The subject of cystic odontomas has not received in this country the same study that it has in England, Germany and France. The importance of the subject is readily appreciated when one considers the marked deformities of the face and jaws that accompany these growths, which early diagnosis and thorough operation might have eliminated in many cases.
Cystic odontomas will be considered under two classes—the simple cysts and the adamantinomas. The simple cysts are again divided into two types: Type A, including the cysts commonly called dental or root cysts, and Type B, those usually called follicular cysts and containing a partially formed tooth. The term "follicular" cyst used for the second type is misleading in that one takes for granted, without knowing definitely, that this type is developed from the follicle of a tooth. The term "dentigerous" cysts is used quite loosely and may refer to either of the