摘要
目的研究改良型颊牙合高嵌体修复深度楔状缺损的抗折能力。方法将30颗离体下颌前磨牙,随机分为3组,制备深度楔状缺损模型(缺损未达轴角):A组纤维桩+树脂充填,B组采用纤维桩+全瓷冠,C组采用纤维桩+改良型颊牙合高嵌体。进行冷热循环处理5000次(5℃/55℃),包埋后用万能材料试验机在颊尖顶加载,方向与牙体长轴呈150°,记录折裂力值,并比较折裂模式。结果折裂力值:A组(707.39±35.75)N,B组(1023.24±46,21)N,C组(902.53±61.23)N,A组小于B、C两组(P<0.05),B与C组差异无统计学意义(P>0.05)。折裂模式A组多为Ⅲ类,B组多为Ⅵ类,C组多为Ⅱ类(P<0.05)。结论改良型颊牙合高嵌体与全瓷冠抗折强度均能达到临床需求,但更加微创,且多为可修复型折裂,可在临床试行开展。
Objective To investigate the fracture resistance of modified buccal-occlusal onlay in restoring the deep wedge-shaped defect.Methods Thirty mandibular premolars were randomly divided into 3 groups.The deep wedgeshaped defects,which did not reach the axial angle were prepared.Group A(fiber post+resin filling),group B(fiber post+crown),group C(fiber post+modified buccal-occlusal onlay)were subjected to thermo-cycling for 5000 times(5℃/55℃).After embedding,the universal material testing machine was used to load the teeth with 150°to the teeth axis on the buccal cusp until any crack appeared.The value was recorded and the modes were compared.Results Group A was(707.39±35.75)N,group B(1023.24±46.21)N,and group C(902.53±61.23)N.Group A was significantly lower than that of group B and C(P<0.05),while there was no statistical difference between group B and C(P>0.05).In fracture mode group A was dominated by classⅢ,group B was classⅣand group C was classⅡ(P<0.05).Conclusions The fracture resistance of modified buccal-occlusal onlay and crown both meet the clinical requirements.However,the former is more minimally invasive and more likely to be repaired after failure.
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
2023年第4期247-250,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
深度楔状缺损
改良型颊牙合高嵌体
纤维桩
抗压载荷
Wedge-shaped defect
Modified buccal-occlusal onlay
Fiber posts
Fracture resistance
