Critical Thinking Qs #1

Question 1

This type of intraoral radiograph is used to examine in detail the entire tooth (crown and root) and supporting bone. Emphasis is to the show the terminal end of the tooth root and surrounding bone.

Answer 1

periapical

Question 2

This type of intraoral radiograph is used to examine large areas of the maxilla or the mandible on one image. The patient bites on the entire receptor.

Answer 2

occlusal

Question 3

A ___________ would result if the operator placed the position-indicating device (PID) with incorrect horizontal angulation. For example, if the PID was positioned too far distally, the anterior portion of the receptor would receive no radiation, resulting in a white artifact on the image.

Answer 3

cone cut

Question 4

If an operator positions the PID with not enough vertical angulation, the image will appear too flat and “stretched out”. This is called ______

Answer 4

elongation

Question 5

According to the basic principle of the paralleling technique, the receptor is placed in the mouth _________________ to the long axis of the tooth being radiographed. The central ray of the x-ray beam is positioned ____________________ to the receptor and long axis of the tooth.

Answer 5

parallel; perpendicular

Question 6

When exposing a posterior periapical (PA), the receptor is placed in a _______________ direction. For an anterior PA, the receptor is placed in a _____________ direction.

Answer 6

horizontal; vertical

Question 7

When determining vertical angulation, if the position-indicating device (PID) is positioned above the occlusal plane, the central ray is directed ____________. This would make the vertical angulation _________________. This angulation would be used for maxillary projections.

Answer 7

downward; positive

Question 8

According to the basic principles of the bisecting angle technique, the central ray is directed _____________ to the imaginary bisector that divides in half the angle formed by the long axis of the tooth and the ___________________.

Answer 8

perpendicular; receptor

Question 9

A student is taking a FMX using paralleling technique. The patient has a palatal torus in the midline of the palate which is making placement of the XCP difficult for maxillary posterior projections. What should the student do to still capture the apices of the teeth while minimizing patient discomfort?

Answer 9

The receptor should be placed on the far side of the torus, further from the tooth being radiographed.