Über die Eignung von Methoden zur Entfernung von Wurzelstiften aus Faserverbundmaterialien

Abstract

Objective: Three techniques for fiber post removal have been evaluated for following qualities: Efficiency, effectiveness, removal of rootdentin, handling off instruments, failure and configuration of the root canal walls after post removal. Methods and materials: Glass fiber posts (Easy Post , Densply Maillefer), quarz fiber posts (DT White Post, VDW GmbH) and carbon fiber posts (HT Cytec Post, Hahnenkratt GmbH) were cementet (DyractCem Plus, Denply) in 153 single- rottet teeth after endodontic therapy. For fiber post removal were evaluated three methods: DT-Post-Removal-Kit (VDW), an overlong rose- head bur and a Sonic Flex Ultrasonic head (KAVO). Results: The DT-Post-Removal-Kit removed all fiber post types easiely, by low failure rates under high efficiency and accuracy. Though the removal of carbon fiber posts was relatively ineffectiv and in the group of glass fiber posts the loss of rootdentin was comparatively high. The Sonic Flex ultrasonic head could remove glass fiber posts by low failure rates. By comparison the removal off carbon fiber posts with ultrasonic was difficult, inefficient and caused in high loss off dentin, even though with low failure. The quarz fiber post removal with ultrasonic er efficient, but caused high loss off rootdentin and a high number off via falsa. Fiber post removal by a rose-head bur er effective and efficient, but produces under complicated handling off the bur high loss of dentin, a bad configuration of the rootcanal wall and especially in the groups of quarz- and glass fiber posts high failure rates. Conclusions: The DT–Post-Removal-Kit er best qualified for fiber post removal. The use off a rose-head bur for removal of root canal posts can not be adviced due to bad results. Method- characteristics some effectivity and efficiency can not be seen by themselves, but must be seen in comparision with other charactaristics, with evtl. endanger treatment success such as the loss of rootdentin and failure rates some via falsa and perforations.