intra-oral tech-errors学会看拍牙课件.ppt
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1、intra-oral tech-errors学会看拍牙,1,Intraoral Technique Errors The following slides identify the most common errors seen when taking intraoral radiographs.,intra-oral tech-errors学会看拍牙,2,Film Placement Errors,Anterior-posterior placement Vertical placement (too far above or below occlusal plane) Film tippi
2、ng,intra-oral tech-errors学会看拍牙,3,Poor film placement. (too ant. for PM, too post. for molar),intra-oral tech-errors学会看拍牙,4,AP,Incorrect film placement,intra-oral tech-errors学会看拍牙,5,Premolar bitewing, too posterior,intra-oral tech-errors学会看拍牙,6,Molar bitewing, too anterior,intra-oral tech-errors学会看拍牙
3、,7,Film tipped,intra-oral tech-errors学会看拍牙,8,Film tipped,intra-oral tech-errors学会看拍牙,9,Film tipped (as patient closed, top edge of film caught palatal gingiva, forcing film down),intra-oral tech-errors学会看拍牙,10, 1/4” of film beyond occlusal,intra-oral tech-errors学会看拍牙,11,Patient not biting on biteblo
4、ck (see next slide). Apices of incisors cut off.,intra-oral tech-errors学会看拍牙,12,Patient not biting on biteblock,intra-oral tech-errors学会看拍牙,13,Cone Cutting,X-ray beam not centered on film, leaving part of film unexposed.,Unexposed part of film (below dotted line),intra-oral tech-errors学会看拍牙,14,Cone
5、Cutting,(paralleling technique),Improper instrument assembly (ring upside down),(side view),intra-oral tech-errors学会看拍牙,15,Cone cutting,intra-oral tech-errors学会看拍牙,16,Cone cutting (bisecting angle technique),intra-oral tech-errors学会看拍牙,17,(bitewing technique),Cone Cutting,intra-oral tech-errors学会看拍牙
6、,18,Cone cutting,intra-oral tech-errors学会看拍牙,19,Overlap (Incorrect horizontal angulation),intra-oral tech-errors学会看拍牙,20,Correct Horizontal Angulation,X-ray beam directed perpendicular to a line connecting the buccal surfaces of the teeth (dotted line below). When using the paralleling instrument, t
7、he film should be parallel to this line.,intra-oral tech-errors学会看拍牙,21,Incorrect Horizontal Angulation,If the x-ray beam is not perpendicular to the line connecting the buccal surfaces of the teeth, overlap between the buccal surface of one tooth and the lingual surface of the adjacent tooth occurs
8、 (see next slide).,intra-oral tech-errors学会看拍牙,22,Overlap (incorrect horizontal),lingual,buccal,intra-oral tech-errors学会看拍牙,23,Overlap of crowns (black arrows) and roots (red arrow),intra-oral tech-errors学会看拍牙,24,All contacts overlapped,intra-oral tech-errors学会看拍牙,25,Generalized overlap,intra-oral t
9、ech-errors学会看拍牙,26,Not a technique error. Overlapped contact (arrow above) is caused by one of the molars being out of normal alignment; all other contact areas are open.,intra-oral tech-errors学会看拍牙,27,Reversed Film,The all-white side of the film should face the teeth. When placing the film in the b
10、iteblock of the paralleling instrument (periapical or bitewing), the all-white side of the film should face the ring. When using stick-on tabs for bitewings, the tabs should be placed on the all-white side of the film.,intra-oral tech-errors学会看拍牙,28,Reversed film. The lead foil, which is embossed wi
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