固化光源强度对双固化树脂粘结纤维桩强度的影响

摘要

目的：研究不同光源强度对双固化树脂粘结纤维桩固位力的影响。方法30颗离体前磨牙，截冠，预备根管，根管充填， BISCO Duo － link 双固化粘结剂将BISCO DT light post 纤维桩粘固。按纤维桩粘结时使用的固化光源强度不同分成3组：空白组不使用固化光源；低强度组使用600 MW ／ cm2 LED 强度固化光源；高强度组使用1200 MW ／ cm2 LED 强度固化光源。沿垂直纤维桩长轴方向将牙根切成1 mm 薄片，行薄片推出实验，记录推出力量，计算粘结强度。结果粘结强度：空白组＜低强度组＜高强度组。空白组、高强度组各自不同深度粘结强度无差别；低强度组粘结强度：根尖＜根中＜根颈。结论使用双固化树脂粘结剂粘结纤维桩时，固化光源强度增加，有利于增强不同深度粘结剂与桩的粘结强度，增加树脂粘结纤维桩的固位力。%Objective To verify the influence of different light intensities on the bond strength of fiber posts cemented with dual-cured resin cement. Methods 30 crownless human premolars were prepared. Fiber posts were inserted using dual-cured cement and were randomly divided into 3 groups(n = 10):control group:no use of curing light source;low intensity group:the use of 600 MW / cm2 LED curing light intensity;high strength group:the use of 1 200 MW / cm2 LED curing light intensity. After one week,each root was sectioned transversally into three slices (cervical,middle and apical)and the bond strength of each section was determined using a push-out bond strength test. Results The bond strength:blank group < low intensity group < high intensity group. There was no differ-ence in the bond strength from cervical to apical thirds in the blank group and the high intensity group,while in the low intensity group bond strength :cervical > middle > apical. Conclusions When using a dual-cured cement,the bond strength of fiber post was influ-enced by the strength of curing light intensity. With the increase of curing light source intensity,the bond strength of fiber post also in-creased.