Obstructive Sleep Apnea – A disorder in which breathing stops for short periods of time during sleep.
Occlusal – Pertaining to the biting surfaces of the premolar and molar teeth or contacting surfaces of opposing teeth or opposing occlusion rims.
Occlusion – Any contact between biting or chewing surfaces of maxillary (upper) and mandibular (lower) teeth.
Onlay – An indirect restoration made outside the oral cavity that overlays a cusp or cusps of the tooth, which is then luted to the tooth.
Oral – Pertaining to the mouth.
Oral and Maxillofacial Surgeon – A dental specialist whose practice is limited to the diagnosis, surgical and adjunctive treatment of diseases, injuries, deformities, defects and esthetic aspects of the oral and maxillofacial regions.
Oral Mucosa – The pink-red tissues that line the mouth.
Orthodontist – A dental specialist whose practice is limited to the interception and treatment of malocclusion of the teeth and their surrounding structures.
Orthognathic Surgery – Surgery performed to correct facial imbalances caused by abnormalities of the jaw bones.
Osseointegration – The process by which bone heals around an implant.
Osteoplasty – Surgical procedure that modifies the configuration of bone.
Osteotomy – Surgical cutting of bone.
Overdenture – A removable prosthetic device that overlies and may be supported by retained tooth roots or implants.