摘要
目的利用数字成像曲面体层摄影技术研究颌骨后部解剖标志显现情况,并进行测量,为正颌外科、智齿拔除术和种植义齿的颌骨手术进路、深度等临床治疗方案提供依据。方法选取种植义齿术前数字曲面断层片100例,均采用标准全口曲面体层位投照,进行图像数字化处理,观察颌骨后部解剖标志显现情况并进行测量。结果颏孔前后位置高低及颏孔区下颌骨体高度左右基本一致,42例患者看到颏管影像。磨牙区下颌管与牙根尖距离从前向后逐渐减小,下颌神经管显现率从后向前逐渐降低,下颌管直径左右两侧无明显差异。磨牙区下颌体高度及磨牙区下颌管上缘至牙槽嵴顶的距离从前向后逐渐减小。下颌第三磨牙阻生组中近中倾斜角平均为48.80°,萌生组中近中倾斜角平均为6.84°。阻生组磨牙后间隙比萌生组小,二者之间具有统计学上差异(P<0.05)。萌生组与阻生组磨牙后间隙/牙冠近远中径的平均值分别为1.17、0.62(P<0.05)。萌生组与阻生组牙冠近远中径之间无统计学差异。下颌第三磨牙阻生的发生率与近中倾斜角呈正相关(P<0.05),而与磨牙后间隙呈负相关(P<0.05)。上颌窦显现情况为90%,最大范围向前达到尖牙区,向后达到上颌结节区。结论数字化曲面体层摄影能够获得正颌外科、智齿拔除术及种植义齿足够的颌骨特征信息,为制定治疗方案提供理论依据。
Objective To display the anatomic markers of the mandibular posterior area in digital orthopantomography and to study the approach and depth of extraction of impacted teeth,orthognathic surgery and dental implantation.Methods Standardized digital orthopantomographys were taken for 100 subjects（38 males and 62 females）with an average age of 38.2 years.All X-ray images were taken with sirona orthophos plus DC ceph and were dealt by a digital computer.Anatomic markers of the mandibular posterior area were observed and measured by the computer.Results Position of the mental and foramen height of the mandibular body at the mental foramen area was similar between the two sides;The mandibular canal of 42 patients could be found out in the orthopantomographys.Distance between the mandibular canal and the root point at the mandibular molar area was gradually decreased from front to back.There was no obvious difference between the diameter of the left mandibular canal and that of the right mandibular canal.Both the height of the mandibular body and the distance between the superior margin of the mandibular foraman and the alveolar ridge crest at the molar area were decreased from front to back.No obvious difference was found between the angle of the left mandible and that of the right.The average mesio-angulation of the third molars in the impacted group was 48.80 and that in the erupted group was 6.84.The retromolar space of the impacted groups was significantly smaller than that of the erupted groups（P〈0.05）.The average ratio of space/crown width in the erupted and impacted groups was 1.17 and 0.62（P〈0.05）.No statistical significance was found in the mesiodistal diameter of the tooth crown between the impacted and erupted groups.There was an obvious positive relationship between frequency of the third molar impaction and angulation degree（P〈0.05）,but the former was inversely associated with the retro-molar space（P〈0.05）.The maxillary sinus was 90% displayed and reached the maxillary canine area to the front and the maxillary tuberosity to the back.Conclusion Digital orthopantomography can provide enough information of siagon features for orthognathic surgery,extraction of impacted teeth and dental implantation.
出处
《山东大学学报（医学版）》
CAS
北大核心
2009年第10期122-125,共4页
Journal of Shandong University:Health Sciences
关键词
放射摄影术
牙科
数字
颏孔
下颌管
磨牙
第三
上颌窦
Radiography
dental
digital
Mental foramen
Mandibular canal
Molar
third
Maxillary sinus
