CAJ | 학술논문

目的：评价微波烧结和常规烧结牙科氧化锆的加速老化性能。方法：制作 cercon 氧化锆圆片48片并随机均分成2组，对照组（C 组）采用常规烧结，实验组（M组）采用微波烧结，将 C 组和 M组各分成2组，CA 组、MA 组试件在室温下干燥存放，CB 组、MB 组试件134℃、0．2 MPa 压力加速老化处理5 h。X 射线衍射（XRD）分析观察氧化锆单斜晶相（m 相）含量的改变、测试双轴弯曲强度，SEM观察试件断裂面微观形貌。结果：CB 和 MB 组氧化锆 m 相含量高于 CA 和 MA 组（P ＜0．05）；SEM结果显示微波二次烧结氧化锆晶粒均匀细小，2种方法烧结的氧化锆试件在加速老化前后断裂面微观结构显示晶粒没有明显增大，未发现裂纹；4组氧化锆双轴弯曲强度差别无统计学意义（P ＞0．05）。结论：微波烧结氧化锆加速老化后性能与常规烧结氧化锆材料相当。
목적：평개미파소결화상규소결아과양화고적가속노화성능。방법：제작 cercon 양화고원편48편병수궤균분성2조，대조조（C 조）채용상규소결，실험조（M조）채용미파소결，장 C 조화 M조각분성2조，CA 조、MA 조시건재실온하간조존방，CB 조、MB 조시건134℃、0．2 MPa 압력가속노화처리5 h。X 사선연사（XRD）분석관찰양화고단사정상（m 상）함량적개변、측시쌍축만곡강도，SEM관찰시건단렬면미관형모。결과：CB 화 MB 조양화고 m 상함량고우 CA 화 MA 조（P ＜0．05）；SEM결과현시미파이차소결양화고정립균균세소，2충방법소결적양화고시건재가속노화전후단렬면미관결구현시정립몰유명현증대，미발현렬문；4조양화고쌍축만곡강도차별무통계학의의（P ＞0．05）。결론：미파소결양화고가속노화후성능여상규소결양화고재료상당。
Objective:To observe the effects of aging performance on the property of dental zirconia sintered by microwave furnace and conventional furnace.Methods:48 zirconia wafer specimens were fabricated and randomly divided equally into 2 groups.The samples were sintered in a microwave furnace(Mgroup)and a conventional furnace(C group)respectively.The samples from the 2 groups were divided into 2 sub-groups and treated by room temperature and dry condition(A group)and 1 34 ℃ with 0.2 MPa pres-sure(B group,accelerated aging)respectively.The m phase fraction of the samples was determined by X-ray diffraction analysis.The biaxial flexural strength was examined by universal testing machine.The fracture cross section was observed by SEM.Results:CB and MB groups showed higher m phase fraction than CA and MA groups(P <0.05).The grain size of zirconia sintered by microwave method was uniform.The fracture surface of zirconia showed no obvious crack and no grain size change after accelerated aging.The biaxial flexural strength of the samples showed no significant difference among groups(P >0.05).Conclusion:The aging perform-ance of zircinia sintered by microwave method were similar to that sintered by conventional method.