Aljohani Alaa, Bashiri Rafiullah, Vasconcellos Adalberto B, Suliman Abdulhaq A, Sulaiman Taiseer A
Postgraduate student, Division of Comprehensive Oral Health, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC.
Assistant Professor, Division of Comprehensive Oral Health, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC.
J Prosthet Dent. 2024 Dec;132(6):1327.e1-1327.e7. doi: 10.1016/j.prosdent.2024.08.023. Epub 2024 Sep 17.
Despite the advances in dental cements a significant gap remains in understanding how different dispensing and mixing techniques impact the physical properties of resin-based cements.
The purpose of this in vitro study was to investigate how the physical properties, shear bond strengths (before and after thermocycling), and film thickness of resin-based cements change based on the dispensing and mixing methods.
Eight different resin-based cements were evaluated, and specimens were prepared for each method (n=14) by following International Organization for Standardization (ISO) standards. The specimens were desiccated and immersed according to the ISO standard, and measurements were made to determine water sorption, solubility, mass change, and film thickness. Finally, specimens were thermocycled (5-55˚C for 20 000 cycles), and shear bond strength was evaluated. Statistical analysis was then performed with the 1- and 2-way ANOVA and the Tukey post hoc test (α=.05).
For Variolink Esthetic (automix, 30.03 µg/mm), the W was 74.8% greater than Variolink II (hand mix, 17.18 µg/mm) and 682.3% more soluble (P<.05). The least soluble resin-based cements were RelyX Unicem (3.83 µg/mm), RelyX Unicem 2 (2.22 µg/mm), and Variolink II (2.43 µg/mm). PANAVIA SA automix and G-CEM LinkAce automix had twice the film thickness as their hand mixed counterparts (P<.05). Thermocycling reduced the shear bond strength for most resin-based cements. RelyX Unicem (3.94 MPa), Variolink II (8.52 MPa), and G-CEM Capsule (5.02 MPa) demonstrated significantly higher shear bond strength compared with their automix counterparts (P<.05).
The dispensing methods were found to significantly impact the properties of resin-based cements. Variolink II demonstrated the lowest water sorption and highest shear bond strength among the cements tested. RelyX in both mixing methods exhibited a low solubility rate. Additionally, RelyX showed consistent thickness, regardless of the different dispensing methods.
尽管牙科水门汀已有进展，但在了解不同的调配和混合技术如何影响树脂基水门汀的物理性能方面仍存在显著差距。
本体外研究的目的是调查树脂基水门汀的物理性能、剪切粘结强度（热循环前后）和薄膜厚度如何根据调配和混合方法而变化。
评估了八种不同的树脂基水门汀，并按照国际标准化组织（ISO）标准为每种方法制备样本（n = 14）。样本按照ISO标准进行干燥和浸泡，并进行测量以确定吸水率、溶解度、质量变化和薄膜厚度。最后，对样本进行热循环（5 - 55˚C，20000次循环），并评估剪切粘结强度。然后使用单因素和双因素方差分析以及Tukey事后检验进行统计分析（α = 0.05）。
对于Variolink Esthetic（自动混合，30.03 μg/mm），其吸水率比Variolink II（手动混合，17.18 μg/mm）高74.8%，溶解度高682.3%（P < 0.05）。溶解度最低的树脂基水门汀是RelyX Unicem（3.83 μg/mm）、RelyX Unicem 2（2.22 μg/mm）和Variolink II（2.43 μg/mm）。PANAVIA SA自动混合和G - CEM LinkAce自动混合的薄膜厚度是其手动混合对应产品的两倍（P < 0.05）。热循环降低了大多数树脂基水门汀的剪切粘结强度。与自动混合对应产品相比，RelyX Unicem（3.94 MPa）、Variolink II（8.52 MPa）和G - CEM Capsule（5.02 MPa）表现出显著更高的剪切粘结强度（P < 0.05）。
发现调配方法对树脂基水门汀的性能有显著影响。在测试的水门汀中，Variolink II的吸水率最低，剪切粘结强度最高。两种混合方法下的RelyX溶解度都较低。此外，无论调配方法如何，RelyX的厚度都保持一致。
