ObjectiveThe objective of this study is to investigate the influence of metal artifact reduction (MAR) on two cone beam computed tomography (CBCT) units in the evaluation of bone graft loss adjacent to titanium (Ti) and zirconium (Zr) implants.Material and MethodsTwelve Ti and twelve Zr implants were placed in the posterior region of dry human mandibles. Bone graft was applied to the level of the cover screw. Bone graft loss was simulated in half of the sample (6 Ti and 6 Zr) by removing the graft material up to the third implant thread on the buccal surface. CBCT images were acquired on two units, varying the application of MAR (OP300—off and on; Eagle 3D—standard, intermediate, and extreme). The images were assessed by five evaluators that scored the presence of graft loss according to a 5‐point scale. The diagnostic values were calculated and compared by non‐parametric tests with a significance level of 5%.ResultsHigher diagnostic values were achieved with MAR activated in the OP300 unit, for Ti and Zr (p < 0.05). On the Eagle 3D unit, MAR in extreme mode resulted in lower diagnostic values for both types of implants (p < 0.05). The diagnostic values of Ti implants were higher than Zr implants (p < 0.05).ConclusionThe application of MAR influences the diagnosis of bone graft loss adjacent to Ti and Zr dental implants. However, the extreme mode of MAR in the Eagle 3D unit can impair the diagnostic task in both types of implants and should be avoided.

中文翻译：

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双锥形束 CT 的金属伪影减少工具对钛和锆植入物周围骨移植物损失检测的影响——一项离体诊断准确性研究


目的本研究的目的是探讨金属伪影减少 （MAR） 对两个锥形束计算机断层扫描 （CBCT） 单元的影响，以评估钛 （Ti） 和锆 （Zr） 植入物附近的骨移植损失。材料和方法将 12 个 Ti 和 12 个 Zr 植入物放置在干燥的人体下颌骨的后部区域。将骨移植物应用于盖螺钉的水平。通过去除移植材料直至颊面上的第三根种植体线，在一半的样本 （6 Ti 和 6 Zr） 中模拟骨移植物损失。在两个单元上采集 CBCT 图像，改变 MAR 的应用（OP300 — 关闭和打开;Eagle 3D - 标准、中级和极高）。这些图像由 5 名评估员评估，他们根据 5 分制对移植物损失的存在进行评分。通过显着性水平为 5% 的非参数检验计算和比较诊断值。结果在 OP300 装置中激活 MAR 后，Ti 和 Zr 的诊断值更高 （p < 0.05）。在 Eagle 3D 单元上，极端模式下的 MAR 导致两种类型植入物的诊断值较低 （p < 0.05）。Ti 种植体的诊断价值高于 Zr 种植体 （p < 0.05）。结论MAR 的应用影响 Ti 和 Zr 种植牙附近骨移植物丢失的诊断。然而，Eagle 3D 单元中 MAR 的极端模式会损害这两种类型的植入物的诊断任务，应避免使用。