It is with sincerity and a humble gratitude that I acknowledge my beloved teachers
To begin with, I thank the Almighty.
I am grateful to my parents Father D.V.APPARAO, Mother D.SIVA KRISHNA KUMARI , wife Dr Gayatri and my Brother D.RAMAKRISHNA for their constant moral support and for standing by me during the period of my study.

Special thanks to my favourite teacher Dr Jitendra Sharan MDS ,PhD , PhDDE , Associate Professor AIIMS Bhubaneswar


I sincerely thank all my Friends, Batch mates, seniors, juniors, Colleagues and Non-teaching staff members for helping me directly or indirectly throughout the course.