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Until now computer supported fabrication concepts in dentistry were mostly limited to the design of crowns and bridges. In the case of model-casting technique, to date no fabrication method offers more efficient production while maintaining the same quality of traditional casting techniques and fulfilling the elastic requirements of the model-casting technique. The following concept of the newly developed SilaPrint RPS gives an insight into the future production procedures for the modelcasting technique.
Computer-supported or 3D implant planning is gaining ever-increasing significance in implantology, not least because dental technician, dentist and patient work together from the beginning of treatment in order to plan the aesthetics and function of the final prosthetic restoration.
Tick, Tock, Tick, Tock, ….we need the restoration tomorrow! We all know about the time pressure dental laboratories are faced in times like today. The statement above is common all over the world. I am travelling a lot for WIELAND and I am always faced with the same question when it comes to the investing in CAD/CAM technology. How fast can I manufacture? Dental laboratories worldwide are following the trend rapidly, moving to a monolithic full contour restoration as an attractive alternative to layered porcelain restorations.
In the following article, Thomas Jobst discusses the method of operation as well as the potential of the Lava Chairside Oral Scanner and the Lava Design Software as illustrated by its use for a complete maxilla/mandibular restoration. The successful outcome depends, as always, on a well-coordinated team of dentist, assistant and dental technician.
CAD-CAM technology impacts many areas of dentistry, but few areas as powerfully as implant placement and restorations. Here, the technology has impacted treatment planning, implant placement and restorations. In the restorative side, the technology has been deployed to dental laboratories primarily, but selection of appropriate technologies enhances the restoring dentists’ options and predictability of treatment as well. This clinical report outlines methods of restoring partially and fully edentulous patients using restorations stabilized with dental implants and suprastructures.
Two years after the milling system ZENOTEC T1 (Fig. 1) has been presented at the IDS in Cologne for the first time, the company WIELAND Dental + Technik (D-Pforzheim) (Fig. 2) grants a fascinating insight into the production processes and technical details of the manufacturing unit. Various business partners are responsible for the technology behind the machine, such as a motor engineering specialist and a company that develops control software. Their know-how is directly integrated into ZENOTEC T1.
This fourth segment of the series is dealing with the different fabrication processes and the different places of CAD/CAM manufacturing.
In dentistry, the CAD/CAM technique is often compared to milling (or, grinding to be exact) of zirconium dioxide, which is not accurate. This technology is limited neither to one material nor to one fabrication method. In principle there are two distinct categories: the subtractive and the generative. Apart from this, there are similar methods availabe.The copy-milling does not need a CAD process. On the other hand, certain methods are workable such as digitalization and a CAD process combined, producing a virtual model. This model can then be transformed in wax (or acrylic) with a wax plotter to be manufactured using conventional methods (casting, pressing).
Technology moves forward quick, especially in the area of implant prosthetics and CAD/CAM produced understructures of any kind. However, even though the CAD/CAM goal is mainly to create a case from beginning to end by computer and automated milling machine, still the manual modeling techniques, where a built-up frame is scanned and then milled, are still the majority. This work flow – modeling, scanning, milling – is in general a newer approach, but the available materials such as all the different modeling waxes or powder liquid resins commonly used did not keep up with this new technology. It requires skill and experience to produce perfectly fitting frames with these materials, frames that are precise enough to fulfil the requirements for implant cases and avoid expensive remakes in the CAM process. To overcome these limitations and make efficient modeling easy for all sorts of cases and for high skilled as well as lesser experienced technicians, a new, universal modeling composite was developed – primopattern.
When one thinks of software for CAD/CAM systems, one normally thinks only of CAD
software, that is, the software needed to plan the dental prosthesis. However, more
detailed analysis of this question reveals a more complex situation. In fact, several
software packages are required:
• Scanning software (acquisition software) Preparation and digitalization of measurement data so that the
scanner will work.
• CAD software (modeling software) For the virtual modeling of the dental prosthesis
• CAM software
For example, the course of the burring needs to be calculated, and the machine controlled to produce the
dental prosthesis. To do this, the specific nature of the production technique and of the material must be
taken into consideration....
CAD/CAM methods can be subdivided according to various viewpoints (Fig. 4). Three different fundamental criteria are data acquisition (scanning), production, and the material used. Almost all the procedures for the manufacture of dental prostheses using equipment are so-called subtractive methods (by asportation). In general, these methods can be divided into digital CAD/CAM systems and analog copying procedures .
Digital CAD/CAM technology has three main components. These components include data acquisition of the preparation, the configuration (CAD) of the prosthesis, and its manufacture (CAM). The first phase involves using a suitable scanning instrument to acquire the threedimensional spatial data of the prepared dental surface and then digitalizing the data.
In the dental world, CAD/CAM has become the talk of the town; it’s on everybody’s lips and in many people’s mouth. The possibility to gather, store and modify data by means of specially tailored software and then to use these data to process dental materials mechanically made it possible to include new materials in dentistry. Today, many problems can be solved innovatively, as CAD/CAM technologies are used, to a greater or lesser extent, in almost every area of dental prosthetics. The range of indications for CAD/CAM technology continues to expand and now encompasses superstructures in implantology.
The new possibilities of processing and refining ceramic materials render previous working steps obsolete and pave the way for new technologies in routine dental applications. The working procedures in the dental laboratory and practice are being transformed by the advent of new methods including data gathering in the oral cavity, application of design and CAM software and material processing procedures such as machining, milling, laser melting, laser sintering and prototyping (Fig. 1).