Application of laser measuring, numerical simulation and rapid prototyping to titanium dental castings

Wu, Menghuai; Tinschert, Joachim; Augthun, M; Wagner, I.; Schädlich-Stubenrauch, J.; Sahm, Peter R.; Spiekermann, Hubertus

doi:10.1016/s0109-5641(00)00037-3

Cited by 56 publications

(41 citation statements)

References 14 publications

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“…Mold filling and dimensional accuracy in titanium castings is not only affected by the type of investment and its heating schedule but also by the sprue design [18][19][20][21]. In the present investigation a simple geometry of the patterns allowed a simple sprue design with direct feeding.…”

Section: Discussionmentioning

confidence: 89%

Mold filling and dimensional accuracy of titanium castings in a spinel-based investment

2010

The Journal of Prosthetic Dentistry

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OBJECTIVES: Aim of the study was to analyze the mold filling capacity and the dimensional accuracy of a spinel-based investment for titanium castings. METHODS: Expansion of the investment in dependence of the preheating temperature was measured in a dilatometer. The degree of transformation of MgO and Al2O3 to spinel (MgAl2O4) was evaluated by means of X-ray powder diffraction. Mold filling capacity was assessed by casting a grid and calculating the percentage of completed segments. Dimensional accuracy was analyzed by casting a hollow cylinder and measuring the difference between the inner diameter of the resin pattern and the resulting titanium casting. RESULTS: Spinel formation starts at 819 degrees C. Diffraction patterns prove the formation of spinel from MgO and Al2O3. The amount of spinel increases with increasing preheating temperature. The final expansion of the investment at the end of the preheating cycle at 450 degrees C shows a linear correlation to the maximum preheating temperature. The degree of mold filling is reciprocal to the preheating temperature. The dimensional accuracy shows a linear correlation to the amount of spinel. Best dimensional accuracy was obtained at about 900 degrees C. After a preheating temperature of 884 degrees C, as recommended by the manufacturer, the cast specimens showed a slightly lower inner diameter as compared to the resin patterns. SIGNIFICANCE: The results suggest that with the spinel investment analyzed an excellent accuracy of titanium castings may be obtained. Significance. The results suggest that with the spinel investment analyzed an excellent accuracy of titanium castings may be obtained. Mold filling and dimensional accuracy of titanium castings in a spinel-based investment

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Section: Discussionmentioning

confidence: 89%

Mold filling and dimensional accuracy of titanium castings in a spinel-based investment

2010

The Journal of Prosthetic Dentistry

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“…Based on this research, the double-sprue design is more effective than the single main sprue design in decreasing the internal porosity and smoothing surface of the titanium crown casting [7]. A numerical simulation to optimize the runner and the gating system of the titanium dental casting was reported by Wu et al [8]. The cast crown with free of porosity and smooth surface was obtained from the first casting trial by using integrated scanning, rapid prototype pattern and casting procedure.…”

Section: Introductionmentioning

confidence: 95%

Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting

Sutiyoko

Mahardika

Syamsudin³

et al. 2016

Archives of Foundry Engineering

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Design of gating system is an important factor in obtaining defect-free casting. One of the casting defects is a porosity caused by internal shrinkage in solidification process. Prediction of the internal shrinkage porosity in the femoral stem of commercially pure titanium (CP-Ti) is investigated based on the gating system design. The objective of this research is to get the best gating system between three gating system designs. Three gating system designs of the femoral stem were simulated in an investment casting method. The internal shrinkage porosity occurs on the largest part and near the ingate of the femoral stem. The gating system design that has ingates cross section area: 78.5; 157; and 128.5 mm 2 has the least of the internal shrinkage porosity. This design has the most uniform solidification in the entire of the femoral stem. An experiment is conducted to validate the simulation data. The results of internal shrinkage porosity in the three gating system designs in the simulation were compared with the experiment. Based on the comparison, the trend of internal shrinkage porosity at the three gating system designs in the simulation agrees with the experiment. The results of this study will aid in the elimination of casting defect.

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“…However, some polymers could be used instead of wax or other resins for casting or pressing dental restorations and could be printed in conjunction with AM technologies [7][8][9]. One such example was the fabrication of the 3D pattern of the framework for the fabrication of a removable partial denture [10][11][12]. However, to the best of our knowledge, AM technologies has not been used to date for the fabrication of pressed ceramics.…”

Section: A S E R E P O R Tmentioning

confidence: 99%

New fabrication method using additive manufacturing technologies for the pattern of pressed lithium disilicate onlay restorations

Revilla‐León

Olea-Vielba

Esteso-Díaz

et al. 2017

BDS

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149Resumo O fluxo de trabalho digital em odontologia permite o processamento digital completo da restauração começando com a impressão digital usando um scanner intraoral até a fabricação da peça final. Os avanços recentes nas tecnologias de impressão 3D abriram novas possibilidades também para os técnicos em prótese dentária através dos quais os procedimentos de cera e fundição nos laboratórios poderiam ser eliminados. Neste relato de caso clínico, descreve-se uma técnica onde o padrão foi fabricado usando a fabricação de aditivos para restaurações do tipo onlay em dissilicato de lítio injetadas. ABsTRACTThe digital workflow in dentistry allows for complete digital processing of the restoration starting with the digital impression using an intraoral scanner to until the fabrication of final reconstruction. Recent advances in 3D printing technologies opened new possibilities also for dental technicians through which wax-up and casting procedures in the laboratories could be eliminated. In this clinical report, a technique is described where the pattern was fabricated using additive manufacturing for pressed lithium disilicate onlay restorations.

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Application of laser measuring, numerical simulation and rapid prototyping to titanium dental castings

Cited by 56 publications

References 14 publications

Mold filling and dimensional accuracy of titanium castings in a spinel-based investment

Mold filling and dimensional accuracy of titanium castings in a spinel-based investment

Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting

New fabrication method using additive manufacturing technologies for the pattern of pressed lithium disilicate onlay restorations

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