摘要
目的:探寻能使X线根尖片上清晰显示下颌第一磨牙全部根管的最佳投照角度,为临床治疗提供完全且准确的信息。方法:选取需行根管治疗且扩大针探查具有4个根管的下颌第一磨牙120例。每颗牙均拍摄诊断丝偏移投照片,拍摄角度分别为远中20°、远中10°、0°、近中10°、近中20°、近中30°。由3位观察者独立读片,诊断牙根内的根管数目及根尖清晰度。采用SPSS9.0软件包进行配对计数资料的χ2检验。结果:近中30°对4根管的区分率为93.3%,近中20°对4根管的区分率为90.0%,均显著高于常规0°投照的40%(P<0.01)。近中30°和近中20°所拍X线片的清晰度分别为71.5%和89.7%,后者与0°投照片的清晰度(95.0%)相比,无显著差异(P>0.05)。结论:近中20°偏移投照能更好地显示下颌第一磨牙的4个根管。
PURPOSE： This study was aimed to determine the most effective horizontal beam angulation to identify 4 canals in the mandibular first molars,so as to provide full and accurate information for the clinic.METHODS： One hundred and twenty mandibular first molars with four canals that needed endodontic treatment in vivo were selected.Radiographs were taken at horizontal angles of 0,10,20 degrees from distal direction and 0,10,20,30 degrees from mesial direction of the tooth.The numbers of root canal and the degree of resolution were identified and recorded by 3 independent observers.Data were analyzed using SPSS10.0 software package or Chi-square test.RESULTS： At 30 and 20 degrees from mesial direction,93.3% and 90.0% of all the 120 teeth were correctly identified as 4 canals,compared with 0 degree of 40.0%（P0.01）.Of them,71.5% and 89.7% could be classified as with high resolution,respectively.The latter was not significantly lower than 0 degree of 95.0%（P0.05）.CONCLUSION： Twenty degrees from mesial direction is the most effective X-ray beam angle in diagnosing 4 canals of the first mandibular molars.
出处
《上海口腔医学》
CAS
CSCD
2010年第4期354-358,共5页
Shanghai Journal of Stomatology
基金
上海市科学技术委员会资助项目(08DZ2271100)~~
关键词
下颌第一磨牙
X线牙片
偏移投照角度
区分根管
水平角固定器
The first mandibular molar
X-ray film
Beam angulation
Multiple canals identification
Beam alignment device
