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Greifswald, Germany

Kober C.,Hamburg University of Applied Sciences | Berg B.-I.,University of Basel | Berg S.,Clinical Center | Leiggener C.,University of Basel | And 4 more authors.
International Journal of Computerized Dentistry | Year: 2011

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.

Quooss A.,Center for Dental | Ruge S.,Center for Dental | Kordass B.,Center for Dental
International Journal of Computerized Dentistry | Year: 2011

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 ≤ 20 μm were interpreted as occlusal contacts and classified as belonging to the anatomical structures of the occlusal surfaces. This procedure is of particular significance for epidemiological studies, but also of interest for dental practices and laboratories, since it can be used as a simple method of continuous quality control, documentation, and archiving of the patient's current occlusal contact situation.

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