Dental Casting Embedding Material Rapid Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing embedding materials for dental casting, particularly those using gypsum-based and phosphate-based compositions, face challenges in withstanding rapid heating processes without cracking or breakage, especially when using resin patterns, which require higher heating temperatures and different thermal expansion behaviors compared to traditional wax patterns.
Innovation Solution
A novel embedding material composition comprising a binder, such as calcined gypsum or a mixture of magnesium oxide and ammonium primary phosphate, combined with non-heat-expandable refractory materials like fused silica, mullite, zircon, or alumina, with specific particle diameters and mass ratios to prevent cracking and ensure smooth, glossy surfaces during rapid heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat-expandable refractory materials are used in embedding material composition, then thermal expansion matching with metal casting is improved, but cracking and breakage occur during rapid heating
Solution Approach 1:
The patent changes the thermal expansion parameter of the embedding material by replacing heat-expandable refractory materials with non-heat-expandable refractory materials having specific particle diameters (5-20 μm). This parameter change allows the embedding material to maintain dimensional stability during rapid heating while still achieving appropriate thermal expansion matching with the metal casting through controlled composition rather than relying on high expansion materials
Solution Approach 2:
The patent creates a composite embedding material composition combining non-heat-expandable refractory materials with specific binders and additives. This composite structure achieves both crack resistance during rapid heating and appropriate thermal expansion characteristics by synergistic combination of materials rather than relying on a single heat-expandable component
2Manufacturing precision
If gypsum-based embedding materials are used for low melting point metals, then casting properties are improved, but the materials cannot withstand rapid heating processes
Solution Approach 1:
The patent changes the thermal stability parameter by replacing traditional gypsum-based materials with phosphate-based embedding materials containing magnesium oxide and ammonium primary phosphate. This material substitution raises the decomposition temperature and heat resistance while maintaining casting quality for low melting point metals, enabling the material to withstand rapid heating processes
3Temperature
If phosphate-based embedding materials are used for high temperature casting, then heat resistance is improved, but the materials cause cracking during rapid heating
Solution Approach 1:
The patent applies local quality by controlling the particle diameter distribution of refractory materials in different regions of the embedding material composition. By using non-heat-expandable refractory materials with specific particle sizes (5-20 μm) and optimizing their distribution, the material achieves localized stress distribution that prevents crack propagation while maintaining overall heat resistance
Solution Approach 2:
The patent changes the chemical composition parameters by optimizing the ratio of magnesium oxide to ammonium primary phosphate and controlling the content of non-heat-expandable refractory materials. This parameter optimization creates a composition that resists thermal shock and cracking during rapid heating while maintaining the high heat resistance required for phosphate-based materials
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively suppresses cracking and breakage, achieving desired size accuracy and surface quality in dental casting, even with complex shapes, by eliminating the need for heat-expandable refractory materials and optimizing thermal expansion matching.
Implementation Method 1
the embedding material has a low coefficient of thermal expansion, and thus cracking and breakage are effectively suppressed
Implementation Method 2
comprising a binder and a non-heat-expandable refractory material as main components
Data Source
AI summary
The object of the present invention is to provide an embedding material composition for casting that makes it possible to conduct a favorable casting in the case where casting is conducted using a resin pattern that is different from a conventional wax pattern in disappearance temperature and disappearance behaviors through “rapid heating” excellent in treatment efficiency. The present invention relates to an embedding material composition for casting not using a heat-expandable refractory material as a main component, comprising: a binder; and a non-heat-expandable refractory material having an average particle diameter of 5 to 20 μm as main components, in which a content of the binder is 25 to 40 parts by mass and a content of the non-heat-expandable refractory material is 60 to 75 parts by mass in the case where the total amount of the main components is 100 parts by mass, and the present invention also relates to a casting process using the embedding material composition for casting.