OBJECTIVE The aim was to compare restorative marginal integrity of ceramic crowns luted with bioactive and resin cements using micro-computed tomography (micro-CT) microleakage evaluations and bond strength assessment. METHODS Thirty molar teeth were prepared by sectioning and polishing for dentin exposure for resin cement build-ups. Teeth were randomly divided among three groups of cements: (1) bioactive (ACTIVA); (2) glass ionomer cement (GIC; Ketac Cem); and (3) resin luting agent (Nexus 3). Bonding regime and build-ups (4 mm × 2 mm) were performed using the recommended protocol. For microleakage assessment, 30 premolar teeth were prepared for dentin-bonded crowns using lithium disilicate ceramic and the computer-aided design and computer-aided manufacturing technique. Crowns were cemented with standard load, cement amount, and duration using three cements (Group A: bioactive; Group B: GIC; Group C: resin) and photopolymerized. Cemented crowns were evaluated for volumetric infiltration using micro-CT (Skyscan, Bruker 1173- at 86 kV, 93 µA, 620 ms) after immersion in 50% solution of silver nitrate (AgNO3) (24 hours). Shear bond strength (SBS) was assessed by fracture of cement build-ups at a cross-head speed of 0.5 mm/min in a universal testing machine. RESULTS Mean SBS among bioactive (21.54 ± 3.834 MPa) specimens was significantly higher than that for GIC (14.08 ± 3.25 MPa) specimens (p < 0.01), but they were comparable to resin samples (p > 0.05) (24.73 ± 4.32 MPa). Microleakage was significantly lower in crowns luted with bioactive (0.381 ± 0.134) cement compared to GIC (1.057 ± 0.399 mm3) (p < 0.01) and resin (0.734 ± 0.166 mm3) (p = 0.014) cemented crowns. The type of luting agent had a significant influence on the microleakage of crowns and bond strength to dentin (p < 0.05). CONCLUSION Bioactive cement exhibited less microleakage and comparable SBS to resin luting agents in in vitro conditions.

中文翻译：

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与树脂粘固剂相比，生物活性粘固剂粘固的牙本质粘合冠的粘合完整性和微渗漏：体外研究

目的 目的是使用微型计算机断层扫描 (micro-CT) 微渗漏评估和粘合强度评估来比较用生物活性和树脂水泥粘固的陶瓷牙冠的修复边缘完整性。方法 30 颗磨牙通过切片和抛光制备牙本质暴露，用于树脂粘固剂堆积。牙齿被随机分为三组水泥：（1）生物活性（ACTIVA）；(2)玻璃离子水门汀(GIC；Ketac Cem)；(3) 树脂粘合剂(Nexus 3)。使用推荐的方案进行粘合方案和堆积 (4 mm × 2 mm)。对于微渗漏评估，使用二硅酸锂陶瓷和计算机辅助设计和计算机辅助制造技术制备了 30 颗用于牙本质粘合冠的前磨牙。牙冠用标准负荷、水泥用量、使用三种水泥（A 组：生物活性；B 组：GIC；C 组：树脂）和光聚合的持续时间。在浸入 50% 硝酸银 (AgNO3) 溶液（24 小时）后，使用 micro-CT（Skyscan，Bruker 1173- 在 86 kV，93 µA，620 ms）评估骨水泥冠的体积浸润。剪切粘合强度 (SBS) 通过在万能试验机中以 0.5 毫米/分钟的十字头速度通过水泥堆积物的断裂来评估。结果 生物活性样品（21.54 ± 3.834 MPa）的平均 SBS 显着高于 GIC（14.08 ± 3.25 MPa）样品（p < 0.01），但与树脂样品相当（p > 0.05）（24.73 ± 4.32 MPa） . 与 GIC (1.057 ± 0.399 mm3) (p < 0.01) 和树脂 (0.734 ± 0.166 mm3) (p = 0. 014) 粘接冠。粘固剂的种类对牙冠的微渗漏和与牙本质的结合强度有显着影响（p < 0.05）。结论 生物活性水泥在体外条件下表现出较少的微渗漏和与树脂粘固剂相当的 SBS。