Characterization of the mechanical properties of CAD/CAM polymers for interim fixed restorations

Perea-Lowery, Leila; Gibreel, Mona; Vallittu, Pekka K.; Lassila, Lippo

doi:10.4012/dmj.2019-042

Cited by 18 publications

(19 citation statements)

References 38 publications

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“…The surface roughness of a restoration alters under the influence of multiple factors, which include the fabrication technique, oral conditions, opposite dentition load, diet, material composition, and polishing techniques [12]. In the present study, the surface roughness was assessed based on the fabrication technique-CAD-CAM, 3D printing, and the conventional technique.…”

Section: Discussionmentioning

confidence: 99%

Influence of Conventional, CAD-CAM, and 3D Printing Fabrication Techniques on the Marginal Integrity and Surface Roughness and Wear of Interim Crowns

et al. 2021

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The aim is to assess the influence of fabrication techniques—conventional (CN), CAD-CAM (CC), and 3D printing (3D)—on the marginal fit, adaptation, surface roughness, and wear of interim restorations of crowns. Thirty interim crowns were fabricated using CN, CC, and 3D techniques. Sixty discs were fabricated to evaluate surface wear and surface roughness properties, with 10 disc samples in each group (n = 10). Internal adaptation and marginal integrity of interim crowns were analyzed with micro CT to detect microgaps at selected points. Average surface micro-roughness (Ra) was calculated in micrometers (μm) using an optical non-contact surface microscope under cyclic loading. Surface wear was evaluated by surface area measurements (mm3) using a micro CT. Analysis of variance (ANOVA) and Tukey’s post hoc comparison tests with Pearson correlation were performed for data analysis. The highest adaptation means were for CN (269.94 ± 64 μm), and the lowest mean value was observed for 3D (197.82 ± 11.72 μm) crowns. CN and CC specimens showed comparable adaptation (p > 0.05), which were significantly higher (p < 0.05) than 3D crowns. CN crowns showed significantly higher marginal misfit compared to 3D (p < 0.05) and CC (p < 0.05) crowns. The highest mean surface roughness was observed in the 3D crowns (5.61 ± 0.33 µm), whereas the lowest was found in CC crowns (3.28 ± 0.34 µm). Better restoration Ra was observed using the CC method followed by CN. CN had the highest wear (17.79 ± 2.78 mm3), and the lowest wear was observed in the 3D (10.81 ± 2.00 mm3) specimen. Low surface wear was observed using 3D printing, followed by CN and CC techniques. The printed specimen showed comparable outcomes to CAD-CAM restoration; however, they were better than CN restoration. A positive correlation between adaptation and surface roughness was observed, indicating an effect of the fabrication technique on material physical property.

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Section: Discussionmentioning

confidence: 99%

Influence of Conventional, CAD-CAM, and 3D Printing Fabrication Techniques on the Marginal Integrity and Surface Roughness and Wear of Interim Crowns

et al. 2021

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“…The final finishing of the prosthetic restoration affects the development of the microbial biofilm, as increased surface roughness creates a favorable environment for bacterial growth. As such, a prosthetic surface finish from proper manufacturing technique is important [25,27,51]. Most comparative studies have been performed on self-curing resins and resins that are used in digital technologies.…”

Section: Discussionmentioning

confidence: 99%

“…Comparing interim restorations that were fabricated by CAD/CAM with those that were conventionally made had several aspects that were taken into account: color stability, water sorption, wear resistance, surface hardness, fracture resistance, and microleakage [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

An Interdisciplinary Study Regarding the Characteristics of Dental Resins Used for Temporary Bridges

et al. 2022

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Background and Objectives: The surface condition of the materials that are used for temporary prostheses influences their microbial colonization, with a direct impact on the oral tissues. This study aims at a comparative analysis of three types of resins for temporary bridges using conventional and digital technologies. The attention was focused on the analysis of the surface characteristics and mechanical strength of these materials. Materials and Methods: The surface condition was assessed for three distinct materials both before and after polishing- heat-curing resin Superpont C + B (SpofaDental, Jicin, Czech Republic) used unconventional technology, Zotion dental milling polymethyl methacrylate (PMMA) block (Zotion, Chongqing, China) for provisional crowns/bridges used in digital subtractive technologies and Freeprint Temp (Detax GmbH & Co. KG, Ettlingen, Germany) resin for temporary crowns and bridges that are used in 3D printing technologies. The two-way ANOVA analysis indicated that polishing leads to a statistically significant increase in roughness coefficients for all the three resins that were tested (p < 0.001). While the highest roughness coefficients were displayed in the 3D cured sample, the largest decrease was reported by the milled sample Results: The results revealed that surface roughness was significantly influenced by both the type of resin that was used (p < 0.001) and the treatment that was induced by finishing and polishing (p < 0.001). Similar p-values were obtained for each of the three resins. Conclusions: The results demonstrated a significant optimization of the surfaces after finishing and polishing and statistically significant differences between the surface parameters and the mechanical properties of the samples. The low values of the roughness and the acceptable values of the mechanical resistance for the conventional samples indicate these materials for the long-term temporary bridge’s realization, allowing the correct restoration of the functions and the rehabilitation at the oral level.

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“…Many manufacturers offer high density polymers with high crosslinked polymethyl methacrylate (PMMA) resin content for CAD-CAM systems [7,8] . These cross-linked materials have different mechanical properties depending on their chemical composition [9] . On the other hand, surface hardness is directly related to the quality of polymerization and cross-link density [4,9] .…”

Section: Introductionmentioning

confidence: 99%

“…These cross-linked materials have different mechanical properties depending on their chemical composition [9] . On the other hand, surface hardness is directly related to the quality of polymerization and cross-link density [4,9] . The blocks and discs used for these systems have a stronger and more homogeneous structure as they were previously polymerized.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermo-cycling on microhardness of CAD-CAM provisional materials

Başak¹,

Özmen²,

Sağsöz³

et al. 2020

Int. J. Appl. Dent. Sci.

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Temporary restorations are an important stage of fixed prosthetic treatment in the period until the final restoration is made and the most appropriate provisional material with CAD-CAM technology used today should be researched. The aim of this study was to investigate the effect of thermo-cycling on micro hardness of CAD-CAM Provisional materials. Materials and methods: Three types of provisional restorative materials produced for CAD-CAM systems were examined: Vita CAD Temp (Vita Zahnfabrik, Germany), Telio CAD (Ivoclar Vivadent, Liechtenstein) and Ceramill Temp (Amann Girrbach, Austria). A total of thirty disc specimens with 2 mm thick and 10 mm diameter were produced (n=10). Vickers hardness was measured under a load of 10g for 10s. All specimen groups were subjected to 5000 thermo cycles and hardness measurements repeated. One-way ANOVA and post hoc Tukey's test were used for statistical analysis. Results: Hardness values (HV) of CAD-CAM provisional materials decreased after thermo-cycling, however, it was not statistically significant (p>0.05). Conclusion:Thermo-cycling affects the hardness of CAD-CAM provisional materials tested. Thermocycling was directly related to the reduction of microhardness values for the CAD Temp and Ceramill Temp. These findings may support clinicians to advice patients who have to use temporary restorations for a long time to avoid thermal changes in the mouth.

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Characterization of the mechanical properties of CAD/CAM polymers for interim fixed restorations

Cited by 18 publications

References 38 publications

Influence of Conventional, CAD-CAM, and 3D Printing Fabrication Techniques on the Marginal Integrity and Surface Roughness and Wear of Interim Crowns

Influence of Conventional, CAD-CAM, and 3D Printing Fabrication Techniques on the Marginal Integrity and Surface Roughness and Wear of Interim Crowns

An Interdisciplinary Study Regarding the Characteristics of Dental Resins Used for Temporary Bridges

Effect of thermo-cycling on microhardness of CAD-CAM provisional materials

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