I am sure the dental graduates preparing for their PG entrance exams will benefit from this book. The authors/editor has taken care to ensure that the information given in this book is accurate and up-to-date. But in every work, there can be human errors and therefore I request the reader to refer to the standard textbooks and other resources in the respective subjects in case of any doubts for clarifications. Let me take this opportunity to thank all the academicians and colleagues who have spent their valuable time towards the success of this book. Without their contribution, this work would not have materialized.