Ganss C, Hochban W, Kielbassa A M, Umstadt H E
Medizinisches Zentrum für Zahn-, Mund- und Kieferheilkunde, Philipps-Universität Marburg.
Oral Surg Oral Med Oral Pathol. 1993 Dec;76(6):688-93. doi: 10.1016/0030-4220(93)90035-3.
This study was designed to find a threshold value for an increased probability of upper and lower third molar eruption measured on rotational tomograms compared with lateral cephalometric radiographs. Twenty-seven patients had been followed over a 7-year period. Space available in the retromolar region had been measured at mean ages of 13, 16, and 20 years. At early ages, patients with erupted third molars had significantly more space available in the retromolar region. More wisdom teeth had erupted with a space/width ratio > or = 1 measured on rational tomograms and a distance of 25 mm or more on lateral cephalometric radiographs. There was a strong correlation between rotational tomograms and lateral cephalometric radiograph measurements as well as good reliability and reproducibility compared with study casts.
本研究旨在确定一个阈值，以通过旋转断层扫描测量上下第三磨牙萌出概率增加的情况，并与头颅侧位片进行比较。27名患者被随访了7年。在13岁、16岁和20岁的平均年龄时测量了磨牙后区的可用间隙。在早期，第三磨牙已萌出的患者在磨牙后区有明显更多的可用间隙。当旋转断层扫描测量的间隙/宽度比≥1且头颅侧位片上的距离为25毫米或更大时，更多的智齿已萌出。旋转断层扫描与头颅侧位片测量之间存在很强的相关性，并且与研究模型相比具有良好的可靠性和可重复性。
