Precision of fit: The Procera AllCeram crown

May, Kenneth B.; Russell, Melinda M.; Razzoog, Michael E.; Lang, Brien R.

doi:10.1016/s0022-3913(98)70002-2

Cited by 225 publications

(181 citation statements)

References 24 publications

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“…It is important to produce restorations with a uniform cement space so as not to compromise the retention and resistance forms, especially for all-ceramic restorations that have a brittle behavior. 29 Metal-ceramic restorations are the gold standard for prosthetic restorations, and there is a concern regarding the ability of CAD-CAM technology to produce restorations with such precision of adaptation. Studies that measured the marginal gap of three-unit metal-ceramic FPDs in vivo reported values between 67 to 85 µm.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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The objective of the study was to measure the marginal and internal fit of zirconia-based all-ceramic three-unit fixed partial dentures (FPDs) (Y-TZP -LAVA, 3M-ESPE), using a novel methodology based on micro-computed tomography (micro-CT) technology. Stainless steel models of prepared abutments were fabricated to design FPDs. Ten frameworks were produced with 9 mm² connector cross-sections using a LAVA TM CAD-CAM system. All FPDs were veneered with a compatible porcelain. Each FPD was seated on the original model and scanned using micro-CT. Files were processed using NRecon and CTAn software. Adobe Photoshop and Image J software were used to analyze the crosssectional images. Five measuring points were selected, as follows: MG -marginal gap; CA -chamfer area; AW -axial wall; AOT -axio-occlusal transition area; OA -occlusal area. Results were statistically analyzed by Kruskall-Wallis and Tukey's post hoc test (α = 0.05). There were significant differences for the gap width between the measurement points evaluated. MG showed the smallest median gap width (42 µm). OA had the highest median gap dimension (125 µm), followed by the AOT point (105 µm). CA and AW gap width values were statistically similar, 66 and 65 µm respectively. Thus, it was possible to conclude that different levels of adaptation were observed within the FPD, at the different measuring points. In addition, the micro-CT technology seems to be a reliable tool to evaluate the fit of dental restorations.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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“…The ceramist carries out the veneering of the frameworks in a powder layering or overpressing technique. [4][5][6][7] …”

Section: B) Laboratory Productionmentioning

confidence: 99%

“…Thus, production steps 1 and 2 take place in the dental laboratory, while the third step takes place in the centre. 5,8 As a result, the configuration of the prosthe sis remains in the hands of the dental technician. The benefit of outsourcing CAM production is to be found in the small investment requirement, since only the digitalisation tool and soft ware have to be purchased, still having access to a high quality production pro cess.…”

Section: C) Centralised Productionmentioning

confidence: 99%

“…This type of scanner is distinguished by a high scanning accu racy, whereby the diameter of the ruby ball is set to the smallest grinder in the milling system, with the result that all data collected by the system can also be milled. 5,10 The drawbacks of this data measurement technique are to be seen in the inordinately complicated mechanics, which make the apparatus very expen sive with long processing times com pared to optical systems.…”

Section: B) Mechanical Scannermentioning

confidence: 99%

“…The ground frames can be individually stained in several colours with Vita In-Ceram AL Coloring Liquid. 5,[21][22][23] Examples of grindable alu minum oxide blocks: In-Ceram AL Block (Vita), inCoris Al (Sirona) available in an ivory-like colour (Color F 0.7).…”

Section: Aluminum Oxide (Al 2 O 3 )mentioning

confidence: 99%

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