The Effect of Basis Images and a Metal Artifact Reduction Algorithm on Artifact Expression and Trabecular Bone Architecture in the Vicinity of a Zirconium Dental Implant Placed in Different Mandibular Regions: An Ex Vivo Study.

R C Fontenele, N Oliveira-Santos, Ehl Nascimento, H Gaêta-Araujo, T P Silva, D Q Freitas
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Abstract

Purpose: To investigate the effect of basis images' number (BI) and metal artifact reduction (MAR) on artifact's expression and trabecular bone architecture assessment in a medullary bone area close to a zirconium implant placed in different mandibular regions on CBCT.

Materials and methods: CBCT volumes were acquired using the Picasso Trio unit with a zirconium implant placed individually in either the anterior or posterior mandibular region, both with and without MAR, under two scanning modes: normal (450 BI) and high (720 BI). To measure the standard deviation (SD) of gray values, a region of interest was placed mesial to the zirconium implant fixture area for artifact's assessment. For trabecular bone architecture analysis, a volume of interest was established in the same area. The fractal dimension (FD), connectivity density (Conn. Dn.), trabecular thickness (Tb. Th.), and trabecular spacing were calculated.

Results: The zirconium implant fixture increased the SD of gray values, especially in the posterior region without MAR, while activating MAR reduced these values regardless of the scanning mode (P < .05). The number of BI generally had no impact on SD (P > .05), except in the posterior region without MAR, where the normal scanning mode showed higher SD (P < .05). Implant presence reduced FD and Conn. Dens. in the posterior region, although this effect was less pronounced with MAR enabled (P < .05). In the control group, overall, high scanning mode reduced FD and Conn. Dens (P < .05), with minimal effect on Tb. Th. and Tb. Sp (P > .05).

Conclusions: The zirconium implant fixture increased artifact expression, particularly in the posterior mandibular region without MAR, which also resulted in decreased FD and Conn. Dens. While increasing the number of basis images had little effect on the parameters, MAR minimized artifact expression and the reductions in FD and Conn. Dens.

Values:

基础图像和金属伪影减少算法对下颌不同区域锆牙种植体附近伪影表达和骨小梁结构的影响:一项离体研究。
目的:探讨基像数(BI)和金属伪影还原(MAR)对下颌不同区域植入锆的髓质骨区伪影表达和骨小梁结构评估的影响。材料和方法:在正常(450 BI)和高(720 BI)两种扫描模式下,使用Picasso Trio单元在有或没有MAR的下颌前后区分别放置锆种植体获得CBCT体积。为了测量灰度值的标准偏差(SD),将感兴趣的区域放置在锆种植体固定区域的中间,以进行伪影评估。对于小梁骨结构分析,在同一区域建立了感兴趣的体积。分形维数(FD)、连通性密度(Conn. Dn.)、小梁厚度(Tb. Dn.)),计算小梁间距。结果:锆种植体固定装置使灰度值的SD值升高,尤其是在没有MAR的后区,而激活MAR使灰度值降低(P < 0.05)。BI的数量一般对SD没有影响(P < 0.05),但在没有MAR的后区,正常扫描模式下SD较高(P < 0.05)。植入物存在减少FD和Conn. Dens。尽管在启用MAR后,这种效果不那么明显(P < 0.05)。在对照组中,总体而言,高扫描模式降低了FD和Conn. Dens (P < 0.05),对Tb的影响最小。Th。和结核病。P < 0.05)。结论:锆种植固定物增加了假体表达,特别是在没有MAR的下颌后区,这也导致FD和Conn. Dens减少。虽然增加基图像的数量对参数的影响很小,但MAR最小化了伪影表达以及FD和Conn. Dens的减少。价值观:
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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