OCCLUSION:
Closure; relationship of the upper and lower teeth upon closure.

ONLAY:
Laboratory produced restoration covering one or more cusps of a tooth.

ORAL AND MAXILLOFACIAL SURGEON:
A dental specialist who manages the diagnosis & surgical treatment of diseases, injuries, and deformities of the mouth and supporting structures; Requires four additional years of training after dental school.

ORAL CAVITY:
The mouth.

ORAL HYGIENE:
Process of maintaining cleanliness of the teeth and related structures.

ORAL AND MAXILLOFACIAL SURGERY:
Surgical procedures on the mouth including extractions, removal of cysts or tumors, and repair of fractured jaws.

ORAL PATHOLOGIST:
Dentist specializing in the study of oral diseases.

ORTHODONTICS:
Dental specialty that treats misalignment of teeth.

OSSEOUS:
Boney.

OVERBITE:
Vertical overlap of the front teeth.

OVERDENTURE:
Denture that fits over residual roots or dental implants.

OVERJET:
Horozontal overlap of the front teeth.

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