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Radio Lect 1

Radiology Winter

QuestionAnswer
What are the criteria for intraoral radiographic quality? 1. Complete area of interest 2. Projection accuracy/minimal distortion 3. Optimum density
Guidelines for Periapical Radiographs • Includes 2 mm of bone beyond apex of target tooth • Entire tooth-bearing area is imaged
Guidelines for Bitewing Radiographs • Includes all posterior proximal surfaces • Covers crestal bone of maxilla/mandible
Define Supplemental Films • Any additional projection needed to view a lesion • Examples: Occlusal view or Distal molar view
Define Projection Accuracy/Minimal distortion • Paralleling vs Bisecting-angle technique • Vertical angulation where B/L cusp tips are superimposed • Horizontal Angulation (minimal overlap)
Define Optimum Density and Contrast • Controlled by mA, kVp, exposure time, processing of film, image enhancement of digital images • Density--cannot see pencil point behind blackened area of film • Contrast--clear distinction between enamel, dentin, pulp on film or digital image
What are the goals of the paralleling technique for PA's? • image receptor parallel to long axis of tooth/teeth • central beam perpendicular to teeth and film/sensor
What are the goals of the bisecting angle technique for PA's? • Image receptor is placed close to the tooth with superior edge resting on the palate or floor of the mouth and the other edge contacting the tooth • Central beam is perpendicular to image receptor
Review: Lower kVP has _______ contrast? Higher kVp has ______ shades of grey? Higher More
What instruments do you need for parallel technique? • XCP instruments • Precision instruments • Stabe bite blocks • Snap-A-Ray • Hemostat
What instruments do you need for the bisecting angle technique? • Bisecting-angle instruments • Snap-A-Ray
Technique for Anterior PA Center tooth on film sensor
Technique for Posterior PA Anterior edge of receptor on guiding tooth. Canine for Premolars and 2nd Premolar for Molars
Technique for Distal Molar PA Center the 3rd molar, more positive angulation for maxillary, more distal angulation for maxillary/mandibular.
What are the goals of Bitewings? • Open appropriate contacts (between 1st and 2nd maxillary Molar or Premolar). • Include alveolar crest.
What instruments do you need for bite wings? • XCP instruments (horizontal or vertical) • Bitewing tab/loop (horizontal or vertical)
Technique for Bitewings • Vertical angulation of central beam is determined by the occlusal plane • horizontal angulation of the central beam is determined by the orientation of the proximal contact of maxillary premolars or molars
What is the goal of occlusal radiography in adults? To see a relatively large area of the maxilla or mandible, often as a supplemental view.
What instruments do you need for occlusal radiology? Size 4 film, round collimator (no size 4 sensor is available)
Maxillary occlusal view technique 1) Patient’s occlusal plane horizontal to floor 2) central beam centered over Patient’s nose with the inferior edge of cone positioned to cover maxillary central incisors 3) central beam 65 degrees positive to film
Mandibular occlusal view technique 1) Patient’s occlusal plane perpendicular to floor 2) central beam centered over Patient’s mandible with the superior edge of cone positioned to cover mandibular central incisors 3) central beam perpendicular to film
What is the goal of a lateral facial projection? To see the anterior profile of the maxilla or mandible
What instruments do you need for lateral facial projection? Size 4 film, round collimator, tongue blade, Stabe biteblock
Technique for Lateral Facial Projection 1. Size 4 film+Stabe biteblock attached to a tongue blade. 2. Film is placed parallel to the saggital plane next to the Patient’s face 3. Central beam is perpendicular to the film
Created by: brittvac
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