IADR Abstract Archives
Bundled Glass Fibre Posts - Comparative Study on Bond Strength
Objectives: The aim of this study was to evaluate the effects of application mode and number of fibres on bond strengths to root dentine and homogeneity of the luting resin in comparison to a conventional solid fibre post.
Methods: 104 upper human incisors were divided into eight groups (n=13) and endodontically treated. The post space preparations were performed with the Ø 1,5mm drill from the RebildaPost System (VOCO).
Rebilda-GT Posts (VOCO) of 6 and 12 fibres were adhesively luted using Rebilda DC and the multimode adhesive Futurabond U (VOCO) with the following application methods: 1. Direct; 2. Spreader; 3.Ultrasound. Conventional glass-fibre posts were inserted as control groups (RebildaPost black, VOCO; DentinPost yellow, KOMET).
The roots were sectioned into six 1mm thick slices and measured by microscopic analysis (VHX 5000; Keyence Deutschland). Push-out tests were performed to determine the bond strengths within the root canal; from each specimen three slices within the first 48 hours and three after thermocycling and 6 months storage.
Results: The bond strengths (MW±SA) were significantly influenced (Repeated Measurement ANOVA) by the type of glass-fibre post (p<0.001) and not by thermocycling or storage. The DentinPost group showed significantly lower bond strength values (8.7±3.02MPa). For the RebildaPost Systems comparable bond strength values were calculated (from 13.08±4.12 to 14.64±4.65 MPa), indicating no influence for the number of glass-fibres and method of application. The bundled glass-fiber posts showed voids inside the luting resin in 33-41% of the specimens, regardless of the number of fibres and method of application. Inhomogeneities were observed in 23% of the specimens restored with conventional fibre posts.
Conclusions: Bundled glass-fibre posts showed similar bond strengths to conventional glass-fibre posts without considerable influence for the method of application.
Regardless of the system and number of glass-fibres various inhomogeneities were noticed within the luting resin.
Methods: 104 upper human incisors were divided into eight groups (n=13) and endodontically treated. The post space preparations were performed with the Ø 1,5mm drill from the RebildaPost System (VOCO).
Rebilda-GT Posts (VOCO) of 6 and 12 fibres were adhesively luted using Rebilda DC and the multimode adhesive Futurabond U (VOCO) with the following application methods: 1. Direct; 2. Spreader; 3.Ultrasound. Conventional glass-fibre posts were inserted as control groups (RebildaPost black, VOCO; DentinPost yellow, KOMET).
The roots were sectioned into six 1mm thick slices and measured by microscopic analysis (VHX 5000; Keyence Deutschland). Push-out tests were performed to determine the bond strengths within the root canal; from each specimen three slices within the first 48 hours and three after thermocycling and 6 months storage.
Results: The bond strengths (MW±SA) were significantly influenced (Repeated Measurement ANOVA) by the type of glass-fibre post (p<0.001) and not by thermocycling or storage. The DentinPost group showed significantly lower bond strength values (8.7±3.02MPa). For the RebildaPost Systems comparable bond strength values were calculated (from 13.08±4.12 to 14.64±4.65 MPa), indicating no influence for the number of glass-fibres and method of application. The bundled glass-fiber posts showed voids inside the luting resin in 33-41% of the specimens, regardless of the number of fibres and method of application. Inhomogeneities were observed in 23% of the specimens restored with conventional fibre posts.
Conclusions: Bundled glass-fibre posts showed similar bond strengths to conventional glass-fibre posts without considerable influence for the method of application.
Regardless of the system and number of glass-fibres various inhomogeneities were noticed within the luting resin.