不同底层结构设计的氧化锆全瓷冠的透明度效果。

The effect of translucency of Y-TZP based all-ceramic crowns fabricated with difference substructure designs.

机构信息

Department of Prosthodontics and Operative Dentistry, Tufts University School of Dental Medicine, One Kneeland Street, Boston, MA 02111, USA.

出版信息

J Dent. 2013 Aug;41 Suppl 3:e87-92. doi: 10.1016/j.jdent.2012.10.005.

DOI:10.1016/j.jdent.2012.10.005

PMID:23079282

Abstract

PURPOSE

To analyse the effect of translucency of Y-TZP based all-ceramic crowns fabricated with different substructure thicknesses and extensions. The effect of restoration shading is also investigated.

MATERIALS AND METHODS

A maxillary right central incisal typodont tooth was prepared and a die was fabricated with Type IV stone after making impression. Horizontally and vertically reduced substructure extensions were designed at the facial cervical part with 0.3 mm and 0.5mm thick Lava Y-TZP. Each substructure was fabricated with two different shades, FS1 and FS7. A1 shade veneering porcelain was applied on FS1 shade Y-TZP substructures and D3 shade veneering porcelain was applied on FS7 shade Y-TZP substructures with lost wax and press ceramic technique. Ten specimens were fabricated for a total of 8 groups. The cervical and body colour of specimens were analysed with a spectrophotometer, after placing specimens on the two different coloured abutment teeth using translucent try-in cement. The data were obtained in CIELAB colour coordinates Lab*, and DE* through the test specimens over ND1 and ND8 shade abutments were calculated.

RESULTS

At the cervical area, there was a significant difference on substructure extension (P < 0.001). At the body area, results were borderline on substructure thickness (P = 0.05) and there was a significant difference on restoration shade (P = 0.001).

CONCLUSIONS

Vertical reduction design of Y-TZP substructure could increase DE* at the cervical area. Decreasing thickness of Y-TZP substructure may increase DE* at the body area. Increasing the value of Y-TZP based-all ceramic crown shade could increase DE* at the body area.

CLINICAL SIGNIFICANCE

The translucency of a Y-TZP based all-ceramic crowns may influence its esthetic outcome when it is used on a discoloured abutment tooth. Clinicians should be aware of the effect of substructure design on the translucency of YTZP based all-ceramic crowns.

摘要

目的

分析不同底层厚度和延伸度的 Y-TZP 全瓷冠的透光性效果，并研究修复体遮色的效果。

材料和方法

预备上颌右中切牙模型，用 IV 型石膏灌模。在唇面颈缘设计 0.3mm 和 0.5mm 厚的 Lava Y-TZP 水平和垂直缩窄底层延伸，每个底层用 FS1 和 FS7 两种不同色调制作。FS1 色调 Y-TZP 底层用 A1 色调饰面瓷，FS7 色调 Y-TZP 底层用 D3 色调饰面瓷，采用失蜡和压力陶瓷技术。共制作 10 个试件，共 8 组。用半透明试色水泥将试件放置在两种不同颜色的基牙上，用分光光度计分析试件的颈缘和体部颜色。通过测试试件在 ND1 和 ND8 色调基牙上的 DE值，计算试件在 CIELAB 颜色坐标 Lab和 DE*中的数据。