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Accuracy evaluation of 3D printed interim prosthesis fabrication using a CBCT scanning based digital model
Young Hyun Kim1, Bock-Young Jung2, Sang-Sun Han1
1Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea.
Plos One
|October 16, 2020
Summary
3D-printed interim crowns using cone-beam computed tomography (CBCT) data showed acceptable marginal gaps for clinical success. This CBCT conversion technique may offer an alternative for digital model acquisition in crown fabrication.
Area of Science:
- Dental Materials Science
- Digital Dentistry
- Biomedical Engineering
Background:
- Traditional methods for creating dental models can be time-consuming and may introduce inaccuracies.
- Advancements in digital imaging and 3D printing offer potential for more efficient and precise dental restorations.
- Cone-beam computed tomography (CBCT) is increasingly used in dentistry for diagnostic imaging and has potential for digital model creation.
Purpose of the Study:
- To evaluate the marginal and internal gaps of 3D-printed interim crowns fabricated from digital models derived from CBCT data.
- To assess the accuracy of digital models generated from CBCT scans compared to intraoral optical scanner (IOS) data.
- To determine the clinical acceptability of gaps in 3D-printed interim crowns.
Main Methods:
- Sixteen polyvinylsiloxane impressions were scanned using CBCT to generate Standard Triangulation Language (STL) files.
- Stone models were fabricated and scanned with an IOS to compare surface accuracy with CBCT-derived STL data.
- Interim crowns were 3D-printed using a photopolymer and digital light-processing technology.
- Marginal and internal gaps were measured using a digital microscope and analyzed statistically.
Main Results:
- The root-mean-square values between CBCT and IOS ranged from 41.00 to 126.60 μm (mean 60.12 μm).
- Mean marginal, internal, and total gaps were 132.96 μm, 137.86 μm, and 135.68 μm, respectively.
- Significant differences were found in the occlusal area compared to the marginal area, but no significant differences were noted between mesiodistal and buccolingual surfaces.
Conclusions:
- The marginal gap of 3D-printed interim crowns based on CBCT STL data falls within acceptable clinical success ranges.
- The CBCT conversion technique shows promise as an alternative method for obtaining digital models for interim crown fabrication.
- Continued development in high-resolution CBCT and digital model conversion may enhance its utility in restorative dentistry.
