IMMEDIATE SHADE VERIFICATION SYSTEM FOR CERAMIC RESTORATIONS

用于陶瓷修复体的即时色彩验证系统

• 批准号: 3775637
• 负责人: BENJAMIN M WU
• 金额: --
• 依托单位: HARVARD MEDICAL SCHOOL
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3775637
• 关键词: ceramics; chemical binding; dental materials; dental research; method development; polymers; polymethacrylate; surface property; tooth surface

To achieve an exact color match for a single anterior ceramic restoration is one of the most challenging tasks in fixed prosthodontics. Many methods have been described in the literature to facilitate this process. The most promising solution utilizes an organic liquid binder with a specific index of refraction(1.49 to 1.51) which matches that of dental porcelain. When mixed with un-dyed pre-sintered dental porcelain, the binder allows immediate, direct visualization of the post-sintered porcelain color. More than a custom shade-tab, this technique provides the laboratory ceramist with precise information on the color, location, and thickness of all the porcelain layers that produced the verifies, desirable esthetic effects. A drawback is that the organic liquid binder-porcelain powder mixture remains in a liquid state, which makes transport difficult. In our approach, a mixture of visible light-cured(VLC) polymers with the proper refractive index is being considered as possible replacement or addition to the organic binder. Earlier results, using only polymers such as bisphenol-glycidyl methacrylate, urethane dimethacrylate, and triethylene glycol- demethacrylate, demonstrated that the molar volume of porcelain powder in the polymer-ceramic mixture is critical. A 5% variation can result in significant optical differences. This renders the technique unpractical because one would need to make precise measurements for each of the dental porcelain systems. Some porcelain systems, such as the Vita Omega, have over 70 powders. Furthermore, the required molar volume often produced excessively viscous mixtures with poor handling characteristics. My recent work suggests that powder molar volume is less critical when a VLC polymer-organic binder mixture is used. However, color stability is questionable due to possible chemical degradation of the polymers by the organic components. Chemically compatible polymer- organic liquid combinations are being considered for the proper optical properties. Shade tabs of post-sintered ceramics have been fabricated for comparison with the polymer-organic liquid-powder mixtures. Keywords: refractive index, dental porcelains, polymers, color

为了实现单个前牙陶瓷的精确颜色匹配， 修复是修复中最具挑战性的任务之一， 修复学 文献中描述了许多方法 以促进这一进程。 最有前途的解决方案是利用 具有特定折射率（1.49）的有机液体粘合剂 至1.51），其与牙科瓷相匹配。 掺入 未染色的预烧结牙科瓷，粘合剂允许立即， 烧结后瓷颜色的直接可视化。 更 比一个自定义的shade-tab，这项技术提供了实验室 陶艺家的精确信息的颜色，位置， 制作验证码的所有瓷层厚度， 理想的美学效果。 缺点是有机液体 粘结剂-瓷粉混合物保持液态， 使得运输困难。 在我们的方法中， 具有适当折射率的光固化（VLC）聚合物正在 被认为是可能的替代或补充有机 粘合剂。 早期的结果，仅使用聚合物，如双酚-缩水甘油 甲基丙烯酸酯、氨基甲酸酯二甲基丙烯酸酯和三甘醇- 脱甲基丙烯酸酯，表明瓷的摩尔体积 聚合物-陶瓷混合物中的粉末是关键的。 5%的变化 可能导致显著的光学差异。 这使得 技术不实用，因为需要精确地 每个牙科瓷系统的测量值。 一些 陶瓷系统如Vita Omega具有超过70种粉末。 此外，所需的摩尔体积常常过度产生， 粘性混合物，处理特性差。 我最近 工作表明，当VLC时，粉末摩尔体积不太重要， 使用聚合物-有机粘合剂混合物。 颜色稳定性 由于可能的化学降解， 聚合物由有机成分组成。 化学相容聚合物- 有机液体组合正在考虑适当的 光学性质 后烧结陶瓷的遮光片已经被 制造用于与聚合物-有机液体-粉末进行比较 混合物。 关键词：折射率，牙科陶瓷，聚合物，颜色