Résumé
Objective: Furcal perforation is an undesirable complication that may occur during root canal therapy and seriously compromises the prognosis of endodontic treatment. The prognosis of furcal perforation repair depends on the prevention of bacterial infection of the perforation site. Thus, use of a biocompatible material for complete sealing of the perforation site is critically important
This study aimed to compare the micro leakage of mineral trioxide aggregate [MTA] and octaca1cium phosphate [OCP] for furcal perforation repair
Methods: This experimental study was conducted on 70 human mandibular molars with divergent roots, intact furcation site and completely formed apices. The teeth were randomly divided into 4 groups of two experimental [n=30], one positive control and one negative control group [n=5]
The furcation floor was then perforated. In the first and second experimental groups, furcation perforations were repaired with OCP and MT A, respectively. In the positive control group, the perforation was left untreated and in the negative control group no furcal perforation was created. The access cavity in all groups was filled with Cavit. The teeth were stored in 100% humidity for 48h. Root apices were sealed with sticky wax and the entire external surface of teeth except for 0.5 mm around the perforation site was covered with two coats of nail polish. The specimens were immersed in India ink for 4 days and then sectioned in half buccolingually. The sections were separated and dye penetration was evaluated using a stereomicroscope at 25X magnification. Obtained data were Janalyzed using independent t-test
Results: No micro leakage was observed in the negative control group. In the positive control group, the dye had completely penetrated into the walls. The amount of dye penetration was 1.64 and 1.22mm in the OCP and MT A groups, respectively. Statistical analysis of data revealed that the sealability of MTA was significantly greater than that ofOCP [P<0.0001]
Conclusion: OCP cannot be an acceptable alternative to MT A in terms of sealability
Résumé
The present study was aimed at investigating the awareness level about warning signs of cancer and its determinants in an Iranian general population. This cross-sectional interview-based survey investigated 2,500 people aged 18 years and over, as a representative sample of Tehran population. Latent class regression was applied for analyzing data. A small (18.8%) proportion of the respondents had high level of knowledge, and 54.5% had moderate awareness, and 26.7% had low level of awareness. Most effective predictors for awareness were educational attainment, sex, and marital status. The findings suggest that the overall level of knowledge about warning signs of cancer among the public is low, particularly about some specific signs. Accordingly, educational and intervention programmes, with special attention placed on particular at-risk populations, to increase awareness about the disease leading to its early diagnosis are needed.