Lithium Disilicate Dental Blank Pre-sintering
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Solution Overview
Problem
Existing pre-sintered blanks for dental restorations are susceptible to variations in sintering temperature, leading to inconsistent shrinkage and dimensional inaccuracies in dental restorations due to inhomogeneous temperature distributions in the sintering furnace.
Innovation Solution
A pre-sintered blank based on lithium disilicate glass ceramic with a relative density of 60-90% is developed, allowing for precise determination of the enlargement factor and machining without the need for liquids, and can be processed at various pre-sintering temperatures without significant shrinkage changes during subsequent dense sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-sintered blanks are used for dental restorations, then machining and dense sintering can be performed, but dimensional accuracy deteriorates due to shrinkage variations from temperature fluctuations
Solution Approach 1:
The patent applies parameter changes by controlling the pre-sintering temperature within a specific range (500-900°C) where the material exhibits minimal shrinkage. This temperature parameter control ensures that the blank maintains dimensional stability during subsequent machining and dense sintering, resolving the contradiction between manufacturability and precision.
Solution Approach 2:
The patent implements preliminary action by performing pre-sintering before machining and dense sintering. This preliminary heat treatment stabilizes the blank's dimensions and reduces sensitivity to subsequent temperature variations, enabling precise machining while maintaining final dimensional accuracy.
2Strength
If pre-sintering temperature is varied to optimize material properties, then material strength improves, but shrinkage consistency deteriorates
Solution Approach 1:
The patent identifies a specific pre-sintering temperature range (500-900°C) where the lithium disilicate glass ceramic exhibits optimal properties: sufficient strength development while maintaining minimal and consistent shrinkage. This parameter optimization resolves the contradiction between strengthening the material and maintaining dimensional stability.
3Strength
If dense sintering is performed at high temperature, then restoration strength increases, but dimensional variations increase due to temperature distribution inhomogeneity
Solution Approach 1:
The patent performs preliminary pre-sintering at controlled temperatures (500-900°C) before the final dense sintering. This preliminary action stabilizes the blank's dimensions and reduces its sensitivity to temperature distribution inhomogeneities during the subsequent high-temperature dense sintering, enabling high strength while maintaining dimensional precision.
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 lithium disilicate glass ceramic blanks provide high-strength, optically attractive dental restorations with precise dimensional accuracy, being less susceptible to temperature fluctuations and allowing for easy machining and dense sintering to achieve desired geometries.
Implementation Method 1
processed by dense sintering to form high-strength and optically very attractive dental restorations
Data Source
AI summary
Pre-sintered blanks based on lithium disilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.