Resin Cement Residue Removal Techniques: In Vitro Analysis of Marginal Defects and Discoloration Intensity Using Micro-CT and Stereomicroscopy

IF 0.5 Q4 DENTISTRY, ORAL SURGERY & MEDICINE Open Dentistry Journal Pub Date : 2022-04-01 DOI:10.3390/dj10040055
Mara Gaile, E. Papia, Vita Zalite, J. Locs, U. Soboleva
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引用次数: 1

Abstract

The objective was to compare marginal defects and evaluate discoloration for adhesively cemented veneers in vitro when using two cement removal techniques. Twenty premolars were prepared with chamfer and borders in enamel. IPS e.max CAD veneers were cemented using Panavia V5 and divided in two groups (n = 10): cement excess removed with a probe after tack-curing for 3–5 s, or cement excess removed with a brush, then completely polymerized. All teeth were stored in alginate gel until micro-CT examination. Scanning was performed twice: directly after cementation and after thermocycling (5000 cycles, between 5 and 55 °C). To analyze discoloration, teeth were colored using 0.5% basic fuchsine and examined under a stereomicroscope. Depth of dye infiltration was scored 0 (no discoloration) to 5 (discoloration along the entire margin). Statistically significant differences of cement defects before thermocycling were reported, where brushing showed more defects than probing (p = 0.0161). After thermocycling, the defects increased for both groups. Extensive discoloration was the most common (55.56%) when removing excess by probing; by brushing, 90% of the specimens exhibited slight discoloration (p = 0.008). Regression analysis showed no relationship between type of defect and degree of discoloration. Removing cement with a brush causes more marginal defects, however less discoloration after thermocycling.
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树脂水泥残渣去除技术:微ct和体视显微镜对边缘缺陷和变色强度的体外分析
目的是比较边缘缺陷和评估变色粘接胶结单板在体外使用两种水泥去除技术。预备前磨牙20颗,牙釉质有倒角和边。使用Panavia V5胶结IPS e.max CAD贴面,并分为两组(n = 10):在胶粘固化3-5 s后用探针去除多余的水泥,或用刷子去除多余的水泥,然后完全聚合。所有牙齿保存在海藻酸盐凝胶中,等待显微ct检查。扫描进行了两次:胶结后直接扫描和热循环后扫描(5000次循环,在5到55°C之间)。为了分析变色情况,用0.5%的碱性品红给牙齿上色,并在体视显微镜下进行检查。染料浸润深度评分为0(无变色)至5(整个边缘变色)。在热循环前报告的水泥缺陷有统计学意义的差异,其中刷牙比探针显示更多的缺陷(p = 0.0161)。热循环后,两组的缺陷均有所增加。当用探针去除多余部分时,广泛变色最为常见(55.56%);通过刷牙,90%的标本出现轻微变色(p = 0.008)。回归分析显示缺损类型与变色程度无相关性。用刷子去除水泥会导致更多的边缘缺陷,但热循环后变色较少。
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来源期刊
Open Dentistry Journal
Open Dentistry Journal DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
2.00
自引率
0.00%
发文量
86
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