What type of angulation is commonly used when taking radiographs at the mandibular arch?

When taking radiographs at the mandibular arch, negative angulation is commonly employed. This technique involves tilting the x-ray tube downward, which is necessary because the mandibular arch is positioned below the level of the maxilla.

Negative angulation allows for an optimal projection of the anatomical structures within the mandible, minimizing distortions and ensuring that the radiographic image accurately represents the underlying bone and teeth. This is crucial for diagnosing conditions affecting the mandible, such as caries, periodontal disease, or fractures. Understanding the appropriate angulation is essential for dental professionals to obtain diagnostic-quality images while minimizing patient exposure to radiation.