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Fracture Resistance of 3D-Printed Restorations in Different Thicknesses for Primary Molars
Purpose:
To evaluate the fracture resistance of primary tooth crowns fabricated at different thicknesses using two different 3D-printing technologies: stereolithography (SLA) and digital light processing (DLP).
Materials And Methods:
A typodont primary second molar tooth was scanned. Using the scanned model, three dies and crowns with thicknesses of 0.5, 1.0, and 1.5 mm were created digitally. A total of 60 dies were fabricated from cobalt-chromium (CoCr) using a laser sintering device. Ten crowns per thickness were produced using two types of 3D printers: SLA and DLP. The fracture resistance of the crowns was tested after thermal aging (5/55°C and 30 seconds dwell time). The data were analyzed with independent sample t test.
Results:
There was no significant difference in fracture resistance between the manufacturing methods for crowns in all three thickness groups (P > .05). The highest average fracture value was observed in crowns with a thickness of 1.5 mm manufactured using SLA 3D printing.
Conclusions:
Within the limits of this study, the 3D-printing manufacturing method did not affect the fracture resistance of 3D-printed primary tooth crowns. It was concluded that these crowns have sufficient fracture resistance and can be used as an alternative treatment option for complete crowns of primary teeth.
