Graduate student, Araraquara Dental School, São Paulo State University (UNESP), Araraquara, Brazil.
Doctoral student, Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University (UNESP), Araraquara, Brazil.
J Prosthet Dent. 2020 Mar;123(3):483-490. doi: 10.1016/j.prosdent.2019.04.018. Epub 2019 Aug 2.
How the surfaces of monolithic esthetic restorations behave in the presence of acidic substances is unclear.
The purpose of this in vitro study was to evaluate the effect of simulated gastric juice on roughness, morphology, microhardness, substance loss, and color change of computer-aided design and computer-aided manufacturing (CAD-CAM) monolithic materials.
Disks from Lava Ultimate, VITA ENAMIC, IPS e.max CAD, and VITA SUPRINITY were analyzed for roughness, morphology, and microhardness by using a confocal microscope, scanning electron microscope (SEM), and Vickers hardness tester. Substance loss was determined by weighing the specimens on an analytical balance, and color change (ΔE) was assessed by using a spectrophotometer based on the CIELab parameters. All analyses were carried out before and after acid exposure.
Acid exposure significantly decreased the roughness, having a very high effect size on this property. The material was highly decisive in determining the microhardness, presenting the following order: VITA SUPRINITY>IPS e.max CAD>VITA ENAMIC>Lava Ultimate. The mass was not significantly affected by the acidic challenge. No significant difference in ΔE was found between Lava Ultimate and VITA ENAMIC and between IPS e.max CAD and VITA SUPRINITY. Lava Ultimate showed a higher ΔE than IPS e.max CAD and VITA SUPRINITY, whereas VITA ENAMIC exhibited higher ΔE only when compared with VITA SUPRINITY. All materials presented ΔE<1.
The simulated gastric juice significantly influenced the roughness of all the evaluated materials and promoted a color change classified as clinically undetectable in all materials.
单片美学修复体表面在酸性物质存在下的行为尚不清楚。
本体外研究的目的是评估模拟胃液对计算机辅助设计和计算机辅助制造（CAD-CAM）单片材料的粗糙度、形貌、显微硬度、物质损失和颜色变化的影响。
使用共聚焦显微镜、扫描电子显微镜（SEM）和维氏硬度计分析 Lava Ultimate、VITA ENAMIC、IPS e.max CAD 和 VITA SUPRINITY 磁盘的粗糙度、形貌和显微硬度。通过分析天平称重来确定物质损失，并用基于 CIELab 参数的分光光度计评估颜色变化（ΔE）。所有分析均在酸暴露前后进行。
酸暴露显著降低了粗糙度，对该性能具有非常高的效应量。材料在确定显微硬度方面具有决定性作用，呈现以下顺序：VITA SUPRINITY>IPS e.max CAD>VITA ENAMIC>Lava Ultimate。酸性挑战对质量没有显著影响。Lava Ultimate 和 VITA ENAMIC 之间以及 IPS e.max CAD 和 VITA SUPRINITY 之间在 ΔE 方面没有发现显著差异。Lava Ultimate 显示出比 IPS e.max CAD 和 VITA SUPRINITY 更高的 ΔE，而 VITA ENAMIC 仅在与 VITA SUPRINITY 相比时显示出更高的 ΔE。所有材料的 ΔE<1。
模拟胃液显著影响所有评估材料的粗糙度，并导致所有材料的颜色变化被归类为临床不可检测。
