IADR Abstract Archives
Bond Strength of Post and Core Build-up Systems
Objectives: Evaluate the effect of macro-retentions in the coronal part of endodontic posts by testing the combination of new bulkfill resin-composite Filtek™ Bulk Fill Posterior (FBP) bonded with Scotchbond™ Universal (SBU) to an experimental fiber-reinforced-composite post (Exp-FP) design with retention elements (w/-R). For comparison a design without retentions (RelyX™ Fiber Post - w/o-R) was used (all materials from 3M ESPE Dental). Moreover, the handling of Exp-FP was assessed by dentists in an in-office test.
Methods: For the bonding test specially shaped samples were manufactured, with geometries representing the two types of coronal design. The w/-R type reflected the coronal geometry of Exp-FP (Size 3) and w/o-R exactly the coronal geometry of RelyX Fiber Post (Size 3). Bonding surface was treated with SBU. Cylindrical species of FBP around the posts were made (Ø = 5.6 mm, height = 9.8 mm). Cylinder and top-surface were light-cured (LC) for 20s (Elipar™ S10, n=10/group), bond strength tested using a pull-off test method (speed: 1mm/min) and results statistically analysed using the non-parametric Mood Median Test (p<0.05).
Results: Median bond strength values are summarized below. Groups with no statistically significant difference are marked with the same letter.
The bond strength was significantly higher for the samples with retentions compared to that without retentions.
Quantified responses from dentists regarding the handling of Exp-FP indicated high satisfaction level. Dentists appreciated the macro-retentions allow for an immediate depth control and a safe grip with tweezers. FBP can be placed virtually void free around the macro-retentions.
Conclusions: Overall, both coronal designs showed high bond strength values. Nevertheless, the significantly higher values for samples with macro-retentions might be advantageous for a reliable clinical outcome.
In a clinical environment the handling of the post and core build-up system Exp-FP/SBU/FBP is highly accepted by dentists.
Methods: For the bonding test specially shaped samples were manufactured, with geometries representing the two types of coronal design. The w/-R type reflected the coronal geometry of Exp-FP (Size 3) and w/o-R exactly the coronal geometry of RelyX Fiber Post (Size 3). Bonding surface was treated with SBU. Cylindrical species of FBP around the posts were made (Ø = 5.6 mm, height = 9.8 mm). Cylinder and top-surface were light-cured (LC) for 20s (Elipar™ S10, n=10/group), bond strength tested using a pull-off test method (speed: 1mm/min) and results statistically analysed using the non-parametric Mood Median Test (p<0.05).
Results: Median bond strength values are summarized below. Groups with no statistically significant difference are marked with the same letter.
The bond strength was significantly higher for the samples with retentions compared to that without retentions.
Quantified responses from dentists regarding the handling of Exp-FP indicated high satisfaction level. Dentists appreciated the macro-retentions allow for an immediate depth control and a safe grip with tweezers. FBP can be placed virtually void free around the macro-retentions.
Conclusions: Overall, both coronal designs showed high bond strength values. Nevertheless, the significantly higher values for samples with macro-retentions might be advantageous for a reliable clinical outcome.
In a clinical environment the handling of the post and core build-up system Exp-FP/SBU/FBP is highly accepted by dentists.