Department of Operative Dentistry, University of North Carolina at Chapel Hill School of Dentistry, Chapel Hill, NC.
J Prosthodont. 2019 Jan;28(1):85-90. doi: 10.1111/jopr.12779. Epub 2018 Mar 5.
To determine the effect of changing the dispensing or mixing method of resin-modified glass ionomer (RMGI) cements on their water sorption, solubility, film thickness, and shear bond strength.
Disc-shaped specimens of RMGI cements (RelyX: Luting [handmix], Luting Plus [clicker-handmix], Luting Plus [automix], GC: Fuji PLUS [capsule-automix], FujiCEM 2 [automix], [n = 10]) were prepared according to ISO standard 4049 for water sorption and solubility tests. Furthermore, the percentage of mass change, percentage of solubility, and percentage of water absorbed was also determined. Film thickness was measured according to ISO standard 9917-2; the mean of 5 measurements for each cement was calculated. Shear bond strength for each cement was determined according to ISO standard 29022 before and after thermocycling at 20,000 cycles, temperatures 5 to 55°C with a 15-second dwell time (n = 10/subgroup). Two- and one-way ANOVA were used to analyze data for statistical significance (p < 0.05).
Water sorptions of the RMGI cements were in close range (214-250 μg/mm ) with no statistical differences between counterparts (p > 0.05). RelyX Luting Plus (clicker-handmix) displayed lower solubility than its handmix and automix counterparts (p < 0.05). Film thickness of RelyX cements was significantly different (p < 0.05). RelyX Luting Plus (automix) had the lowest film thickness (19 μm) compared to its handmix (48 μm) and clicker-handmix (117 μm) counterparts (p < 0.05). GC Fuji PLUS (capsule-automix, 22 μm) was significantly lower than the automix version (GC FujiCEM 2, 127 μm) (p < 0.05). Shear bond strength of RelyX Luting Plus (automix) was significantly lower than its handmix and clicker-handmix versions (p < 0.05). GC Fuji PLUS (capsule-automix) was significantly higher than GC FujiCEM 2 (automix) (p < 0.05). The binary interaction of the two independent variables (dispensing/mixing method and thermocycling) was significant for the shear bond strengths of the GC cements only (p < 0.05).
Change in the dispensing/mixing method of RMGI cement from the same brand may have an effect on its physical properties, in addition to its film thickness and shear bond strength. Newer, easier, and faster cement delivery systems are not necessarily better. Clinical outcomes of these differences are yet to be confirmed.
确定改变树脂改良型玻璃离子（RMGI）水泥的配药或混合方法对其吸水率、溶解度、膜厚和剪切粘结强度的影响。
根据 ISO 4049 标准，制备 RMGI 水泥（RelyX：Luting [手工混合]、Luting Plus [点击器-手工混合]、Luting Plus [自动混合]、GC：Fuji PLUS [胶囊-自动混合]、FujiCEM 2 [自动混合]，[n=10]）的圆盘状试件，用于吸水率和溶解度测试。此外，还确定了质量变化百分比、溶解度百分比和吸水率百分比。根据 ISO 9917-2 标准测量膜厚；计算每种水泥的 5 次测量的平均值。在 20000 次循环、5 至 55°C 的温度下，每个水泥的剪切粘结强度根据 ISO 29022 标准进行测试，停留时间为 15 秒（n=10/亚组）。使用双因素和单因素方差分析来分析数据的统计学意义（p<0.05）。
RMGI 水泥的吸水率在 214-250μg/mm 之间，且各对照组之间无统计学差异（p>0.05）。RelyX Luting Plus（点击器-手工混合）的溶解度低于其手工混合和自动混合对照物（p<0.05）。RelyX 水泥的膜厚有显著差异（p<0.05）。与手工混合（48μm）和点击器-手工混合（117μm）相比，RelyX Luting Plus（自动混合）的膜厚最低（19μm）（p<0.05）。GC Fuji PLUS（胶囊-自动混合，22μm）明显低于自动混合版本（GC FujiCEM 2，127μm）（p<0.05）。RelyX Luting Plus（自动混合）的剪切粘结强度明显低于其手工混合和点击器-手工混合版本（p<0.05）。GC Fuji PLUS（胶囊-自动混合）明显高于 GC FujiCEM 2（自动混合）（p<0.05）。只有 GC 水泥的剪切粘结强度的两个独立变量（配药/混合方法和热循环）的二元相互作用具有统计学意义（p<0.05）。
同一品牌的 RMGI 水泥的配药/混合方法的改变可能会影响其物理性能，除了膜厚和剪切粘结强度。更新、更简单、更快的水泥输送系统不一定更好。这些差异的临床结果尚待证实。
