The Cause of an Excessive Margin of Receptor Edge (Which

question 12

Multiple Choice

The cause of an excessive margin of receptor edge (which appears as a black band) on a nondiagnostic periapical image is

• A)the edge of the receptor was not placed parallel to the incisal-occlusal surfaces of the teeth.
• B)the receptor was not positioned in the patient's mouth to cover the apical regions of the teeth.
• C)the receptor was underexposed.
• D)the central ray was not directed through the interproximal spaces.

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