reference reading: chapter 19. show interproximal caries show pulp changes show overhangs display...
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Reference reading: Chapter 19 Slide 2 Show interproximal caries Show pulp changes Show overhangs Display improperly fitting crowns Shows recurrent caries beneath restorations Show resorption of alveolar bone Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Is a method used to examine the inter- proximal surfaces of the teeth (where the explorer doesnt reach). Considered a method of preventive dentistry. Is a radiographic exam that is used the most frequently in conjunction with dental exams and cleanings. Slide 14 X-ray beams pass through teeth at a 90 degree angle, which creates a more accurate image of structures. The use of paralleling technique creates the illusion of open contacts, giving the appearance that there are spaces between the teeth. Appears radiolucent (BLACK) Show the crowns of both upper and lower teeth, as well as the supporting alveolar bone, on a single film. Slide 15 Slide 16 The film is placed in the mouth parallel to the crowns of both the upper and the lower teeth The film is stabilized when the patient bites on the bite-wing tab or film holding device. The central ray of the x-ray beam is directed through the contacts of the teeth, using vertical angulation of +10 degrees Slide 17 The Bite-wing tab: this is a sticky tab that is placed on the tube side of the film packet. The patient bites directly on the tab, and therefore establishes a better image because the teeth are fully closed, and there is no bite-block interference. Slide 18 Slide 19 Rinn XCP Bitewing instrument: Just like the Rinn for periapical films, the Rinn bite-wing holder will position the film, stabilize it, and align the PID for a good diagnostic film. Slide 20 Premolar view: angle the PID at +10 degrees vertically; horizontally aim toward center of film, between the premolars and the occlusal plane Center tab on 2 nd premolar Molar view: angle the PID at +10 degrees vertically, horizontally aim at contacts of 1 st and 2 nd molars Center tab on 2 nd molar Slide 21 Slide 22 Slide 23 Slide 24 Slide 25 Slide 26 Size 0 = pediatric patient with primary dentition Size 1 = children with mixed dentition Size 2 = teens and adult patients Size 3 = horizontal bitewings only; not recommended due to overlapped contact results Slide 27 Can be used to examine the level of supporting bone in the mouth. The bite-wing is placed in a vertical, up and down, direction. Mainly used for periodontal patients. Slide 28 A total of 7 projections are used to cover all areas. Slide 29 Slide 30 The whole purpose of the bitewing examination is to see the interproximal areas of the teeth. If horizontal angulation is incorrect, the contacts will be overlapped, and produce a film of poor diagnostic quality. To avoid overlap, direct the CR through the interproximal areas of the teeth. If the vertical angulation is incorrect, the image will be distorted, and also of poor diagnostic quality Slide 31 Slide 32 Slide 33 Slide 34 Edentulous Areas A cotton roll must be placed in the area of the missing teeth to support the bite-wing tab. Failure to support the BW tab results in a tipped occlusal plane on the radiograph. Bony Growths (tori) Mandibular tori may cause a problem in film placement. The film must be placed between the tori and the tongue, not on the tori. Slide 35 BEFORE PLACING FILM IN PATIENTS MOUTH: Set exposure factors (kVp, mA, exposure time) Ask patient to remove all intraoral objects and eyeglasses Check the oral anatomy Tori?Shallow or narrow palate? Limited opening? Attempt to retract cheeks and tongue to gauge difficulty during film placement.