Die Retention zahnfarbener Wurzelkanalstifte in Abhängigkeit von verschieden Befestigungssystemen

Objectives: In this investigation, the tensile bond strength of two different post systems (CP: CeraPost, Komet, Lemgo and DP: DentinPost, Komet Lemgo) in combination with four different dual-curing resin cements was tested. Methods: Eighty freshly extracted single-rooted were included in this study. The specimens were randomly assigned to eight experimental groups of ten each. The posts were inserted into 80 artificial root canals in bovine dentin using four different dual-curing resin cements (P: Panavia F 2.0; R: RelyXUnicem; B: Bifix QM; N: Nexus 2). After cementation all teeth were stored in 0.9% saline at 37 degrees. The retentive bond strength was measured after 24 hours storage using a universal testing machine (Zwick Z005). Results: For the eight test series following tensile bond strengths were evaluated (mean values and standard deviations in N): CP/P: 290.47 (± 59.86), CP/R: 159.81 (±56.42), CP/B: 60.37 (±14.61), CP/N: 74.49 (±16.09), DP/P: 233.61 (±53.76), DP/R: 323.26 (±55.51), DP/B: 245.65 (±81.76), DP/N: 110.46 (±27.80). The statistical analysis, using ANOVA and Tuckey test at a significance level of 5 %, showed that using Panavia F 2.0 with Cerapost and RelyXUnicem with Dentinpost resulted in the significant highest bond strength values. Nexus 2 had the significant lowest tensile bond strength in both fiber post systems. Between the different types of posts significantly higher bond strengths, except Panavia F 2.0 with DentinPost, could be tetected in the glas fiber group. Conclusions: It can be concluded that all tested resin cements are basically suitable for cementation of fiber posts. The combination of dual-curing resin cements with the type of fiber post has a great influence on the tensile bond strength. Keywords: Retention, adhäsive Befestigungssysteme, Dentinadhäsive, Wurzeldentin, Glasfaserstifte