Horizontal vs vertic. Overjet is the horizontal difference between the upper and lower teeth the more the upper teeth stick out horizontally the bigger the overjet. Overbite is the vertical overlap of upper and lower teeth.
Up/down--front/back. Both are measurements of how the upper and lower front teeth align, and their relationship to each other. The overjet is the horizontal relationship, or how much the upper front teeth stick out in front of the lower teeth. The overbite is the verticle relationship or how much the upper teeth overlap or hide the lower teeth. People mix up these terms, but your dentist or orthodontist will know.
Overjet/overbite. Overjet is the horizontal distance from the front of the lower incisors to the biting edge of the upper incisors, normal about 2mm. Overbite is the amount of the lower incisors covered by the upper incisors, usually about 2mm or 27%. Any other relationship should be evaluated by an Orthodontic Specialist...initial exam usually complimentary. Read more...