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Mit digitalen transversalen Schichtaufnahmen (TSA) als Zusatzprogramm der Panoramaschichtgeräte und der digitalen Volumentomographie (DVT) sind Aufnahmen des Gesichtsschädels in mehreren Ebenen möglich geworden. Beide Verfahren, TSA und DVT, ergänzen sich. Sie sollten mit entsprechend rechtfertigender Indikation für entsprechende Fragestellungen in der Zahn-, Mund- und Kieferheilkunde aus diagnostischen und forensischen Gründen eingesetzt werden. Das CT sollte aus strahlenhygienischen Gründen nur noch bei komplexen Fragestellungen des Gesichtsschädels mit Weichteilbeteiligungen und in der Tumordiagnostik eingesetzt werden.
Keywords: Panoramaschichttechnik, digitale transversale Schichtaufnahme, digitale Volumentomographie, Radiologie des Gesichtsschädels
Purpose: Two intraoral CCD sensor systems were compared with respect to image quality and interobserver agreement.
Materials and Methods: Forty intraoral images from each of the sensors (Trophy RVG5, Sirona Sidexis) were examined by 4 observers in terms of anatomical landmarks and general image quality. The images were divided into 2 groups - filtered and unfiltered. Kappa values for interobserver agreement were calculated for all assessed points.
Results: The Trophy sensor showed better image quality in the filtered group, and the Sirona sensor demonstrated good image quality in the unfiltered group. Moderate to substantial interobserver agreement was achieved. The use of filters increased edge artefacts. Sensor specific artefacts in the Trophy system were observed.
Keywords: intraoral digital imaging, CCD sensors, RVG5 filter, edge artefacts, blooming, interobserver agreement, Kappa value
The goal of the present study was to objectify whether the design modes of "Correlation", "Function", and "Extrapolation" of the Cerec 2 system are suitable for generating a functionally perfect occlusal surface of a first mandibular molar crown. For this purpose, an occlusal surface was waxed up according to the biomechanical concept of MH Polz, and this served as the reference occlusal surface. Four different Cerec 2 comparison crowns (produced in the laboratory, Extrapolation mode, Correlation mode, Function mode) were produced and the positions of the cusps were measured. It was shown that the Correlation mode delivers the most accurate results, and the manually produced occlusal surface also showed good results. The occlusal surfaces of the crowns produced according to the Extrapolation and Function mode were clearly inferior.
Keywords: all-ceramic crown, Cerec, occlusal surface
The development of adhesive systems is briefly presented. The advantages of adhesively bonded ceramic restorations are discussed, as are the steps involved in creating an adhesive bond to ceramic.
Keywords: adhesive technique, silicate ceramic restorations
The DCS Precident system is suitable for the dental practice and enables the processing of different materials and dental structures. The surface is acquired precisely and without contact by means of a semiconductor laser. Easy-to-use software is employed for the three-dimensional design of the restorations. An almost fully automatic milling machine efficiently mills the framework. A clinical case is documented.
Keywords: DCS Precident system, zirconium oxide restorations, CAD/ CAM technology