Bondability of Resilon™ to a Root Canal Sealant

Objectives: This research was to test the bondability of Resilon™ root-canal-filling material (Pentron, CT) to a resin-based root canal sealant. Gutta-percha (Endodent, CA) was used as control. Method: Four groups of sample disks of 15 mm in diameter were made with 5 samples per group, by melting the test materials in a steel ring and then mounted the solidified disks with a cold-cured acrylic, leaving one side of the disk exposed. A two-component dual-curable FiberFill RCS (Pentron, CT) was used to bond directly to the exposed sample surfaces utilizing #5 gelatin capsules to load the sealant under 500 gram load on a Bencor testing device (Denville Engineering, CA). Goup1: Resilon with the sealant, self-cure only; Group 2: Resilon with the sealant with initial light cure for 40 seconds towards the disk surface in a 45 degree angle; Group 3 and 4 : gutta-percha with the sealant without or with the initial light curing.  After one hour of bench setting, the bonded samples were transferred to a 100% humidity environment at 37^oC for 24 hours before a push shear bonding test with the Bencor test device under a crosshead speed of 0.02 in/minute. The maximum loads at which the sealant cylinders broke from the samples were recorded and the bond strengths calculated. The debonded interfaces were also observed visually. Results: The results listed in table below.