Dental Radiography Quiz & Flashcards for Chapter 18

Questions and Answers

What is an Angle (A) in geometry?

A figure formed by 2 lines diverging from a common point.

What does Angulation refer to in dental radiography?

Alignment of the central ray of the x-ray beam in horizontal and vertical planes.

What is Horizontal Angulation?

The positioning of the PID and the direction of the central ray in a side-to-side plane.

What is Vertical Angulation?

The positioning of the PID in a vertical, or up-and-down, plane. Signup and view all the answers

Vertical angulation differs according to the imaging technique used.

True Signup and view all the answers

What is a beam alignment device?

A tool used to position an intraoral receptor in the mouth and maintain it during exposure. Signup and view all the answers

What does it mean to Bisect (B)?

To divide into 2 equal parts. Signup and view all the answers

What is the Bisecting Technique?

An intraoral radiographic technique to expose periapical receptors using an imaginary bisector. Signup and view all the answers

What is the Imaginary Bisector in dental radiography?

A plane that divides in half the angle formed by the receptor and the long axis of the tooth. Signup and view all the answers

What is the Central Ray?

The central portion of the primary beam of x-radiation. Signup and view all the answers

What is Elongation in the context of dental images?

Images of the teeth that appear too long due to insufficient vertical angulation. Signup and view all the answers

What is an Exposure Sequence?

A definite order for periapical receptor placements and exposures that must be followed. Signup and view all the answers

What is Foreshortening in dental radiography?

Radiographic images that appear shortened due to excessive vertical angulation. Signup and view all the answers

What is a Hypotenuse (G)?

The side of a right triangle opposite the right angle. Signup and view all the answers

What does Isometry mean?

Equality of measurement. Signup and view all the answers

What is the Rule of Isometry?

A principle that states two triangles are equal if they have two equal angles and share a common side. Signup and view all the answers

What is the Long Axis of a tooth?

An imaginary line that divides the tooth longitudinally into two equal halves. Signup and view all the answers

What is Receptor Placement?

The specific area where the receptor must be positioned before exposure. Signup and view all the answers

What are Anterior Teeth?

Canines and Incisors. Signup and view all the answers

What are Posterior Teeth?

Premolars and Molars. Signup and view all the answers

What is a Triangle (C) in geometry?

A figure formed by connecting three points not in a straight line by three straight-line segments. Signup and view all the answers

What is an Equilateral Triangle (D)?

A triangle with a 90 degree angle. Signup and view all the answers

What is a Right Triangle (E)?

A triangle with one 90 degree angle. Signup and view all the answers

What are Congruent Triangles (F)?

Triangles that are identical and correspond exactly when superimposed. Signup and view all the answers

What are the Principles of the Bisecting Technique?

The bisecting technique is based on a simple geometric principle known as the rule of isometry. Signup and view all the answers

Study Notes

Key Terms in Bisecting Technique

Angle (A): Formed by two lines diverging from a common point in geometry.
Angulation: Alignment of the central ray of the x-ray beam in both horizontal and vertical planes.
Horizontal Angulation: Positioning of the PID and direction of the central ray in a side-to-side plane; principles remain consistent across paralleling, bisecting, and bite-wing techniques.
Vertical Angulation: Positioning of the PID in a vertical plane; measured in degrees and noted on the tubehead exterior.

Variations in Vertical Angulation

Paralleling Technique: Center ray is directed perpendicular to both the receptor and the long axis of the tooth.
Bisecting Technique: Central ray is directed perpendicular to the imaginary bisector created between the receptor and tooth axis.
Bite-wing Technique: Angle is predetermined; the central ray is positioned at +10 degrees to the occlusal plane.

Components of Bisecting Technique

Beam Alignment Device: Aids in the correct positioning of an intraoral receptor during exposure.
Bisect (B): Means to divide an angle into two equal parts.
Bisecting Technique: An intraoral radiographic method using a receptor placed along the lingual surface of a tooth, where the central ray is directed perpendicularly to the imaginary bisector.

Visualization in Bisecting Technique

Imaginary Bisector: A visualized plane that equally divides the angle between the receptor and the tooth's long axis, creating two equal angles for triangle calculation.

Radiographic Imaging Issues

Elongation: Occurs when vertical angulation is insufficient, resulting in over-elongated images.
Foreshortening: Happens with excessive vertical angulation, causing shortened images.

Geometric Principles

Hypotenuse (G): The side opposite the right angle in a right triangle.
Isometry: Equality of measurement.
Rule of Isometry: Core principle stating two triangles are equal if they have two equal angles and a shared side, foundational for bisecting technique.

Tooth Anatomy Terminology

Long Axis (Tooth): An imaginary line dividing the tooth into two equal longitudinal halves.
Receptor Placement: Specific area designated for receptor positioning prior to exposure.
Anterior Teeth: Include canines and incisors.
Posterior Teeth: Comprise premolars and molars.

Geometric Triangle Types

Triangle (C): Formed by connecting three points not in a straight line with three segments.
Equilateral Triangle (D): A triangle characterized by one right angle.
Right Triangle (E): Contains one 90-degree angle.
Congruent Triangles (F): Identical triangles that perfectly correspond when superimposed.

Principles of the Bisecting Technique

The rule of isometry serves as the foundational geometric basis for the bisecting technique in dental imaging, ensuring accurate angle measurement and resultant image quality.

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Description

Explore the bisecting technique in dental radiography with this flashcard quiz based on Chapter 18. Perfect for students looking to understand key terminology and concepts related to angles and angulation within radiographic techniques.

Dental Radiography Chapter 18