Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials

Schönberger, Joana; Erdelt, Kurt; Bäumer, Daniel; Beuer, Florian

doi:10.1007/s00784-017-2064-8

Cited by 28 publications

(29 citation statements)

References 29 publications

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“…However, when the extraoral (Group 3) and intraoral (Group 4) CAD/CAM system groups were compared, there was no difference between them in terms of vertical marginal adaptation. Similar results were found in other studies (16,17).…”

Section: Discussionsupporting

confidence: 93%

Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

et al. 2018

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The aim of this is was evaluate the vertical and horizontal marginal adaptation of 3-unit fixed partial denture frameworks fabricated using different techniques and CAD/CAM systems. A total of 40 framework specimens were fabricated and divided into four groups as follows: lost-wax casting (G1); lost-wax casting with welding (G2); extraoral optical scanning of models (3S/DWOS) (G3); intraoral optical scanning (Cerec Bluecam/Sirona) (G4). A reference model was used to simulate a fixed partial denture with three elements (with a central pontic). The frameworks of G1 and G2 were cast in nickel-chromium (NiCr) alloy, whereas those of G3 and G4 were milled in zirconia. In all groups, vertical and horizontal marginal adaptation (over-contour and under-contour) was evaluated using a three-dimensional optical microscope (Quick Scope, Mitutoyo). The results showed higher vertical marginal misfit in G1 than in the other groups (p<0.001). Regarding horizontal marginal misfit, higher over-contour values occurred in G3 than in the other groups (p<0.001). G3 did not show under-contour at all, whereas the other groups did not differ from each other in this regard (p>0.05). Within the limitations of this study, it can be concluded that lost-wax casting with welding is a viable alternative to the use of CAD/CAM systems to fabricate frameworks of three-unit FPDs, since the techniques yielded similar vertical misfit values. Extra-oral CAD/CAM systems showed the highest horizontal misfit (over-contour) compared to other groups.

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Section: Discussionsupporting

confidence: 93%

Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

et al. 2018

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“…The results might not be fully representative for the procedures available today. The soft-and hardware of the CAD/CAM technology has significantly evolved in the last decade, and the accuracy of the procedures has been improved [25]. Internal gap values of zirconia FDP frameworks in the literature ranged from 140(±26)µm in laboratory studies and 130(±56)µm in clinical studies [26,27].…”

Section: Discussionmentioning

confidence: 99%

10-year randomized trial (RCT) of zirconia-ceramic and metal-ceramic fixed dental prostheses

Sailer

Balmer

Hüsler

et al. 2018

Journal of Dentistry

163

158

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“…Other researchers have evaluated the fit of various superstructures produced by the Ceramill system and reported similar, or reduced, levels of misfit compared with those found in this study. Schönberger et al reported a statistically significant difference in terms of internal and marginal fits of the frameworks with the Ceramill system compared with Cercon CAD/CAM systems. Ceramill frameworks exhibited a median adaptation marginal gap value of 21 μm, while Cercon had a value of 27 μm.…”

Section: Discussionmentioning

confidence: 99%

“…The misfit values of CAD/CAM crowns fabricated using the CEREC system are reported to be in the range of 72 to 247 μm, whereas the Ceramill system is reported to exhibit a misfit range of 30 to 77 μm . However, a direct comparison of the two systems in terms of implant‐supported crown adaptation under the same conditions and using the same materials has not been reported.…”

mentioning

confidence: 99%

Internal Adaptation of Implant‐Supported, Polymer‐Infused Ceramic Crowns Fabricated by Two CAD/CAM Systems

Talic

Alfadda

2018

Journal of Prosthodontics

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Purpose: The aim of this in vitro study was to compare the internal 3D adaptation of polymer-infused ceramic crowns fabricated using two CAD/CAM systems: CEREC inLab MC XL and Ceramill Motion 2 (5X). Materials and Methods: Twenty-five implant-supported metal-ceramic crowns were fabricated conventionally using the lost-wax technique, and the outer contour was scanned to serve as a guide for designing the polymer-infused ceramic CAD/CAM crowns. Twenty-five crowns were fabricated using CEREC, and 25 crowns were fabricated using Ceramill. The cement space was set to 20 μm. The Zeiss Accura Microsystem Coordinate Measuring Machine (CMM), Calypso, and Geomagic software were used to measure the 3D accuracy of fit of all crowns to their respective implant abutments. To test for the statistical significance between groups in terms of 3D total distortion, a one-way ANOVA was conducted. The Kolmogorov-Smirnov test was used to investigate the differences in the x, y, and z coordinates. A p-value of 0.05 or less was considered statistically significant at an alpha level of 0.05. Results: Comparing the 3D misfit of metal-ceramic crowns to those of CAD/CAM crowns fabricated using CEREC revealed no significant difference (88.20 ± 36.59 μm vs. 102.45 ± 36.58 μm, p = 0.161). Similarly, no significant difference in 3D total distortion was identified between metal-ceramic crowns and crowns fabricated using Ceramill (88.20 ± 36.59 μm vs. 78.40 ± 31.03 μm, p = 0.336); however, the 3D total distortion of polymer-infused crowns made by Ceramill was significantly reduced compared to that of crowns fabricated by CEREC (78.3 ± 31.0 μm vs. 102.4 ± 36.5 μm, p = 0.019). Conclusions: Polymer-infused ceramic crowns fabricated using CEREC exhibited the least accurate 3D fit. All misfit values of the tested groups were within clinically acceptable levels.

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Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials

Abstract: Both investigated systems showed clinically acceptable values within the limitations of this in vitro study. However, one showed less internal accuracy when regular zirconia was used.

Cited by 28 publications

References 29 publications

Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

Vertical and Horizontal Misfit Analysis of 3-unit FDP Fabricated with Different Techniques and CAD/CAM Systems

10-year randomized trial (RCT) of zirconia-ceramic and metal-ceramic fixed dental prostheses

Internal Adaptation of Implant‐Supported, Polymer‐Infused Ceramic Crowns Fabricated by Two CAD/CAM Systems

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