Comparing the amount of removed dentin thickness in root canal treated primary molar teeth using different instrumentation techniques: in-vitro study using CBCT.

PURPOSE: There is a clinical dilemma about root canal preparation for endodontic treatment of primary teeth. This study aimed to compare the amount of dentin removal in root canal treated primary molar teeth with three preparation techniques by cone-beam computed tomography (CBCT). METHODS: A total of 39 s primary molar teeth were selected with a minimum of two-thirds of the entire root length. Access cavity was prepared and preliminary CBCT images were taken and viewed by Romexis programme. The wall thickness of the canal was measured in the danger zone at two axial cut sections of 1 and 2 mm below furcation. Then, the teeth were instrumented with three different methods as manual K-files (size 15-30), Gates glidden burs (in decreasing order of size #2 and #1 followed by hand k-files up to file number 25), and ProTaper rotary files. After canal preparation, the specimens were placed in the same position, and the canal wall thickness was remeasured. Data were analysed by using one-way ANOVA and Kruskal-Wallis tests (α = 0.05). RESULTS: The amounts of removed dentin thickness was not significantly different among the three groups at two axial cut sections of 1 mm and 2 mm below furcation (P = 0.27 and 0.17, respectively). CONCLUSION: Within the limitations of this study, the three instrumentation techniques used in primary molars were comparable regarding the amount of dentin removal.

Investigation of the awareness of the students of shiraz dental school concerning the patients' rights and the principles of ethics in dentistry.

STATEMENT OF PROBLEM: Deliberating the patients' rights is one of the major human ethical and legal principles which can be investigated through the agenda of professional and medical ethics.accordingly , the students of dentistry have to be educated about this issue and achieve the necessary skills in deliberating and concerning the patients' rights. PURPOSE: The present study aimed to investigate Shiraz dental students' awareness and attitude regarding the patients' rights as well as the principles of dental ethics in order to design methods for organizing and improving the ethics in dentistry. MATERIALS AND METHOD: The present descriptive-analytical study was conducted on 111 students of different departments of Shiraz Dental School. The study data were collected through a questionnaire designed based on the patients' rights charter in Iran, ADA ethical codes which are internationally acceptable in the field of dentistry, and the guidelines of the ministry of health, treatment, and medical education (No. 140588). Then, the data were entered into the SPSS statistical software and analyzed. RESULTS: Of all participants, 21.6% were men and 78.4% were women. According to the results, 71% of the students were acquainted with the patients' rights. In addition, the patients' characteristics, including gender and nationality, were not important for 58.6% of the students. CONCLUSION: The study findings showed that 71% of the participants were acquainted with the patients' rights Establishment of a comprehensive, integrated charter in Iran is needed. With rapid development of medical sciences, new issues appear which necessitate taking into account the mutual rights of the physicians, people, and patients.