| Perforations occurring during post placement are problematic. Mineral trioxide aggregate (MTA) is slow to set. A trial demonstrated that CaCl2 accelerated the set of Portland cement. Forty single-rooted teeth were sectioned, treated with endodontic therapy and post prepared. The first group contained 20 teeth, evaluated at 72 hours. MTA, Portland cement with 10% CaCl2, 15% CaCl2 and zinc phosphate were used as post cements. The second group was evaluated at 28 days. The posts were cemented with either MTA or zinc phosphate. Instron mechanical testing was used to determine forces needed for post dislodgement. The 72 hour group showed statistically significant higher resistance to dislodgement with zinc phosphate. (p<.05) No significance was found between resistance in the experimental groups. The 28 day group posts seated with zinc phosphate had a higher resistance to dislodgement than those with MTA. (p<.05) At 28 days, MTA was found to be 28 % weaker than zinc phosphate. |
