Abstract
The clinical application of 3D-printed provisional restorations is increasing due to expansion of intraoral scanners, easy dental computer-aided design (CAD) software, and improved 3D printing speed. This study compared flexural strength of 3D-printed three-unit fixed dental prostheses with that of conventionally fabricated and milled restorations. A metal jig of two abutments and pontic space and an indenter for flexural strength measurement were fabricated. A three-unit fixed dental prosthesis was designed and manufactured using three additive manufacturing technologies, with subtractive manufacturing and a conventional method as controls. Digital light processing (DLP) group specimens were prepared from a polymethyl methacrylate (PMMA)-based resin and printed with a DLP printer. Stereolithography (SLA) group specimens were prepared from PMMA-based resin and printed with an SLA printer, and fused deposition modeling (FDM) group specimens were from a polylactic acid-based resin and printed with an FDM printer. Flexural strength was investigated using a universal testing machine, and the results were statistically analyzed. DLP and SLA groups had significantly higher flexural strength than the conventional group (p < 0.001). No significant difference was observed in flexural strength between DLP and SLA groups. The FDM group showed only dents but no fracture. The results of this study suggest that provisional restorations fabricated by DLP and SLA technologies provide adequate flexural strength for dental use.
Highlights
Additive manufacturing (AM) technology reduces production process, time, and cost because it involves prototyping and producing custom-made parts in major industries such as automobiles, aviation, and machinery [1]
Digital impressions can be acquired with an intraoral scanner and the data converted into an actual model or used to fabricate provisional restoration using a high-speed 3D printer on the day of tooth preparation
The SLA group had significantly higher flexural strengths observed thanThe the other groups
Summary
Additive manufacturing (AM) technology reduces production process, time, and cost because it involves prototyping and producing custom-made parts in major industries such as automobiles, aviation, and machinery [1]. There is the advantage of small-volume production of various types of consumer goods such as food, toys, and jewelry. AM technology is applied to patient-specific medical services, such as improving the accuracy and safety of surgery through surgical guides [2]. AM technology is used for artificial organ transplantation by manufacturing artificial liver cells and artificial bronchial transplants using bioprinting. Rapid prototyping skulls have been used for planning surgical procedures. Computer-guided implant surgical templates are produced for guided implant surgery [3,4].
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