Resin strengthening of dental ceramics to prevent fracture of restorations in service

树脂强化牙科陶瓷以防止修复体在使用中断裂

• 批准号: EP/H028617/1
• 负责人: Owen Addison
• 金额: $ 12.55万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH028617%2F1
• 关键词: Resin; strengthening; dental; ceramics; prevent

Missing or damaged tooth structure is routinely replaced by dental practitioners to prevent patients from experiencing pain, sensitivity and infection, in addition to restoring function and dental aesthetics. Tooth restoration may be performed directly in the mouth or indirectly by cementing a pre-fabricated restoration to the prepared tooth. Indirect techniques offer the dental operator greater control over the shape and form of the ultimate restoration and of the materials currently available, dental ceramics are most equipped to mimic tooth structure in shade, translucency and lustre. However, the major criticism levelled at dental ceramic restorations is their susceptibility to fracture in service and despite extensive engineering to increase the strength of these materials the data from clinical studies suggest the annual failure rate to be approximately 3-5%. Failure of dental restorations has high cost implications to both the patient and the relevant health authority both in terms of the cost of the revision dentistry and in terms of time required to attend appointments.Dental practitioners have a choice of different classes of cement materials available to use to secure dental ceramic restorations in the mouth. Of these, resin-based cements, which can adhesively bond to both the tooth and some dental ceramic materials, have been shown to reduce likelihood of fracture of the ceramic restoration in service. It is understood that the improved performance with these materials occurs because the resin-based cement interacts with the flaws on the surface of the ceramic from which a crack may propagate. However, the strengthening mechanism(s) is poorly understood thereby preventing the optimisation of the clinical techniques and the cementation materials required to exploit the available reinforcement. The proposed research aims to carefully characterise the strengthening mechanism and to begin to identify the material characteristics of the resin-based cement that are required to provide the most significant and durable reinforcement of dental ceramic restorations. Using these learnings, further efforts will be made to develop novel resin-coatings and processing routes that strengthen the dental ceramic and that may be applied prior to cementation. It is hoped that the outcomes of this study will be readily translatable into the provision of clinical protocols and development of optimised and/or novel materials that will reduce the incidence of premature fracture of dental ceramic restorations in service. The research is performed in close conjunction with clinical experts, industrial collaborators and international academic partners.

缺失或损坏的牙齿结构通常由牙科医生替换，以防止患者经历疼痛，敏感和感染，以及恢复功能和牙齿美观。牙齿修复可以直接在口腔中进行，也可以通过将预制修复体粘合到准备好的牙齿上间接进行。间接技术为牙科医生提供了更好的控制最终修复的形状和形式，以及目前可用的材料，牙科陶瓷最能在阴影、半透明和光泽上模仿牙齿结构。然而，对牙科陶瓷修复体的主要批评是它们在使用中容易断裂，尽管大量的工程增加了这些材料的强度，但临床研究的数据表明，每年的故障率约为3-5%。牙科修复失败对病人和有关卫生当局都有很高的费用影响，无论是牙科翻修的费用还是参加预约所需的时间。牙科医生可以选择不同种类的水泥材料来固定口腔中的牙科陶瓷修复体。其中，树脂基骨水泥可以粘合牙齿和一些牙科陶瓷材料，已被证明可以减少陶瓷修复在使用中断裂的可能性。可以理解，这些材料性能的改善是因为树脂基水泥与陶瓷表面的裂纹相互作用，裂纹可能由此扩展。然而，强化机制尚不清楚，因此阻碍了临床技术的优化和利用可用强化所需的胶结材料。提出的研究旨在仔细表征强化机制，并开始确定树脂基水泥的材料特性，以提供牙科陶瓷修复体最显著和持久的增强。利用这些知识，将进一步努力开发新的树脂涂层和加工路线，以加强牙科陶瓷，并可能在胶结之前应用。希望这项研究的结果能够很容易地转化为临床方案的提供和优化和/或新型材料的开发，以减少牙科陶瓷修复体在使用中过早断裂的发生率。这项研究是与临床专家、工业合作者和国际学术伙伴密切合作进行的。

项目成果

The impact of resin-coating on sub-critical crack extension in a porcelain laminate veneer material.

树脂涂层对瓷层压板材料亚临界裂纹扩展的影响。

• DOI: 10.1016/j.dental.2017.02.004
• 发表时间: 2017
• 期刊: official publication of the Academy of Dental Materials
• 作者: Cao X