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Dent Mater J：光固化时间对大块充填树脂不同深度的光固化/固化后容积聚合收缩和局部最终拉伸强度的影响

2019-07-09 lishiting MedSci原创

光固化聚合收缩拉伸强度
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这篇研究的目的是通过扫频光学相干断层扫描(SS-OCT)评估大块充填树脂采用不同光固化策略在光照后即刻以及24小时后对材料容积聚合收缩(VS)的影响，并评估其在不同固化深度的局部最终拉伸强度(UTS)。

这篇研究的目的是通过扫频光学相干断层扫描(SS-OCT)评估大块充填树脂采用不同光固化策略在光照后即刻以及24小时后对材料容积聚合收缩(VS)的影响，并评估其在不同固化深度的局部最终拉伸强度(UTS)。结果显示，当光固化时间从20减少至10至5 s时，光致聚合后的即刻VS明显降低。另一方面，由于固化后的聚合作用，它们在24小时后的VS值显著增加，并导致在所有光固化时间上的相似VS值。与10和20 s光固化时间相比，光固化5 s在24小时后明显减少复合树脂的局部UTS；因此，短时间光固化后发生的明显固化后聚合并不会改善复合树脂的机械特质。结论：光固化时间对固化深度的影响依赖于选择的大块充填树脂材料。原始出处：Ide K， Nakajima M， et al. Effect of light-curing time on light-cure/post-cure volumetric polymerization shrinkage and regional ultimate tensile strength at different depths of bulk-fill resin c

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    2019-07-11 chg122

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    2019-07-11 chenshujs

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