Introduction: Aim of this study was to evaluate the effective of premedication and to determine the difference between non steroidal anti-inflammatory drugs and centrally acting opioids like tramadol on success rate of inferior alveolar nerve block in patients with asymptomatic irreversible pulpitis. Methods: This double blind clinical study was conducted on 60 patients with asymptomatic irreversible pulpitis in first or second mandibular molar with normal periapical radiographic findings. Three medications i.e., ibuprofen (600mg), tramadol (50 mg) and combination of ibuprofen (400 mg) + acetaminophen (325) were compared and lactose powder capsules were taken as placebo. All patients received IANB and teeth were examined with a cold pulp test using endofrost. Then, endodontic access cavity preparation was initiated. In case of pain during treatment, patients were asked to rate their pain on the visual analog scale. Results: The tramadol group showed significantly higher success rates but ibuprofen and combination of ibuprofen and acetaminophen groups were not significant with placebo (p>05). No Significant differences were there regarding sex of the patients. Conclusion: Premedication with tramadol increased the success rate of IANB.

No abstract

No abstract

No abstract

In the present paper, we deal with the effect of G-jitter (time periodic gravity modulation) on the stability of double diffusive convection in couple stress liquid by method of nonlinear analysis. The infinitesimal disturbances are expanded in terms of power series of amplitude of modulation. Couple stress term has been employed in momentum equation. For the stationary convection, the Ginzburg-Landau equation has been used to investigate the effect of modulation on heat and mass transfer. The effect of Prandtl number, couple stress parameter, Lewis number and solute Rayleigh number has also been investigated. Ó 2016 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).