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首页> 外文期刊>Acta biomaterialia >An in vitro study on the maturation of conventional glass ionomer cements and their interface to dentin
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An in vitro study on the maturation of conventional glass ionomer cements and their interface to dentin

机译：常规玻璃离子水门汀的成熟及其与牙本质界面的体外研究

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The objective of the study was to investigate the influence of long-term storage (up to 1 year) and coating on the variation of micro-mechanical properties of four conventional restorative glass ionomer cements (GICs) within 3.5 mm deep class I cavities. Four commercially available GICs (Riva Self Cure (SDI), ChemFil Rock (Dentsply), Fuji IX Fast and Fuji IX GP Extra/Equia (GC)) were applied to 100 teeth. In each tooth, two similar 3.5 mm deep class I cavities were prepared and filled with the GICs, with and without resin coating. The samples were stored in artificial saliva at 37 C for 1 week, 1 month, 3 months, 6 months and 1 year. The variation in mechanical properties (indentation modulus (E) and Vickers hardness (HV)) were determined in 100 μm steps starting from the filling surface, through the intermediate layer in between dentine and GIC, and ending 100 μm in dentin. HV and E were strongly influenced by the material (P 0.05, partial eta-squared ηP 2 = 0.31 and 0.23) but less by aging duration (P 0.05, ηP 2 = 0.02 and 0.12) and resin coating (P 0.05, ηP 2 = 0.02 and 0.03). The depth of measurement (0-2 mm) has no influence on HV (P = 0.789). HV shows a gentle increase over the 1 year storage period (P = 0.002). A ～300 μm GIC zone at the areas close to dentin with weaker properties as those measured in dentin or GIC was identified in all fillings, irrespective of the presence of coating, and at all storage periods. The thickness of this zone is more strongly influenced by storage (P 0.05, ηP 2 = 0.081) than by material type (P 0.05, ηP 2 = 0.056), while coating showed no influence (P = 0.869). Filler morphology and dimension were similar to upper parts of the GIC filling; however, the amount of low cations was higher. We concluded that the development of an intermediate layer in between dentine and GIC with lower mechanical properties might be responsible for the bond quality of GIC to dentine. Moreover, class I GIC restorations are unlikely to feature constant mechanical properties throughout the cavity, regardless of conditions such as aging and coating.
机译：这项研究的目的是研究长期存储（长达1年）和涂层对在3.5毫米深的I类腔内四种传统的修复性玻璃离聚物水泥（GIC）的微机械性能变化的影响。将四种市售GIC（Riva Self Cure（SDI），ChemFil Rock（Dentsply），Fuji IX Fast和Fuji IX GP Extra / Equia（GC））涂在100颗牙齿上。在每颗牙齿上，准备两个相似的3.5毫米深的I类腔，并用GIC填充，有或没有树脂涂层。将样品在37℃的人工唾液中保存1周，1个月，3个月，6个月和1年。从填充表面开始，经过牙本质和GIC之间的中间层，以牙本质为100μm，以100μm的步长确定机械性能（压痕模量（E）和维氏硬度（HV））的变化。 HV和E受材料的强烈影响（P <0.05，ηeta2的部分平方η= 0.31和0.23），而老化时间（P <0.05，ηP2 = 0.02和0.12）和树脂涂层的影响较小（P <0.05， ηP2 ＝ 0.02和0.03）。测量深度（0-2 mm）对HV无影响（P = 0.789）。 HV在1年的存储期内显示出缓慢的增长（P = 0.002）。在所有填充物中，无论是否存在涂层，在所有存储期间，都在牙本质附近的牙本质区域发现了一个〜300μm的GIC区，其性质较牙本质或GIC弱。与存储类型（P <0.05，ηP2 = 0.056）相比，该区域的厚度受存储（P <0.05，ηP2 = 0.081）的影响更大，而涂层无影响（P = 0.869）。填充物的形态和尺寸与GIC填充物的上部相似;但是，低阳离子含量较高。我们得出的结论是，在牙本质和GIC之间具有较低机械性能的中间层的发展可能是GIC与牙本质的粘结质量的原因。此外，不管老化和涂层等条件如何，I类GIC修复体在整个腔内都不太可能具有恒定的机械性能。

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