Dentistry Chapter 20 Do not unwrap in a room with white light

Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 1

Exposure and Technique Errors

Chapter 20

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Slide 2

Learning Objectives

Lesson 20.1: Receptor Exposure

and Technique Errors

1. Define the key terms associated with exposure

and technique errors.

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Slide 3

Learning Objectives

Lesson 20.1: Receptor Exposure

and Technique Errors (Cont.)

4. Describe horizontal and vertical angulation.

5. Identify and describe the appearances of the

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 4

Introduction

Only diagnostic images are useful

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Slide 5

Receptor Exposure Errors

Receptor exposure errors that result in

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Slide 6

Unexposed Receptor

Receptor

May occur with digital sensors or film

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 7

Film Exposed to Light

Receptor

Occurs only with film

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Slide 8

Overexposed Receptor

Receptor

May occur with digital sensors or film

Appearance

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Slide 9

Underexposed Receptor

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 10

Periapical Technique Errors

Receptor placement problems

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Slide 11

Receptor Placement Problems

Each periapical receptor must be positioned

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Slide 12

Absence of Apical Structures

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 13

Dropped Receptor Corner

Receptor

May occur with digital sensors or film

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Slide 14

Angulation Problems

Angulation: Describes the alignment of the

central ray of the x-ray beam in the horizontal

and vertical planes

Can be varied by moving the PID in either a

horizontal or vertical direction

•Horizontal angulation: refers to the positioning of the PID

in a horizontal, side-to-side plane

•Vertical angulation: refers to the positioning of the PID in

a vertical, up-and-down plane

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Slide 15

Overlapped Contacts: Incorrect

Horizontal Angulation

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 16

Overlapped Contacts: Incorrect

Horizontal Angulation (Cont.)

Cause

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Slide 17

Foreshortened Images: Incorrect

Vertical Angulation

Receptor

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Slide 18

Foreshortened Images: Incorrect

Vertical Angulation (Cont.)

Cause

Excessive vertical angulation

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 19

Elongated Images: Incorrect

Vertical Angulation

Receptor

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Slide 20

Elongated Images: Incorrect

Vertical Angulation (Cont.)

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Slide 21

Position Indicating Device (PID)

Alignment Problems

If the PID is misaligned and the x-ray beam is

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 22

Cone-Cut with Beam

Alignment Device

Receptor

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Slide 23

Cone-Cut with Beam

Alignment Device (Cont.)

Cause

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Slide 24

Cone-Cut Without Beam

Alignment Device

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 25

Cone-Cut Without Beam

Alignment Device (Cont.)

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Slide 26

Learning Objectives

Lesson 20.2: Bite-Wing Exposure

and Technique Errors

7. Identify and describe the appearances of the

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Slide 27

Learning Objectives

Lesson 20.2: Bite-Wing Exposure

and Technique Errors (Cont.)

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 28

Bite-Wing Technique Errors

Receptor placement problems

Correct receptor placement

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Slide 29

Receptor Placement Problems

Premolar bite-wing

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Slide 30

Incorrect Receptor Placement

of Premolar Bite-Wing

Receptor

May occur with digital sensors or film

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 31

Incorrect Receptor Placement

of Premolar Bite-Wing (Cont.)

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Slide 32

Incorrect Placement

of Molar Bite-Wing

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Slide 33

Incorrect Placement

of Molar Bite-Wing (Cont.)

Cause

The bite-wing receptor was positioned too far

anteriorly in the mouth.

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 34

Angulation Problems

Dental radiographer must be prepared to

choose the correct horizontal and vertical

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Slide 35

Overlapped Contacts: Incorrect

Horizontal Angulation

Receptor

May occur with digital sensors or film

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Slide 36

Overlapped Contacts: Incorrect

Horizontal Angulation (Cont.)

Cause

The central ray was not directed through the

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 37

Distorted Image: Incorrect

Vertical Angulation

Receptor

May occur with digital sensors or film

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Slide 38

Distorted Image: Incorrect

Vertical Angulation (Cont.)

Cause

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Slide 39

Position Indicating Device (PID)

Alignment Problems

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 40

Cone-Cut with Beam

Alignment Device

Receptor

May occur with digital sensors or film

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Slide 41

Cone-Cut with Beam

Alignment Device (Cont.)

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Slide 42

Cone-Cut Without Beam

Alignment Device

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 43

Cone-Cut Without Beam

Alignment Device (Cont.)

Cause

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Slide 44

Miscellaneous Technique Errors

Bending

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Slide 45

Bending

Receptor

May occur with indirect digital sensors or film

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 46

Bending (Cont.)

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Slide 47

Creasing

Receptor

May occur with indirect digital sensors or film

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Slide 48

Creasing (Cont.)

Cause

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 49

Debris Accumulation

Receptor

May occur with digital sensors

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Slide 50

Debris Accumulation (Cont.)

Cause

Sensors not handled carefully or wiped between

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Slide 51

Phalangioma

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 52

Phalangioma (Cont.)

Cause

The patient’s finger was positioned in front of the

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Slide 53

Double Image

Receptor

May occur with indirect digital sensors or film

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Slide 54

Double Image (Cont.)

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 55

Movement/Motion Unsharpness

Receptor

May occur with digital sensors or film

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Slide 56

Movement/Motion Unsharpness (Cont.)

Cause

The patient moved during exposure of the

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Slide 57

Reversed/Backward Placement

Receptor

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 20 Student Handout

Slide 58

Reversed/Backward Placement (Cont.)

Cause

The receptor was placed backward in the mouth

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Slide 59

Questions?

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