酸蚀浓度和烧成对硅酸锂锆陶瓷经黏结剂黏固后长期粘结强度的影响。

Impact of Acid Concentration and Firing on the Long-term Bond Strength of a Zirconia-Lithium Silicate Ceramic Following Adhesive Cementation.

出版信息

J Adhes Dent. 2019;21(4):355-363. doi: 10.3290/j.jad.a42998.

DOI:10.3290/j.jad.a42998

PMID:31432050

Abstract

PURPOSE

To evaluate the effect of different firing stages (without firing, additional crystallization and glaze firings), hydrofluoric acid (HF) concentrations (5% and 10%), and thermocycling on the bond strength between resin cement and a zirconia-lithium silicate (ZLS) ceramic.

MATERIALS AND METHODS

ZLS ceramic (Celtra Duo, Dentsply Sirona) blocks were cut into smaller blocks and divided into 12 groups (N = 72), according to the HF concentration used, firing stage, and thermocycling (n = 6). All specimens were silanized (Monobond N, Ivoclar) and cemented with resin cement (Multilink N, Ivoclar) onto blocks of composite resin (Filtek Z250 XT, 3M). The specimens were immersed in distilled water for 24 h. The blocks were cut into sticks and tested immediately or thermocycled for 10,000 cycles in water (5°C-55°C). Microtensile bond strength (μTBS) testing was then performed in a universal testing machine (0.5 mm/min, 50 kgf load cell). The failure modes of the sticks were examined using SEM and classified as adhesive, predominantly adhesive, or cohesive. Fracture surfaces were topographically evaluated using SEM. The 5% and 10% HF groups were analyzed separately and the data submitted to two-way ANOVA and Tukey's test (p < 0.05). Additional samples were used for SEM topographic analysis of representative ceramic surfaces.

RESULTS

The most frequent types of failure were predominantly adhesive between cement and ceramic and adhesive (cement completely covered the composite). Statistically significant differences were found only for the thermocycling factor (p < 0.05) for both HF concentrations. However, for the 10% HF groups, a marked decrease in μTBS was observed after firing and thermocycling. SEM showed superficial irregularities on ZLS without etching, partial and total dissolution of the vitreous matrix and exposure of the crystals using 5% and 10% HF, respectively.

CONCLUSION

The crystallization and glaze firings of ZLS ceramics conditioned with 5% HF promoted bond strength maintenance after thermocycling. Thermocycling decreased the bond strength in all groups, but mainly for fired ZLS conditioned with 10% HF.

摘要

目的

评估不同烧制阶段（无烧制、附加结晶和釉烧制）、氢氟酸（HF）浓度（5%和 10%）和热循环对树脂水泥与氧化锆锂硅（ZLS）陶瓷之间粘结强度的影响。

材料和方法

将 ZLS 陶瓷（Celtra Duo，登士柏西诺德）块切割成较小的块，并根据使用的 HF 浓度、烧制阶段和热循环（n = 6）将其分为 12 组（N = 72）。所有标本均用硅烷化剂（Monobond N，义获嘉）处理，并将树脂水泥（Multilink N，义获嘉）粘接到复合树脂块（Filtek Z250 XT，3M）上。将标本浸入蒸馏水中 24 小时。将块切割成棒状，并立即进行测试，或在水中（5°C-55°C）进行 10000 次热循环。然后在万能试验机（0.5 mm/min，50 kgf 称重传感器）上进行微拉伸粘结强度（μTBS）测试。使用扫描电子显微镜（SEM）检查棒的失效模式，并将其分类为粘结、主要粘结或内聚。使用 SEM 对断裂表面进行形貌评估。单独分析 5%和 10%HF 组，将数据提交给双因素方差分析和 Tukey 检验（p < 0.05）。使用 SEM 对代表性陶瓷表面进行形貌分析的额外样本。

结果

最常见的失效类型是水泥与陶瓷之间的主要粘结和粘结（水泥完全覆盖复合材料）。仅在两种 HF 浓度下均发现热循环因素有统计学意义（p < 0.05）。然而，对于 10%HF 组，在烧制和热循环后，μTBS 明显下降。SEM 显示，未经蚀刻的 ZLS 表面存在不规则性，使用 5%和 10%HF 分别部分和完全溶解玻璃体基质并暴露晶体。