Jaw DiseasesJaw: Bony structure of the mouth that holds the teeth. It consists of the MANDIBLE and the MAXILLA.Jaw Neoplasms: Cancers or tumors of the MAXILLA or MANDIBLE unspecified. For neoplasms of the maxilla, MAXILLARY NEOPLASMS is available and of the mandible, MANDIBULAR NEOPLASMS is available.Jaw Abnormalities: Congenital absence of or defects in structures of the jaw.Bisphosphonate-Associated Osteonecrosis of the Jaw: Necrotic jaws or other maxillofacial skeleton necrosis associated with bisphosphonate use (see BISPHOSPHONATES). Injury, dental procedures, and trauma can trigger the necrotic process.Masticatory Muscles: Muscles arising in the zygomatic arch that close the jaw. Their nerve supply is masseteric from the mandibular division of the trigeminal nerve. (From Stedman, 25th ed)Jaw, Edentulous: The total absence of teeth from either the mandible or the maxilla, but not both. Total absence of teeth from both is MOUTH, EDENTULOUS. Partial absence of teeth in either is JAW, EDENTULOUS, PARTIALLY.Jaw Cysts: Saccular lesions lined with epithelium and contained within pathologically formed cavities in the jaw; also nonepithelial cysts (pseudocysts) as they apply to the jaw, e.g., traumatic or solitary cyst, static bone cavity, and aneurysmal bone cyst. True jaw cysts are classified as odontogenic or nonodontogenic.Osteonecrosis: Death of a bone or part of a bone, either atraumatic or posttraumatic.Masseter Muscle: A masticatory muscle whose action is closing the jaws.Mandible: The largest and strongest bone of the FACE constituting the lower jaw. It supports the lower teeth.Jaw, Edentulous, Partially: Absence of teeth from a portion of the mandible and/or maxilla.Bite Force: The force applied by the masticatory muscles in dental occlusion.