The impact of resin-coating on sub-critical crack extension in a porcelain laminate veneer material.
The impact of resin-coating on sub-critical crack extension in a porcelain laminate veneer material.
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树脂涂层对瓷层压板材料亚临界裂纹扩展的影响。
DOI：
10.1016/j.dental.2017.02.004
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Cao X
中科院分区：
文献类型：
--
作者：
Cao X
ObjectivesCharacterization之间的相互作用的裂纹扩展，裂纹稳定和应力/应变松弛的聚合物基质，应力腐蚀开裂和表面缺陷人口内的树脂基粘接剂的机械响应之间的相互作用可以延长PLV修复寿命通过优化粘固协议。的目的是调查的影响，应力腐蚀开裂和粘弹性行为的树脂为基础的密封胶独立控制的环境条件操作过程中的测试标本fabrication.MethodsThe应力腐蚀陶瓷裂纹尖端和潜在的粘弹性响应的影响，负载的树脂涂层浸渍裂纹被隔离。树脂涂覆的长方体陶瓷试样在环境湿度或水分排除后制造。在2.5、10、40、160或640 N/min的恒定加载速率下测定各组（n = 20）的双轴弯曲强度，并将数据与无涂层对照品进行比较。断口分析进行所有断裂的测试samples. ResultsResultsResults-cement涂层导致显着的陶瓷强化在所有条件下测试（p < 0.01）。双因素方差分析表明，在树脂包衣过程中排除水分显著增加了平均BFS（p<0.01），但事后Tukey检验表明，水分排除仅在中等加载速率下导致BFS值显著增加，在最快或最慢加载速率下均未观察到显著差异（分别为640和2.5 N/min）。重要性通过树脂-水泥系统对PLV材料的机械增强还有待优化。树脂-水泥本身的粘弹性行为可以影响观察到的增强和亚临界裂纹扩展的幅度。
ObjectivesCharacterisation of the interaction between crack extension, crack stabilisation and stress/strain relaxation in the polymeric matrix, the interplay between stress corrosion cracking and the mechanical response of a resin-based luting adhesive within a surface defect population could extend PLV restoration longevity by optimising cementation protocols. The aim was to investigate the influence of stress corrosion cracking and the viscoelastic behaviour of a resin-based luting adhesive independently by controlling the environmental conditions operative during test specimen fabrication.MethodsThe effects of stress corrosion at ceramic crack tips and potential viscoelastic responses to loading of the resin-coated impregnating cracks were isolated. Resin-coated feldspathic ceramic test specimens were fabricated in ambient humidity or following moisture exclusion. Bi-axial flexure strengths of groups (n = 20) were determined at constant loading rates of 2.5, 10, 40, 160 or 640 N/min and data was compared with uncoated controls. Fractographic analyses were performed on all fractured test specimens.ResultsResin-cement coating resulted in significant ceramic strengthening in all conditions tested (p < 0.01). A two-way ANOVA demonstrated that the exclusion of moisture during resin- coating significantly increased mean BFS (p<0.01) but post-hoc Tukey tests identified that moisture exclusion resulted in significant increases in BFS values only at intermediate loading rates with no significant differences observed at either the fastest or slowest loading rates (640 and 2.5 N/min, respectively).SignificanceMechanical reinforcement of PLV materials by resin-cement systems is yet to be optimized. The viscoelastic behavior of the resin-cement itself can influence the magnitude of reinforcement observed and sub-critical crack growth.
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