Journal of Dental Medicine

Dentists and dental professional are constantly in contact with round, sharp, hot, and rotating instruments such as burs, scalpel blades, files, etc., in daily practice. Gate Glidden is one of the mentioned instruments used for removing gutta percha from root canal- treated teeth. In this article, a rare case of penetration of a fractured Gate Gildden bur into a dentist's elbow is reported and precaution instructions are discussed.

Background and Aim: An important criterion for success assessment of implant-supported prostheses is marginal fit. Vertical and horizontal discrepancy can result in loosening of the prosthetic screw, crestal bone resorption, peri-implantitis and loss of osseointegration. Despite careful attention to waxing, investing, and casting, marginal discrepancies are inevitable. The aim of this study was to evaluate the marginal gap and overhang in three casting methods with two different alloys in ITI implants.

Materials and Methods: In this experimental in vitro study 48 analog abutments were randomly divided into six groups as follows: 1) burn out cap + BegoStar, 2) impression cap + BegoStar, 3) conventional wax up + BegoStar, 4) burn out cap + Verabond2, 5) impression cap + Verabond2, 6) conventional wax up + Verabond2. Waxing was done in 0.7 mm thickness verified by a digital gauge and a putty index was made for all groups. Reamer was used for correction of the finish line after casting in all groups. Castings were seated on analog abutments and embedded in acrylic resin. Specimens were sectioned by isomet instrument and polished and cleaned by ultrasonic cleaner for 10 min. The marginal gap and overextended margins of castings were examined under a  Scanning Electron Microscope (SEM) (X200). The mean gap and margin overextension were calculated for each group. Data were analyzed by multivariate analysis and Bonferroni post-hoc test with p<0.05 as the level of significance.

Results: No significant difference in gap size was observed among the three casting methods with two alloys (P=0.056). The marginal gap was not different in the studied casting methods (P=0.092). Gold alloy crowns showed lower marginal gaps compared to base metal alloy crowns (P<0.001). No significant difference in overhang size was observed among casting methods with two alloys (P=0.093). Base metal alloy crowns showed less overhang compared to gold alloy crowns (P<0.001). There was a significant correlation between overhang and use of impression cap in base metal alloys (P<0.001).

Conclusion: Based on the results of this study, vertical discrepancy of frameworks made with gold alloy were less than those made with base metal alloy. Base metal alloy demonstrated less overhang. Conventional wax up or using burn out caps produced less horizontal discrepancy.

Background and Aims: Occupational burnout is a psychological syndrome resulting from continuous tensions which causes absence, conflict, job changing, etc. In spite of much effort done in optimizing the work conditions and satisfying the employed persons, the dentists still suffer from this incident. The purpose of this study was to determine the degree of occupational burnout in Birjand dentists and to provide an approach.
Materials and Methods: In this descriptive-analytical study by the census method, 38 dentists were investigated using Maslach questionnaire. Average values were compared with chi-square and comparison among the groups was performed by Tukey test using SPSS software. P≤0.05 was considered as the level of significance.
Results: In this study, there were 68.4% men and 31.6% women with average age of 37.9 ±7.6 years and average work experience of 12.5±7.3 years, 15.8% single and 84.2% married. Frequency of exhaustion, intense depersonalization, and intense feeling of being unsuccessful was 21.1%, 81.6%, and 100%, respectively. There were no significant differences between occupation burnout dimensions and the other variable, such as gender, sports, marital status, and workday hours (P>0.05).
Conclusion: Protection of this stratum, providing educational programs and creating job variations are necessary for optimizing the work environment. Future studies with more sample size are suggested to determine the effect of factors.