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Mechanical properties of 3D-printed and milled composite resins for definitive restorations [Elektronski vir] : an in vitro comparison of initial strength and fatigue behaviorPrause, Elisabeth ...Objective: To evaluate the flexural strength and fatigue behavior of a novel 3D-printed composite resin for definitive restorations. Materials and methods: Fifty disc-shaped specimens were ... manufactured from each of a nanohybrid composite resin (NHC), polymer-infiltrated ceramic network (PICN), and 3D-printed composite resin (3D) with CAD-CAM technology. Biaxial flexural strength (σin ) (n = 30 per group) and biaxial flexural fatigue strength (σff ) (n = 20 per group) were measured using piston-on-three-balls method, employing a staircase approach of 105 cycles. Weibull statistics, relative-strength degradation calculations, and fractography were performed. The results were analyzed with 1-way ANOVA and Games-Howell post hoc test (α = 0.05). Results: Significant differences in σin and σff among the groups (p < 0.001) were detected. The NHC group provided the highest mean ± standard deviation σin and σff (237.3 ± 31.6 MPa and 141.3 ± 3.8 MPa), followed by the PICN (140.3 ± 12.9 MPa and 73.5 ± 9.9 MPa) and the 3D (83.6 ± 18.5 MPa and 37.4 ± 23.8 MPa) groups. The 3D group exhibited significantly lower Weibull modulus (m = 4.7) and up to 15% higher relative strength degradation with areas of nonhomogeneous microstructure as possible fracture origins. Conclusions: The 3D-printed composite resin exhibited the lowest mechanical properties, where areas of nonhomogeneous microstructure developed during the mixing procedure served as potential fracture origins. Clinical significance: The clinical indications of the investigated novel 3D-printed composite resin should be limited to long-term provisional restorations. A cautious procedure for mixing the components is crucial before the 3D-printing process, since nonhomogeneous areas developed during the mixing could act as fracture origins.Source: Journal of esthetic and restorative dentistry [Elektronski vir]. - ISSN 1708-8240 (Vol. 36, iss. 2, 2024, str. 391-401)Type of material - e-articlePublish date - 2024Language - englishCOBISS.SI-ID - 163917571
Author
Prause, Elisabeth |
Malgaj, Tine |
Kocjan, Andraž, 1980- |
Beuer, Florian |
Hey, Jeremias |
Jevnikar, Peter, 1965- |
Schmidt, Franziska
Topics
3D-printed composite resins |
Weibull |
additive manufacturing |
flexural fatigue strength |
flexural strength |
milled composite resins |
staircase approach |
3D-natisnjene kompozitne smole |
aditivna izdelava |
upogibna napetost |
mlete kompozitne smole
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Prause, Elisabeth | |
Malgaj, Tine | 51654 |
Kocjan, Andraž, 1980- | 26457 |
Beuer, Florian | |
Hey, Jeremias | |
Jevnikar, Peter, 1965- | 13229 |
Schmidt, Franziska |
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