Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Department of Substitutive Dental Science, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia.
Eur Endod J. 2020 Dec;5(3):288-294. doi: 10.14744/eej.2020.75046.
The purpose of this study was to evaluate the shear bond strength (SBS) of hydraulic calcium silicate (Biodentine) as a core material to the e.max ceramic restoration.
Forty discs (6 mm diameter; 2 mm thickness) were fabricated from each core material, Hydraulic calcium silicate [Biodentine™, Septodont], resin composite [Filtek™Z250 XT, 3M ESPE], and resin-modified glass ionomer cement (RMGIC) [GC Fuji II LC, GC Corporation]. Dentine surfaces of 40 extracted human permanent molars were exposed and used as a control group. All specimens were mounted in self-curing acrylic resin. One hundred sixty IPS e.max discs were fabricated (4 mm diameter; 2 mm thickness) and cemented to the core specimens with Variolink N (IvoclarVivadent). After storage in distilled water (37oC; 24h), the specimens were thermocycled 1.500 times. SBS was tested using a universal testing machine at 0.05 mm/min crosshead speed. The fracture modes were determined by a stereomicroscope at ×20 magnification. Data were analyzed using one-way analysis of variance followed by Tukey's test (P=0.05).
The mean SBS values of four tested groups showed statistically significant differences (P<0.05). The resin composite group exhibited the highest SBS value (36.17±6.08 MPa), while the Biodentine had the lowest SBS value (21.86±3.18 MPa). Mixed failure mode was the most common failure type in all tested groups except in the Biodentine group, which had a predominantly cohesive failure.
The SBS of e.max ceramic restorations cemented with resin is affected by the type of core material. Biodentine core material had the lowest SBS to e.max restoration. However, when Biodentine is indicated to be used as core material for pulp preservation, it is recommended to be covered with a layer of resin composite material to enhance its bonding strength to the e.max restoration.
本研究旨在评估水硬性硅酸钙（Biodentine）作为核材料与 e.max 陶瓷修复体的粘结强度（SBS）。
从每种核材料（水硬性硅酸钙 [Biodentine™，施特劳宾公司]、树脂复合材料 [Filtek™Z250 XT，3M ESPE] 和树脂改性玻璃离子水泥（RMGIC）[GC Fuji II LC，GC 公司]）中制备 40 个直径为 6mm、厚度为 2mm 的圆盘。暴露 40 颗从人恒磨牙中提取的牙本质表面作为对照组。所有标本均安装在自固化丙烯酸树脂中。制备 160 个 IPS e.max 圆盘（直径 4mm，厚度 2mm），并用 Variolink N（义获嘉伟瓦登特公司）将其粘接到核标本上。在蒸馏水中（37℃，24h）储存后，将样本进行 1500 次热循环。使用万能试验机以 0.05mm/min 的十字头速度测试 SBS。通过立体显微镜在 ×20 放大倍数下确定断裂模式。使用单向方差分析，随后使用 Tukey 检验（P=0.05）分析数据。
四个测试组的平均 SBS 值显示出统计学上的显著差异（P<0.05）。树脂复合材料组表现出最高的 SBS 值（36.17±6.08MPa），而 Biodentine 组的 SBS 值最低（21.86±3.18MPa）。混合失效模式是所有测试组中最常见的失效类型，除了 Biodentine 组，其主要为内聚失效。
用树脂粘结的 e.max 陶瓷修复体的 SBS 受核材料类型的影响。Biodentine 核材料与 e.max 修复体的 SBS 最低。然而，当 Biodentine 被指示用作牙髓保存的核材料时，建议在其表面覆盖一层树脂复合材料，以增强其与 e.max 修复体的粘结强度。
