(Periapical Technique Errors) Angulation Problems

Question 1

Incorrect Horizontal Angulation

Answer 1

Appearance: overlapped contacts are seen on the image
Cause: The central ray was not directed through the interproximal spaces. AS a result, the proximal surfaces of adjacent teeth appear overlapped in the periapical image. The error occurs with both the paralleling and bisecting technique.
Correction: Direct the x-ray beam THROUGH the interproxial regions.

Question 2

Types of Incorrect Vertical Angulation?

Answer 2

• Foreshortened Images

* Elongated images

Question 3

Foreshortened Images

Answer 3

Appearance: teeth appear short with blunted roots on the image.
Cause: Vertical angulation was excessive (too steep) image is shorter than actual teeth.
Correction: Do not use excessive vertical angulation with the bisecting technique.

Question 4

Elongated Images

Answer 4

Appearance: Teeth appear long and distorted on the image
Cause: Vertical angulation was insufficient (too flat) Image is longer than actual teeth. (occurs more on bisecting technique)
Correction: use adequate vertical angulation with the bisecting technique.