To accurately record the alveolar crestal bone, which of the following is necessary?
A) Precise parallelism with vertical and horizontal angulations
B) Placement of the image receptor parallel to the long axis of the tooth
C) Central rays of the x-ray beam directed perpendicular to the tooth and image receptor
D) All of the above
D
Explanation: A) Precise parallelism with vertical and horizontal angulation, placement of the image receptor parallel to the long axis of the tooth, and directing the central rays of the x-ray beam perpendicular to the tooth and image receptor are all shadow-casting principles for accurately recording the alveolar bone crest.
B) Precise parallelism with vertical and horizontal angulation, placement of the image receptor parallel to the long axis of the tooth, and directing the central rays of the x-ray beam perpendicular to the tooth and image receptor are all shadow-casting principles for accurately recording the alveolar bone crest.
C) Precise parallelism with vertical and horizontal angulation, placement of the image receptor parallel to the long axis of the tooth, and directing the central rays of the x-ray beam perpendicular to the tooth and image receptor are all shadow-casting principles for accurately recording the alveolar bone crest.
D) Precise parallelism with vertical and horizontal angulation, placement of the image receptor parallel to the long axis of the tooth, and directing the central rays of the x-ray beam perpendicular to the tooth and image receptor are all shadow-casting principles for accurately recording the alveolar bone crest.
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