Additive Manufacturing Strategies

Prosthetic Dental Treatments: Traditional Stone Casts vs. 3D Printed Casts

ST Medical Devices

Share this Article

Egyptian researchers Passent Aly and Cherif Mohsen compare the benefits of 3D printing with conventional techniques for the production of prosthetic dental casts, releasing the findings of their study in ‘Comparison of the Accuracy of Three-Dimensional Printed Casts, Digital, and Conventional Casts: An In Vitro Study.’

In relation to oral and jaw restoration, prosthetics can be critical to the health of many patients. In this study, Aly and Mohsen match conventional stone casts with prosthetic casts 3D printed using stereolithography (SLA), as well as with “digital casts,” that is, 3D scans of existing stone casts. While digital technology is becoming increasingly popular for items like casts—replacing traditional methods with 3D printing for prototyping and creating functional parts—the authors point out that, for clinical practice, such processes must be heavily evaluated first.

In testing the effectiveness of digital casts in this study, Aly and Mohsen used a light desktop scanner to fabricate prototypes. For reference in comparison during experimentation, the researchers used a set of maxillary and mandibular ivory teeth. Five stone casts were made from polyvinylsiloxane impressions.

Maxillary and mandibular conventional stone casts.

“The typodont casts (reference casts) were scanned using intraoral dental scanner (Trios 3Shape) in the following three steps: first maxillary and mandibular casts were scanned separately; the second step involved articulating the maxillary and mandibular arches by utilizing the ‘bite registration algorithm.’ Third and finally, digital casts (n = 5) were exported in STL file format to be integrated into space analysis software,” explained the researchers.

The digital casts were then printed on a ProJet 6000, using VisiJet SL Clear resin.

3D printed mandibular cast.

“The following linear measurements were taken: mesiodistal (MD) and occlusocervical (OC) for first molar, first premolar and canine in addition to intermolar width (IMW) and intercanine width (ICW) on both arches and sides by the same operator,” stated the researchers.

Digital cast with mesiodistal, intercanine, and intermolar measurements

Errors occurred as follows:

“The errors ranged from 0.003 to 0.142 mm for different measurements. In OC, the errors of digital cast were significantly higher than the errors of the other two groups, where the mean of the digital cast = 0.016 compared with 0.004 and 0.007 for the other two groups (p < 0.0001). Similarly, in MD measurements, the error of digital casts (mean = 0.006) was significantly greater than the error of printed casts (mean = 0.003) but similar to those of conventional casts (mean = 0.005) with overall significant difference (p = 0.02). For IMW and ICW, digital casts had significantly greater errors (mean = 0.142 in IMW and 0.113 in ICW) compared with the two other groups (means= 0.019 and 0.008 in IMW and mean = 0.021 and 0.011 in ICW), p < 0.0001.”

Overall, only a ‘minor error’ was noted in accuracy of the 3D-printed casts as compared to the stone casts. The authors were able to confirm the advantages of using SLA printing in that area. They did, however, note a ‘significant difference’ in accuracy for SLA casts compared to digital casts:

“The cause of this error in the arch width measurements is due to the overestimation of digital measurements in comparison to stone and printed casts. Also, distortion of arch happens during scanning of dental casts,” concluded the authors. “But this error is still within the acceptable clinical range which comes in agreement with other studies.

“This study used only one type of intraoral scanners and one type of 3D printers. Also, it is an in vitro study not simulating the conditions in the oral cavity, such as saliva, bleeding, limited mouth openings, and difficulty in vision, which are considered limitations of the current study. Thus, further studies are needed to evaluate the accuracy of other scanners and printers in comparison with the types used in this study. In addition, there is a need for future in vivo studies simulating oral conditions.”

3D printing of prosthetics and implants continues to change the quality of life for individuals in need around the world, whether in dentistry, orthodontics, or even limb replacement.

What do you think of this news? Let us know your thoughts! Join the discussion of this and other 3D printing topics at 3DPrintBoard.com.

[Source / Images: ‘Comparison of the Accuracy of Three-Dimensional Printed Casts, Digital, and Conventional Casts: An In Vitro Study’]

Share this Article


Recent News

$21M Round Fuels 2 Million Points of Metal 3D Printing Light from Seurat

Middle East Deal Spreads 3D Printing Influence of China’s Farsoon



Categories

3D Design

3D Printed Art

3D Printed Food

3D Printed Guns


You May Also Like

To End Animal Testing, BICO & CCS Push FDA Modernization Act

As the world continues developing alternatives to animal testing like bioprinting, in vitro models of human tissues, and predictive computer models, the demand for live animal testing has become outdated...

India’s Primaeam Solutions Opens 3D Printing Service with Materialise

Primaeam Solutions Pvt Ltd, an additive manufacturing (AM) services has announced the opening of a new, 10,000 sq. ft. service bureau located in the firm’s home city of Chennai, the...

3D Printing News Briefs, January 5, 2022: Software, Research, & More

We’re kicking off today’s 3D Printing News Briefs with 3D software, as Materialise has integrated Siemens’ Parasolid with its own Magics software. Moving on, The Virtual Foundry launched a metal...

“World’s Largest Real Concrete 3D Printed Building” Goes up in Oman

COBOD’s additive construction technology has been deployed worldwide, from Germany to Kenya, the U.S. to Belgium. The latest location for the Danish firm’s construction 3D printer is Oman, where COBOD...


Shop

View our broad assortment of in house and third party products.