Dental Dictionary
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Occlusal
The chewing or grinding surface of a bicuspid and molar teeth (back teeth).
Occlusal Guard
A removable acrylic device used to minimize the effects of grinding the teeth (bruxism) or joint problems (TMJ). It is usually worn at night to prevent the grinding of teeth or relieve joint pain. Also known as a night guard.
Occlusal Plane
The imaginary plane on which upper and lower teeth meet.
Occlusal X-ray
An intraoral X-ray that is taken with the film held between the upper and lower teeth in biting position. The X-ray shows the entire upper or lower arch on one film.
Occlusion
The alignment and spacing of the upper and lower teeth when they bite together; often called "the bite."
Onlay
A cast gold or porcelain restoration that is extended to cover the cusps for protection of the tooth. It can also be used to replace one or more of the cusps of a tooth.
Open Bite
A malocclusion in which the teeth do not close or come together in the front of the mouth.
Operative Dentistry
The restoration of decayed and broken teeth with silver, gold and tooth-colored materials.
Oral and Maxillofacial Surgeon
A specialist who deals with the diagnosis and treatment of diseases, injuries and deformities of the mouth and supporting structures.
Oral Hygiene
The practice of personal hygiene of the mouth. It includes the maintenance of oral cleanliness, tissue tone and general preservation of oral health.
Oral Surgery
Operations in and about the oral cavity and jaws, such as extractions, removal of cysts or tumors, and repair of broken jaws.
Orthodontia
Braces.
Orthodontics
A specialized branch of dentistry that corrects malocclusion and restores the teeth to proper alignment and function. The treatment usually consists of braces or other appliances to correct a patient's bite, straighten the teeth and treat problems related to growth and development of the jaws.
Orthodontist
A dentist who has been specially trained in orthodontics.
Overbite
The vertical overlapping of the upper teeth over the lower teeth when the jaw is closed.
Overdenture
A denture that fits over tooth roots or dental implants.
Overjet
The horizontal projection of upper teeth beyond the lower when the jaw is closed. This condition can be corrected with orthodontics.