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Published bySabina Morrison Modified over 9 years ago
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Resource Reading: Chapter 17 – pp. 158 – end of chapter
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In the anterior area, the size 1 film is used and always placed in a VERTICAL direction. In the posterior area, the size 2 film is used and is always placed in a HORIZONTAL direction.
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There are 5 Basic rules: ◦ Receptor Placement ◦ Receptor Position ◦ Vertical Angulation ◦ Horizontal Angulation ◦ Film Receptor Exposure
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Anterior Film Placements Place the film directly behind the teeth you are trying to capture. Maxillary canine – A Maxillary Central and lateral incisors – B Mandibular canine – C Mandibular lateral and central incisors - D
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Posterior Placement Place the film directly behind the teeth you are trying to capture. Maxillary premolar shot – A Maxillary molar shot – B Mandibular premolar shot – C Mandibular molar shot - D
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An easy way to tell if the film is placed correctly is to make sure that the bite block is projecting out over/under the occlusal or incisal surfaces of the the teeth you are trying to capture.
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The receptor must be positioned to the long axis of the tooth. The receptor and XCP must be positioned away from the teeth and toward the middle of the oral cavity. The mandibular molars are the only exception to this.
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The central ray should be directed perpendicular (at a right angle) to both film and tooth. Vertical angulation refers to the “up & down” movement of the cone.
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The central ray of the x-ray beam must be directed through the contact areas of the teeth. Horizontal angulation refers to the “left to right” movement of the cone.
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The end of the cone MUST line up with the placement ring of the of the Rinn.
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Failure to do so will result in what is called a “conecut”. This concept will discussed more later in the course (Chapter 20)
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