With the advancements in technology more & more artificial metals, alloys and other implantable and non implantable materials are being used in the fields of medicine and dentistry. These materials directly or indirectly come in contact with skin, epithelium, connective tissue or bone. Given this long term intimate contact with vital tissues, it is paramount that alloy biocompatibility be investigated and understood. Moreover the oral and maxillofacial environment is complex and varied with different requirement and biocompatibility issues depending on the specific use. Unfortunately in our educational curriculums these important issues are not thoroughly understood, investigated or taught. In this book authors have made an utmost effort to make readers get a fair idea about these important issues and discuss the recent researches in this field. This will surely be a very useful piece of work for the medical and dental students, practitioners, assistants, technicians, manufacturer and many others who directly or indirectly come in contact with these materials.