Apikale Dichtigkeit von Wurzelkanalfüllungen mit Soft-Core und Thermafil bei Aufbereitung mit rotierenden Instrumenten

Im Jahr 1978 beschrieb Johnson eine Technik, mit der thermisch plastifizierte Guttapercha mittels eines flexiblen Metallträgers in den vollständig aufbereiteten Wurzelkanal eingebracht wurde. Diese Technik versprach eine sichere Obturation des Wurzelkanalsystems, ohne vertikale Kondensation [12]. Sie wurde als Thermafil-System (Dentsply Tulsa Dental, Oklahoma, USA) in die Praxis eingeführt.

Auf dem gleichen Prinzip beruht ein neueres Verfahren: das Soft-Core-System (Soft Core Dental Production ApS, Copenhagen, Denmark) [14].

Es besteht aus einem Trägerstift auf Polymerbasis, der im koronalen Drittel hohl ist und innen über einen Metallpin mit einem Plastikgriff verbunden ist. Auf diese Art und Weise kann der Träger adjustiert und an die jeweilige Arbeitslänge angepasst werden, indem der Metallpin teilweise herausgezogen wird.

The aim of this comparative study was to evaluate the influence of different parameters on the apical sealing ability of this filling technique. Tested were the influence of root canal morphology of mandibular molars, the influence of four various systems of rotary nickel-titanium endodontic instruments and the influence of a root canal sealer on the results of sealing with dye penetration. 126 curved canals from 42 roots of extracted human mandibular molars were instrumented by different NiTi-files. The examinations were made with an evaluation of dye penetration on cleared teeth.

With regards to dye penetration the morphology of root canals didn't had any influence on the results, there was no significant difference for sealing ability. The use of a root canal sealer showed significantly less linear leakage for all groups. The lowest values of dye penetration have been measured in root canals of the GT-Rotary-group followed by the group of ProTaper and FlexMaster. The highest mean linear penetration of dye showed the group of Mity-Roto-files with the worst apical seal. On the whole, the root canals that have been instrumented with higher conicities were related to better endodontic fillings with less dye penetration and there could be found a statistical correlation.

Schlüsselwörter

Endodontie - Wurzelkanalaufbereitung - Wurzelkanalfüllung - Soft-Core

Key Words

Endodontics - Root Canal - Instrumentation - Obturation - Soft-Core

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