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

Horizontal overlap of the front teeth

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