IADR Abstract Archives
Effect of Particle Size on Properties of a Bioceramic Sealer
Objectives: Evaluate if an existing Bioceramic sealer, BioRoot ® (Septodont, Saint-Maur-des-Fossés, France) could be modified to improve canal obturation, setting-time, dye-penetration, film-thickness, and flow.
Methods: Similarly-sized, single-rooted human maxillary anteriors and premolars were extracted and collected from patients in a dental clinic after their informed consent was obtained. All teeth were preserved using 75:25 5% sodium hypochlorite solution for up to 12 hours after extraction. Only single-rooted, single-canal teeth with oval canals were included. The BioRoot ® was modified using a FlackTek speedmixer™ (FlackTek, Landrum, SC). 6 grams of 3mm diameter zirconium silicate beads were mixed with 3 grams of BioRoot powder in a 10 gram flask. The flask was then loaded into the speedmixer ™ and milled for 40 seconds, 60 seconds, 120 seconds, and 240 seconds at 1000 rpm. In total 30 teeth were decoronated, cleaned and shaped using conventional standards and obturated using the hydraulic condensation technique, single cone backfill, and sealer. An SEM (Hitachi, Tokyo, Japan) analysis was performed to assess tubule penetration, and ISO6876:2012 were used to evaluate the mechanical properties of the modified sealer groups.
Results: The coronal, middle and apical thirds of the three teeth were imaged and examined. The modified sealers appeared to have increased penetration into the tubules up to the samples milled for 1 minute, the samples milled for longer showed no improvement in obturation. The dye-penetration, film thickness, and setting time improved for all groups with the samples milled for 4 minutes showing the most marked increase in dye-penetration and flow and a decrease in film thickness and setting time.
Conclusions: Based on the mechanical tests, decreasing the particle size of the BioRoot ® BC sealer improves its properties.
Methods: Similarly-sized, single-rooted human maxillary anteriors and premolars were extracted and collected from patients in a dental clinic after their informed consent was obtained. All teeth were preserved using 75:25 5% sodium hypochlorite solution for up to 12 hours after extraction. Only single-rooted, single-canal teeth with oval canals were included. The BioRoot ® was modified using a FlackTek speedmixer™ (FlackTek, Landrum, SC). 6 grams of 3mm diameter zirconium silicate beads were mixed with 3 grams of BioRoot powder in a 10 gram flask. The flask was then loaded into the speedmixer ™ and milled for 40 seconds, 60 seconds, 120 seconds, and 240 seconds at 1000 rpm. In total 30 teeth were decoronated, cleaned and shaped using conventional standards and obturated using the hydraulic condensation technique, single cone backfill, and sealer. An SEM (Hitachi, Tokyo, Japan) analysis was performed to assess tubule penetration, and ISO6876:2012 were used to evaluate the mechanical properties of the modified sealer groups.
Results: The coronal, middle and apical thirds of the three teeth were imaged and examined. The modified sealers appeared to have increased penetration into the tubules up to the samples milled for 1 minute, the samples milled for longer showed no improvement in obturation. The dye-penetration, film thickness, and setting time improved for all groups with the samples milled for 4 minutes showing the most marked increase in dye-penetration and flow and a decrease in film thickness and setting time.
Conclusions: Based on the mechanical tests, decreasing the particle size of the BioRoot ® BC sealer improves its properties.