patient management

Question 1

take PA of 3rd molars

Answer 1

• put image receptor more anteriorly
• x ray tube more posteriorly

Question 2

take PA of max canine

Answer 2

• vertical PA placed normally cannot see proximal surfaces between 3 and 4 so need to:
• PSP plate diagonal and more anteriorly placed
• tube angle positioned more distally

Question 3

take PA with palatal torus

Answer 3

• dont rest plate on torus
• dont put plate behind torus but in front of torus (means closer to teeth than distance between torus and teeth) –> avoid radiopaque shadow over root apices

Question 4

take PA w shallow palate/shallow floor of mouth

Answer 4

• cannot use paralleling technique
• use bisecting angle technique
• beam is at right angles to the plane that bisects the tooth and image receptor

Question 5

take PA w ankyloglossia (tongue tied)

Answer 5

• tongue tied –> short lingual frenum –> tongue mobility limited –> cannot push plate far enough to take root of incisors
• use bisecting angle technique
• plate placed on tongue

Question 6

take PA of pt w trismus (lock jaw)

Answer 6

• cannot open mouth much
• best to take DPT
• use PA w snap a ray xtra