The word “odontodysplasia” was coined by Zegarelli, et al. (1963). Because this abnormality has a tendency to affect only one quadrant, “regional odontodysplasia” became the most accepted term to define it. The same condition has been described under other denominations, such as “odontogenic dysplasia, “localized arrested tooth development” “ghost teeth, “odontogenesis imperfecta”, “unilateral ...