The surface hardness layer analysis of the titanium casting manufactured by two different titanium casting investment material

doi:10.3877/cma.j.issn.1674-1366.2011.06.004

Abstract

Abstract:

Objective

To investigate the micro-hardness of the titanium castings manufactured by a new investment for titanium casting.

Methods

Six titanium casting specimens（20 mm × 20 mm × 1.5 mm） were divided into two groups and cast by a new titanium investment material and Rematitan Plus investment material， respectively.Micro-hardness was measured by a micro-hardness instrument （Leitz Wetzlar， Germany） under a load of 200 g for 5 s at different points from the surface to the interior on sections of specimens embedded in acrylic resin.The thickness of the micro-hardness layers of the two titanium castings was compared.

Results

Vicker's hardness of the tested specimens was higher at the surface layers than in the inner layers.However， the increasing rate of the hardness at the surface layer is smaller with the new titanium investments than with Rematitan Plus investments.The micro-hardness layer of the titanium casting manufactured by the new titanium investments is 50 μm through the cross-section of the surface， thinner than that of Rematitan Plus' （140 μm）.

Conclusions

The new titanium investments were more suitable for titanium casting than the Rematitan Plus investments.Titanium castings， such as crowns， removable partial denture frame-works， could be manufactured successfully by the new titanium investments.

Key words: Micro-hardness, Surface hardness layer, Investments, Titanium

Qin-ye LIANG, Xia-yi WU. The surface hardness layer analysis of the titanium casting manufactured by two different titanium casting investment material[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(06): 577-583.

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Figures/Tables 8

References 10

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组别	深度（μm）	测量位点			维氏显微硬度
组别	深度（μm）	a	b	c	维氏显微硬度
1	10	254	272	240	255.33 ± 16.042
2	30	172	190	188	183.33 ± 9.866
3	50	152	157	155	154.67 ± 2.517
4	70	149	151	152	150.67 ± 1.528
5	90	150	149	151	150.00 ± 1.000
6	140	148	143	153	147.67 ± 4.509
7	190	143	145	147	145.00 ± 2.000

组别	深度（μm）	测量位点			维氏显微硬度
组别	深度（μm）	a	b	c	维氏显微硬度
1	10	254	272	240	255.33 ± 16.042
2	30	172	190	188	183.33 ± 9.866
3	50	152	157	155	154.67 ± 2.517
4	70	149	151	152	150.67 ± 1.528
5	90	150	149	151	150.00 ± 1.000
6	140	148	143	153	147.67 ± 4.509
7	190	143	145	147	145.00 ± 2.000

	SS	df	MS	F	Sig.
组间变异	28 771.905	6	4795.317	86.365	0.000
组内变异	777.333	14	55.524
合计	29 549.238	20

	SS	df	MS	F	Sig.
组间变异	28 771.905	6	4795.317	86.365	0.000
组内变异	777.333	14	55.524
合计	29 549.238	20

组别	P	95%可信区间		对比组	P	95%可信区间
组别	P	下限	上限	对比组	P	下限	上限
1-2*	0.000	51.2254	92.7746	3-4	0.993	-16.7746	24.7746
1-3*	0.000	79.8921	121.4412	3-5	0.985	-16.1079	25.4412
1-4*	0.000	83.8921	125.4412	3-6	0.901	-13.7746	27.7746
1-5*	0.000	84.5588	126.1079	3-7	0.691	-11.1079	30.4412
1-6*	0.000	86.8921	128.4412	4-5	01.00	-20.1079	21.4412
1-7*	0.000	89.5588	131.1079	4-6	0.999	-17.7746	23.7746
2-3*	0.005	7.8921	49.4412	4-7	0.961	-15.1079	26.4412
2-4*	0.001	11.8921	53.4412	5-6	1.000	-18.4412	23.1079
2-5*	0.001	12.5588	54.1079	5-7	0.978	-15.7746	25.7746
2-6*	0.001	14.8921	56.4412	6-7	0.999	-18.1079	23.4412
2-7*	0.000	17.5588	59.1079

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