Comparison of CAD-CAM and traditional chairside processing of 4-unit interim prostheses with and without cantilevers: Mechanics, fracture behavior, and finite element analysis

Coelho, Carolina; Calamote, Catarina; Pinto, António Correia; Esteves, José Luís; Ramos, António; Escuín, Tomás; Souza, Júlio C. M.

doi:10.1016/j.prosdent.2020.11.007

Cited by 9 publications

(10 citation statements)

References 28 publications

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“…This variation between the studied materials might be related to the value of elastic modulus since the decrease in elastic modulus leads to reduced resistance to fracture [ 47 ]. This finding agreed with the results of previous studies that tested the flexural strength of 3- or 4-unit prostheses [ 11 , 12 , 14 , 19 , 50 ]. However, Henderson et al [ 25 ] reported that the fracture of the IFDP was restricted to the distal connector extending to the pontic cusp tip.…”

Section: Discussionsupporting

confidence: 92%

“…In agreement with previous studies, the flexural strength and force at fracture of milled IFDPs was higher than the conventional group [ 1 , 6 , 12 , 13 , 21 ]. The tested materials in the present study were subjected to thermal cycling.…”

Section: Discussionsupporting

confidence: 92%

“…The dimensions of all fabricated specimens from the four different materials were evaluated by a digital caliper (Digital ABS AOS Caliper; Mitutoyo Corp, Tokyo, Japan) according to the designed dimensions. According to previous articles, the IFDPs were not fixed with dental cements to avoid any additional variables that might affect the findings, since the use of dental cements allows even distribution of the applied force on IFDPs and increases their resistance to fracture [ 12 , 45 , 46 , 47 ]. The IFDPs were placed in distilled water at a temperature of 37 °C for 24 h [ 39 ].…”

Section: Methodsmentioning

confidence: 99%

“…Auto-polymerized polymethyl methacrylate (PMMA) is the most common material used in construction of IFDPs [ 10 , 11 ]. It is a readily available, inexpensive, and easy to use material [ 12 , 13 ]. Nevertheless, it requires laboratory and chairside adjustments [ 6 ] in addition to the manual mixing of the powder and monomer that results in stress concentrations and entrapment of air bubbles that make PMMA more prone to water sorption and mechanical failure [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Manufacturing of dental prostheses using CAD/CAM technology could be accomplished by subtractive method (milling), or additive method (three-dimensional (3D) printing) [ 8 , 18 , 19 ]. Milled resin is currently used in the fabrication of IFDPs because it has shown higher strength and durability than self-cured PMMA before and after thermomechanical aging [ 6 , 12 , 20 ]. However, the high expense of this technology might limit its use [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Influence of CAD/CAM Milling and 3D-Printing Fabrication Methods on the Mechanical Properties of 3-Unit Interim Fixed Dental Prosthesis after Thermo-Mechanical Aging Process

et al. 2022

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This study assessed the influence of CAD/CAM milling and 3D-printing fabrication methods on mechanical properties of 3-unit interim fixed dental prosthesis (IFDPs) after thermo-mechanical aging. Forty 3-unit IFDPs were fabricated on a mandibular right second premolar and second molar of a typodont cast. Samples were fabricated from the following materials; auto-polymerized polymethyl methacrylate (conventional resin), CAD/CAM PMMA (milled resin) and two different CAD/CAM 3D-printed composite resins; digital light processing Asiga (DLP AS) and stereolithography NextDent (SLA ND). Mechanical properties were compared between the studied materials using Kruskal–Wallis test, followed by multiple pairwise comparisons using Bonferroni adjusted significance. There was a significant difference in flexural strength and microhardness between the studied materials (p < 0.001), with the highest mean ± SD reported in the milled IFDPs (174.42 ± 3.39, 27.13 ± 0.52), and the lowest in the conventional IFDPs (98.02 ± 6.1, 15.77 ± 0.32). Flexural strengths differed significantly between the conventional IFDPs and all materials except DLP AS. The highest elastic modulus was recorded in the milled group, and the lowest in the SLA ND group (p = 0.02). In conclusion, superior flexural strength, elastic modulus, and hardness were reported for milled IFDPs. SLA ND printed IFDPs showed comparable mechanical properties to milled ones except for the elastic modulus.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of CAD/CAM Milling and 3D-Printing Fabrication Methods on the Mechanical Properties of 3-Unit Interim Fixed Dental Prosthesis after Thermo-Mechanical Aging Process

et al. 2022

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Marginal and internal fit and fracture resistance of three‐unit provisional restorations fabricated by additive, subtractive, and conventional methods

Falahchai

Rahimabadi

Khabazkar

et al. 2022

Clinical & Exp Dental Res

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Objectives: To compare the marginal and internal fit and fracture resistance of three-unit provisional fixed dental prostheses (FDPs) fabricated by additive, subtractive, and conventional methods. Material and Methods: Eighty 3-unit FDPs were fabricated on metal dies of the maxillary right second premolar and second molar by four different techniques (n = 20):The direct method by using autopolymerizing polymethyl methacrylate (PMMA), indirect method by the compression molding technique, subtractive manufacturing by using PMMA blocks, and additive manufacturing by using digital light processing technology.The adaptation of restorations at the marginal, axial, cuspal, and fossa areas was assessed by using the silicone replica technique. After thermocycling and cyclic loading, the fracture resistance was measured by a universal testing machine. Data were analyzed by a twoway analysis of variance (ANOVA), ANOVA, and Tukey test (α = .05). Results:The mean gap measured in the additive group was lower than that in all other groups at all points (p < .05); however, the difference in the marginal gap with the subtractive group was not significant (p = .995). The mean marginal and axial gaps in the subtractive group were significantly lower than the corresponding values in both conventional groups (p < .05). A significant difference existed between all groups regarding the mean cuspal and fossa gaps (p < .05). The mean fracture resistance of the additive group was significantly higher than that of indirect (p = .018) and direct (p < .001) groups, and the fracture resistance of the subtractive group was significantly higher than that of the direct group (p = .020). Conclusion:The digitally fabricated provisional FDPs showed superior marginal and internal fit and higher fracture resistance than the conventionally fabricated FDPs.Between the digital methods, the additive technique yielded superior internal fit.

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Effect of printing orientation on the fracture strength of additively manufactured 3-unit interim fixed dental prostheses after aging

Türksayar

Dönmez

Olcay

et al. 2022

Journal of Dentistry

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Comparison of CAD-CAM and traditional chairside processing of 4-unit interim prostheses with and without cantilevers: Mechanics, fracture behavior, and finite element analysis

Cited by 9 publications

References 28 publications

Influence of CAD/CAM Milling and 3D-Printing Fabrication Methods on the Mechanical Properties of 3-Unit Interim Fixed Dental Prosthesis after Thermo-Mechanical Aging Process

Influence of CAD/CAM Milling and 3D-Printing Fabrication Methods on the Mechanical Properties of 3-Unit Interim Fixed Dental Prosthesis after Thermo-Mechanical Aging Process

Marginal and internal fit and fracture resistance of three‐unit provisional restorations fabricated by additive, subtractive, and conventional methods

Effect of printing orientation on the fracture strength of additively manufactured 3-unit interim fixed dental prostheses after aging

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