An open-mouth X‑ray (odontoid view) visualizes the upper cervical spine—C1 (atlas), C2 (axis) and the odontoid process (dens)—by having the patient open the mouth to avoid mandible overlap. It detects fractures, dislocations, atlanto‑axial misalignment, congenital anomalies, infection or degenerative changes, and foreign bodies. It’s commonly used after trauma or with unexplained neck pain to assess stability.

An open‑mouth neck X‑ray (odontoid view) is taken so the jaw and teeth don’t block the atlas (C1), axis (C2) and the odontoid (dens). Opening the mouth clears mandibular overlap, allowing clear visualization of the C1–C2 alignment and joints to detect fractures, dislocations, misalignments or bone abnormalities after trauma or when neck pain or neurological signs suggest upper cervical injury.

The lateral view is the single most important cervical spine X‑ray: it best shows vertebral alignment, anterior/posterior elements, disc spaces, and can detect fractures, subluxation, or prevertebral soft‑tissue swelling; it should include the C7–T1 junction. Additional AP, open‑mouth (odontoid) or oblique views—and CT or flexion‑extension studies—are used for suspected fractures, foraminal detail, or instability.

A cervical spine X-ray evaluates the bones and alignment of the neck. It’s used after trauma to detect fractures or dislocation, for persistent neck pain to show degenerative changes, arthritis or congenital abnormalities, and to monitor post‑operative hardware. It can suggest infection or tumor and guides whether further imaging (CT or MRI) is needed to assess soft tissues, discs, or spinal cord.

A C1 open-mouth X-ray (odontoid or AP open-mouth view) images the first two cervical vertebrae with the patient's mouth open so the odontoid process (dens) and lateral masses of C1 and C2 are visible. It helps detect fractures, misalignment, dislocation, arthritis, or infection after neck trauma. Teeth or poor positioning can obscure detail; CT is often used if X-ray is inconclusive.

A full‑mouth X‑ray (FMX) involves a series of intraoral images—typically 14–20 periapical and bitewing films—or a single panoramic image. The patient wears a lead apron, removes metal, and bites on film holders while the sensor or film is positioned. The operator steps out and briefly exposes each shot; a panoramic machine rotates once around the head. The whole exam takes 10–20 minutes and uses low radiation.