title: Microleakage of IRM used to restore endodontic access preparations.
abstract: The effect on microleakage of varying the powder-to-liquid ratio (P/L) of IRM used to restore endodontic access preparations was evaluated. Crowns of noncarious, nonrestored extracted human teeth were used in this study. Microleakage was measured using a fluid filtration technique prior to access preparation to obtain control measurements. After access preparation, IRM restorations were placed using P/L of 2, 3, 4, 5, and 6 g/ml, using the manufacturer's recommended dispensing scoop and dropper, and using 2 P/L in a new capsulated IRM delivery system (IRM CAPS). Microleakage measurements were made after various time intervals and after thermal stress. The results indicated that the lower P/L provided the best seals. All groups demonstrated significant microleakage measurements after thermal stress. Significantly greater microleakage measurements were obtained with the P/L of 6 g/ml and the manufacturer's recommended dispensing scoop and dropper. A P/L of 2 g/ml demonstrated less microleakage than the other groups tested.
authors: Medical College of Georgia, School of Dentistry, Augusta.
authors: R W
authors: RW
authors: Anderson
authors: B J
authors: BJ
authors: Powell
authors: D H
authors: DH
authors: Pashley
mesh_terms: D003763:Dental Leakage; D003794:Dental Restoration, Temporary; D005374:Filtration; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D012390:Root Canal Therapy; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D015035:Zinc Oxide-Eugenol Cement