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作 者:柴媛[1] 袁慎坡[1] 林红[1] 孙志辉[1] 牛光良
机构地区:[1]北京大学口腔医学院·口腔医院,材料研究室口腔数字化医疗技术和材料国家工程实验室,口腔数字医学北京市重点实验室,北京100081 [2]北京市中西医结合医院口腔科,北京100039
出 处:《牙体牙髓牙周病学杂志》2016年第12期716-720,共5页Chinese Journal of Conservative Dentistry
基 金:首都卫生发展科研专项项目(2014-2-7041)
摘 要:目的:探讨不同化学蚀刻剂对3种玻璃纤维桩表面形貌和弯曲强度的影响。方法:分别取POPO、ParaPost@TaperLux、GLASSIX3种纤维桩各40支,并根据不同表面处理将其各随机分为5组(n=8):组1为对照组,不做任何特殊处理;组2为过氧化氢(H2O2)处理组,用240mL/L的H2O4液浸泡纤维桩10min;组3为氢氟酸(HF)处理组,用96mL/L的HF浸泡纤维桩15s;组4为高锰酸钾(KMnO4)处理组,用126.56mmol/L的KMnO。浸泡纤维桩10rain;组5为二氯甲烷(CH2Cl2)处理组,用CH2Cl2浸泡纤维桩15s。表面处理结束后,用扫描电镜观察各组纤维桩的表面形貌,并用万能材料试验机测试其三点弯曲强度。结果:3种纤维桩经4种化学蚀刻剂处理后,其表面的树脂基质均有不同程度的溶解,特别是HF组,不仅树脂基质被溶解,其表层的纤维也有一定程度的破坏,并可见少量纤维断裂。其弯曲强度明显低于对照组,其中以HF组的弯曲强度最低,POPO、GLASSIX纤维桩经HF处理后,其弯曲强度均低于其他处理组(P〈0.05);同种处理组内不同纤维桩相比,均以POPO纤维桩的弯曲强度最高。结论:采用4种化学蚀刻对3种纤维桩进行表面处理时,均可使其三点弯曲强度明显下降。化学蚀刻剂对纤维桩表面树脂基质的溶解作用是造成纤维桩三点弯曲强度降低的主要原因。AIM: To evaluate the effects of different chemi6al etching agents on the surface morphology and flexural strength of fiber posts. METHODS : 40 glass fiber posts of POPO, ParaPost Taper Lux and GLASSIX were respectively divided into 5 groups (n = 8) and treated by nothing (Gr 1, the control), 240 mL/L H202 for 10 min (Gr 2), 96 mL/L hydrofluoric acid (HF) for 15 s (Gr 3 ), 126.56 mmol/L KMn04 for 10 min( Gr 4) and CH2 C12 for 15 s (Gr 5) respectively. Surface morphology was observed with an scanning electron microscope and three- point flexural strength was tested with a universal test machine after different treatments. Data of bending strength were analyzed using ANOVA and LSD test. RESULTS: The fiber posts was dissolved by chemical etching in all test groups. HF acid etching showed not only matrix dissolution but also fiber fracture. The flexural strength of all treated fiber posts was lower than that of the controls (P 〈 0.05 ), HF group shoed the lowest flexural strength ( P 〈 0.05). POPO fiber post showed the highest flexural strength among the three fiber posts treated by the same procedure. CONCLUSION: Chemical etching may decrease the three - point flexural strength of the fiber posts by dissolution of resin matrix.
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