CAJ | 학술논문

目的：观察4种金属铸造冠磁共振成像（MRI ）检查时所产生金属伪影。方法：给实验犬依次佩戴钴铬合金、低钛合金、镍铬合金、纯钛4种试验铸造冠（右上第二前磨牙），分别进行常规3．0 T 6个序列及1．5 T 4个序列磁共振头部扫描，测量4种铸造冠所产生的伪影的最大面积和伪影涉及图像的层数。结果：2种场强下钴铬合金铸造冠所产生的伪影面积最大（P＜0．01）；1．5 T场强下其他3种合金冠之间差异均无显著性（P＞0．05）；3．0 T场强下镍铬合金冠伪影大于低钛合金冠和纯钛冠（P＜0．05）；低钛合金冠与纯钛冠差异无显著性（P＞0．05）。在2种场强下和全部扫描序列中，伪影涉及的图像层数均以钴铬合金冠的最多，纯钛金属冠最少，其余2种合金冠相同。结论：钴铬合金伪影程度最大，镍铬合金和低钛合金次之，纯钛在4种金属中伪影程度最小。
목적：관찰4충금속주조관자공진성상（MRI ）검사시소산생금속위영。방법：급실험견의차패대고락합금、저태합금、얼락합금、순태4충시험주조관（우상제이전마아），분별진행상규3．0 T 6개서렬급1．5 T 4개서렬자공진두부소묘，측량4충주조관소산생적위영적최대면적화위영섭급도상적층수。결과：2충장강하고락합금주조관소산생적위영면적최대（P＜0．01）；1．5 T장강하기타3충합금관지간차이균무현저성（P＞0．05）；3．0 T장강하얼락합금관위영대우저태합금관화순태관（P＜0．05）；저태합금관여순태관차이무현저성（P＞0．05）。재2충장강하화전부소묘서렬중，위영섭급적도상층수균이고락합금관적최다，순태금속관최소，기여2충합금관상동。결론：고락합금위영정도최대，얼락합금화저태합금차지，순태재4충금속중위영정도최소。
Objective:To observe the artifacts produced by dental metal crown made from different materials on magnetic resonance imaging (MRI).Methods:Mental crows made from Co-Gr,Ni-Gr,low-Ti alloy and Pure-Ti were respectively fabricated for upper right second premolar of a ripe crossbreed dog.The 4 different casting crowns were respectively put on experimental tooth and head MRI scan was carried out with 4 sequences of 1.5 T and 6 sequences of 3.0 T MRI respectively.The existence and extent of the arti-facts were assessed and compared.Results:On both 1.5 T and 3.0 T MRI,the Go-Gr alloy crown exhibited significantly wider arti-facts than the others (ANAVO analysis,P<0.01).There were no significant differences among Ni-Gr,low-Ti alloy and Pure-Ti on 1.5 T MRI(P>0.05).On 3.0 T MRI the artifacts produced by Ni-Gr was larger than that by low-Ti alloy or Pure-Ti(P<0.05,be-tween low-Ti alloy and pure-Ti,P>0.05).By any of the test sequence either on 1.5 T or on 3.0 T,the Co-Gr alloy produced arti-facts in the most slices of MRI imaging and Pure-Ti in the least.Conclusion:Go-Gr alloy may produce larger artifacts than Ni-Gr, low-Ti alloy and Pure-Ti on MRI.