Diagnostic imaging for conjecture and assessment of prognosis in dental implant treatment

1)影像学诊断在牙种植治疗预后预测中的应用我们建立了一种在重建CT图像上测量无牙槽突的方法，用于牙种植治疗预后预测。83例患者（男34例，女49例）进行了CT检查。结果表明：无牙颌牙槽突的倾斜角在中切牙区和侧切牙区相似，而尖牙区较大。中切牙区无牙槽突的高度和宽度较大。中切牙区牙槽突的倾斜角、高度和高度的测量值可以成为推测牙种植失败的因素。2）牙种植治疗预后评估的诊断成像我们评估了使用全景断层扫描进行牙种植术后诊断成像的有用性。在总共15个牙种植体的位置，进行了全景X线摄影和横断面X线摄影，我们在每张X线照片中评估了牙种植体周围的骨变化。结果如下：在全景X线摄影的15个部位中，7个部位观察到骨改变。在横断面断层片上，可以评价颊舌侧的骨变化。此外，仅在两个牙种植部位的横断面断层扫描上观察到骨变化。虽然15个种植牙中有12个种植牙在断层扫描上与邻近种植牙的阻塞性阴影重叠，但这并不严重干扰诊断，我们认为使用全景机的断层扫描在诊断成像中是有用的，以评估种植牙治疗的预后。

1) Diagnostic imaging for conjecture of prognosis in dental implant treatmentWe established a method to measure the edentulous alveolar process on reformatted CT images for conjecture of prognosis in dental implant treatment. CT images of 83 patients (34 males and 49 females) were examined. The results were as follows ;The angle of inclination of the edentulous alveolar process was similar in the central and lateral incisor regions, but that in the canine region was larger. The height and width in the edentulous alveolar process of the central incisor region were large. The measurement values of the angle of inclination, height and which in the edentulous alveolar process of the central incisor region are able to become the factors for the conjecture of prognosis.2) Diagnostic imaging for assessment of prognosis in dental implant treatmentWe assessed the usefulness of cross-sectional tomography using a panoramic in postoperative diagnostic imaging of dental implants.In the site of a total of 15 dental implants, panoramic radiography and cross-sectional radiography were performed, and we evaluated the bone change surrounding the dental implant in each radiograph. The results were as follows ;Bone change was seen in 7 of 15 sites on panoramic radiography. On cross-sectional tomograms, bone change could be evaluated bucco-lingually. Moreover, the bone change was seen only on cross-sectional tomography in two dental implant sites. Although the image of objective dental implants on cross-sectional tomography were superimposed obstructive shadows from the neighboring dental implants in 12 of 15 dental implant sites, they did not seriously disturb the diagnoses.We believe the cross-sectional tomography using a panoramic machine is useful in diagnostic imaging for assessment of prognosis of dental implant treatment.