基于数字印模和传统印模制作的压制及计算机辅助设计/计算机辅助制造陶瓷全冠的内部适合性。

Internal fit of pressed and computer-aided design/computer-aided manufacturing ceramic crowns made from digital and conventional impressions.

作者信息

Anadioti Evanthia, Aquilino Steven A, Gratton David G, Holloway Julie A, Denry Isabelle L, Thomas Geb W, Qian Fang

机构信息

Clinical Assistant Professor, Department of General Dentistry, Goldman School of Dental Medicine, Boston University, Boston, MA.

Professor, Department of Prosthodontics, The University of Iowa College of Dentistry, Iowa City, Iowa.

出版信息

J Prosthet Dent. 2015 Apr;113(4):304-9. doi: 10.1016/j.prosdent.2014.09.015. Epub 2014 Dec 6.

DOI:10.1016/j.prosdent.2014.09.015

PMID:25488521

Abstract

STATEMENT OF PROBLEM

No studies have evaluated the internal adaptation of pressed and milled ceramic crowns made from digital impressions.

PURPOSE

The purpose of this in vitro study was to evaluate the internal fit of pressed and milled ceramic crowns made from digital and conventional impressions.

MATERIAL AND METHODS

Thirty polyvinyl siloxane (PVS) impressions and 30 Lava COS impressions made of a prepared dentoform tooth (master die) were fabricated. Thirty crowns were pressed in lithium disilicate (IPS e.max Press), and 30 crowns were milled from lithium disilicate blocks (IPS e.max CAD) (15/impression technique) with the E4D scanner and milling engine. The master die and the intaglio of the crowns were digitized with a 3-dimensional laser coordinate measurement machine. The digital master die and intaglio of each crown were merged. The distance between the die and the intaglio surface of the crown was measured at 3 standardized points. One-way ANOVA was used for statistical analysis (α=.05).

RESULTS

One-way ANOVA revealed that the internal gap obtained from the Lava/press group (0.211 mm, ±SD 0.041) was significantly greater than that obtained from the other groups (P<.001), while no significant differences were found among PVS/press (0.111 mm ±SD 0.047), PVS/CAD/CAM (0.116 mm ±SD 0.02), and Lava/CAD/CAM (0.145 mm ±SD 0.024).

CONCLUSIONS

The combination of the digital impression and pressed crown produced the least accurate internal fit.

摘要

问题陈述

尚无研究评估由数字印模制作的压制和铣削陶瓷冠的内部适应性。

目的

本体外研究的目的是评估由数字印模和传统印模制作的压制和铣削陶瓷冠的内部适合性。

材料与方法

制作30个由预备好的牙模型（母模）制取的聚乙烯基硅氧烷（PVS）印模和30个Lava COS印模。30个冠用二硅酸锂压制而成（IPS e.max Press），30个冠用E4D扫描仪和铣削机从二硅酸锂块体（IPS e.max CAD）铣削而成（每种印模技术15个）。用三维激光坐标测量仪将母模和冠的内表面数字化。将每个冠的数字母模和内表面合并。在3个标准化点测量母模与冠内表面之间的距离。采用单因素方差分析进行统计分析（α = 0.05）。

结果

单因素方差分析显示，Lava/压制组获得的内部间隙（0.211 mm，标准差±0.041）显著大于其他组（P < 0.001），而PVS/压制组（0.111 mm±标准差0.047）、PVS/CAD/CAM组（0.116 mm±标准差0.02）和Lava/CAD/CAM组（0.145 mm±标准差0.024）之间未发现显著差异。