Background:One of the anatomic structures in the mental interforaminal area is the mandibular incisive canal (MIC). Using various manipulation tools in the digital system may affect the visibility of MIC.Objectives:The purpose of this study was to assess the effect of inversion filter (IF) on the visibility of mandibular incisive canal in panoramic radiographs.Patients and Methods:In this cross-sectional study, 2580 digital panoramic images of 18 to 70-year-old patients were inspected for presence of MIC. Visibility of MIC and extension of the canal were registered separately on each side using IF and conventional mode. Data were analyzed by Kappa test using SPSS version 20 software. A probability value of P < 0.05 was considered statistically significant.Results:There was no significant differences between IF and conventional mode regarding visibility of MIC (P > 0.05).Conclusion:Although using IF caused improved visibility of MIC, the difference with conventional mode was not statistically different.

Introduction:Optimal radiopacity is one of the properties required for a root canal sealer that helps the distinction between the sealer and surrounding anatomic structures and evaluation of the quality of root filling. So, the purpose of this study was to evaluate the radiopacity of six root canal sealers at different focal distances. Materials and Methods:In this in vitro study, six endodontic sealers (ADSEAL, AH26, AH plus, Dorifill, MTA fillapex, and ZOE), were prepared and placed in a mold with 1mm thickness and 10mm diameter. The specimens were positioned alongside an aluminum step wedge on a digital detector (occlusal size 76×57 mm). Radiographic imaging was performed at 15 and 30cm focal distances and radiopacity of each specimen was measured.One-way ANOVA and paired t-test were used and p<0.05 was considered significant.Results: All sealers were found to be more radiopaque than 3 mm aluminum. At 15cm focal distance, the radiopacity values were 31.7, 60.68, 121.48, 52.4, 48.6, and 48.08 aluminum for ADSEAL, AH26, AH plus,Dorifill, MTA fillapex and ZOE, respectively. At 30cm focal distance, the figures were 80. 32, 153.6, 253.6, 139.92, 144.08, and 129.92 for ADSEAL, AH26, AH plus,Dorifill, MTA fillapex and ZOE, respectively. Conclusion:All of the sealers investigated in this study met the standards for minimal radiopacity. AH plus had the highest radiopacity at both focal distances. Radiopacity decreased by increasing the focal distance and the decline was statistically significant for AHplus.

High concentration of nitrate and nitrite is not enough for caries prevention.

Information about emergency drug and equipment would help to manage the unwanted emergency situations.

IntroductionOne of the biggest disadvantages of dental amalgam is that gaining its ultimate strength is a slow process. The use of a rapid-setting amalgam with high early compressive strength could be a better option in preventing early fractures in pediatric dentistry. The aim of this study was to determine the effect of diode laser irradiation on compressive strength of dental amalgam.MethodsA case-control study was performed on 180 amalgam samples made at the Tehran Dental Material Research Center in 2014. Fifteen and thirty minute compressive strength of regular setting and fast setting amalgams were measured as control. In case groups, the samples were irradiated by 810nm diode laser with power of 1 and 2 watt and in pulsed and continuous mode, and compressive strength was measured after 15 and 30 minutes. Statistical analysis was performed with SPSS 18 using one and two way ANOVA and Scheffe multiple comparisons test and p<0.05 was considered significant.ResultsNumerous kinds of laser irradiation led to a significant increase in compressive strength compared to regular setting control groups. Fifteen minutes-compressive strength of regular-setting amalgam irradiated by 2 watt laser was significantly more than fast-setting control group (p<0.05).ConclusionIrradiation by 810nm diode laser can significantly increase the compressive strength of dental amalgam especially in the first 15 minutes.