CAD/CAM for dental restorations-some of the curious challenges

Rekow, E. Dianne; Erdman, Arthur G.; Riley, D. R.; Klamecki, Barney E.

doi:10.1109/10.133223

Cited by 55 publications

(36 citation statements)

References 4 publications

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“…The D810, an EAT scanner from 3Shape, is also one of the most popular scanners for the same reasons. These methods of scanning systems have been used to fabricate prostheses in clinics, and earlier studies have shown that their accuracy is acceptable for longterm clinical success [18][19][20] . These scanners were selected for this study as representative systems.…”

Section: Methodsmentioning

confidence: 99%

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

Shimizu

Shinya

Kuroda

et al. 2017

Dental Materials Journal

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The accuracy of prostheses affects clinical success and is, in turn, affected by the accuracy of the scanner and CAD programs. Thus, their accuracy is important. The first aim of this study was to evaluate the accuracy of an intraoral scanner with active triangulation (Cerec Omnicam), an intraoral scanner with a confocal laser (3Shape Trios), and an extraoral scanner with active triangulation (D810). The second aim of this study was to compare the accuracy of the digital crowns designed with two different scanner/CAD combinations. The accuracy of the intraoral scanners and extraoral scanner was clinically acceptable. Marginal and internal fit of the digital crowns fabricated using the intraoral scanner and CAD programs were inferior to those fabricated using the extraoral scanner and CAD programs.

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Section: Methodsmentioning

confidence: 99%

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

Shimizu

Shinya

Kuroda

et al. 2017

Dental Materials Journal

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“…Several fabrication approaches have been recently introduced that allow the construction of 3-D HA scaffolds with engineered architecture and porosity [16][17][18][19][20]. Most of these approaches rely on computeraided design to build structures in a predefined pattern with controlled feature size and geometry without the need for subsequent machining.…”

Section: Introductionmentioning

confidence: 99%

Concentrated hydroxyapatite inks for direct-write assembly of 3-D periodic scaffolds

2005

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“…Other studies have reported that the error in the milling was small. 3,23 The error in the measurement process would be greater than the error in the milling process, especially with the availability of five-axis milling machines. It would seem logical for manufacturers to devote their attention to the data acquisition process.…”

Section: Discussionmentioning

confidence: 99%

“…CAD/CAM systems typically consist of a scanning system (data acquisition), design software (modeling), and a fabrication machine (milling). 3 During the entire CAD/CAM process, each sequential step will add to final inaccuracies. Therefore, any procedural step that minimizes cumulative error of the CAD/CAM procedure is of significant clinical interest.…”

Section: Introductionmentioning

confidence: 99%

The Accuracy of Optical Scanning: Influence of Convergence and Die Preparation

Chan¹,

Chung²,

Haines³

et al. 2011

Operative Dentistry

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SUMMARY The purpose of this study was to determine the reliability of the data acquisition and modeling process of laser and white light scanners by evaluating the reproducibility of digitized simulated crowns with different convergences. A secondary purpose was to analyze the influence of die preparation by testing this hypothesis with a set of dies without ditching compared with a set with well-defined margins. Ditching or trimming the die defines the position of the margin and acts as a guide to gingival contour when the restoration is being waxed. Two light scanners (a white light optical scanner [Steinbichler Gmbh, Neubeuern, Germany] and red laser light scanner [TurboDent System, Taichung, Taiwan]) were evaluated. Two sets of simulated crowns were fabricated as cone frustrum models with a total occlusal convergence (TOC) of 0°, 5°, 10°, 15°, 20°, and 25° and a 9-mm base and 3-mm height using a precision milling machine and computer-aided design/computer-aided manufacturing (CAD/CAM) technique. One set of the dies was ditched immediately below the finish line to enhance marginal definition. Each die was optically digitized five times directly with the two different measuring systems. The area of each triangle in the scan that is occlusal to the margin line was calculated and summed to produce the final surface area measurement provided. The digitizing error was compared with the computed surface area of the original master die sets and compared with a paired t-test (df=4; 95% CI). There was no difference in accuracy of the untrimmed dies between the two systems evaluated. We also did not find any difference in the 0° (p=0.12) and 5° degree (p=0.21) groups among the ditched dies. However, when the TOC exceeded 5°, there was a significant difference between the two groups, with the laser groups having a smaller error percentage. Three-dimensional light scanning was not affected by the convergence angle except in the 0°-5° range. Trimming the dies greatly affected the accuracy of scanning.

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CAD/CAM for dental restorations-some of the curious challenges

Cited by 55 publications

References 4 publications

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

The accuracy of the CAD system using intraoral and extraoral scanners for designing of fixed dental prostheses

Concentrated hydroxyapatite inks for direct-write assembly of 3-D periodic scaffolds

The Accuracy of Optical Scanning: Influence of Convergence and Die Preparation

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