intraoraltecherrors学会看拍牙片.ppt

上传人:王** 文档编号:468848 上传时间:2023-09-08 格式:PPT 页数:54 大小:6.85MB
下载 相关 举报
intraoraltecherrors学会看拍牙片.ppt_第1页
第1页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第2页
第2页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第3页
第3页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第4页
第4页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第5页
第5页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第6页
第6页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第7页
第7页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第8页
第8页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第9页
第9页 / 共54页
intraoraltecherrors学会看拍牙片.ppt_第10页
第10页 / 共54页
亲,该文档总共54页,到这儿已超出免费预览范围,如果喜欢就下载吧!
资源描述

《intraoraltecherrors学会看拍牙片.ppt》由会员分享,可在线阅读,更多相关《intraoraltecherrors学会看拍牙片.ppt(54页珍藏版)》请在优知文库上搜索。

1、 Intraoral Technique ErrorsThe following slides identify the most common errors seen when taking intraoral radiographs.Film Placement ErrorsAnterior-posterior placementVertical placement(too far above or below occlusal plane)Film tipping Poor film placement.(too ant.for PM,too post.for molar)APIncor

2、rect film placementPremolar bitewing,too posteriorMolar bitewing,too anteriorFilm tippedFilm tippedFilm tipped(as patient closed,top edge of filmcaught palatal gingiva,forcing film down)1/4”of film beyond occlusalPatient not biting on biteblock(see next slide).Apices of incisors cut off.Patient not

3、biting on biteblock ConeCutting X-ray beam not centered on film,leaving part of film unexposed.Unexposed part of film (below dotted line)ConeCutting(paralleling technique)Improper instrument assembly(ring upside down)(side view)Cone cuttingCone cutting(bisecting angle technique)(bitewing technique)C

4、oneCutting Cone cutting Overlap(Incorrect horizontal angulation)Correct Horizontal AngulationX-ray beam directed perpendicular to a line connecting the buccal surfaces of the teeth(dotted line below).When using the paralleling instrument,the film should be parallel to this line.Incorrect Horizontal

5、AngulationfilmIf 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(see next slide).Overlap(incorrect horizontal)lingualbuccalOverlap of crowns(black arrows)a

6、nd roots(red arrow)All contacts overlappedGeneralized overlapNot 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.Reversed FilmThe all-white side of the film should face the teeth.When placing the film in t

7、he biteblock 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.Reversed film.The lead foil,which is embossed with a pattern and is normally behin

8、d the film when positioned properly,is now in front of the film,producing the tire-track pattern seen on the left side of the film.The film is also lighter than it should be.Vertical Angulation ErrorsResults in an image of the tooth that is longer or shorter than the actual tooth.Primarily seen when

9、 using the bisecting angle technique.Elongation ElongationNot enough vertical angulation.(The black arrow points to the end of tooth image;the white lines represent the actual length of the tooth).Foreshortening ForeshorteningToo much vertical angulation.(The arrow points to the end of the tooth;the

10、 white lines represent the actual length of the tooth).Double ExposureCaused by inadvertently using the same film to expose two different areas of the mouthDouble exposureDouble exposure Patient MovementResults in a blurring or apparent double image of the teeth and surrounding structures.Slight mov

11、ement of the tubehead,in the absence of patient movement,will not affect the images on the film.Patient movement.Images of all structures on film are blurred.Patient or film movement.Patient may have opened mouth slightly during the exposure,allowing the film to move and creating the double image.(M

12、ay be confused with double exposure).Patient movement(see explanation on previous slide).Failure to removeappliances,glassesFailure to remove glassesFailure to remove partial dentureMiscellaneous errorsExposure levelsoverexposure (too dark)underexposure (too light)just right Film bending Most freque

13、ntly caused by placing the finger in an unsupported area while using the bisecting angle technique.Most obvious in canine region on this film,where root curves off of film.Note hypercementosis on root of second premolar(first premolar is missing).Excessive film softening(black lines)PIDBeam directed

14、 through top of thyroid collar.Beam blocked by collar;bottom of film unexposed.Finger in path of x-ray beam(arrow),between PID and film.Unnecessary Films (film 1 of 2)Premolar bitewing shows all teeth on right side film 2 of 2Molar bitewing not needed(edentulous area will be seen on periapical or pan)Bitewing of denture teeth.This film is unnecessary,unless you plan to restore these teeth.

展开阅读全文
相关资源
猜你喜欢
相关搜索

当前位置:首页 > 管理/人力资源 > 咨询培训

copyright@ 2008-2023 yzwku网站版权所有

经营许可证编号:宁ICP备2022001189号-2

本站为文档C2C交易模式,即用户上传的文档直接被用户下载,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有。装配图网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私,请立即通知装配图网,我们立即给予删除!