PubMed ID (PMID): 21877374Pages 87-88, Language: English, GermanBenz, Christoph
PubMed ID (PMID): 21877375Pages 93-103, Language: English, GermanNeugebauer, Jörg / Kistler, Frank / Kistler, Steffen / Zündorf, Gerhard / Freyer, Dirk / Ritter, Lutz / Dreiseidler, Timo / Kusch, Jochen / Zöller, Joachim E.
The increased availability of devices for 3D radiological diagnosis allows the more frequent use of CAD/CAMproduced surgical guides for implant placement. The conventional workflow requires a complex logistic chain which is time-consuming and costly. In a pilot study, the workflow of directly milled surgical guides was evaluated. These surgical guides were designed based on the fusion of an optical impression and the radiological data. The clinical use showed that the surgical guides could be accurately placed on the residual dentition without tipping movements. The conventional surgical guides were used as a control for the manual check of the deviation of the implant axis. The direct transfer of the digital planning data allows the fabrication of surgical guides in an external center without the need of physical transport, which reduces the logistic effort and expense of the central fabrication of surgical guides.
Keywords: digital workflow, 3D diagnosis, cone-beam CT, digital implant planning, guided implant placement, telemedicine, reduced logistics, image fusion
PubMed ID (PMID): 21877376Pages 105-109, Language: English, GermanQuooß, Alexandra / Ruge, Sebastian / Kordaß, Bernd
The following article describes a method for the clinical depiction and documentation of the strength, extent, and location of occlusal contact areas on the basis of digitized bite records. Bite records made of low-viscosity, additioncured silicone in centric occlusion are digitized in a document scanner using incident and transmitted light scanning. Layer thicknesses
Keywords: occlusion, centric occlusion, digital occlusion, virtual articulator, contact point analysis
PubMed ID (PMID): 21877377Pages 111-118, Language: English, GermanKober, Cornelia / Berg, Britt-Isabelle / Berg, Scott / Leiggener, Christoph / Buitrago-Téllez, Carlos / Kordaß, Bernd / Zeilhofer, Hans-Florian / Sader, Robert
Introduction: Magnetic resonance imaging (MRI) has been approved as an appropriate radiological modality for temporomandibular joint (TMJ) diagnosis, whereas the results of international multicenter studies impressively show the limitations of static three-dimensional MRI. The state of the art for dynamic imaging of the TMJ in real-time are TrueFISP sequences in one sagittal plane. In order to support the diagnostics, a computer-assisted visualization procedure has been developed by the authors for both the static and dynamic MRI.
Methods: A number of validated sequences are available for the static 3D-MRI within the clinical routine. For dynamic MRI in real-time, True-FISP sequences in one sagittal plane with a slice thickness of 5-10 mm and 1.3 mm × 1.3 mm spatial resolution were applied. Both the dynamic and static MRI datasets are animated and visualized using the computer- assisted procedure.
Results: The computer-assisted procedure reliably supported the clinical diagnosis, especially the visibility of the articular disc was enhanced. On the basis of the static MRI, a 60-year-old patient was diagnosed with anterior disc displacement without reduction. In contrast, by the dynamic MRI, it was recognized how the articular disc was firstly somehow stretched and flattened before the mandibular condyle again glided under the disc, thus resulting in an anterior disc displacement with reduction.
Conclusion: These results endorse the relevance of realtime diagnosis for the TMJ. The computer-assisted visualization has been approved as a reliable help for clinical diagnosis.
Keywords: temporomandibular joint, articular disc, anterior disc displacement with reduction, anterior disc displacement without reduction, MRI, dynamic MRI, real-time imaging, computer-assisted visualization, direct volume rendering
PubMed ID (PMID): 21877378Pages 119-127, Language: English, GermanRuge, Sebastian / Quooß, Alexandra / Kordaß, Bernd
Virtuelle Artikulation ermöglicht es Grenzen mechanischer Modellsituationen zu überwinden. Ein großer Vorteil sind neue Visualisierungskonzepte. In dieser Arbeit wurden die Kauflächen der Unter- und Oberkieferzahnreihen mit einem 3-D-Scanner digitalisiert und die reale Unterkieferbewegung mit dem Ultraschall-Messsystem Jaw- Motion-Analyser aufgezeichnet. Ein Kopplungshilfsteil, das klinisch am Patienten eingesetzt wurde, sorgte für die präzise Referenzierung von Bewegungs- und Scandaten. Das vereinigte die Abformung der Kauflächen des Ober- und Unterkiefers. Zugleich wurden mit dem JMA-System das Kopplungsteil und die Unterkieferlage räumlich erfasst. Ziel dieses virtuellen Artikulators war es, die Kiefersituation beim Kauen zu visualisieren. Zur Analyse der okklusalen Kontaktpunkte wurden dynamische Bilder generiert, in denen Annäherungs- und Kontaktbereiche markiert wurden. Die Unterkieferbewegung konnte auch dazu genutzt werden, eine Hülloberfläche zu gestalten, die die maximal mögliche Raumnutzung des Unterkiefers abbildete. Eine solche Hülloberfläche stellt eine Art virtuelles FGP-Registrat dar und kann für virtuelle Zahnrestaurationen verwendet werden. Sie hilft, in der virtuellen Welt den okklusalen Spaltraum zu quantifizieren. Dabei lässt sich die Variabilität der Kaufunktion individuell erfassen und nutzen.
Keywords: virtueller Artikulator, virtuelle Okklusion, dynamische Okklusion, okklusaler Kontakt, Okklusion, Variabilität
PubMed ID (PMID): 21877379Pages 129-138, Language: English, GermanArnetzl, Gerwin V. / Arnetzl, Gerwin
Amelogenesis imperfecta refers to a hereditary dysplasia of the enamel. As a result of various defects, qualitatively and/ or quantitatively abnormal enamel forms, while the dental structure remains normal. The following article describes the condition and presents the case of an 8-year-old boy who was dentally reconstructed both functionally and aesthetically using the adhesive technique and machinable high performance polymer restorations.
Keywords: Cerec, CAD/CAM technology, Amelogenesis imperfecta, hereditary enamel defects, high performance polymers
PubMed ID (PMID): 21877380Pages 139-146, Language: English, GermanRauscher, Otmar
The Cerec InLab software 3.80 allows for the fabrication of implant abutments and crowns without taking impressions. The intraoral optical impression is taken with the help of what is termed "scanbodies". The custom-made zirconia abutments are bonded to a titanium base and can thus be fastened with high torques without creating tensile stress.
Keywords: abutments, zirconia, superstructure, titanium base
PubMed ID (PMID): 21877381Pages 147-153, Language: English, GermanCardelli, Paolo / Turrini, Roberto / Bulletti, Alberto / Castelli, Gorgio / Vanini, Andrea / Pagnoni, Andrea
The way we collect, store, and share dental records of our patients is rapidly becoming digital. Many programs have been designed to run on a single computer or local network to handle various tasks, so selecting a system can be complex; it can require high acquisition costs, update fees, and installation difficulties. The purpose of this article is to explain the architecture, characteristics, and advantages related to Web-based Management Software. In particular, this article describes the first Web-based Electronic Medical Record (DocSapiens.com), which is able to view and edit DICOM files directly online.
Keywords: software, management, managing, Internet, EMR, DICOM
PubMed ID (PMID): 21877382Pages 155-162, Language: English, GermanFrank, Elmar / Frank, Sigrid
Dentistry and dental engineering today are characterized by rapid developments in the sectors of digital dentistry as well as new materials and methods. The effective management of new workflows is at the same time a challenge and a source of motivation for the entire practice or laboratory team.