There are ________ grams of pure drug in a 48% solution

For an AP axial clavicle projection,

1. the patient's shoulders are positioned at equal distances from the IR. 2. the central ray is angled 15 to 30 degrees cephalad. 3. a compensating filter is positioned over or under the lateral clavicle. 4. the central ray is centered halfway between the medial and lateral clavicular ends. a. 2 and 4 only b. 1 and 3 only c. 1, 3, and 4 only d. 1, 2, 3, and 4

Explain the gate control theory of pain perception related to the use of pressure anesthesia for palatal injections

What will be an ideal response?