| OA/BVM | oral airway/bag-valve-mask |
|---|---|
| OAS | old age security; oral allergy syndrome; osmotically active substance |
| OAW | oral airways |
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
| cavity liner | varnish (dental) |
|---|---|
| cavity margin | The periphery of a filling, the line of junction between a restoration and the external surface of a tooth. (05 Mar 2000) |
| cavity of concha | The space within the lower, larger portion of the concha below the crus helicis; it forms the vestibule leading into the external acoustic meatus. Synonym: cavum conchae. (05 Mar 2000) |
| cavity of larynx | A cavity that is continuous above with the pharynx at the level of the aryepiglottic folds and extends downward through the rima glottidis to the infraglottic space. Synonym: cavitas laryngis, cavum laryngis. (05 Mar 2000) |
| cavity of middle ear | An air chamber in the temporal bone containing the ossicles; it is lined with mucous membrane and is continuous with the auditory tube anteriorly and the tympanic antrum and mastoid air cells posteriorly. Synonym: cavitas tympanica, cavity of middle ear, cavum tympani, tympanum. (05 Mar 2000) |
| cavity of pharynx | It consists of a nasal part (nasopharynx) continuous anteriorly with the nasal cavity and receiving the openings of the auditory tubes, an oral part (oropharynx) opening through the fauces into the oral cavity, and a laryngeal part (laryngopharynx) leading into the vestibule of the larynx and to the oesophagus. Synonym: cavitas pharyngis, cavum pharyngis. (05 Mar 2000) |
| cavity of septum pellucidum | A slitlike, fluid-filled space of variable width between the left and right transparent septum, which occurs in less than 10% of human brains and may communicate with the third ventricle. Synonym: cavum septi pellucidi, Duncan's ventricle, fifth ventricle, pseudocele, pseudoventricle, sylvian ventricle, ventricle of Sylvius, ventriculus quintus, Vieussens' ventricle, Wenzel's ventricle. (05 Mar 2000) |
| cavity of tooth | The central hollow of a tooth consisting of the crown cavity and the root canal; it contains the fibrovascular dental pulp and is lined throughout by odontoblasts. Synonym: cavitas dentis, cavity of tooth, cavum dentis. (05 Mar 2000) |
| cavity preparation | Removal of dental caries and surgical preparation of the remaining tooth structure to receive a dental restoration, the final form of an excavation in a tooth resulting from such preparation. Corrosion preparation, a preparation in which the hollow parts such as ducts, vessels, or alveoli of the lung are filled with a substance that hardens and persists after dissolving the tissues by digestion. Cytologic filter preparation, a cytologic specimen made by depositing a watery sample (obtained by a variety of methods from many body sites) upon a filter having pores of uniform size smaller than the cellular material to be concentrated; this is followed by fixation and staining, usually with 95% ethyl alcohol and Papanicolaou stain. Heart-lung preparation, an animal preparation in which blood (rendered incoagulable) circulates through the heart and lungs and through an artificial system of vessels representing the systemic circulation; the latter is connected with the divided aorta on the one hand and with the superior vena cava on the other; used in physiologic studies of the heart and circulation. (05 Mar 2000) |
| cavity preparation base | <dentistry> A layer of dental cement, sometimes medicated, that is placed in the deep portion of a cavity preparation to protect the pulp, reduce the bulk of a metallic restoration, or eliminate undercuts. Synonym: cavity preparation base. (05 Mar 2000) |
| cavity preparation form | The configuration or shape of a cavity preparation. (05 Mar 2000) |
| cavity wall | One of the surfaces bounding a cavity. (05 Mar 2000) |
| glenoid cavity | A deep hollow in the squamous portion of the temporal bone at the root of the zygoma, in which rests the condyle of the mandible. Synonym: cavitas glenoidalis, fossa mandibularis, articular fossa of temporal bone, glenoid cavity, glenoid fossa, glenoid surface. (05 Mar 2000) |
| Meckel's cavity | The cleft in the meningeal layer of dura of the middle cranial fossa near the tip of the petrous part of the temporal bone; it encloses the roots of the trigeminal nerve and the trigeminal ganglion. Synonym: cavum trigeminale, Meckel's cavity, Meckel's space, trigeminal cavity. (05 Mar 2000) |
| visceral cavity | The celom or one of the body cavity's derived from it. Synonym: visceral cavity. (05 Mar 2000) |