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The raised dot on a dental film is a reference marker used to establish correct orientation when mounting radiographs. For periapical films, the standard practice is to point the dot toward the occlusal (chewing) surfaces of the teeth. This creates a consistent top-to-bottom orientation so you can read the image correctly and distinguish left from right. If the dot faced the buccal, lingual, or mesial edge, the film would be mounted with an inconsistent orientation, which can lead to misinterpretation or labeling errors.