Yassin Mohammed, Salih Shatha
Department of Conservative Dentistry and Endodontics, Hawler Medical University, College of Dentistry, Erbil, IRQ.
Cureus. 2022 Dec 27;14(12):e33012. doi: 10.7759/cureus.33012. eCollection 2022 Dec.
Background One of the most frequently encountered issues with metal-ceramic restorations is the fracture of veneering porcelain. This in-vitro study aims to evaluate the effect of clinical sandblasting with 50 μm aluminum oxide and 30 μm silica-coated particles on the surface roughness of metal cores and the subsequent effect on their fracture resistance after the addition of specific adhesive and packable composite as a repair material. Methodology Metal cores (n = 21) were digitally designed and three-dimensionally printed by selective laser melting (SLM) technique. These cores were randomly divided into three groups. Group A (n = 8) was sandblasted with 50 μm aluminum oxide and veneered with light cure composite. Group B (n = 8) was sandblasted with 30 μm silica-coated particles and veneered with light cure composite. Group C control group (n = 5) was sandblasted in the laboratory with 250 μm aluminum oxide and veneered with porcelain. All specimens were tested for surface roughness by a stylus profilometer. After adding the veneering material, all specimens were subjected to a fracture resistance test through a universal testing machine. Results One-way analysis of variance test showed a significantly higher difference for the specimens sandblasted in the laboratory using 250 μm aluminum oxide. Fracture resistance values showed no significant difference between groups A and B. Conclusions Groups A and B showed no significant difference in surface roughness, but their fracture resistance values were above the acceptable clinical limit. Despite the rough nature of metal cores fabricated by the SLM technique, sandblasting with silica-coated particles may be an effective way to optimize the fracture resistance of the repair material because it provides the basis for chemical adhesion.
背景 金属陶瓷修复体最常遇到的问题之一是饰面瓷的断裂。本体外研究旨在评估用50μm氧化铝和30μm二氧化硅包覆颗粒进行临床喷砂处理对金属核表面粗糙度的影响，以及在添加特定粘合剂和可压实复合材料作为修复材料后对其抗折强度的后续影响。方法 金属核（n = 21）通过选择性激光熔化（SLM）技术进行数字化设计和三维打印。这些核被随机分为三组。A组（n = 8）用50μm氧化铝喷砂处理，并用光固化复合材料饰面。B组（n = 8）用30μm二氧化硅包覆颗粒喷砂处理，并用光固化复合材料饰面。C组对照组（n = 5）在实验室用250μm氧化铝喷砂处理，并用瓷饰面。所有标本均通过触针式轮廓仪测试表面粗糙度。添加饰面材料后，所有标本通过万能试验机进行抗折强度测试。结果 单因素方差分析测试显示，在实验室使用250μm氧化铝喷砂处理的标本存在显著更高的差异。A组和B组的抗折强度值无显著差异。结论 A组和B组在表面粗糙度上无显著差异，但其抗折强度值高于可接受的临床极限。尽管通过SLM技术制造的金属核表面粗糙，但用二氧化硅包覆颗粒喷砂处理可能是优化修复材料抗折强度的有效方法，因为它为化学粘附提供了基础。
