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不同牙科印模材料的力学行为和表面粗糙度分析。

Analysis of the Mechanical Behavior and Surface Rugosity of Different Dental Die Materials.

作者信息

Niekawa Ciro T, Kreve Simone, A'vila Gisseli Bertozzi, Godoy Gilmar Gil, Eduardo Vieira da Silva J R, Dias Sergio Candido

机构信息

Department of Restorative Dentistry, São Leopoldo Mandic Dental School, Campinas-São Paulo, Brazil.

出版信息

J Int Soc Prev Community Dent. 2017 Jan-Feb;7(1):34-40. doi: 10.4103/2231-0762.200706. Epub 2017 Feb 21.

DOI:10.4103/2231-0762.200706
PMID:28316947
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5343681/
Abstract

AIM

This work evaluated the mechanical and surface behavior of different die materials. The studied materials are polyurethane resin Exakto-Form (Bredent), Gypsum type IV, Fuji Rock EP (Gc), and Durone (Dentsply).

MATERIALS AND METHODS

Two metallic matrices molded in polyvinyl siloxane provided 30 cylindrical test specimens for the diametral compression test and 30 hemispherical test specimens for the surface rugosity test. The cylindrical test specimens were submitted to tests of diametral compression strength using a DL2000 universal assay machine, with a load cell of 2000 Kgf and constant speed of 1 mm/min connected to the software. Kruskal-Wallis and Dunn's nonparametric tests were used to analyze the results. The hemispheres were submitted to the surface rugosity assay using a SJ201-P rugosimeter with a sensitivity of 300 μm, speed of 0.5 mm/s, and cut-off of 0.8 mm, and the readings were taken on the convex surface of the test specimens and metallic matrix. Results were analyzed using with Fisher's least significant differences test (LSD) and Dunnett's test.

RESULTS

Kruskal-Wallis test showed significant difference between die materials for diametral compression strength ( = 0.002). Dunn's test showed significantly higher values for modified polyurethane resin (Exakto-Form). The gypsum type IV, which did not significantly differ regarding diametral compression strength, showed 34.0% (Durone) and 42.7% (Fuji Rock) lower values in comparison to Exakto-Form.

CONCLUSION

Within the parameters adopted in this study, it is possible to conclude that Exakto-Form polyurethane resin showed higher resistance to compression and was closer to the metallic matrix rugosity, and, along with the gypsum type IV Durone, showed better reproducibility of details relative to the Fuji Rock.

摘要

目的

本研究评估了不同模具材料的力学性能和表面性能。所研究的材料有聚氨酯树脂Exakto-Form（Bredent公司）、IV型石膏、富士洛克EP（Gc公司）和Durone（登士柏公司）。

材料与方法

用聚乙烯基硅氧烷模制的两个金属基体提供了30个用于径向压缩试验的圆柱形试样和30个用于表面粗糙度试验的半球形试样。圆柱形试样使用DL2000万能试验机进行径向压缩强度试验，该试验机配有2000 Kgf的测力传感器，并以1 mm/min的恒定速度连接到软件上。采用Kruskal-Wallis检验和邓恩非参数检验分析结果。半球形试样使用SJ201-P粗糙度仪进行表面粗糙度测定，其灵敏度为300μm，速度为0.5 mm/s，截止值为0.8 mm，读数在试样和金属基体的凸面上进行。结果采用Fisher最小显著差异检验（LSD）和邓尼特检验进行分析。

结果

Kruskal-Wallis检验表明，模具材料在径向压缩强度方面存在显著差异（ = 0.002）。邓恩检验表明，改性聚氨酯树脂（Exakto-Form）的值显著更高。IV型石膏在径向压缩强度方面没有显著差异，与Exakto-Form相比，其值分别比Durone低34.0%，比富士洛克低42.7%。

结论

在本研究采用的参数范围内，可以得出结论，Exakto-Form聚氨酯树脂具有更高的抗压性，并且更接近金属基体的粗糙度，并且与IV型石膏Durone一起，相对于富士洛克，在细节再现性方面表现更好。

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