materials. The specimens were thermo-cycled, subjected to mechanical brushing, and were immersed in either coffee, lemon juice, coke, or artificial saliva (AS) to simulate one and two years of oral use. Color measurements of the specimens were recorded by a spectrophotometer at baseline (T0), and after one (T1) and two years (T2) of simulation. The color changes (∆E) were determined and also quantified according to the National Bureau of Standards (NBS) units. Descriptive statistics, followed by factorial ANOVA and Bonferroni post-hoc test (α=.05), were applied for data analysis. RESULTS The independent factors, namely material, staining medium, and immersion time, and interaction among these factors significantly influenced ∆E ( P <.009). Irrespective of the materials, treatments, and time, the highest and the lowest mean ∆Es were observed for PMMA in lemon juice (4.58 ± 1.30) and DB in AS (0.41 ± 0.18), respectively. Regarding the material type, PMMA demonstrated the highest mean ∆E (2.31 ± 1.37), followed by D3D (1.67 ± 0.66), and DB (0.85 ± 0.52), and the difference in ∆E between the materials were statistically significant ( P <.001). All the specimens demonstrated a decreased color changes at T2 compared to T1, and this difference in mean ∆E was statistically significant ( P <.001). CONCLUSION The color changes of 3D-printed denture resins were low compared to conventional heat polymerized PMMA. All the tested materials, irrespective of the staining medium used, demonstrated a significant decrease in ∆E values over time.

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Section: Discussionmentioning

confidence: 99%

Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

et al. 2021

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“…Denture cleaning is essential for the longevity of a complete denture [6], regardless of the manufacturing technique being additive, subtractive, or conventional [7], and brushing is a straightforward and affordable cleaning method [8]. However, www.mrs.org/jmr © The Author(s) 2022 2…”

Section: Introductionmentioning

confidence: 99%

Surface roughness and stainability of new-generation denture base materials after brushing and coffee thermocycling

Çakmak

Dönmez

Paula

et al. 2022

Journal of Materials Research

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Disk-shaped specimens were prepared from additively (NX and DT), subtractively (MZ), and conventionally manufactured denture base resins (CV). Surface roughness and color coordinates were measured after polishing, simulated brushing, and coffee thermocycling, while surface roughness was also measured before polishing. Polishing reduced the surface roughness of all materials. Brushing and coffee thermocycling increased the surface roughness of only DT. CV had the highest susceptibility to consecutive brushing and coffee thermocycling as it had the highest surface roughness, which was above the clinically acceptable threshold. All materials had similar stainability; only MZ had perceptible color change after brushing. Even though stainability of tested denture base resins was similar, additively or subtractively manufactured computer-aided design and computer-aided manufacturing (CAD-CAM) resins had smoother surfaces after brushing and coffee thermocycling, regardless of the material. Therefore, complete dentures made out of these CAD-CAM resins may have favorable surface properties in the long term. Graphical abstract

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“…A further limitation of this study is the absence of toothpaste as the abrasiveness of the paste influence the brushing abrasion [36]. However, the of toothpaste for the cleaning of denture bases is discussed controversially for its use may roughen the resin surfaces [37]. Tap water instead of distilled or deionized water was used in this study to simulate the real-life conditions as required, e.g., for denture care training.…”

Section: Discussionmentioning

confidence: 99%

Novel Artificial Biofilm Equivalent for Denture Surfaces: A Pilot Study

Kunze

Boening

Meißner

et al. 2022

International Journal of Polymer Science

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The microbial population of the dental biofilm is embedded in an extracellular matrix that contains organic polymers such as polysaccharides. The extracellular matrix promotes biofilm adhesion on surfaces of dental prostheses and acts as a protective barrier. Thus, a breakdown of the extracellular matrix is crucial for an effective mechanical biofilm removal by brushing. The purpose of this study was to develop an artificial biofilm equivalent (ABE) that is able to mimic the mechanical properties of a natural biofilm concerning abrasion resistance. It contains the two polysaccharides chitosan (ChS) and methylcellulose (MC). Polymethylmethacrylate (PMMA) cylinders ( n = 80 ) were manufactured and coated with the ABE with varying concentration ratios of ChS and MC. Eight test series ( n = 8 each) with different mixing ratios of ChS/MC were tested for their abrasion resistance to brushing in a toothbrush simulator. For the ABE, a total of 2.0 g of polysaccharides were added to 100 ml of 2% acetic acid: 0.3–1.0 g ChS and 1.0–1.7 MC, respectively. Furthermore, two control series ( n = 8 each) with 2.0 g of ChS only or 2.0 g of MC only were performed. Coated specimens were subjected to an increasing number of brushing strokes from 5 to 45 via abrasion test. The specimens were photographed, and a computerized planimetric method (CPM) was used to calculate the percentage of remaining ABE on the brushed areas of the PMMA cylinders. The abrasion resistance of the ABE to brushing decreased with an increasing ratio of MC in the mixture. The abrasion resistance of the ABE can be adjusted by changing the ratio of ChS and MC.

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Effect of toothbrush/dentifrice abrasion on weight variation, surface roughness, surface morphology and hardness of conventional and CAD/CAM denture base materials

Cited by 25 publications

References 31 publications

Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

Surface roughness and stainability of new-generation denture base materials after brushing and coffee thermocycling

Novel Artificial Biofilm Equivalent for Denture Surfaces: A Pilot Study

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