Establishment of prognostic evaluation of dental implants by standardized digital radiography

标准化数字X线摄影术对牙种植体预后评估的建立

• 批准号: 11671879
• 负责人: HANAZAWA(NISHINO) Tomomi
• 金额: $ 2.3万
• 依托单位: Showa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11671879/
• 关键词: standardized radiography; digital radiography; dental standardized radiography; subtraction radiography; インプラント; デジタルラジオグラフィー

The purpose of this study was to determine the optimal radiation dose and image processing conditions for radiography using a digital radiographic system, develop auxiliary instruments allowing safe, simple, and geometrically reproducible radiography for the assessment of implant outcomes using this digital radiographic system and evaluate the possibility of digital subtraction. Implant fixtures were inserted into molar defects of cadaver mandibular bone, and bone defects (1-3 mm) were produced around the fixture and examined by radiography using a digital radiographic system (Digora) and dental X-ray films (Ektaspeed Plus). The Digora allowed detection of bone defects of 2 mm or more with a radiation time of 0.5 seconds and was superior to the Ektaspeed Plus in terms of sensitivity, specificity, and accuracy. Even after a reduction of the radiation dose to 1/5, the detection ability did not markedly decrease, suggesting that a reduction in dose is possible. As auxiliary instruments for standard radiography, the face-bow transfer used for occlusal registration was improved, and reproducible radiography became possible. For radiography, a direct digital system (CDR) was used, and some types of bone chips were placed in the molar area of dry skulls so as to add bone changes. On each image, subtraction was performed using software for digital subtraction (Emago) with automatic superposition function. Evaluation of images showed a higher accuracy of the CDR than conventional dental films. This method using software for digital subtraction (Emago ) and our new auxiliary instrument may be useful for serial observation of implant outcomes.

本研究的目的是确定使用数字X线摄影系统进行X线摄影的最佳辐射剂量和图像处理条件，开发辅助工具，允许使用该数字X线摄影系统进行安全、简单和几何可再现的X线摄影，以评估植入物结局，并评价数字减影的可能性。将种植体固定装置插入尸体下颌骨的磨牙缺损中，在固定装置周围产生骨缺损（1-3 mm），并使用数字X线摄影系统（迪戈拉）和牙科X线片（Ektaspeed Plus）进行X线摄影检查。迪戈拉允许在0.5秒的辐射时间内检测2 mm或更大的骨缺损，并且在灵敏度、特异性和准确性方面上级Ektaspeed Plus。即使在将辐射剂量减少到1/5之后，检测能力也没有明显降低，这表明剂量的减少是可能的。作为标准X线摄影的辅助仪器，用于咬合配准的面弓转移得到了改进，使可重复的X线摄影成为可能。对于X线摄影，使用直接数字系统（CDR），并将某些类型的骨片放置在干燥颅骨的磨牙区，以增加骨变化。在每张图像上，使用具有自动叠加功能的数字减影软件（Emago）进行减影。图像评价显示CDR的准确性高于传统牙科胶片。使用数字减影软件（Emago）和我们的新辅助仪器的这种方法可能有助于连续观察种植结果。