GAP Australasian-Dentist-May June 2019

Category AustrAlAsiAn Dentist 43 the experienced CereC user prefers to do it by herself: “i am interested in this technology, and – i’ll be completely honest – scanning is so much fun.” After the removal of the inadequate crown and the final preparation, it was time to use the CereC Primescan. Dr stamnitz describes it as follows: “As a long-time user of a CereC Omnicam, i realized immediately that CereC Primescan felt different in my hand. the scanner is even better balanced now. the actual scanning is quick and easy – partially due to the fact that i don’t have to consider specific scanning angles or scan procedures. it all went intuitively and fluidly. the full dental arch scan was completed in less than a minute, which certainly cannot be taken for granted. What made it really special was that the patient was immediately able to see the results on the monitor, with me. the scan was converted into a 3-D image immediately. Compared to previous scanners, i noticed immediately that it is also able to scan other materials, e.g. gold crowns. therefore, no information on the adjacent teeth or antagonists was lost. i consider that to be real progress.” After the scan, the software automatically delineates the preparation margin. if so desired, they can be adjusted manually. “i find that to be a great advantage,” says the digital expert, “because that way, i can decide for myself, every time, whether i want to accept the suggestion – which, by the way, i generally do with a clear conscience.” it is operated via the touch screen which replaces the trackball. it is a tool that many users, including Dr stamnitz, wished for. Finally, the CereC software 5 made an initial suggestion. “i also always look at this very carefully,” she says. “the software can do a lot. i am often surprised at how good the suggestions are. Mostly, as in this case, i am very satisfied after just a few minor adjustments.” The software learns together with the user the reason for the significantly improved initial suggestions with the CereC software 5 is the use of artificial intelligence. With immediate effect, the new generation of software learns, together with the user, so that it is able to create even better initial suggestions for future versions. not only are the initial suggestions for the crown improved by artificial intelligence, the entire workflow is supported by the software, in many areas. in this way, the indications for the restoration are automatically recognized, and the preparation margin is delineated. the axis for the model is also set fully automatically. Dr stamnitz is fascinated by working directly on the screen: “the workflow is very simple, and thanks to the operation via the touch screen, i can maintain my concentration. i can keep my eyes on the screen constantly.” During the designing and the preparations for making the crown, the patient was there, and she could watch her dentist at work. “in cases like this, the treatment experience is always something very special for my patients,” Dr stamnitz remarks. “they are included at all times, and they are able to ask questions and they can experience, live, how the crown is made.” this one was milled from a Celtra Duo block, a zirconia-reinforced lithium silicate with excellent aesthetic properties and a high degree of stability. the crown was ready after just 11 minutes. even during fitting, it was evident that it was a perfect fit. the crown was individualized and glazed with colour and glazing material. then it was cemented into the patient’s mouth with a high-strength, dual cure composite cement adhesive (Calibra ceram). in this case, the overall time required for the treatment was about 90 minutes. this proved to be particularly advantageous to the patient, who was pressed for time. Better quality in less time the accuracy of the scan, and the speed of the data acquisition and processing obviously have an effect on the end result – to an experienced user, this becomes apparent immediately. the structure of the crown, especially on the edges, is highly dependent on the quality of the impression – and this is where it pays to use CereC Primescan. Dr stamnitz: “thanks to the new CereC software 5, the ground or milled restorations are worked even more finely and in more detail. And all of this in an even shorter process, from scan to insertion. i spend the time i save on the entire process on my patients. We gain the time to build up a good relationship with them. We are not simply treating a tooth. We are dealing with a patient every time. that’s exactly who should be the centre of focus. Because there is more to the lovely smile we help them to achieve, than just attractive, healthy teeth.” u Image 1: Initial situation, tooth 37 Image 3: The preparation margin is automatically delineated by the software, but, if desired, it can also be adjusted manually. Image 5: The user interface for the beginning of the restoration of the crown. Image 2: Scan of lower jaw, with prepared tooth 37. Image 4: The user interface for designing the restoration, which can be operated via the touch screen. Image 6: Final situation for tooth 37. lInICal