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What can we look forward too? Lots of fun with new CAD/CAM systems that will enhance dentistry, providing quality restorations quickly. The evolution of an array of new versions of already available systems as well as altogether new systems will provide improved quality, expanded capabilities, and increasing user friendliness. And new materials will be more esthetic, wear more nearly like enamel, and strong enough for full crowns and bridges. We can also look forward to lots of change. Because of the cost of CAD/CAM systems, many clinicians are likely to collaborate by sharing a single system. Laboratories and clinicians may collaborate as well, with data being gathered in the operatory and sent to a laboratory via modem. The fabrication would then be done by the laboratory. Other changes that we cannot even predict are likely to occur in dentistry. Exciting times are here. Automation through dental CAD/CAM systems will, most certainly, change the profession. The impact of that change will only be known in the future. But as the future approaches, the systems and materials available to us will continue to evolve, improve, and enhance dentistry.
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PMID:CAD/CAM in dentistry: a historical perspective and view of the future. 159 43

With a new CAD-CAM technique, we restored and provided esthetic treatment for both natural teeth and fixed prostheses with worn or broken surfaces.
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PMID:Porcelain CAD-CAM veneers. Some new uses explored. 159 28

Laboratory-manufactured gold, ceramic and composite inlays were compared with the CAD/CAM produced CEREC inlay experimentally and clinically. The following systems were examined: Dicor, Optec, Hi-Ceram, Du-Ceram, Cerec, Kulzer, Coltene, SR-Isosit composite inlays, and gold inlays (Degulor C) with adhesive fixation (group I) and with zinc oxide phosphate cement (group II). In the clinical trial inlays in 270 teeth were re-evaluated in a total of 73 patients after 2.3 to 5 years. After 3 years the results obtained with Optec, Hi-Ceram and the Coltene composite inlay were less favorable than those of other systems--statistically however, this difference was of rather low significance (p less than 0.05). Fractures of ceramic inlays occurred in 6 cases within 8 months. 10 failures of ceramic and composite inlays were due to secondary caries.
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PMID:[Clinical results and material behavior of composite, ceramic and gold inlays]. 161 71

The software driving the Cerec CAD/CAM system has recently been updated. In this study, the marginal accuracy of computer-machined porcelain inlays was determined using the original and the updated software. Two types of MOD cavities in Frasaco resin teeth were prepared with either sharp or rounded box corners. The distance of the occlusal and proximal marginal interface was determined using a measuring microscope. The mean occlusal interfacial distance was 52 microns for both programs. Only the box corners showed a significantly larger space, of which the mean value was approximately 200 microns. The updated version improved the marginal accuracy at the box corners. Further reduction of the interfacial distance was accomplished by rounding the sharp box corners.
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PMID:Marginal accuracy of CAD/CAM inlays made with the original and the updated software. 162 22

The aim of this study was to evaluate the efficiency of Cerec CAD-CAM grinding discs coated with a standard (StD) and experimental (FeD) diamond pattern using 126 microns and 91 microns diamond grain sizes on each coating. The four types of grinding discs (StD126/91, FeD126/91) were used to mill the same standard mod inlays from blocoff+ (10 x 12 x 15 mm) of feldspathic porcelain (Vita) vs. Dicor MGC glass ceramic (Dentsply). The millings were performed on 12 Cerec units (Siemens) simultaneously for each combination of type of disc and type of material. Using porcelain, the discs milled the following median numbers of inlays: StD126: 6.3, StD91: 3.5 (p less than 0.01) and FeD126: 9.5, FeD91: 8.4. The milling efficiency of FeD91 was significantly (p less than 0.001) higher than that of StD126. Damaging effects on inlay margins were observed; degree 0: StD126 = 35% and FeD126 = 25%; degree 2: StD126 = 10% and FeD126 = 25%. Using Dicor MGC glass ceramic the median number of milled inlays was generally low (StD126: 4.0, StD91: 1.0, FeD126: 3.0, FeD91: 2.0). Damaging degree 3 occurred as follows; StD126 = 2.1%; FeD126 = 4.3%; FeD91 = 0.8%. Concluding from the observed milling efficiency and damaging effects, the standard disc StD126 was judged to offer the best compromise for milling both glass ceramic and porcelain material.
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PMID:[The service life of Cerec abrasive disks]. 165 Sep 64

CAD/CAM (computer-assisted design/computer assisted manufacturing), although devised 20 years ago, has only been available for routine dental practice for 2 years. As a supplement to the conventional methods for making dental prostheses, CAD/CAM will have profound effects on the dental profession. CAD/CAM will improve versatility, accuracy, and cost effectiveness and will be a part of routine dental practice by the beginning of the 21st century.
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PMID:CAD/CAM imaging in dentistry. 177 59

In the past decade there has been an increased desire by the profession and the public for an aesthetic restoration that will restore a posterior tooth to its original form and function. The currently available aesthetic posterior restoration materials and techniques are porcelain, cast ceramic, direct composite, direct-indirect composite, indirect composite, and CAD-CAM fabrications. The indications and contraindications of these restorative materials and proper diagnosis and case selection are described.
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PMID:Comparison of aesthetic posterior restorations. 181 43

The radiopacity of two new ceramic restorative materials (Dicor MGC and Cerec Vita Blocks) manufactured for use in producing direct inlays with the 'Cerec CAD-CAM' system was determined. Dicor MGC had a radiopacity significantly greater than that of enamel, while Cerec Vita Blocks had a radiopacity significantly less than that of dentine. It is concluded that Dicor MGC has a radiopacity suitable for its use as an intracoronal restorative for posterior teeth. The low radiopacity of Cerec Vita Blocks means that the use of radiopaque luting cement is essential to permit detection of secondary caries around restorations of this material. Furthermore, marginal overhangs around restorations made from Cerec Vita Blocks will be difficult to detect radiographically.
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PMID:Radiopacity of direct ceramic inlay restoratives. 181 81

The advent of computers and interactive computer graphics laid the groundwork for a revolution in dentistry. Dental CAD/CAM systems can at least match the quality of cast restorations. With the automation, consistency in quality is also provided. The dental CAD/CAM system can simplify the effort required to produce a restoration. With new technologies for fabrication (like milling and edm), a whole array of new materials, which were historically difficult or impossible to manipulate, suddenly become viable possibilities. When used in the dental office, many of the systems eliminate the need for impressions and can produce a restoration while the patient waits. A dental revolution is underway, providing exciting possibilities for restorative dentistry.
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PMID:CAD/CAM in dentistry. 181 62

The application of computers in restorative dentistry make it possible to fabricate ceramic restorations. The dental CAD/CAM system CEREC (Siemens AG Co.) is available to produce inlays and veneers in the dental office in a single appointment.
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PMID:[Computer-assisted creation and fabrication of ceramic inlays and veneers]. 188 22


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