Effects of Build Angle and Position in the Build Platform on the Dimensional Accuracy of 3D-Printed Molar Crowns...

Area of Science:

• Biomaterials Science
• Dental Technology
• Additive Manufacturing

Background:

• Digital light processing (DLP) is a 3D printing technology used in dentistry.
• Accurate fabrication of dental restorations like molar crowns is crucial for clinical success.
• Understanding the influence of printing parameters on dimensional accuracy is essential for optimizing DLP applications.

Purpose of the Study:

• To investigate how build angle and build platform position affect the dimensional accuracy of 3D-printed molar crowns using DLP.
• To identify optimal printing parameters for maximizing the accuracy of DLP-fabricated dental restorations.

Main Methods:

• Molar crowns were digitally designed and 3D printed using DLP at various build angles (90-270 degrees) and platform positions.
• Specimens were scanned, and their STL files were compared to the original design using specialized software.
• Dimensional accuracy was assessed using root mean square (RMS) error, 2D comparison, and simulated coordinate measuring machine (CMM) measurements.

Main Results:

• Build angle significantly influenced the dimensional accuracy of DLP prints.
• The build angle of 210 degrees, specifically at the C2 position, yielded the lowest RMS values.
• Deviations were greatest at mesial/distal internal axial surfaces and external finish lines for crowns printed at 90 and 270 degrees.

Conclusions:

• Molar crown placement on the DLP build platform can be flexible.
• Optimizing build angles is critical to minimize resin pooling and layer effects at finish lines, thereby maximizing accuracy.
• A build angle of 210 degrees is recommended for achieving superior dimensional accuracy in 3D-printed molar crowns.