Ashok Kumar Vinitha, Ramakrishnan Hariharan, Sampathkumar Jayakrishnakumar, Baskaran Shivakumar, Arumuganainar Deepavalli
Post graduate, Department of Prosthodontics, Crown and Bridge, Ragas Dental College and Hospital, Chennai 600119, Tamil Nadu, India.
Principal, Department of Prosthodontics and Implantology, Thai Moogambigai Dental College and Hospital, Dr. MGR educational and research institute, (DU), Maduravoyal, Chennai 600095, Tamil Nadu, India.
J Stomatol Oral Maxillofac Surg. 2025 Sep;126(4S):102208. doi: 10.1016/j.jormas.2024.102208. Epub 2024 Dec 24.
This in-vitro study aimed to compare the shear bond strength (SBS) of cobalt-chromium (Co-Cr) crowns on Corticobasal® implant abutments, evaluating the effects of two surface treatments and two luting agents.
Thirty Co-Cr crowns were fabricated using CAD-CAM technology with a direct metal laser sintering process and divided into three groups based on surface treatment: Group I (untreated), Group II (sandblasted with 50 μm Al₂O₃), and Group III (Er: YAG laser etching). Each group was further subdivided based on luting cement: Sub group A (GC Fuji Plus) and Sub group B (Rely X U200). This resulted in a total of six groups. The implants were stabilized in auto-polymerizing acrylic resin, and cementation followed standardized protocols. Thermocycling with 1000 cycles (5 °C-55 °C) simulated oral conditions. SBS was tested using a universal testing machine at a crosshead speed of 1 mm/min. Failure patterns were analyzed using stereomicroscopy to classify adhesive, cohesive, and mixed failures. Statistical analysis was performed using one-way ANOVA and Bonferroni post-hoc tests (p < 0.05).
Group IIIA (laser-treated, GC Fuji Plus) showed the highest SBS (243.15 MPa), followed by Group IIA (sandblasted + GC Fuji Plus), at 231.81 MPa. The lowest SBS was observed in Group IB (untreated, Rely X U200) at 124.24 MPa. Both sandblasting and laser treatment significantly enhanced SBS, with GC Fuji Plus consistently outperforming Rely X U200. A significant difference of 48.17 MPa was observed between laser-treated Groups IIIA and IIIB (p < 0.01).
Laser etching and GC Fuji Plus cementation provided the highest SBS for Co-Cr crowns on Corticobasal® implants. Sandblasting was a secondary effective treatment, while untreated crowns exhibited the weakest bond strength.
本体外研究旨在比较皮质基底®种植体基台上钴铬（Co-Cr）冠的剪切粘结强度（SBS），评估两种表面处理和两种粘结剂的效果。
采用CAD-CAM技术和直接金属激光烧结工艺制作30个Co-Cr冠，并根据表面处理分为三组：第一组（未处理）、第二组（用50μm Al₂O₃喷砂）和第三组（Er:YAG激光蚀刻）。每组再根据粘结水门汀进一步细分：A亚组（GC Fuji Plus）和B亚组（Rely X U200）。这总共产生了六组。将种植体固定在自凝丙烯酸树脂中，并按照标准化方案进行粘结。通过1000次循环（5°C - 55°C）的热循环模拟口腔条件。使用万能试验机以1mm/min的十字头速度测试SBS。使用体视显微镜分析失败模式，以分类粘结、内聚和混合失败。使用单因素方差分析和Bonferroni事后检验进行统计分析（p < 0.05）。
第三组A（激光处理，GC Fuji Plus）显示出最高的SBS（243.15MPa），其次是第二组A（喷砂 + GC Fuji Plus），为231.81MPa。在第一组B（未处理，Rely X U200）中观察到最低的SBS，为124.24MPa。喷砂和激光处理均显著提高了SBS，GC Fuji Plus始终优于Rely X U200。在激光处理的第三组A和第三组B之间观察到48.17MPa的显著差异（p < 0.01）。
激光蚀刻和GC Fuji Plus粘结为皮质基底®种植体上的Co-Cr冠提供了最高的SBS。喷砂是一种次要的有效处理方法，而未处理的冠表现出最弱的粘结强度。
