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Influence of Different Build Directions on the Fracture Load and Surface Roughness of Additively Manufactured
The International Journal of Prosthodontics
|June 7, 2024
Summary
Additive manufacturing of dental provisionals at a 0-degree build direction yields the highest fracture load and lowest surface roughness. This 3D printed approach offers superior mechanical properties compared to other provisional materials.
Area of Science:
- Dental Materials Science
- Additive Manufacturing
- Prosthodontics
Background:
- Dental provisional restorations are crucial for maintaining function and aesthetics during treatment.
- Additive manufacturing (3D printing) offers potential for customized dental restorations.
- Optimizing printing parameters is essential for achieving desired mechanical properties.
Purpose of the Study:
- To evaluate the impact of build direction (0, 45, 90 degrees) on the fracture load and surface roughness of additively manufactured three-unit provisional restorations.
- To compare the performance of additively manufactured provisionals against those made with conventional dental materials.
Main Methods:
- Three-unit provisional restorations were additively manufactured at 0, 45, and 90-degree build directions.
- Control groups included provisionals fabricated from heat-polymerized PMMA, autopolymerizing resin, and bis-acryl composite resins.
- Fracture load and surface roughness were measured for all groups.
- Statistical analysis was performed using one-way ANOVA and Tukey tests.
Main Results:
- Additive manufacturing at a 0-degree build direction resulted in the highest fracture load (596 N).
- Autopolymerizing bis-acryl resin showed the lowest fracture load (464.9 N).
- Heat-polymerized PMMA exhibited the lowest surface roughness (0.132 µm), while autopolymerizing PMMA had the highest (0.836 µm).
- Significant differences (P = .001) were observed in fracture load and surface roughness across build directions and between material groups.
Conclusions:
- Build direction significantly influences the mechanical properties of additively manufactured dental provisionals.
- Printing at a 0-degree orientation optimizes fracture load and minimizes surface roughness.
- Additively manufactured provisionals printed at 0 degrees demonstrate superior fracture load compared to conventional materials, with comparable surface roughness to heat-polymerized provisionals.
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