State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China.
State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China; Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, China.
J Dent. 2019 Apr;83:87-94. doi: 10.1016/j.jdent.2019.02.010. Epub 2019 Mar 5.
The present study examined the effect of food medium on the three-body wear behaviour of veneering porcelain derived from porcelain-fused-to-metal crowns.
Seventy-four rectangular metal-ceramic specimens were prepared using Ceramco III as the veneering porcelain. After storage in distilled water at 37 °C for 2 days, the specimens were tested with a custom-designed chewing machine with a stainless steel ball as antagonist (350 N loads, 2.4 × 10 cycles). Testing was performed using water, silica beads, poly(methyl) methacrylate beads, millet seed slurry, chicken slurry or celery slurry as abrasive medium. Wear analysis of the veneering porcelain was performed using a 3D profilometer after every 300,000 wear cycles and analysed with one-way analysis of variance and post-hoc pairwise comparison procedures. Worn surfaces were examined with scanning electron microscopy.
The wear curves of all experimental groups demonstrated three wear stages (running-in, steady wear and severe wear) with characteristic microstructure of worn surfaces. All the three food items selected in the present study (celery, chicken and millet seeds) had lower hardness compared with the veneering porcelain and produced less abrasion of the porcelain than a two-body wear system (water only). Abrasive wear produced with silica particles was the highest for the veneering porcelain.
The wear process of veneering porcelain in porcelain-fused-to-metal restorations is affected by the type of food consumed during mastication.
Excessive abrasion may lead to premature failure of porcelain-fused-to-metal restorations. The importance of the wear behaviour of dental ceramic materials cannot be overstated. Three-body wear is an unavoidable consequence of oral function and occurs daily during eating. Understanding the effect of food particles on the wear behaviour of dental porcelain provides insight into the clinical performance and durability of these restorations.
本研究探讨了食物介质对烤瓷熔附金属全冠修复用饰面瓷三体磨耗行为的影响。
采用 Ceramco III 作为饰面瓷，制备 74 个矩形金属陶瓷试件。在 37°C 的蒸馏水中储存 2 天后，使用定制设计的咀嚼机和不锈钢球作为拮抗剂（350N 载荷，2.4×10 循环）对试件进行测试。测试时，采用水、硅珠、聚甲基丙烯酸甲酯珠、小米浆、鸡浆或芹菜浆作为磨料介质。每 30 万次磨损循环后，使用三维轮廓仪对饰面瓷进行磨损分析，并采用单向方差分析和事后两两比较程序进行分析。用扫描电子显微镜观察磨损表面。
所有实验组的磨损曲线均表现出三个磨损阶段（磨合、稳定磨损和严重磨损），具有磨损表面的特征微观结构。本研究中选择的三种食物（芹菜、鸡肉和小米）的硬度均低于饰面瓷，与二体磨损系统（仅水）相比，对瓷的磨损较少。硅颗粒产生的磨料磨损对饰面瓷的磨损最高。
烤瓷熔附金属修复体中饰面瓷的磨损过程受咀嚼过程中所消耗食物类型的影响。
过度磨损可能导致烤瓷熔附金属修复体的早期失效。对牙科陶瓷材料磨损行为的重要性怎么强调都不为过。三体磨损是口腔功能不可避免的后果，每天进食时都会发生。了解食物颗粒对牙科瓷磨损行为的影响，有助于深入了解这些修复体的临床性能和耐用性。
