The receptor must be placed straight or perpendicular with the occlusal plane or placed farther away from the teeth to avoid this error. When this occurs, the occlusal plane will appear crooked. When exposing bitewing radiographs, the top edge of the receptor may come in contact with the palatal gingiva or curvature of the palate or the lingual aspect of the mandible. When the receptor is not placed perpendicular to the occlusal plane, the occlusal plane will appear slanted or diagonal on the recorded image. Placement of the bite block and receptor in the correct position first and then having the patient slowly bite to maintain the placement is the preferred and most effective approach. Placing the receptor more lingual to the teeth where the palate and floor are deeper will make positioning easier and more comfortable for the patient. If the bite block is placed on the opposing teeth and the patient is required to bite the receptor into place, a placement error is likely to result. ![]() When using receptor holders, the bite block should be placed on the teeth to be imaged and not on the opposing teeth. Missing apices can be caused by a receptor placement error.
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