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Intraoral_Radiography_Part_1.pptx for bds
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- 3. Periapical viewsare used to record the crowns, roots, and surrounding bone. Root canal treatment. Assessment of root formation n completion. Assessment of root morphology. Assessment of relationship of roots to various vital structures. Implant site assessment and placement. PERIAPICAL RADIOGRAPH
- 4. Paralleling Angle Technique (LongCone and Right Angle Technique)
- 5. PRINCIPLE The central conceptof the paralleling is that “The x-ray receptor is supported parallel to the long axis of the teeth and the central ray of the x-ray beam is directed at right angles to the teeth and receptor”. Minimizes geometric distortion and presents the teeth and supporting bone in their true anatomic relationship.
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- 7. If the lackof parallelism does not exceed 20, the radiograph is generally acceptable. Place 1 or 2 cotton rolls on bite block. Increase the vertical angulation by 5 to 15 degrees Shallow palate
- 8. For maxilla, placethe film on far side of the film Bony growth For mandible, place film between the tori and tongue
- 9. ADVANTAGES DISADVANTAGES Accuracy Difficult fora beginner Simplicity Discomfort Duplication Patient Compliance
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- 11. The bisecting-angle techniqueis based on a simple geometric theorem, Cieszynski ’ srule of isometry, which states that two triangles are equal when they share one complete side and have two equal angles.
- 12. Receptor ispositioned as close as possible to the lingual surface of the teeth, resting in the palate or in the floor of the mouth. The plane of the receptor and the long axis of the teeth form an angle, with its apex at the point where the receptor is in contact with the teeth. An imaginary line that bisects this angle, direct the central ray of the beam at right angles to this bisector.
- 14. No XCPfilm holder required. Better technique when anatomical variations hinder paralleling tech. Decreased exposure time. Advantages
- 15. To reproduce thelength of each root of a multi-rooted tooth accurately, the central beam must be angled differently for each. Another limitation of this technique is that the alveolar ridge often projected more coronally than its true position, thus distorting the apparent height of the alveolar bone around the teeth. Disadvantages
- 16. Bitewing radiographs include the crowns ofthe maxillary and mandibular teeth and the alveolar crest on the same receptor. Bitewing Radiograph
- 17. interproximal cariesin the early stages. secondary caries below restorations. Overhanging restorations. evaluating the periodontal condition(alveolar bone crest). detecting calculus deposits. INDICATIONS
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- 19. An occlusalradiograph displays a relatively large segment of a dental arch. To localize foreign bodies in the jaws and stones in the ducts. To demonstrate and evaluate the integrity of the outlines of the maxillary sinus. When patients are unable to open the mouth. Help in localization of object. OCCLUSAL RADIOGRAPH
- 20. location, nature,extent, and displacement of fractures of the mandible and maxilla. To determine the medial and lateral extent of disease (e.g., cysts, osteomyelitis, tumors) and to detect disease in the palate or floor of the mouth.
- 21. MAXILLARY ANTERIOR OCCLUSALPROJECTION Image Field Receptor Placement Projection of Central Ray Point of Entry
- 22. Image Field Receptor Placement Projectionof Central Ray Point of Entry MAXILLARY CROSS-SECTION OCCLUSAL PROJECTION
- 23. Image Field Receptor Placement Projectionof Central Ray Point of Entry MAXILLARY LATERAL OCCLUSAL PROJECTION
- 24. Image Field Receptor Placement Projectionof Central Ray Point of Entry MANDIBULAR ANTERIOR OCCLUSAL PROJECTION
- 25. Image Field Receptor Placement Projectionof Central Ray Point of Entry MANDIBULAR CROSS-SECTION OCCLUSAL PROJECTION
- 26. Image Field Receptor Placement Projectionof Central Ray Point of Entry MANDIBULAR LATERAL OCCLUSAL PROJECTION
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