An intraoral radiograph is a dental X-ray image produced by positioning the imaging receptor — film, digital sensor, or phosphor storage plate — inside the patient’s mouth, enabling precise visualization of individual teeth, the surrounding alveolar bone, and supporting periodontal structures.

Clinical Significance

Because the receptor sits in direct proximity to the area of interest, intraoral radiographs deliver substantially higher resolution than extraoral alternatives. This closeness allows clinicians to detect early interproximal caries, evaluate the width and continuity of the periodontal ligament space, identify periapical pathology, and assess root morphology before and after endodontic or surgical treatment. No other chairside imaging modality matches the level of fine anatomical detail these radiographs provide.

Types of Intraoral Radiographs

Three primary projections are used in clinical practice, each serving a distinct diagnostic purpose:

• Periapical radiograph: Captures the entire tooth from crown to root apex along with the surrounding bone, making it essential for diagnosing periapical abscesses, root fractures, and vertical bone loss patterns.
• Bitewing radiograph: Images the crowns and coronal thirds of both maxillary and mandibular teeth simultaneously, serving as the standard view for detecting interproximal caries and monitoring crestal alveolar bone height over time.
• Occlusal radiograph: Provides a broad view of an entire arch, useful for locating impacted or supernumerary teeth, calcified structures, or pathologic lesions within the palate or floor of the mouth.

Technique and Radiation Safety

Accurate receptor placement, precise beam angulation, and the use of positioning devices are essential to minimize geometric distortion. The paralleling technique — in which the receptor is held parallel to the tooth’s long axis with the central beam directed perpendicular to both — produces the most reliable, reproducible images and is preferred over the bisecting-angle method in most clinical situations.

Although radiation exposure from intraoral radiographs is very low, practitioners follow ALARA principles by using rectangular collimation, lead aprons, thyroid collars, and evidence-based selection criteria tied to each patient’s caries risk, periodontal status, and clinical findings rather than fixed recall intervals.

Taken at appropriate intervals and interpreted alongside a thorough clinical examination, intraoral radiographs are indispensable for catching disease early, monitoring treatment outcomes, and delivering consistent, high-quality dental care.