Digital Scanning in the Everyday General Practice
Intraoral scanners are a key component of today’s digital workflow
The digitization of the dental office is in full swing in 2014. This transformative process in the practice of dentistry began with the onset and implementation of the original CEREC® system (Sirona, www.sirona.com) in 1984. The ability to scan a preparation in the mouth, take that data and convert it to a software algorithm, and then turn that algorithm into useful information that can be sent directly to a milling unit to fabricate a ceramic restorative product has forever changed the workflow of the traditional dental office.
Although not every new development has succeeded, the evolution of the digital workflow to where it is today and where it is going next has occurred at a brisk pace. In fact, few who started this process years ago could have predicted the trajectory the dental profession is now on to digitize the entire workflow. The ability to think and dream of what we would like to accomplish and then to take that vision to fruition is the dynamic force that creates the passion for innovation in a rapidly transformative environment.
How Chairside Scanning Has Changed
Digital chairside scanning itself is not a new phenomenon; what is new is the changing role of the chairside scanners. In the past, these devices were connected to a chairside milling unit, which allows a dentist to fabricate a restorative solution that can be placed the same day the tooth is prepared.
There are many advantages to this approach. The major advantage is same-day dentistry for both the patient and the dentist. While the same-day benefit is obvious for the patient, it also benefits the dentist because once the return on investment is realized, which is usually once a dozen or so units have been manufactured and placed, per month, it decreases the dentist’s laboratory bill. It also gives the dentist more control over the restorative procedure and the material used in that procedure.
When the practice does not have its own milling unit, a popular alternative in digital chairside scanning is to send the digital workflow to the clinician’s laboratory of choice. For the general practice that sends multiple indirect units to a laboratory, the digital workflow gives the dentist the ability to choose the laboratory, material, and turnaround time, thereby allowing him or her to retain control of the entire process. A tremendous advantage to this method is that the data is never lost. Unlike a traditional impression that needs to be taken and sent out to a dental laboratory, the digital impression is sent via e-mail over a network and thus can be traced and filed in the system or on a hard drive back-up. If an unforeseen occurrence does happen, the file can easily be resent to the laboratory without inconveniencing the patient for a rescan.
Digital chairside scanning can be used for both traditional crown-and-bridge restorations and implant-supported restorations. Implant companies have learned that by digitizing the workflow they can make custom abutments milled out of titanium, zirconia, or lithium disilicate that are superior to stock abutments. The choice of abutment material can be dictated by where in the mouth the implant is being placed, as well as the patient’s esthetic desires. For example, in the anterior, a zirconia or lithium disilicate abutment might be a better option because of the higher demand for premium esthetics. In the posterior, where esthetics is usually not as important, an implant replacing a lower molar might require a more robust abutment able to withstand the dynamic forces that need to be spread over the entire surface area of the crown.
The use of dedicated scan bodies for different implant systems is now a major growth area. Both implant companies and digital milling centers have started to focus on manufacturing these restorative parts as their use continues to increase and, as a result, the demands of the software increase as well. However, much more development needs to occur to push the system into becoming a more convenient and efficient end product for the patient, the dentist, and the laboratory ceramist.
Digital Chairside Scanning Systems
The digital workflow now enables laboratories and computer design centers to “rip” a scan and design the final prosthesis using different software systems. The laboratory ceramist can design a crown, veneer, onlay, or bridge out of either full-contour zirconia (eg, Lava™ Plus, 3M ESPE, www.3mespe.com; BruxZir®, Glidewell Laboratories, www.glidewelldental.com) or lithium dislicate (eg, IPS e.max®, Ivoclar Vivadent, www.ivoclarvivadent.us). These restorations are milled, stained, and polished in the laboratory, then returned to the dentist on a model prescribed from a chairside system.
Currently, there are quite a few chairside scanning units available, including the 3M™ True Definition Scanner (3M ESPE), iTero® (Align Technology, Inc., www.itero.com), Planmeca PlanScan™ (E4D Technologies, www.e4d.com), TRIOS® Color scanner (3Shape, www.3shape.com), and CS 3500 (Carestream Dental, www.carestreamdental.com). Some systems require a contrast medium, such as titanium dioxide, to capture data points, whereas others do not. In addition, each system varies in its capture mechanism.
For example, the iTero takes images and stiches them together to create a complete image. The True Definition Scanner captures 20 3-dimensional images per second, in movie form, to create an image. With both of these systems, the data packets can then be sent, wirelessly, back to the companies to manufacture models or to laboratories that can unzip the files, import them into laboratory software, design a restoration, and mill the final prosthesis without the use of a model. This newest approach streamlines the process. By eliminating the need for a model, a restoration can be manufactured and sent back to the dentist in as little as 3 days; in the future, there exists the possibility of a restoration being completed in as little as the next day or the same day if regional milling centers open closer to the sending dentists’ offices.
Barriers to Adoption
Currently, the main objection to digital chairside scanning is the initial cost of the equipment. Although it is high, this cost can be offset in a busy restorative practice by comparing it to the practice’s total annual cost of traditional impression material.
For some clinicians, the second objection might be the size of the image-capture wands. The wands that house the chips are getting smaller with each generation, just as smartphones, tablets, and computers do in the rest of the technology world.
The final main area of objection concerns a lack of education and understanding. Once a digital scanning workflow is incorporated into the practice, it is difficult to go back to past processes because the quality of the digital image is so superior to the average analog impression. Relevant clinical team members will need to be trained on any technology implemented in the practice until they feel comfortable and competent.
While no digital scanner is perfect, the continued evolution of these systems refines them and makes them easier to use in a general practice. The day is coming where digital scanners will be a standard piece of equipment in a dental operatory, just like the handpiece or curing light.
Chairside digital scanning is one of the most exciting applications to happen to dentistry. The offshoots of these processes are allowing other fields entry into the digital workflow, giving dentists the ability to provide an even higher level of service and quality to their patients.
About the Author
Robert G. Ritter, DMD
Digital Scanning Showcase
A | iTero®
Align Technology, Inc.’s iTero® imaging system uses innovative powderless technology and features enhanced wand optics for a smaller, more ergonomic fit, an easy-to-use keyboard design, and a larger working surface. iTero delivers substantially reduced capture time through improved optics and enhanced algorithms while maintaining a high standard of digital imaging accuracy and a streamlined workflow.
B | GXC-300™
The GXC-300™ intraoral camera from Gendex is designed to help build doctor-patient communication and treatment acceptance at an affordable price. It can be effortlessly transferred between treatment areas because the camera connects directly to the computer via high-speed USB. In addition, the GXC-300 features quad-image capture buttons to facilitate quick and easy image capture.
C | CEREC® AC with Omnicam
CEREC® AC with Omnicam from Sirona features a revolutionary design with an ergonomic handpiece and special optics to guarantee unsurpassed intraoral access. The rounded camera tube allows for easy rotation and easy-to-learn, intuitive, full-color scanning. The system operates without powder or an opaquing and the tiny camera tip features a scratch-resistant sapphire lens.
D | 3M™ True Definition Scanner
3M™ True Definition Scanner from 3M ESPE delivers powerful 3D video–based scanning technology and provides scanning precision, accuracy, and repeatability for taking digital impressions. The scanning wand is small, ergonomic, and lightweight. The 3M™ Connection Center provides connections to third-party systems, along with the flexibility of open STL file access. Digital files enable better communication with labs and more efficient transfer of information.
E | TRIOS® Color
3Shape’s TRIOS® Color digital impression solution with RealColor™ Technology gives clinicians a tool for accurate 3D capture and realistic visualization. The natural-looking colors make it easy for dentists to distinguish between the different types of restorative materials (eg, metals, enamel, composite), recognize bleeding areas, see color transitions on teeth, and easily identify margin lines with enhanced detail.
F | Planmeca PlanScan®
Planmeca PlanScan® is the innovative, ultra-fast intraoral CAD/CAM system for restorative dentistry. The only intraoral scanner with blue laser technology, its smaller wavelength (450 nm) results in sharper images. In addition, removable tips allow a high level of disinfection with no down time between patients.
G | CS 3500
With Carestream’s CS 3500 intraoral scanner, practitioners can easily acquire true color 2D and 3D images that can be used with CS Restore software to design restorations. Requiring no external heater, powder, or trolley system, the CS 3500 features a unique light guidance system that aides in the capture of the data during the image acquisition process.