Dalzell O, Haghighi P, Ho J, Rayner T, Vidarsson L, Garisto G A
Department of Dentistry, Hospital for Sick Children, Toronto, ON, Canada.
Private Practice, Perth, WA, Australia.
Eur Arch Paediatr Dent. 2025 Feb;26(1):109-117. doi: 10.1007/s40368-024-00971-x. Epub 2024 Nov 13.
The purpose of this study was to investigate and compare in vitro the influence of preformed metal crowns (PMC) versus zirconia crowns (ZC) on the extent of artifact formation and the diagnostic quality of magnetic resonance imaging (MRI).
Standard crown tooth preparations were performed on Typodont models. PMC and ZC were cemented on all primary molar teeth (n = 8) of the respective models. MRI scans were taken for the Typodont alone (control), PMC, and ZC, using a 3 T MRI machine and common MRI sequences. The diameter of image distortion was measured around the dental materials. Data was analyzed using a mixed model analysis.
The average artifact size for PMC was 54.9 mm (range 19.6-110.7 mm) and 12.8 mm (range 5.5-20.7 mm) for ZC. The artifact size was associated with the MRI pulse sequence and dental material, with PMC showing larger artifact diameters than ZC for all MRI sequences (p < 0.001). The control had sensitive sequences for AxT2* and DWI sequences with MRI artifacts of 11.4 mm and 10.7 mm, respectively.
It is important that dentists are aware of the potential of dental materials to cause unfavourable MRI artifacts. When areas of the brain requiring MRI preclude the use of PMC, ZC may be considered as an alternative to extractions. Further clinical studies are required to evaluate the impact of dental materials on the image quality of MR scans in vivo.
本研究旨在体外研究并比较预成金属冠（PMC）与氧化锆冠（ZC）对伪影形成程度及磁共振成像（MRI）诊断质量的影响。
在Typodont模型上进行标准的冠修复体牙体预备。将PMC和ZC分别粘结在各自模型的所有乳磨牙上（n = 8）。使用3T MRI机器和常用的MRI序列，对单独的Typodont模型（对照）、PMC和ZC进行MRI扫描。测量牙科材料周围图像失真的直径。采用混合模型分析对数据进行分析。
PMC的平均伪影大小为54.9毫米（范围19.6 - 110.7毫米），ZC为12.8毫米（范围5.5 - 20.7毫米）。伪影大小与MRI脉冲序列和牙科材料有关，在所有MRI序列中，PMC的伪影直径均大于ZC（p < 0.001）。对照在AxT2*和DWI序列中有敏感序列，MRI伪影分别为11.4毫米和10.7毫米。
牙医必须意识到牙科材料可能导致不利的MRI伪影。当需要进行MRI检查的脑部区域不能使用PMC时，可以考虑用ZC替代拔牙。需要进一步的临床研究来评估牙科材料对体内MR扫描图像质量的影响。
