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The aim was to compare age estimation using Cameriere’s and Demirjian’s methods to chronologic age in children with mixed dentition in a rural population of Kerala. The present study comprised of 10 subjects of age range 7-12 years. Dental age was assessed using Cameriere’s and Demirjian’s methods and was compared to the chronologic age. Panoramic radiographs were used for assessment of dental age. Data were analysed using paired t-test. The mean of difference obtained was 0.92 and the pvalue was 0.172 which showed insignificant difference between the two methods. Cameriere’s method showed a positive linear correlation (0.6393) with chronologic age and was statistically significant (P=0.0171), whereas Demirjian’s method showed a negative correlation (–0.7598) and was statistically insignificant (P=0.9967). The present study indicated that Cameriere’s method is reliable for age estimation in our population and is more accurate than Demirjian’s method.

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The fast developments in power electronic technology have made it possible to mitigate voltage disturbances in power system. Among the voltage disturbances challenging the industry, the voltage sags are considered the most important problem to the sensitive loads. Dynamic voltage restorer (DVR) is a series connected power electronic based device that can quickly mitigate the voltage sags in the system and restore the load voltage to the prefault value. DVR is recognized to be the best effective solution to overcome this problem. The primary advantage of the DVR is keeping the users always on-line with high quality constant voltage maintaining the continuity of production. In this paper, the usefulness of including DVR in distribution system for the purpose of voltage sag and swell mitigation is described. The DVR presented here is based on the concept of dqo. The proposed control method is found very efficient for detecting and clearing any power quality disturbance in distribution systems. Results of simulation using MatlabSimulink are demonstrated to prove the usefulness of this scheme.