影像学失真对下颌第三磨牙位置及分类影响的临床评估
Clinical evaluation of the effects of radiographic distortion on the position and classification of mandibular third molars.
作者信息
Sant'Ana L F M, Giglio F P M, Ferreira O, Sant'ana E, Capelozza A L A
机构信息
Department of Stomatology, Bauru Dental School, University of São Paulo, Alameda Dr. Octávio Pinheiro Brisolla 9-75; Vila Universitária, Bauru-Sp, Brazil, CEP 17.090-100.
出版信息
Dentomaxillofac Radiol. 2005 Mar;34(2):96-101. doi: 10.1259/dmfr/29844316.
OBJECTIVE
Panoramic radiographs are routinely employed for surgical planning of unerupted third molars. The objective of this study was to evaluate distortions in the position of mandibular third molars on panoramic radiographs.
MATERIALS AND METHODS
Panoramic radiographs of 14 patients with indication for extraction of the mandibular third molars were used. Transurgical impressions of the crowns of the teeth to be extracted and adjacent second molars (n=19) were achieved with addition silicone and poured with type IV plaster for comparison of the inclinations of the third molars on the radiographs and study casts.
RESULTS
There was a mean difference of -5.37 degrees between the position of the third molar on the panoramic radiograph and on the study cast (standard deviation 1.46, P<0.05, Student's t-test).
CONCLUSION
There is distortion in the position of teeth on the panoramic radiograph, which may influence the surgical planning; however, this does not invalidate it as the main tool for diagnosis and surgical planning of mandibular third molars.
目的
全景X线片常用于未萌出第三磨牙的手术规划。本研究的目的是评估全景X线片上下颌第三磨牙位置的畸变情况。
材料与方法
使用14例有下颌第三磨牙拔除指征患者的全景X线片。采用加成型硅橡胶获取待拔除牙齿及相邻第二磨牙（n = 19）牙冠的外科印模，并用IV型石膏灌注，以比较第三磨牙在X线片和研究模型上的倾斜度。
结果
全景X线片上第三磨牙位置与研究模型上第三磨牙位置的平均差异为-5.37度（标准差1.46，P < 0.05，Student t检验）。
结论
全景X线片上牙齿位置存在畸变，这可能会影响手术规划；然而，这并不妨碍其作为下颌第三磨牙诊断和手术规划的主要工具。
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