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

1)种植体治疗预后推测的影像诊断我们建立了一种在CT图像上测量无牙牙槽突的方法，用于种植体治疗预后的推测。对83例患者(男34例，女49例)进行了CT检查。结果表明：中、侧切牙区无牙牙槽突倾角相近，尖牙区倾斜角较大。中切牙无牙牙槽突的高度和宽度均较大。对15颗种植体进行全景X线片和横断面X线片检查，对种植体进行全景断层扫描，评价其在种植体术后诊断中的价值。结果显示：15个部位中有7个部位有骨质改变。在横断面断层图上，可以从口腔舌面上评估骨骼的变化。此外，只有在两个牙种植部位的横断面断层扫描才能看到骨的变化。虽然在15个种植区中，12个种植区的横断面图像上有来自邻近种植体的遮挡阴影，但它们并没有严重干扰诊断。我们相信，使用全景机的断层扫描在诊断影像中是有用的，以评估种植体治疗的预后。

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.