Effect of investment composition ratio for pure titanium crown and bridge on some mechanical properties of mould
10.3760/cma.j.issn.1002-0098.2011.11.011
- VernacularTitle:纯钛铸造包埋材料成分对铸型力学性能的影响
- Author:
Se-Fei YANG
1
;
You-Xu WANG
;
Tian-Wen GUO
;
Hong-Chen LIU
Author Information
1. 解放军总医院
- Keywords:
Dental casting technique;
Titanium;
Investment;
Mould
- From:
Chinese Journal of Stomatology
2011;46(11):688-691
- CountryChina
- Language:Chinese
-
Abstract:
Objective To determine the optimal composition of a self-developing investment material by measuring physical and mechanical properties of mould.Methods L9 ( 34 ) orthogonal design was adopted.One hundred and fifty specimens with the size of 80 mm x 20 mm x 20 mm were prepared to measure the atmospheric temperature bending strength,high temperature bending strength and residual bending strength.Nine specimens with the size of 5 mm diameter 25 mm heigh were prepared to survey the thermal expansion curve from ambient temperature to 1150 ℃.Results Strengths were greatly affected by fine powder proportion in refractory and water/powder ratio.When the content of fine powder was 35 ％ and water/powder ratio was 1∶ 7.5,adequate atmospheric temperature strength and high temperature strength could be achieved.Moreover,the residual strength was moderate.The thermal extension curves of specimens in experiment group were almost similar.And the average linear expansion coefficient was (4 ～ 5 ) x 10-6/℃.Conclusions The three kinds of bending strength of self-developing investment material are compared with commercialized investment material for titanium casting when water/powder ratio and the content of fine powder are carefully controlled.
