摘要
目的 研究不同修复方式对不同面积楔状缺损抗折强度的影响。方法 60颗下颌第一前磨牙随机分成6组,制备两种缺损面积的蝶形缺损,其中A1、B1组充填树脂作为对照,A2、A3和B2、B3按缺损面积在1/3以内、大于1/3小于轴角和桩核、桩核冠修复分组。进行10000次人工老化处理后,采用万能材料试验机垂直加载,记录最大载荷数值并分析折裂模式。结果 当缺损面积<1/3时,A1(935.24±50.21)N与A2(950.53±61.23)N、A3(943.35±23.48)N抗折强度差异无统计学意义,当缺损面积>1/3且小于轴角时,B1(867.38±45.79)N与B2(903.20±43.08)N,B3(920.52±82.98)N间差异有统计学意义,B2与B3间差异无统计学意义。除B2与B1、B3之间折裂模式有差异外,其余无差异。结论 当缺损面积<1/3时,直接树脂充填即可,当缺损面积>1/3小于轴角时,可增加纤维桩来进一步提高抗折强度。全冠修复可能会导致不可修复性折裂的发生,是否制作全冠应慎重决定。
Objective To compare the effects of different repair methods on different types of wedge-shaped defects.Methods Sixty mandibular first premolars were divided into six groups.The fracture resistance and failure patterns after thermo-cycling(10000 times)were compared.Results There was no statistical differences in fracture resistance among group A1(935.24±50.21)N,A2(950.53±61.23)N and A3(943.35±23.48)N,but the differences among group B1(867.38±45.79)N,B2(903.20±43.08)N and B3(920.52±82.98)N were significant.There were significant differences in failure pattern among B2,B1 and B3.Conclusions When the wedge defect area is less than 1/3,direct resin filling can achieve good repair effect.when the wedge defect area is more than 1/3 but does not exceed the axial angle,fiber post can be added to further improve fracture resistance.
作者
崔玉兰
赵琛
张钊
刘博宇
CUI Yu-lan;ZHAO Chen;ZHANG Zhao;LIU Bo-yu(Department of Prosthodontics,School and Hospital of Stomatology,Hebei Medical University,Shijiazhuang 050017,China)
出处
《北京口腔医学》
CAS
2024年第1期1-4,共4页
Beijing Journal of Stomatology
基金
河北省卫生健康委医学科学研究课题(20210097)。
关键词
楔状缺损
纤维桩
前磨牙
抗折强度
Wedge-shaped defect
Fiber post
Premolar
Fracture resistance
