Which technique is most effective for examining interproximal surfaces of teeth?

Bitewing radiography is the most effective technique for examining the interproximal surfaces of teeth because it provides a clear view of the areas between the teeth where cavities are most likely to occur. The bitewing image is taken with the patient biting down on a special film or sensor, which positions the film or sensor to capture the crowns of both the upper and lower teeth in a single image. This positioning allows for optimal visualization of the interproximal surfaces, enabling the detection of caries, bone levels, and interproximal pathology.

In contrast, periapical radiography primarily focuses on the entire tooth, including the root and surrounding structures, which may not provide as detailed of a view of the interproximal area. OTN (Occlusal Topographical Numbering) radiography is used primarily for examining the contours of the occlusal surfaces and is not specifically designed for interproximal examination. Panoramic radiography offers a broad view of the entire dental arch but lacks the specific detail necessary for accurately assessing the interproximal surfaces of teeth.

Thus, bitewing radiography stands out as the optimal choice for this particular purpose, as it directly addresses the need to examine interproximal surfaces in detail.