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Mechanical properties of 3D‐printed and milled composite resins for definitive restorations: An in vitro comparison of initial strength and fatigue behavior.
- Source :
-
Journal of Esthetic & Restorative Dentistry . Feb2024, Vol. 36 Issue 2, p391-401. 11p. - Publication Year :
- 2024
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DENTAL implants
*STATISTICS
*IN vitro studies
*DENTAL resins
*COMPUTER-aided design
*ANALYSIS of variance
*SCANNING electron microscopy
*DENTAL materials
*DENTAL metallurgy
*MATERIALS testing
*TENSILE strength
*POLYMERS
*DESCRIPTIVE statistics
*THREE-dimensional printing
*DENTAL fillings
*DATA analysis
Subjects
Details
- Language :
- English
- ISSN :
- 14964155
- Volume :
- 36
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Esthetic & Restorative Dentistry
- Publication Type :
- Academic Journal
- Accession number :
- 174934779
- Full Text :
- https://doi.org/10.1111/jerd.13132