This book is about the current controversies in dentistry, the implementation of a dental health care delivery that utilizes expanded duty personnel. The field of dental hygiene and dental technology represents the actual beginning of the delegation of expanded duties in dentistry. In the dental profession one of the most promising means of meeting the current patient demand for care, preparing for the future ,and relieving over worked doctors has been the inception of the physician assistant, nurse practitioner ,and nurse anesthetist programs and all expended duty delivery systems.

Rahul Gupta, Formerly Lecturer of Physics, Department of Applied Sciences, Yogananda College of Engineering and Technology, Jammu, IndiaRohit Gupta, Lecturer of Physics, Department of Applied Sciences, Yogananda College of Engineering and Technology, Jammu, IndiaDinesh Verma, Professor, Department of Mathematics, NIILM University, Kaithal, India