Dental Furnace Support Elements for Uniform Firing
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Solution Overview
Problem
Dental furnaces face challenges in maintaining precise temperature profiles and durability, especially when handling multiple dental restoration parts with non-planar surfaces, which can lead to temperature gradients and breakage of the receiving section during the firing process.
Innovation Solution
The use of a matrix arrangement of thin support elements with good thermal conductivity, arranged to form a support plane that covers the firing chamber base, ensuring uniform temperature distribution and protection against cracking, even when the hood is opened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a solid base with good thermal conductivity is used for the receiving section, then temperature uniformity is improved, but the base becomes more susceptible to breakage due to thermal stress and mechanical loads
Solution Approach 1:
The solid base is divided into multiple individual support elements (3-5 mm thick) arranged in a matrix pattern. This segmentation allows the base to flex independently at each support point, reducing thermal stress concentration and preventing catastrophic failure while maintaining good thermal conductivity through the supportive contact between elements and the firing chamber base.
Solution Approach 2:
The support elements are strategically arranged to provide localized thermal conduction paths from the firing chamber base to the receiving section. Each support element acts as a localized heat transfer point, ensuring temperature uniformity across the firing chamber while the gaps between elements reduce overall thermal stress on any single point.
2Productivity
If the hood is opened to accelerate cooling and shorten the firing cycle, then productivity is improved, but temperature gradients are generated that may cause breakage of the receiving section
Solution Approach 1:
The segmented support elements allow the receiving section to flex and accommodate rapid temperature changes when the hood is opened. The gaps between support elements enable thermal expansion and contraction without generating excessive stress, allowing fast cooling cycles without breakage.
3Loss of time
If thin support elements are used to reduce thermal mass and improve cooling, then the firing cycle is shortened, but the support elements may lack sufficient mechanical strength
Solution Approach 1:
The thin support elements (3-5 mm) compensate for individual element strength limitations through the collective strength of multiple elements arranged in a matrix. The distributed support across many elements provides sufficient mechanical strength while the thin design minimizes thermal mass for faster cooling.
Solution Approach 2:
Multiple thin support elements work together as a unified support system. The combined mechanical strength of all support elements provides adequate support for the receiving section and dental restoration parts, while the thin design of individual elements enables rapid cooling.
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
This solution maintains precise temperature profiles and enhances the durability of the dental furnace by preventing breakage and reducing unwanted vibrations, while allowing for efficient handling of multiple restoration parts with non-planar surfaces.
Implementation Method 1
the support elements have a good thermal conductivity... The support elements obviously well conduct the heat by means of the abutment against each other
Implementation Method 2
the firing chamber base permits a homogenization or equalization of the temperature profile
Data Source
AI summary
In a dental furnace having a firing chamber (12) with a base and at least one receiving portion for dental restoration parts (40). The receiving portion has a plurality of support elements (26) that are arranged adjacent to one another and in particular have the same thickness, wherein said support elements (26) support the dental restoration part (40) during the firing process.