ABSTRACT
This study investigated the possibility of re-treating a calcium silicate-based sealer (CSBS), compared to an epoxy-resin sealer (RBS), using rotary instrumentation at different times from obturation (1 month/1 year). Thirty-six human mandibular premolars, extracted as a result of orthodontic or periodontal problems, were instrumented and randomly divided into three groups of 12: BR and BR*, which were filled with CSBS and re-treated after one month and one year of storage, respectively, and AH, which was filled with RBS and re-treated after one month. The same re-treatment protocol was used for all teeth, and the times required for the procedure was recorded. The re-treated specimens were longitudinally sectioned and examined at the stereomicroscope (SM) at 20× magnification. Image J Software was used to process the microphotographs. The percentage of residual filling materials in the root canal and the apical third, the ability to reach working length WL and patency, and the time taken to complete the re-treatment were recorded and analyzed by ANOVA and post hoc Bonferroni test (p = 0.05). Scanning electron microscopy (SEM) and coupled energy-dispersive spectroscopy (EDS) were applied to representative samples to evaluate canal cleanliness and chemical elements. Patency and WL were re-established in all of the teeth. Residual filling materials were retained in all specimens of the three groups. The mean percentage of residual materials was significantly different between BR and BR* (p-value = 0.048), with BR* showing the highest values. The mean time to complete re-treatment was significantly lower for AH, followed by BR (p = 0.0001) and BR* (p = 0.0078). Conclusions: After both medium and long storage periods, the CSBS can be concluded to have been successfully removed from canals with simple anatomy.
ABSTRACT
AIMS: The study aimed to evaluate prevalence rates of victimization in a sample of outpatients affected by psychotic or anxiety disorder. METHODS: After informed consent 101 patients (50 affected by psychotic disorders and 51 affected by anxiety disorders according to DSM-IV TR) and a control group of non affected people matched according to gender, age, marital status and education were included in the study. Psychotic patients were submitted to evaluation by means of PANNS; control group was submitted to the MINI interview. All subjects (cases and controls) fulfilled a 14-item Victimization Questionnaire. RESULTS: Subjects affected by mental disorders reported more frequently physical aggressions (6% vs. 1% of controls, p = 0.054), contact with police for help (22.8% vs. 5% of controls, p < 0.0001), insults or offences (39.6% vs. 18.8% of controls, p = 0.001), disturbing phone-calls (19.8% vs 8.9% of controls, p = 0.027), stalking (5.9% vs. 1% of controls p = 0.054). during the last 12 months. Subjects with anxiety disorders reported victimization more frequently than psychotic patients. The comparison of the data collected in the present study with those from international literature show lower rates of victimization in our sample. CONCLUSIONS: People affected by mental illness, particularly non psychotic patients, seem to be more frequently submitted to some forms of violent and non violent victimization.
