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Bogna Stawarczyk - One of the best experts on this subject based on the ideXlab platform.
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Influence of cleaning methods after 3D printing on two-body wear and Fracture Load of resin-based temporary crown and bridge material
Clinical Oral Investigations, 2021Co-Authors: Johannes Mayer, Bogna Stawarczyk, Daniel Edelhoff, Konstantin Vogt, Reinhard Hickel, Marcel ReymusAbstract:Objectives To investigate the impact of different cleaning methods on the Fracture Load and two-body wear of additively manufactured three-unit fixed dental prostheses (FDP) for long-term temporary use, compared to the respective outcomes of milled provisional PMMA FDPs. Materials and methods Shape congruent three-unit FDPs were 3D printed using three different resin-based materials [FPT, GCT, NMF] or milled [TEL] ( N = 48, n = 16 per group). After printing, the FDPs were cleaned using: Isopropanol (ISO), Yellow Magic 7 (YEL), or centrifugal force (CEN). Chewing simulation was carried out with a vertical Load of 50 N (480,000 × 5 °C/55 °C). Two-body wear and Fracture Load were measured. Data were analyzed using global univariate ANOVA with partial eta squared, Kruskal-Wallis H , Mann-Whitney U , and Spearman’s rho test ( p < 0.05). Results TEL showed less wear resistance than FPT ( p = 0.001) for all cleaning methods tested. Concerning vertical material loss, NMF and GCT were in the same range of value ( p = 0.419–0.997), except within FDPs cleaned in ISO ( p = 0.021). FPT showed no impact of cleaning method on wear resistance ( p = 0.219–0.692). TEL ( p < 0.001) showed the highest and FPT ( p < 0.001) the lowest Fracture Load. Regarding the cleaning methods, specimens treated with ISO showed lower Fracture Load than specimens cleaned with CEN ( p = 0.044) or YEL ( p = 0.036). Conclusions The material selection and the cleaning method can have an impact on two-body wear and Fracture Load results. Clinical relevance Printed restorations showed superior two-body wear resistance compared to milled FDPs but lower Fracture Load values. Regarding cleaning methods, ISO showed a negative effect on Fracture Load compared to the other methods tested.
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Fracture Load of 3d printed peek inlays compared with milled ones direct resin composite fillings and sound teeth
Clinical Oral Investigations, 2020Co-Authors: Alexander Prechtel, Bogna Stawarczyk, Daniel Edelhoff, Reinhard Hickel, Marcel ReymusAbstract:The objective of this in vitro study was to investigate Fracture Load, Fracture types, and impact of chewing simulation of human molars restored with 3D printed indirect polyetheretherketone (PEEK) inlays and compare these with milled indirect PEEK inlays, direct resin composite fillings, and sound teeth. A total of 112 molars with form congruent class I cavities were restored with (n = 16/group) 3D printed indirect PEEK inlays via fused layer manufacturing (FLM): (1) Essentium PEEK (ESS), (2) KetaSpire PEEK MS-NT1 (KET), (3) VESTAKEEP i4 G (VES), (4) VICTREX PEEK 450G (VIC), (5) milled indirect PEEK inlays JUVORA Dental Disc 2 (JUV), and (6) direct resin composite fillings out of Tetric EvoCeram (TET). Sound teeth (7) acted as positive control group. Half of the specimens of each group (n = 8) were treated in a chewing simulator combined with thermal cycling (1.2 million × 50 N; 12,000 × 5 °C/55 °C). Fracture Load and Fracture types of all molars were determined. Statistical analyses using Kolmogorov-Smirnov test and two-way ANOVA with partial eta squared (ηp2) followed by Scheffe post hoc test, chi square test and Weibull modulus m with 95% confidence interval were computed (p < 0.05). ESS and TET demonstrated the lowest Fracture Load with a minimum of 956 N, whereas sound molars showed the highest values of up to 2981 N. Chewing simulation indicated no impact (p = 0.132). With regard to Weibull modulus, KET presented a lower value after chewing simulation than JUV, whereas TET had the highest value without chewing simulation. All indirect restorations revealed a tooth Fracture (75–100%), direct resin composite fillings showed a restoration Fracture (87.5%), and 50% of the sound teeth Fractured completely or had cusp Fractures. All 3D printed and milled indirect PEEK inlays as well as the direct resin composite fillings presented a higher Fracture Load than the expected physiological and maximum chewing forces. 3D printing of inlays out of PEEK via FLM provided promising results in mechanics, but improvements in terms of precision and esthetics will be required to be practicable in vivo to represent an alternative dental material.
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Fracture Load of 3D printed PEEK inlays compared with milled ones, direct resin composite fillings, and sound teeth
Clinical Oral Investigations, 2020Co-Authors: Alexander Prechtel, Bogna Stawarczyk, Daniel Edelhoff, Reinhard Hickel, Marcel ReymusAbstract:Objective The objective of this in vitro study was to investigate Fracture Load, Fracture types, and impact of chewing simulation of human molars restored with 3D printed indirect polyetheretherketone (PEEK) inlays and compare these with milled indirect PEEK inlays, direct resin composite fillings, and sound teeth. Materials and methods A total of 112 molars with form congruent class I cavities were restored with ( n = 16/group) 3D printed indirect PEEK inlays via fused layer manufacturing (FLM): (1) Essentium PEEK (ESS), (2) KetaSpire PEEK MS-NT1 (KET), (3) VESTAKEEP i4 G (VES), (4) VICTREX PEEK 450G (VIC), (5) milled indirect PEEK inlays JUVORA Dental Disc 2 (JUV), and (6) direct resin composite fillings out of Tetric EvoCeram (TET). Sound teeth (7) acted as positive control group. Half of the specimens of each group ( n = 8) were treated in a chewing simulator combined with thermal cycling (1.2 million × 50 N; 12,000 × 5 °C/55 °C). Fracture Load and Fracture types of all molars were determined. Statistical analyses using Kolmogorov-Smirnov test and two-way ANOVA with partial eta squared (η_p^2) followed by Scheffé post hoc test, chi square test and Weibull modulus m with 95% confidence interval were computed ( p
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Fracture Load and chewing simulation of zirconia and stainless‐steel crowns for primary molars
European journal of oral sciences, 2019Co-Authors: Stefan Kist, Bogna Stawarczyk, Reinhard Hickel, Maximilian Kollmuss, Karin Christine HuthAbstract:Aesthetic alternatives to stainless-steel crowns for restoring primary molars attain growing interest. We studied the mechanical properties of prefabricated zirconia crowns and conventional crowns. Three brands of prefabricated zirconia crowns were compared with computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crowns, preveneered stainless-steel crowns, and conventional stainless-steel crowns regarding: (i) Fracture Load under each of three conditions [no pretreatment, artificial aging in saliva for 12 wk, and after chewing simulation/thermocycling (1.68 × 106 cycles/5-55°C)]; and (ii) survival rate during chewing simulation, considering decementation, Fracture, chipping, fatigue cracks, and occlusal holes. Without pretreatment, the prefabricated zirconia crowns showed mean Fracture Load values between 893 N and 1,582 N, while the corresponding values for CAD/CAM zirconia crowns and preveneered stainless-steel crowns were 2,444 N and 6,251 N. Preveneered stainless-steel crowns showed significantly lower Fracture Loads after artificial aging (5,348 N after saliva aging; 3,778 N after chewing simulation) than without artificial aging, whereas the Fracture Load of zirconia crowns was not influenced negatively. The survival rate of the different groups of zirconia crowns and preveneered stainless-steel crowns during chewing simulation was 100%, but only 41.7% for the stainless-steel crowns. These in-vitro data suggest that prefabricated zirconia crowns are aesthetically and durable alternatives to stainless-steel crowns for primary molars.
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Fracture Load and failure types of different veneered polyetheretherketone fixed dental prostheses.
Clinical oral investigations, 2016Co-Authors: Simon Taufall, Marlis Eichberger, Patrick R. Schmidlin, Bogna StawarczykAbstract:Objective The aim of this study is to investigate the Fracture Load of different veneered PEEK 3-unit fixed dental prosthesis (FDPs) after different aging regimens.
Christoph H. F. Hämmerle - One of the best experts on this subject based on the ideXlab platform.
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Impact of air‐abrasion on Fracture Load and failure type of veneered anterior Y‐TZP crowns before and after chewing simulation
Journal of biomedical materials research. Part B Applied biomaterials, 2012Co-Authors: Bogna Stawarczyk, Mutlu Özcan, Malgorzata Roos, Albert Trottmann, Lubica Hallmann, Christoph H. F. HämmerleAbstract:The purpose of this study was to determine the Fracture Load and failure types of veneered zirconia crowns that were air-abraded on either the veneering or cementation surface. Fracture Loads were determined before and after chewing simulation. Standardized Y-TZP frameworks (n = 360) for canines were fabricated and divided into one control group (n = 72) and 12 test groups (n = 24). The test groups were air-abraded using alumina powder (10 s, 2 bar, distance: 10 mm) with particle size of 50 μm resp. 110 μm and veneered with one of the veneering ceramics: Triceram, Zirox, or VITA VM9. The crowns were cemented on their corresponding CoCr abutment. The initial Fracture Load was measured in one half of each group (n = 12), and the other half (n = 12) was subjected to chewing cycling. The data were analyzed using three-way and one-way ANOVA, a post-hoc Scheffe test, two sample Student's t-test, and Weibull statistics (p < 0.05). Thus, nonaged, air-abraded groups of two veneering ceramics (Triceram, VITA VM9) showed higher mean Fracture Load compared to control groups. After chewing simulation, air-abraded groups showed lower mean Fracture Load compared to control groups. Aging decreased the Weibull modulus of all tested groups, and air-abraded groups showed lower Weibull moduli compared to control groups.
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Impact of air-abrasion on Fracture Load and failure type of veneered anterior Y-TZP crowns before and after chewing simulation
Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2012Co-Authors: Bogna Stawarczyk, Mutlu Özcan, Malgorzata Roos, Albert Trottmann, Lubica Hallmann, Christoph H. F. HämmerleAbstract:The purpose of this study was to determine the Fracture Load and failure types of veneered zirconia crowns that were air-abraded on either the veneering or cementation surface. Fracture Loads were determined before and after chewing simulation. Standardized Y-TZP frameworks (n = 360) for canines were fabricated and divided into one control group (n = 72) and 12 test groups (n = 24). The test groups were air-abraded using alumina powder (10 s, 2 bar, distance: 10 mm) with particle size of 50 μm resp. 110 μm and veneered with one of the veneering ceramics: Triceram, Zirox, or VITA VM9. The crowns were cemented on their corresponding CoCr abutment. The initial Fracture Load was measured in one half of each group (n = 12), and the other half (n = 12) was subjected to chewing cycling. The data were analyzed using three-way and one-way ANOVA, a post-hoc Scheffé test, two sample Student's t-test, and Weibull statistics (p < 0.05). Thus, nonaged, air-abraded groups of two veneering ceramics (Triceram, VITA VM9) showed higher mean Fracture Load compared to control groups. After chewing simulation, air-abraded groups showed lower mean Fracture Load compared to control groups. Aging decreased the Weibull modulus of all tested groups, and air-abraded groups showed lower Weibull moduli compared to control groups
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the Fracture Load and failure types of veneered anterior zirconia crowns an analysis of normal and weibull distribution of complete and censored data
Dental Materials, 2012Co-Authors: Bogna Stawarczyk, Mutlu Özcan, Christoph H. F. Hämmerle, Malgorzata RoosAbstract:OBJECTIVES: The aim of this study was to compare the Fracture Load of veneered anterior zirconia crowns using normal and Weibull distribution of complete and censored data. METHODS: Standardized zirconia frameworks for maxillary canines were milled using a CAD/CAM system and randomly divided into 3 groups (N=90, n=30 per group). They were veneered with three veneering ceramics, namely GC Initial ZR, Vita VM9, IPS e.max Ceram using layering technique. The crowns were cemented with glass ionomer cement on metal abutments. The specimens were then Loaded to Fracture (1mm/min) in a Universal Testing Machine. The data were analyzed using classical method (normal data distribution (μ, σ); Levene test and one-way ANOVA) and according to the Weibull statistics (s, m). In addition, Fracture Load results were analyzed depending on complete and censored failure types (only chipping vs. total Fracture together with chipping). RESULTS: When computed with complete data, significantly higher mean Fracture Loads (N) were observed for GC Initial ZR (μ=978, σ=157; s=1043, m=7.2) and VITA VM9 (μ=1074, σ=179; s=1139; m=7.8) than that of IPS e.max Ceram (μ=798, σ=174; s=859, m=5.8) (p<0.05) by classical and Weibull statistics, respectively. When the data were censored for only total Fracture, IPS e.max Ceram presented the lowest Fracture Load for chipping with both classical distribution (μ=790, σ=160) and Weibull statistics (s=836, m=6.5). When total Fracture with chipping (classical distribution) was considered as failure, IPS e.max Ceram did not show significant Fracture Load for total Fracture (μ=1054, σ=110) compared to other groups (GC Initial ZR: μ=1039, σ=152, VITA VM9: μ=1170, σ=166). According to Weibull distributed data, VITA VM9 showed significantly higher Fracture Load (s=1228, m=9.4) than those of other groups. SIGNIFICANCE: Both classical distribution and Weibull statistics for complete data yielded similar outcomes. Censored data analysis of all ceramic systems based on failure types is essential and brings additional information regarding the susceptibility to chipping or total Fracture.
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Fracture Load and failure analysis of zirconia single crowns veneered with pressed and layered ceramics after chewing simulation
Dental materials journal, 2011Co-Authors: Bogna Stawarczyk, Mutlu Özcan, Malgorzata Roos, Albert Trottmann, Christoph H. F. HämmerleAbstract:This study determined the Fracture Load of zirconia crowns veneered with four overpressed and four layered ceramics after chewing simulation. The veneered zirconia crowns were cemented and subjected to chewing cycling. Subsequently, the specimens were Loaded at an angle of 45° in a Universal Testing Machine to determine the Fracture Load. One-way ANOVA, followed by a post-hoc Scheffe test, t-test and Weibull statistic were performed. Overpressed crowns showed significantly lower Fracture Load (543–577 N) compared to layered ones (805–1067 N). No statistical difference was found between the Fracture Loads within the overpressed group. Within the layered groups, LV (1067 N) presented significantly higher results compared to LC (805 N). The mean values of all other groups were not significantly different. Single zirconia crowns veneered with overpressed ceramics exhibited lower Fracture Load than those of the layered ones after chewing simulation.
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impact of thermal properties of veneering ceramics on the Fracture Load of layered ce tzp a nanocomposite frameworks
Dental Materials, 2009Co-Authors: Jens Fischer, Bogna Stawarczyk, Albert Trottmann, Christoph H. F. HämmerleAbstract:Abstract Objectives The aim of this in vitro study was to assess the influence of thermal properties of veneering ceramics on the Fracture Load of layered ceria stabilized zirconia/alumina nanocomposite (Ce-TZP/A) single crowns. Methods Ce-TZP/A single crown frameworks (nanoZr) were veneered with 5 different veneering ceramics for zirconia (Cerabien ZR, IPS e.max, Triceram, Vintage ZR, VM9). In addition, veneering ceramics for alumina (Allux) and for the metal–ceramic technique (Reflex) were included in order to cover a wide range of coefficients of thermal expansion. Fracture Load of the crowns was assessed in a shear test ( n = 10). Glass transition temperatures ( T g ) of the ceramics as well as the coefficients of thermal expansion of the ceramics ( α veneer ) and Ce-TZP/A ( α core ) between 25 and 500 °C were determined ( n = 6). Results Fracture Load ranged from 574.0 ± 97.1 N (IPS e.max) to 1009.6 ± 150.0 N (VM9). Δ α = α core − α veneer and Δ T = T g − 25 °C (Δ T in K) were calculated. The Fracture Load was strongly correlated to Δ α Δ T with a maximum at Δ α Δ T ≈ 580 × 10 −6 . Significance The overall Fracture Load of veneered Ce-TZP/A crowns is correlated to the thermal properties of the respective veneering ceramic.
Hideo Matsumura - One of the best experts on this subject based on the ideXlab platform.
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An in vitro evaluation of Fracture Load of implant-supported zirconia-based prostheses fabricated with different veneer materials.
Clinical oral implants research, 2018Co-Authors: Hiroki Takata, Futoshi Komine, Junichi Honda, Markus B. Blatz, Hideo MatsumuraAbstract:Objectives The purpose of this in vitro study was to evaluate Fracture Loads of implant-supported zirconia-based prostheses fabricated with different veneer materials (resin-based material and lithium disilicate ceramics). Material and methods Forty-four zirconia-based molar prostheses were fabricated on dental implants and divided into four groups (n = 11): zirconia-based prostheses veneered with feldspathic porcelain (ZVF), zirconia-based prostheses bonded with the lithium disilicate glass-ceramic veneer (ZBD), zirconia-based prostheses veneered with indirect composite resin (ZVC), and zirconia-based prostheses bonded with composite materials fabricated from a CAD/CAM resin block (ZBC). The zirconia-based prostheses and abutments were adhesively bonded with a dual-polymerized resin-based luting material. Fracture Load was determined using compression Load to the prostheses with a universal testing machine. The data were analyzed with one-way analysis of variance (ANOVA) and Tukey's HSD test (α = .05). Results The mean Fracture Load was significantly higher in the ZBC group (3.95 kN) than in the ZVC group (3.28 kN). No significant difference in Fracture Load was found among the ZVF (3.52 kN), ZBD (3.48 kN), and ZVC groups. Conclusions The adhesively bonded veneering technique enhances Fracture resistance of implant-supported zirconia-based prostheses fabricated with a resin-based material. All implant-supported zirconia-based restorations tested should resist physiologic masticatory forces in the oral environment.
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Effect of framework design on Fracture Load after thermal cycling and mechanical Loading of implant-supported zirconia-based prostheses
Dental materials journal, 2017Co-Authors: Futoshi Komine, Shingo Kamio, Hiroki Takata, Shogo Yagawa, Serina Taguchi, Kohei Taguchi, Akiko Hashiguchi, Hideo MatsumuraAbstract:This study evaluated the effect of zirconia framework design on Fracture Load of implant-supported zirconia-based prostheses after thermal cycling and mechanical Loading. Three different zirconia framework designs were investigated: uniform-thickness (UNI), anatomic (ANA), and supported anatomic (SUP) designs. Each framework was layered with feldspathic porcelain (ZAC group) or indirect composite material (ZIC group). The specimens then underwent Fracture Load testing after thermal cycling and cyclic Loading. In the ZAC group, mean Fracture Load was significantly lower for UNI design specimens than for the other framework designs. In the ZIC group, there was no significant difference in mean Fracture Load between ANA design specimens and either UNI or SUP design specimens. To improve Fracture resistance of implant-supported zirconia-based prostheses after artificial aging, uniformly thick layering material and appropriate lingual support with zirconia frameworks should be provided.
Hiroki Takata - One of the best experts on this subject based on the ideXlab platform.
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An in vitro evaluation of Fracture Load of implant-supported zirconia-based prostheses fabricated with different veneer materials.
Clinical oral implants research, 2018Co-Authors: Hiroki Takata, Futoshi Komine, Junichi Honda, Markus B. Blatz, Hideo MatsumuraAbstract:Objectives The purpose of this in vitro study was to evaluate Fracture Loads of implant-supported zirconia-based prostheses fabricated with different veneer materials (resin-based material and lithium disilicate ceramics). Material and methods Forty-four zirconia-based molar prostheses were fabricated on dental implants and divided into four groups (n = 11): zirconia-based prostheses veneered with feldspathic porcelain (ZVF), zirconia-based prostheses bonded with the lithium disilicate glass-ceramic veneer (ZBD), zirconia-based prostheses veneered with indirect composite resin (ZVC), and zirconia-based prostheses bonded with composite materials fabricated from a CAD/CAM resin block (ZBC). The zirconia-based prostheses and abutments were adhesively bonded with a dual-polymerized resin-based luting material. Fracture Load was determined using compression Load to the prostheses with a universal testing machine. The data were analyzed with one-way analysis of variance (ANOVA) and Tukey's HSD test (α = .05). Results The mean Fracture Load was significantly higher in the ZBC group (3.95 kN) than in the ZVC group (3.28 kN). No significant difference in Fracture Load was found among the ZVF (3.52 kN), ZBD (3.48 kN), and ZVC groups. Conclusions The adhesively bonded veneering technique enhances Fracture resistance of implant-supported zirconia-based prostheses fabricated with a resin-based material. All implant-supported zirconia-based restorations tested should resist physiologic masticatory forces in the oral environment.
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Effect of framework design on Fracture Load after thermal cycling and mechanical Loading of implant-supported zirconia-based prostheses
Dental materials journal, 2017Co-Authors: Futoshi Komine, Shingo Kamio, Hiroki Takata, Shogo Yagawa, Serina Taguchi, Kohei Taguchi, Akiko Hashiguchi, Hideo MatsumuraAbstract:This study evaluated the effect of zirconia framework design on Fracture Load of implant-supported zirconia-based prostheses after thermal cycling and mechanical Loading. Three different zirconia framework designs were investigated: uniform-thickness (UNI), anatomic (ANA), and supported anatomic (SUP) designs. Each framework was layered with feldspathic porcelain (ZAC group) or indirect composite material (ZIC group). The specimens then underwent Fracture Load testing after thermal cycling and cyclic Loading. In the ZAC group, mean Fracture Load was significantly lower for UNI design specimens than for the other framework designs. In the ZIC group, there was no significant difference in mean Fracture Load between ANA design specimens and either UNI or SUP design specimens. To improve Fracture resistance of implant-supported zirconia-based prostheses after artificial aging, uniformly thick layering material and appropriate lingual support with zirconia frameworks should be provided.
Albert Mehl - One of the best experts on this subject based on the ideXlab platform.
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Fracture Load of CAD/CAM Feldspathic Crowns Influenced by Abutment Material.
Materials (Basel Switzerland), 2020Co-Authors: Mladen Bencun, Andreas Ender, Daniel B. Wiedemeier, Albert MehlAbstract:In vitro studies investigating the mechanical properties of dental reconstructions use various materials to replicate prepared teeth. However, no uniform recommendation exists as to which material is most suitable for standardized testing. The purpose of this study was to identify a material that resembles human dentin in Fracture Load tests. Sixteen human teeth were scanned with an intraoral scanner to obtain copies of the original crown morphology and were then prepared for crowns. Replica dies of the prepared teeth including the root morphology were fabricated with a Computer-aided design and computer-aided manufacturing (CAD/CAM) system and divided into four groups: (A) reinforced composite (RC); (B) human dentin (HD); (C) polymethyl methacrylate (PM); and (D) hybrid ceramic (HC). Sixty-four feldspar ceramic crowns were designed with the biocopy mode, fabricated with a CAD/CAM system, luted on the dies, and then with the roots embedded in polymethyl methacrylate. Care was taken to position all specimens of the same morphology identically. Thermo-mechanical Load cycling was performed in a chewing simulator followed by fractural Loading of the crowns. A mixed effect linear model was fitted to the data, and pairwise contrasts were estimated on the marginal means and corrected for multiple testing according to Tukey (α = 0.05). The means for Fracture Load (N) were 2435 N (95% CI (2162, 2709)) for hybrid ceramic, 1838 N (95% CI (1565, 2112)) for reinforced composite, 1670 N (95% CI (1396, 1943)) for human tooth and 1142 N (95% CI (868, 1415)) for polymethyl methacrylate abutment materials. Post-hoc pairwise contrasts revealed a statistically significant (p < 0.05) difference among all groups except for reinforced composite and human dentin (p = 0.76). The results indicate that the mechanical properties of abutment dies play a significant role for a possible substitution of natural teeth in in vitro studies.
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Fracture Load of three unit full contour fixed dental prostheses fabricated with subtractive and additive cad cam technology
Clinical Oral Investigations, 2020Co-Authors: Moritz Zimmermann, Andreas Ender, Thomas Attin, Albert MehlAbstract:Objectives The aim of this study was to test the Fracture Load of ceramic and composite three-unit full-contour fixed dental prostheses (FDPs) fabricated with additive and subtractive computer-aided design (CAD)/computer-aided manufacturing (CAM) technology.
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Fracture Load of cad cam fabricated and 3d printed composite crowns as a function of material thickness
Clinical Oral Investigations, 2019Co-Authors: Moritz Zimmermann, Mutlu Özcan, Andreas Ender, Gustav Hans Egli, Albert MehlAbstract:Objectives Indirect CAD/CAM restorations can be fabricated using both subtractive and additive CAD/CAM technology. This study investigated the Fracture Load of crowns fabricated from three particle-filled composite CAD/CAM materials and one 3D-printed composite material.
