The effect of mold temperature on castability of CP Ti and Ti–6Al–4V castings into phosphate bonded investment materials

Oliveira, Pedro César Garcia de; Adabo, Gelson Luís; Ribeiro, Ricardo Faria; Rocha, Sicknan Soares da

doi:10.1016/j.dental.2005.09.004

Cited by 42 publications

(33 citation statements)

References 25 publications

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“…Currently, research to improve the titanium-ceramic bond strength continues and this includes methods to prevent the formation of excessive and non-adherent oxide layer during ceramic firing (10). With respect to casting accuracy of CPTi, it was also difficult to compare results of this experiment with those of previous investigations because of differences in the methodologies used to evaluate marginal accuracy (17,18). In the present study, marginal accuracy measurements depended on a stylized metal die simulating the configuration of a tooth prepared to receive a cast metal complete crown.…”

Section: Discussioncontrasting

confidence: 42%

“…The extreme temperature difference between mold and molten titanium causes the cast metal to cool rapidly, reducing the time for gas to escape from the mold, disturbing adequate mold filling, and causing defective castings (12). Although higher mold temperatures may improve the casting accuracy of titanium crowns by increasing the flow molten metal during injection in the mold (17,18), it may increase α-case layer thickness (15,16), weakening titanium-ceramic bond (8,19).…”

Section: Introductionmentioning

confidence: 99%

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Effect of investment type and mold temperature on casting accuracy and titanium-ceramic bond

2013

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This study evaluated the casting accuracy of crown margins and metal-ceramic shear bond strength (SBS) of pure titanium injected into casting molds made using 2 investment types at 3 mold temperatures. Sixty crown (30-degree beveled finish line) and 60 cylinder (5 mm diameter x 8 mm high) patterns were divided into 6 groups (n=10), and cast using a phosphate-bonded investment (P) and a magnesium oxide-bonded investment (U), at 400°C (groups P400 and U400), 550°C (groups P550 and U550) and 700°C (groups P700 and U700) mold temperatures. Crown margins were recorded in impression material, the degree of marginal rounding was measured and margin length deficiencies (µm) were calculated. Titanium-ceramic specimens were prepared using Triceram ceramic (2 mm high) and SBS was tested. Failure modes were assessed by optical microscopy. Data were subjected to two-way ANOVA and Tukey's HSD test (α=0.05). For casting accuracy, expressed by marginal deficiency (µm), investment U provided more accurate results (64 ± 11) than P (81 ± 23) (p<0.001). The increase in temperature resulted in different effects for the tested investments (p<0.001), as it provided better casting accuracy for U700 (55 ± 7) and worse for P700 (109 ± 18). Casting accuracy at 700°C (82 ± 31) was significantly different from 400°C (69 ± 9) and 550°C (68 ± 9) (p<0.05). For SBS, there was no significant differences among the groups for factors investment (p=0.062) and temperature (p=0.224), or for their interaction (p=0.149). Investment U provided better casting accuracy than investment P. The SBS was similar for all combinations of investments and temperatures.

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Section: Discussioncontrasting

confidence: 42%

Section: Introductionmentioning

confidence: 99%

Effect of investment type and mold temperature on casting accuracy and titanium-ceramic bond

2013

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“…As previously described 10 , Nylon mesh patterns (n = 5) (14 × 14 mm, with 49 internal squares and 0.5-mm filament diameters) were used to measure the castability. They were attached to 2 wax runner bars of 4.0 mm in diameter placed along the 2 edges at angles of 90 degrees.…”

Section: Castability Testmentioning

confidence: 99%

“…The most common investments used for titanium are phosphate-bonded investments based on silica phases (crystalline quartz or cristobalite) that are inexpensive and exhibit a thermal expansion compatible with Ti casting shrinkage 4 . However, SiO 2 can be reduced by Ti, and this affects the physical and mechanical properties of the titanium castings [5][6][7][8][9][10][11][12] . On the other hand, spinel-based investments produce enough thermal expansion to compensate for the Ti casting shrinkage and produce a minor reaction layer thickness but are more expensive 10,[13][14][15][16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

“…However, SiO 2 can be reduced by Ti, and this affects the physical and mechanical properties of the titanium castings [5][6][7][8][9][10][11][12] . On the other hand, spinel-based investments produce enough thermal expansion to compensate for the Ti casting shrinkage and produce a minor reaction layer thickness but are more expensive 10,[13][14][15][16][17][18][19][20][21] . Another concern about titanium castings is deficient mold filling that may be related to the casting machine, temperature gradient between molten metal and mold temperature, and reactions between molten titanium and investment materials, beyond permeability of the investment [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

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A quality assessment of titanium castings produced in an experimental short-heating-cycle investment

et al. 2013

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The aim of this study was to evaluate the quality of casting produced in an experimental short-term heating-cycle investment. Thus, reaction layer and castability of titanium casting using an experimental spinel-based investment (VR) with short heating cycle were compared with the commercial short-heating-cycle spinel-based investment Trinell (TR), the silica-phosphate-based investment Rematitan Plus (RP), and the conventional spinel-based investment Rematitan Ultra (RU). VR has polymeric fibers added to inorganic particles. Reaction layer assessments were carried out using Vickers hardness and elemental analysis using dispersive X-ray microanalysis (EDX). Mesh patterns were used for castability test, and powder characterization was made by scanning electron microscopy (SEM). Hardness evaluation showed no difference among the investments between 100 and 200 µm. The most important contaminant element for VR, TR, and RU was oxygen. Higher levels of mold filling were found for TR, VR, and RU compared with that obtained with RP. The quality of castings, characterized by means of the assessments of reaction layer and castability, made from the VR was similar to the commercial investments TR and RU but superior to the RP.

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Ti–Ge binary alloy system developed as potential dental materials

Lin¹,

Wang²,

Qiu³

et al. 2012

J Biomed Mater Res

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As-cast Ti-xGe (x = 2, 5, 10, 20 wt %) binary alloys were produced in this work, and various experiments were carried out to investigate the microstructure, mechanical properties, in vitro electrochemical and immersion corrosion behaviors as well as cytotoxicity with as-cast pure Ti as control, aiming to study the feasibility of Ti-xGe alloy system as potential dental materials. The microstructure of Ti-xGe alloys changes from single α-Ti phase to α-Ti + Ti(5)Ge(3) precipitation phase with the increase of Ge content. Mechanical tests show that Ti-5Ge alloy has the best comprehensive mechanical properties. The corrosion behavior of Ti-xGe alloys in artificial saliva with different NaF and lactic acid addition at 37°C indicates that Ti-2Ge and Ti-5Ge alloys show better corrosion resistance to fluorine-containing solution. The cytotoxicity test indicates that Ti-xGe alloy extracts show no obvious reduction of cell viability to L-929 fibroblasts and MG-63 osteosarcoma cells, similar to pure Ti which is generally acknowledged to be biocompatible. Considering all these results, Ti-2Ge and Ti-5Ge alloys possess the optimal comprehensive performance and might be used as potential dental materials.

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The effect of mold temperature on castability of CP Ti and Ti–6Al–4V castings into phosphate bonded investment materials

Cited by 42 publications

References 25 publications

Effect of investment type and mold temperature on casting accuracy and titanium-ceramic bond

Effect of investment type and mold temperature on casting accuracy and titanium-ceramic bond

A quality assessment of titanium castings produced in an experimental short-heating-cycle investment

Ti–Ge binary alloy system developed as potential dental materials

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