Poster Presentation

Poster Presentation

PR76 - Effect of Simulated Intraosseous Sinusoidal Pressure on NaOCl Extrusion

Thursday, April 26
10:00 AM - 1:00 PM
Room: Exhibit Hall

Objective: To examine the effects of irrigant delivery flow rate and simulated intraosseous sinusoidal pressure on the rate of NaOCl apical extrusion from a simulated root canal (19 mm long, 30/.04). Methods: A closed-system apparatus was designed to oppose irrigant extrusion by simulating 30 mmHg of intraosseous pressure. Two groups were tested: atmospheric pressure only (control; “ATM”) and atmospheric + 30 mmHg (sinusoidal; “ATM+30”). Using five irrigant delivery rates (15.6, 8.0, 4.0, 3.4, or 3.0 mL/min) from a 30-gauge side-vented needle placed 1 mm short of working length, the extrusion rates of 2% NaOCl from the faux apex were measured in each group (n=16). Data were analyzed with two-factor ANOVA and pairwise comparisons (α= 0.05). Correlation between delivery rates and apical extrusion rates in both groups were analyzed with the Pearson product-moment procedure. Results: Irrespective of the opposing pressure, extrusion rates were positively correlated with irrigant flow rates. Significant differences in extrusion were identified among all flow rates (p<0.05), except for the pairwise comparison between 3.4 and 4.0 mL/min for ATM. For all irrigant flow rates, the extrusion rate was significantly lower at ATM+30 than that obtained at ATM (p<0.05). Further, no apical extrusion was observed at ATM+30 using a delivery rate of 3.0 mL/min. Conclusions: In the presence of a simulated 30 mmHg intraosseous pressure, an irrigation flow rate of less than 3.0 mL/min prevented NaOCl extrusion when delivered by a side-vented needle placed 1 mm short of working length.

Marcus Miller

Endodontic Resident
Dental College of Georgia at Augusta University

Graduated from the University of Minnesota School of Dentistry in 2012; general dentist in private practice for four years in Seattle, WA; now in second year of endodontic residency at the Dental College of Georgia.

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Brian Bergeron

Program Director
Georgia Regents University College of Dental Medicine

Brian E. Bergeron, DMD serves as Associate Professor and Endodontics Residency Program Director at the Dental College of Georgia at Augusta University. He received his DMD from the University of Florida and completed a General Practice Residency at Offutt AFB, NE and a Residency in Endodontics at Wilford Hall Medical Center, Lackland AFB, San Antonio, TX. He served 23 years in the USAF Dental Corps, to include his final assignment as Endodontics Residency Director for the USAF program at Keesler AFB in Biloxi, MS. He is a Diplomate of the American Board of Endodontics and a Fellow in the International College of Dentists. He serves nationally on the ADA Dental Quality Alliance, the Scientific Advisory Board for the Journal of Endodontics, and as a Review Committee member for the Commission on Dental Accreditation.

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