CAJ | 학술논문

目的：??用循环加载的方式模拟核桩冠修复一段时间后的状况，比较不同桩核修复后牙体的抗折强度，了解其远期修复效果。方法??15颗下颌离体前磨牙随机分为3组，分别为铸造金属桩核组（A组）、玻璃纤维加强复合树脂桩核组（B组）、树脂充填组（C组），每组5个试件。所有试件在完成桩核修复后均做金属冠修复，经过300?000次循环加载和1?000次5~55?℃冷热循环后，再在力学测试机上测试试件的抗折强度，记录试件断裂时的力值和试件破坏形式。结果??B组和C组抗折强度显著高于A组（P<0.05）。A组主要为不可修复性折裂，其他两组主要为可修复性折裂。结论??临床修复残根残冠时，可以优先考虑纤维桩加树脂核修复或者树脂充填修复。
목적：??용순배가재적방식모의핵장관수복일단시간후적상황，비교불동장핵수복후아체적항절강도，료해기원기수복효과。방법??15과하합리체전마아수궤분위3조，분별위주조금속장핵조（A조）、파리섬유가강복합수지장핵조（B조）、수지충전조（C조），매조5개시건。소유시건재완성장핵수복후균주금속관수복，경과300?000차순배가재화1?000차5~55?℃랭열순배후，재재역학측시궤상측시시건적항절강도，기록시건단렬시적력치화시건파배형식。결과??B조화C조항절강도현저고우A조（P<0.05）。A조주요위불가수복성절렬，기타량조주요위가수복성절렬。결론??림상수복잔근잔관시，가이우선고필섬유장가수지핵수복혹자수지충전수복。
Objective??This?study?aims?to?compare?the?fracture?resistance?of?teeth?restored?with?different?post?and?core?systems?by?cyclic?loading?test?and?to?predict?long-term?effects. Methods??A?total?of?15?recently?extracted?mandibular?premolars?without?crowns?were?endodontically?treated.?The?teeth?were?randomly?divided?into?three?groups?with?five?teeth?in?each?group.?Group?A,?teeth?restored?with?cast?metal?post?and?core.?Group?B,?teeth?with?fiber?post?and?resin?core.?Group?C,?teeth?with?resin?filling.?All?of?the?teeth?were?restored?with?full-cast?metal?crowns.?The?specimens?were?exposed?to?300?000?cyclic?loadings?in?a?cyclic?loading?machine?and?1?000?thermal?cycles?between?5?and?55?℃.?All?of?the?samples?were?loaded?in?AG-IS?mechanical?testing?machine?with?a?compressive?load?until?fracture?occurred.?The?fracture?load?and?the?fracture?mode?of?each?tooth?were?recorded.?Results??The?fracture?resistance?in?group?B?and?C?were?higher?than?that?of?the?cast?metal?post?and?core?restoration?(P<0.05).?Repairable?fractures?were?observed?in?group?B?and?C,?whereas?unrestorable?and?catastrophic?fractures?were?found?in?group?A.?Conclusion??Fiber?post?and?resin?filling?is?a?good?choice?to?restore?endodontically?treated?teeth.