Premolar Radiograph: Clinical Report

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Clinical Tip #2

When taking bitewing radiographs digitally, it is best to take the premolar area first. When a premolar radiograph is taken before the molars, it will give the practitioner a map for taking the molar radiograph. If crowns are high under the tissue, it will allow it to be seen prior to the taking of the next radiograph. This will give an idea of how high the PID needs to be placed near the facial area of the molars.


Alternating current (AC): Current flows in one direction, then the opposite direction in the circuit.

Central ray: That x0ray located in the center of the x-ray beam as it leaves the tube head.

Collimation: The process of restricting the size and shape of the x-ray beam.

Direct current (DC): Electric current that flows in one direction and does not reverse itself.

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The higher the settings, the more intense the beam being output from the PID. An increase in exposure time will increase the intensity of the x-ray beam. But when the focal-film distance (FFD) increases, intensity decreases due to divergence of a beam produces a larger field. I believe the half-value layer (HVL) to be a harder concept to grasp, so I am writing about it in this lecture. HVL represents the quality (penetration) of the x-rays emitted from the tube. HVL is the thickness of aluminum (in millimeters) that will reduce the intensity of the x-ray beam by 50%. Be sure to read all the pages in your chapters, so you will be ready to answer the questions in your study guide. Yes, some of the information we will be learning in this class will not pertain to practitioners in offices with digital radiography. However, you never know what life and job changes may come your way. It is important to be ready to use regular film packets and know how to develop them. We will be going over the study guide answers at our meeting for clinical
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