Caspian Journal of Dental Research

Introduction: This study aimed to evaluate and compare the apical sealing ability of different irrigation regimens (NaOCl, CHX, NS, and MTAD) .

Methods: Seventy intact extracted single-rooted human teeth were selected. The roots were resected at 3 mm short of the apical foramen after access preparation. The canals were prepared with profile. This rotary file moved forward into the apical foramen so that the D16 section of the file passed the foramen of the resected part of the root. The teeth were randomly divided into 4 study groups. After placing them in humid sponge, the canals were irrigated with study irrigators for 5 minutes. The canals were dried and 5mm MTA was placed into the apex. After 24 hours, the teeth were placed indian ink solution. The teeth were cleaned and the microleakage was tested using stereomicroscope.

Results: The results showed no significant difference between the group of 2% Chlorhexidine and the other groups. 0.5% Naocl group showed significantly less leakage than MTAD and normal saline groups.

 Conclusions: The results of this study suggested that 0.5% NaOCl provided the best final irrigation before the apical placement of MTA.

Introduction: In direct pup capping, the exposed pulp is directly capped with a capping material to provoke a dentinal bridge formation to seal the exposed area.The aim of this study was to evaluate the pulpal response to MTA and capsaicin in cats.

Methods: The sample for this experimental study consisted of 24 canines of cats, weighed approximately 3-4kg. After sedation, the teeth were cut and exposed at 3mm above cementoenamel junction, then divided into two groups: 1) direct pulp capping with MTA 2) direct pulp capping with Capsaicin. The cavities were filled with glass ionomer cement (Fuji IX). The cats were sacrificed in the first, second, and fourth weeks 4 canine teeth were extracted for the purpose of histologic analysis. 6Serial sections were cut parallel to the longitudinal axis of the canines. The sections were stained with hematoxylin & eosin, and were observed and analyzed using a light microscope.

Results: In both groups treated with MTA and capsaicin, the inflammation decreased during weeks1, 2, and 4. Less inflammation was seen in MTA group but there was no statistical difference between the two groups (p=0.22). In the group treated with capsaicin, necrosis was observed in every 12 samples, but in the other group treated with MTA, only 1 pulp necrosis was seen in the first week (p=0.000). There was no significant difference in dentinal barrier formation, inflammatory response, and soft tissue changes between the two groups.

Conclusions: The results of this study showed that capsaicin can decrease the severity of inflammation, but it is ineffective in dentinal barrier formation.