The Effect of Try-in Paste Shade and Framework Design on the Color Characteristics of Dental Zirconia Restorations.

Abolghasem Mohammadi, Alireza Gerami, Sara Tavakolizadeh, Rahab Ghoveizi, Ehsan Rouhollahpour Ahangar
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Abstract

Background: Favorable esthetic and mechanical qualities, together with rapid advancements in CAD/CAM technology, have increased the adoption of zirconia restorations. Despite acceptable optical characteristics of zirconia, achieving natural tooth color resemblance remains challenging.

Purpose: This study was conducted to determine how the try-in paste shade, tooth region, and framework design affect the color properties of zirconia restorations.

Materials and method: In this in vitro study, a maxillary central incisor was prepared and scanned. Frameworks with four different designs were fabricated. Ten crowns were designed in each group categorized as simple core (SC), dentin core (DC), trestle design core (TC), and monolithic crown (MC). Veneering was performed for all groups except MC. Subsequently, all crowns were cemented with try-in paste Bisco CHOICE 2 cement in shades A1-A3 and B1. The color data (Lab) were determined using the SpectroShade Micro II device. Color difference (ΔE) with the Lab B2 color sample as the target color was calculated using the CIE ΔE 2000 formula. Data analysis was performed using the repeated measure ANOVA test.

Results: Zirconia core design, tooth region and cement shade, significantly impacted the ΔE and there were interactions among these factors. The highest ΔE was observed when no cement was used, while the lowest ΔE was observed with A2 cement. Among the various framework designs, the lowest and highest ΔEs were observed in MC and, SC frames, respectively (p Value < 0.05).

Conclusion: In the light of the findings of current study, minimum ΔE can be achieved with trestle design framework at the middle portion of the tooth. The try-in paste shade also has a considerable impact on the final ΔE value.

试入膏体色度及框架设计对氧化锆牙体修复体颜色特性的影响。
背景:良好的美学和机械品质,以及CAD/CAM技术的快速发展,增加了氧化锆修复体的采用。尽管氧化锆具有可接受的光学特性,但实现天然牙齿颜色相似仍然具有挑战性。目的:研究试入膏体色度、牙区、框架设计对氧化锆修复体颜色特性的影响。材料与方法:制备上颌中切牙并进行扫描。制作了四种不同设计的框架。每组设计10个冠,分为简单核(SC)、牙本质核(DC)、支架设计核(TC)和整体冠(MC)。除MC组外,所有组均进行贴面。随后,所有冠在A1-A3和B1区使用试入膏体Bisco CHOICE 2水泥进行胶结。颜色数据(实验室)使用SpectroShade Micro II设备测定。使用CIE ΔE 2000公式计算Lab B2颜色样品作为目标颜色的色差(ΔE)。数据分析采用重复测量方差分析。结果:氧化锆核设计、牙区和骨水泥阴影对ΔE有显著影响,且三者之间存在交互作用。未使用水泥时最高ΔE,使用A2水泥时最低ΔE。在各种框架设计中,MC和SC框架的得分分别最低和最高ΔEs (p值< 0.05)。结论:根据目前的研究结果,在牙齿中部采用支架设计框架可以达到最小ΔE。试入膏体色度对最终ΔE值也有相当大的影响。
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