Different CAD/CAM-processing routes for zirconia restorations: influence on fitting accuracy

Kohorst, Philipp; Junghanns, Janet; Dittmer, Marc; Borchers, Lothar; Stiesch, Meike

doi:10.1007/s00784-010-0415-9

Cited by 85 publications

(76 citation statements)

References 30 publications

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“…This result agreed with previous studies which showed that the CAD/CAM fabrication method produced restorations with better accuracy of fit than conventional casting 3,[5][6][7][8][9] . The choice of zirconia material in this study, i.e., HIP zirconia ceramic versus presintered zirconia ceramic, had no effect on strain development in the all-ceramic frameworks.…”

Section: Strain Developmentsupporting

confidence: 92%

“…It has been pointed out that superstructures fabricated by conventional methods such as casting failed to achieve a passive fit [2][3][4] . When multi-unit fixed restorations were fabricated using the computer-aided design/computeraided manufacturing (CAD/CAM) technique, greater accuracy was achieved [5][6][7][8][9] . The attractiveness of CAD/ CAM fabrication procedures is further boosted with the use of high-strength ceramic materials such as zirconia ceramic 10) .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Karl¹,

Graef²,

Wichmann³

et al. 2012

Dent. Mater. J.

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The effect of ceramic veneering on the passivity of fit of cast metal and CAD/CAM-fabricated zirconia ceramic implant-supported three-unit cement-retained restorations was investigated, as well as the effect of misfit stress on the marginal integrity of ceramic veneers. Superstructures were fabricated using cast metal or by CAD/CAM milling of presintered or HIP zirconia ceramic (n=10). Before and after veneering, strain gages were used to measure in vitro the strain developed in all the restorations as a result of superstructure fixation. Fluorescent penetrant method was used to detect microcracks developed in ceramic veneers. Cast frameworks showed significantly higher strain values than CAD/CAM frameworks (p=0.000). Veneering significantly increased strain development in all CAD/CAM frameworks (p=0.000). Compared to zirconia ceramic restorations, significantly more microcracks were observed in cast restorations (p=0.000) both before and after superstructure fixation.

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Section: Strain Developmentsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Karl¹,

Graef²,

Wichmann³

et al. 2012

Dent. Mater. J.

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show abstract

“…Evaluation of the mean marginal gaps (calculated by 20 copings per sample series ×24 measurement points per coping) was performed according to the literature 11,18,26,30) as well as by considering the averaged maximum marginal gap within one system or parameter (calculated only by the maximum values of each coping within one sample series). Data are expressed as means with standard deviations and 95% confi dence intervals.…”

Section: Discussionmentioning

confidence: 99%

“…The achieved fi tting accuracy is determined by two main factors: the scanner system used for data collection and the milling systems. Regarding the milling systems, it can be distinguished between industrial fabrication and a milling center by providing the CAD data online 1,26) . To date, no study has been conducted to evaluate the impact of various factors within one production line.…”

Section: Introductionmentioning

confidence: 99%

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

et al. 2012

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This study evaluated the effect of different parameters on the marginal precision of CAD/CAM-fabricated zirconia copings. Specimens (n=60) were fabricated with two different scanners and two milling systems. The copings were evaluated with respect to their mean and average maximum marginal gaps. A two-way analysis of variance (ANOVA) (α=0.05) was used to evaluate the effect of different parameters (scanner, milling process) on marginal accuracy. The mean (averaged maximum) marginal gaps ranged from 57.9 (112.2 μm) to 71.0 (144.6 μm) in the "as machined" state. After manual adaptation, the respective values ranged from 54.6 (98.0 μm) to 59.9 (107.7 μm). The system and manual adaptation variables were found both to have multiple signifi cant effects on the marginal gap size and to have a complex interaction. Thus, synchronized/validated processing chains should be preferentially used to guarantee optimal fi tting accuracy for CAD/CAM zirconia restorations.

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“…84 This processing technique is expected to have a shorter machining time for a less dense material, but one must keep in mind that the final sintering will promote dimensional changes due to shrinkage, which may lead to prosthetic restoration misfit. 85 Although the CAD-CAM systems described above are already well established in the dental market, they present a major drawback related to the great waste of material upon machining. The waste corresponds to approximately 90% of the prefabricated block for a typical restoration 86 and leftovers from these dental restorations are not reusable.…”

Section: Novel Processing Technologiesmentioning

confidence: 99%

Dental ceramics: a review of new materials and processing methods

et al. 2017

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The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.

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Different CAD/CAM-processing routes for zirconia restorations: influence on fitting accuracy

Cited by 85 publications

References 30 publications

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Microfractures in metal-ceramic and all-ceramic implant-supported fixed dental prostheses caused by superstructure fixation

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

Dental ceramics: a review of new materials and processing methods

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