Is it acceptable to recline the chair or tip the headrest back to facilitate obtaining an occlusal radiograph?

What will be an ideal response?

Yes. For the mandibular cross-sectional occlusal radiograph, the occlusal plane should be perpendicular to the floor. If these planes cannot be achieved by moving the patient's head, it is acceptable to either recline the chair and/or tip the headrest backward to achieve the correct patient position.