深缘提升技术中的三维内腔和边缘适应性:高填充可流动复合材料的效率。

Allegra Baldi, Tommaso Rossi, Allegra Comba, Luca Monticone, Gaetano Paolone, Isabella Sannino, Alessandro Vichi, Cecilia Goracci, Nicola Scotti
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引用次数: 0

摘要

目的:在模拟深边缘隆起的情况下,评估不同流动材料在循环疲劳前后的界面三维适应性和内部空隙:选择 80 颗 (n = 80) 拔出的前臼齿,制备两个 II 类龋洞。方法:选取 80 颗拔出的前臼齿,制备两个 II 类龋洞,中侧的龋洞颈缘高于牙本质-釉质交界处(CEJ)1 mm,远侧的龋洞颈缘低于 CEJ 1 mm。进行粘接程序后,根据 2 mm 水平深边缘再定位所使用的材料将样本分为四组:纳米混合复合材料(Clearfil ES2,可乐丽);常规粘度可流动复合材料(Tetric Flow,Ivoclar);中等粘度可流动复合材料(Majesty ES2 Low Flow,可乐丽);高粘度可流动复合材料(Majesty ES2 Super Low Flow,可乐丽)。所有修复体最后都用纳米混合复合材料(可乐丽,Clearfil ES2)斜向分层。为了显示界面和内部间隙的发展情况,在模拟机械咀嚼(50 N,1 Hz)500,000 次之前和之后,使用微型计算机断层扫描(SkyScan 1172)对试样进行扫描。数据经过平滑处理和区域生长后被导入 Mimics 软件。只考虑了 2 毫米的边缘迁移体积。对获得的掩膜进行去噪和体积计算分析。收集基线时的界面间隙进展和内部空隙(以 mm3 为单位),并对基底和修复材料这两个变量进行双向方差分析(α 0.05),然后进行 Tukey 事后检验。为了评估机械老化后界面间隙进展的变化情况,还进行了一次双向方差分析,然后进行了 Tukey 事后检验:结果:方差分析测试表明,在基线时,不同修复材料之间存在显著差异(p =;0.01)。更具体地说,Tukey 事后检验显示,高填充中粘度复合材料在基线界面间隙方面的表现优于传统粘度复合材料。基线时的内部空隙方差分析结果表明,所测试的变量没有显著差异。热循环后内部间隙进展的方差分析显示,基底和所使用的修复材料均无差异:结论:就基线界面间隙而言,高填充中粘度复合材料的性能明显优于传统粘度可流动复合材料。使用咀嚼模拟器和热循环进行人工老化不会影响釉质和牙本质界面间隙的发展。测试的修复材料在老化后的性能相同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-Dimensional Internal Voids and Marginal Adaptation in Deep Margin Elevation Technique: Efficiency of Highly Filled Flowable Composites.

Purpose: To evaluate interfacial three-dimensional adaptation and internal voids of different flowable materials before and after cyclic fatigue in a simulated deep-margin elevation scenario.

Methods: Eighty (n = 80) extracted premolars were selected and two Class II cavities were prepared. The mesial one with cervical margin 1 mm above the cementum-enamel junction (CEJ) and the distal one with cervical margin 1 mm below the CEJ. After performing adhesive procedures, specimens were divided into four groups according to the employed materials for 2 mm horizontal deep-margin relocation: nanohybrid composite (Clearfil ES2, Kuraray); conventional viscosity flowable composite (Tetric Flow, Ivoclar); medium viscosity flowable composite (Majesty ES2 Low Flow, Kuraray); high viscosity flowable composite (Majesty ES2 Super Low Flow, Kuraray). All restorations were finalized by oblique layering with nanohybrid composite (Clearfil ES2, Kuraray). To reveal interfacial and internal gap progression, specimens were scanned with a micro-CT (SkyScan 1172), before and after 500,000 cycles of mechanical chewing simulation (50 N, 1 Hz). Data were imported into Mimics software after smoothing and region growing. Only the 2 mm margin relocation volumes were considered. Obtained masks were analyzed for noise removal and volume calculation. At baseline, interfacial gap progression and internal voids, expressed in mm3, were collected and statistically analyzed with two-way ANOVA (α 0.05) for the variables substrate and restorative materials followed by Tukey post-hoc test. An additional two-way ANOVA test, followed by Tukey post-hoc test, was performed to evaluate variation in interfacial gap progression after mechanical aging.

Results: At baseline, the ANOVA test showed a significant difference for the variable restorative materials (p = 0.01). More specifically, the Tukey post-hoc test revealed that the highly filled medium viscosity composite performed better than the conventional viscosity composite at baseline for the interfacial gap. The internal voids ANOVA test at baseline reported no significant differences for the variable tested. Analysis of variance for internal gap progression after thermocycling showed no differences for both substrate and restorative material employed.

Conclusions: Highly filled medium viscosity composite performed significantly better than the conventional viscosity flowable composite for what concern baseline interfacial gaps. Artificial aging with a chewing simulator and thermocycling did not affect interfacial gap progression on enamel and dentin. The tested restorative materials performed equally after aging.

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