PubMed ID (PMID): 19119545Pages 81-106, Language: English, GermanHugger, Alfons / Hugger, S. / Schindler, H. J.
Auf der Basis einer fundierten klinischen Befunderhebung und unter Berücksichtigung spezieller methodischer Empfehlungen ermöglicht die Oberflächen-Elektromyographie (EMG) die Ermittlung valider und reliabler quantitativer Daten zum Funktionszustand der Kiefermuskulatur im Sinne einer "neuromuskulären Funktionsanalyse". Aufbauend auf einer aktuellen Literaturübersicht erscheint die Oberflächen-EMG in der Lage, zusätzliche diagnose- und therapierelevante Informationen zu liefern. Aussagekräftige EMG-Daten können im Zusammenhang mit den Parametern Ruheaktivität, maximale Muskelaktivierung, Frequenzspektrum bei anhaltender Belastung und Symmetrie des Kontraktionsverhaltens beider Kieferseiten gewonnen werden. Mit diesen Parametern - um kinematische Informationen zu Unterkieferbewegungen vervollständigt - scheint es unter klinischen Bedingungen praktikabel möglich, die Funktionsfähigkeit von Restaurationen beim Kauvorgang aus der neuromuskulären Perspektive zu beurteilen, den Einfluss von Schmerzen auf das neuromuskuläre System zu erfassen und die individuelle Wirkung funktionstherapeutischer Maßnahmen verlaufsbezogen zu dokumentieren.
Keywords: Elektromyographie, Kauen, Kaumuskulatur, Fatigue, orofazialer Schmerz, Schmerz-Adaptationsmodell, maximale voluntäre Kontraktion, Symmetrie, Reliabilität, Ruheaktivität
PubMed ID (PMID): 19119546Pages 107-114, Language: English, GermanBrüllmann, D. / Witzel, V. / Willershausen, B. / d'Hoedt, B.
This article discusses basic concepts of noise suppression for digital radiographs, and shows how false application of algorithms available can lead to a loss of information. Noise suppression realized with low pass convolution filters are designed to decrease strong grey level changes of neighboring pixels. Sixty-two extracted fully intact premolars were selected and treated using the crown-down technique to prepare them for experimental fractures. A total of 358 radiographs were taken, of which 312 images were selected with clearly visible root fractures. The selected radiographs were stored as uncompressed images and manipulated with 8 different convolution filters. A total of 2496 raw and filtered images were inspected for visible root fractures. Only the arithmetic mean filter with 5 x 5 kernel size led to a deletion of the visible fracture line in 33.3% of the inspected cases. The other filters proved to be useful for noise reduction without loss of any necessary diagnostic information. None of the filters improved the diagnostic outcome in the 46 remaining radiographs which did not show clearly visible root fractures before application of the filters.
Keywords: digital noise filters, root fractures, direct digital radiographs
PubMed ID (PMID): 19119547Pages 115-130, Language: English, GermanBär, C. / Reich, S.
The provision of patients with removable partial dentures on all-ceramic primary crowns with electroplated gold secondary parts is described as an alternative worthy of consideration in dental journals, lectures and in further training courses. The mode of operation is based on a precise, frictionless, passive fit between female and male components. To guarantee this even over large spans, intraoral joining of the individual components is necessary. However, this requires a different sequence of the treatment steps. The different procedures (conventional, procedure by Weigl, modified concept) are described in the following article. Clinical considerations, design principles, and special characteristics involved in producing the partial denture are explained.
Keywords: all-ceramic primary parts, sequence of procedures, intraoral cementing, telescopic prosthetics, double crowns
PubMed ID (PMID): 19119548Pages 131-138, Language: English, GermanStas, Y.
This paper describes a special case in which Cerec 3 chair-side could successfully replace a congenitally missing lat-eral incisor using a cantilever approach. The patient wasin her mid-thirties and well motivated towards the fullceramic treatment. The waxed-up model along with thesoftware yielded a creative Cerec-produced cantileverbridge across tooth 12 and attached to tooth 13. Sur-prisingly, the veneer on the canine could support a can-tilever (on the lateral incisor) with very good performanceto date (over 1 year).
Keywords: CAD/CAM, Cerec, cantilever, veneers, anterior teeth, correlation