CAJ | 학술논문

目的：??比较口腔科常用的3种金属和2种陶瓷材料在0.35、1.5及3?T?3种场强磁共振成像（MRI）不同序列中形成伪影的差异。方法??将3种金属和2种陶瓷材料制作成同样大小及厚度的中切牙内冠，将其置入盛满生理盐水的塑料罐体中，分别在0.35、1.5和3.0?T的磁共振（MR）机中扫描获得T1WI、T2WI影像。比较各种材料在不同场强的MR扫描中伪影的差异。结果??氧化锆在3种场强的MR机中扫描无明显伪影；铸造陶瓷伪影极轻微；贵金属合金、烤瓷镍铬合金与烤瓷钴铬合金在3种场强MR扫描中均出现不同程度的伪影。结论??氧化锆、铸造陶瓷这两种常用口腔陶瓷材料基本无伪影或伪影极轻微。贵金属合金、烤瓷镍铬合金与烤瓷钴铬合金3种常用口腔金属材料易引起MRI伪影，且随着主磁体场强增加，伪影面积增大。
목적：??비교구강과상용적3충금속화2충도자재료재0.35、1.5급3?T?3충장강자공진성상（MRI）불동서렬중형성위영적차이。방법??장3충금속화2충도자재료제작성동양대소급후도적중절아내관，장기치입성만생리염수적소료관체중，분별재0.35、1.5화3.0?T적자공진（MR）궤중소묘획득T1WI、T2WI영상。비교각충재료재불동장강적MR소묘중위영적차이。결과??양화고재3충장강적MR궤중소묘무명현위영；주조도자위영겁경미；귀금속합금、고자얼락합금여고자고락합금재3충장강MR소묘중균출현불동정도적위영。결론??양화고、주조도자저량충상용구강도자재료기본무위영혹위영겁경미。귀금속합금、고자얼락합금여고자고락합금3충상용구강금속재료역인기MRI위영，차수착주자체장강증가，위영면적증대。
Objective??To?compare?five?materials?commonly?used?in?dentistry,?including?three?types?of?metals?and?two?types?of?ceramics,?by?using?different?sequences?of?three?magnetic?resonance?imaging?(MRI)?field?strengths?(0.35,?1.5,?and?3.0?T). Methods??Three?types?of?metals?and?two?types?of?ceramics?that?were?fabricated?into?the?same?size?and?thickness?as?an?incisor?crown?were?placed?in?a?plastic?tank?filled?with?saline.?The?crowns?were?scanned?using?an?magnetic?resonance?(MR)?machine?at?0.35,?1.5,?and?3.0?T?field?strengths.?The?T1WI?and?T2WI?images?were?obtained.?The?differences?of?various?materials?in?different?artifacts?of?field?MR?scans?were?determined.?Results??The?zirconia?crown?presented?no?significant?artifacts?when?scanned?under?the?three?types?of?MRI?field?strengths.?The?artifacts?of?casting?ceramic?were?minimal.?All?dental?precious?metal?alloys,?nickel-chromium?alloy?dental?porcelain,?and?cobalt-chromium?ceramic?alloy?showed?varying?degrees?of?artifacts?under?the?three?MRI?field?strengths.?Conclusion??Zirconia?and?casting?ceramics?present?almost?no?or?faint?artifacts.?By?contrast,?precious?metal?alloys,?nickel-chromium?alloy?dental?porcelain?and?cobalt-chromium?ceramic?alloy?display?MRI?artifacts.?The?artifact?area?increase?with?increasing?magnetic?field.