Ali Ahmed, Banerjee Avijit, Mannocci Francesco
Am J Dent. 2016 Feb;29(1):46-50.
To compare the shear bond strength (SBS) and fractography between mineral trioxide aggregate (MTA) and glass-ionomer cement (GIC) or resin composite (RC) after varying MTA setting time intervals.
MTA was mixed and packed into standardized cavities (4 mm diameter x 3 mm depth) in acrylic blocks. RC with 37% H₃PO₄ and type 2 (etch and rinse) adhesive, or conventional GIC was bonded to the exposed MTA sample surfaces after 10-minute, 24-hour, 72-hour and 30-day MTA setting intervals (n = 10/group, eight groups). Samples were stored (37°C, 24 hours, 100% humidity) before SBS testing and statistical analysis (ANOVA, Tukey LSD, P < 0.05). Fractography was undertaken using stereomicroscopy for all samples and three random samples/group by using SEM.
Significant differences between all groups were found (P= 0.002). SBS of RC:MTA (Max 5.09 ± 1.79 MPa) was higher than the SBS of GIC:MTA (Max 3.74 ± 0.70 MPa) in 24-hour, 72-hour and 30-day groups except in the 10-minute MTA setting time groups, where SBS of GIC:MTA was higher. There was a significant effect of time on SBS of RC: MTA (P = 0.008) and no effect on SBS of GIC:MTA (P = 3.00). Fractography revealed mixed (adhesive/cohesive) failures in all groups; in RC:MTA groups there was a decrease in adhesive failure with time in contrast to the GIC:MTA groups.
比较不同三氧化矿物凝聚体（MTA）凝固时间间隔后，MTA与玻璃离子水门汀（GIC）或树脂复合体（RC）之间的剪切粘结强度（SBS）及断口形貌。
将MTA混合并填充到丙烯酸树脂块体中的标准化窝洞（直径4mm×深度3mm）内。在MTA凝固10分钟、24小时、72小时及30天后，将含37%磷酸和2型（酸蚀冲洗型）粘结剂的RC或传统GIC粘结到暴露的MTA样本表面（每组n = 10，共八组）。在进行SBS测试和统计分析（方差分析、Tukey最小显著差异法，P < 0.05）之前，样本先储存（37°C，24小时，100%湿度）。对所有样本使用体视显微镜进行断口形貌分析，每组随机选取三个样本使用扫描电子显微镜进行断口形貌分析。
发现所有组之间存在显著差异（P = 0.002）。在24小时、72小时和30天组中，RC:MTA的SBS（最大值5.09±1.79MPa）高于GIC:MTA的SBS（最大值3.74±0.70MPa），但在MTA凝固10分钟组中，GIC:MTA的SBS更高。时间对RC:MTA的SBS有显著影响（P = 0.008），对GIC:MTA 的SBS无影响（P = 3.00）。断口形貌分析显示所有组均为混合（粘结/内聚）破坏；与GIC:MTA组相比，RC:MTA组中粘结破坏随时间减少。
