Journal of Dental Medicine

Postoperative pain following Root Canal Therapy (RCT) is the common problem for patients,dentist and dental staff. Regardless of cause it appears that postoperative pain and discomfort is related to periapical inflammation. The purpose of this study was to investigate histologically the effect of Ibuprofen on acute apical inflammation following RCT. on cat. Fifty-six cuspids teeth of 14 cats were divided into three groups, 6 cats for experimental group, 6 cats for positive control group and 2 cats for negative control group. In first group, to anesthesize the animals each cat received 10 mg/kg Ibuprofen 36 hours before RCT and repeated every 24 hours. In second group RCT was performed in 24 cat teeth without any prescription. In negative control groups 2 cats, no RCT were done.Following vital perfusion, in interval of 6, 12, 24 hours, samples were post fixed in 10% formalin and five micron sections were prepared, and stained with H&E and studied under the Mann Whitney parameter test. Infilteration of inflamatory cells in 6 hours interval in experimental group was significantly less than two control groups. In 12 hours samples, however, inflammation in experimental group reduced, but it was not significant. In 24 hours samples there was no significant difference between experimental groups and controls. The result of this in-vivo study shows prescription of Ibuprofen before root canal therapy can reduce inflammatory reaction.

Background and Aims: Discoloration of resin composites is considered to be the major factor in esthetic restoration failures. The aim of this study was to evaluate the color stability of resin composites after rebonding with two different adhesive materials.

Materials and Methods: Forty five composite disc samples were divided into three groups (n=15). The surface of specimens was finished by polishing disc and rubber. In group 1, any additional phase was not performed. In group 2, composite discs were etched by %37 orthophosphoric acid, then Margin- bond was used for rebonding. In group 3, the etching procedure was in the same manner used for group 2, but Permaseal was used after etching. After the first phase of spectrophotometric measurement, the specimens were dipped in coffee mix for 3 weeks for aging the specimens. Then the second phase of spectrophotometric evaluation was performed. Collected data was analyzed using one-way ANOVA test followed by Tukey test. P<0.05 was considered as the level of significance.

Results: The mean total color difference (∆E) observed in groups 1 to 3 were 1.4±0.34, 5.24±1.51, and 7.44±1.34, respectively. Statistical significant differences were shown between the groups (P<0.001).

Conclusion: Rebonding with adhesive materials used in this study did not increase the color stability of composite restorations.