Gnathos Dental Studio, Weston, MA, USA.
J Esthet Restor Dent. 2010 Feb;22(1):53-63. doi: 10.1111/j.1708-8240.2009.00312.x.
Color reproduction of an anterior tooth requires advanced laboratory techniques, talent, and artistic skills. Color matching in a laboratory requires the successful transfer from in vivo with careful considerations. The purpose of this study was to monitor and verify the color reproduction process for an anterior all-ceramic crown in a laboratory through spectrophotometric measurements. Furthermore, a crown insertion process using composite luting cements was assessed, and the final color match was measured and confirmed. An all-ceramic crown with a zirconia ceramic coping for the maxillary right central incisor was fabricated. There was a significant color difference between the prepared tooth and the die material. The die material selected was the closest match available. The ceramic coping filled with die material indicated a large color difference from the target tooth in both lightness and chromaticity. During the first bake, three different approaches were intentionally used corresponding with three different tooth regions (cervical, body, and incisal). The first bake created the fundamental color of the crown that allowed some color shifts in the enamel layer, which was added later. The color of the completed crown demonstrated an excellent color match, with Delta E 1.27 in the incisal and 1.71 in the body. In the cervical area, color match with Delta E 2.37 was fabricated with the expectation of a color effect from the underlying prepared tooth. The optimal use of composite luting cement adjusted the effect from the underlying prepared tooth color, and the color match fabricated at a laboratory was successfully transferred to the clinical setting. The precise color measurement system leads to an accurate verification of color reproduction and its transfer. CLINICAL SIGNIFICANCE The use of a dedicated dental spectrophotometer during the fabrication of an all-ceramic crown allows the dentist and the laboratory technician to accurately communicate important information to one another about the shade of the tooth preparation, the shade of the contralateral target tooth, and the influence of luting cement on the final restoration, thereby allowing the technician better control over the outcome of their tooth color matching efforts and the final color match of an all-ceramic restoration.
前牙的颜色再现需要先进的实验室技术、人才和艺术技巧。实验室中的颜色匹配需要经过精心考虑，成功地从体内转移。本研究的目的是通过分光光度测量来监测和验证实验室中全瓷冠的颜色再现过程。此外，评估了使用复合粘固水门汀的牙冠插入过程，测量并确认了最终的颜色匹配。为上颌右中切牙制作了带有氧化锆陶瓷基底的全陶瓷冠。预备牙与代型材料之间存在明显的颜色差异。所选代型材料是最接近的匹配。填充代型材料的陶瓷基底在明度和色度上与目标牙均有较大的颜色差异。在第一次烧制过程中，根据三个不同的牙体区域（颈部、体部和切端）分别使用了三种不同的方法。第一次烧制形成了牙冠的基本颜色，使釉质层的颜色略有偏移，之后再添加。完成后的牙冠颜色匹配效果极好，切端 Delta E 为 1.27，体部 Delta E 为 1.71。在颈部区域，使用 Delta E 为 2.37 的牙冠颜色匹配，期望从预备牙底层获得颜色效果。复合粘固水门汀的最佳使用调整了底层预备牙颜色的影响，实验室制作的颜色匹配成功转移到临床环境中。精确的颜色测量系统可准确验证颜色再现及其转移。临床意义在全瓷冠制作过程中使用专用牙科分光光度计可使牙医和实验室技术员准确地相互传达有关牙预备体色调、对侧目标牙色调以及粘固水门汀对最终修复体的影响的重要信息，从而使技术员更好地控制其牙色匹配工作的结果和全瓷修复体的最终颜色匹配。
