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Background: The removal of the lower impacted third molar teeth is always associated with varying degrees of inflammation that may have a social impact for the patients. To control these symptoms associated, it is necessary to provide an adequate anti-inflammatory therapy. The present study was undertaken to evaluate the therapeutic effect of pre-operative single dose of 8 mg oral Dexamethasone on pain, swelling, trismus following impacted lower third molar surgery. Materials and Methods: This study was conducted at MGPGI puducherry. Hundred patients with bilateral mandibular molar impaction were included in the study. Patient was allocated randomly as study and control group. Study group received 8 mg oral Dexamethasone one hour prior the surgical extraction. Patients with contraindication to the use of steroids were excluded from the study. Pain, facial contour and mouth opening were measured preoperatively and at 2nd and 5th days postoperatively.Results: On 2nd post-operative day, no statistically significant differences were noted in pain for both the groups. However, low pain scores were obtained with the use of Dexamethasone compare to placebo group. Dexamethasone group showed shows statistically significant reduction in swelling and trismus compared with the control group at all intervals.Conclusion: Dexamethasone 8 mg given orally one hour preoperatively is effective in minimizing pain, swelling, and trismus after removal of impacted lower third molar teeth.

Surface electrode switching of 16-electrode wireless EIT is studied using a Radio Frequency (RF) based digital data transmission technique operating with 8 channel encoder/decoder ICs. An electrode switching module is developed the analog multiplexers and switched with 8-bit parallel digital data transferred by transmitter/receiver module developed with radio frequency technology. 8-bit parallel digital data collected from the receiver module are converted to 16-bit digital data by using binary adder circuits and then used for switching the electrodes in opposite current injection protocol. 8-bit parallel digital data are generated using NI USB 6251 DAQ card in LabVIEW software and sent to the transmission module which transmits the digital data bits to the receiver end. Receiver module supplies the parallel digital bits to the binary adder circuits and adder circuit outputs are fed to the multiplexers of the electrode switching module for surface electrode switching. 1 mA, 50 kHz sinusoidal constant current is injected at the phantom boundary using opposite current injection protocol. The boundary potentials developed at the voltage electrodes are measured and studied to assess the wireless data transmission.