Multilayer Dental Mill Blank with Enamel and Body Layers
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Solution Overview
Problem
Dental prostheses made from existing mill blanks lack aesthetic quality and durability, particularly in replicating the transparency and shade of natural teeth, and the production methods are inconvenient.
Innovation Solution
A multilayer mill blank structure with a body layer and an enamel layer, where the body layer is shaped with specific cross-sectional profiles and an optional intermediate layer, providing varying shades and translucencies to mimic natural teeth, produced through powder pressing and main pressing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin-based mill blank with curved surfaces is used, then the production process is simplified, but the aesthetics and strength are insufficient
Solution Approach 1:
The patent employs a composite material structure consisting of an enamel layer (transparent ceramic or glass) and a body layer (opaque ceramic or glass). This composite structure enables the mill blank to simultaneously achieve natural tooth-like aesthetics through the transparent enamel layer while maintaining structural strength through the opaque body layer, resolving the contradiction between manufacturing simplicity and aesthetic-quality requirements.
2Device complexity
If a single-layer ceramic structure is used, then the production process is simplified, but the ability to reproduce natural tooth appearance is insufficient
Solution Approach 1:
The patent divides the mill blank into distinct functional layers: an enamel layer for transparency and shade reproduction, and a body layer for structural support. This segmentation allows each layer to be optimized for its specific function, with the enamel layer specifically designed to reproduce natural tooth appearance while the body layer provides structural integrity, thereby achieving high manufacturing precision without excessive overall complexity.
Solution Approach 2:
The patent applies different material properties to different regions of the mill blank. The enamel layer is designed with high transparency and specific shade characteristics to match natural teeth, while the body layer is designed with opaque properties for structural support. This local differentiation of material qualities enables precise reproduction of natural tooth appearance in the relevant regions while maintaining overall structural integrity.
3Strength
If metal materials are used, then the strength is high, but the aesthetic quality and biocompatibility are poor
Solution Approach 1:
The patent uses composite ceramic materials that combine the strength properties of traditional metal with the aesthetic and biocompatible properties of ceramic. The enamel layer provides natural tooth-like appearance and biocompatibility, while the body layer ensures structural strength, thereby eliminating the harmful effects of metal such as allergic reactions and poor aesthetics while maintaining high strength.
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 solution achieves a dental prosthesis with enhanced aesthetics and durability, closely matching the appearance and strength of natural teeth, while allowing for convenient production methods.
Implementation Method 1
pre-forming of a body layer (3) by powder pressing
Implementation Method 2
main pressing of the pre-formed body of the body layer (3) with an enamel layer (1) covering the body layer (3)
Data Source
AI summary
The present invention provides a mill blank having a multilayer structure and excellent aesthetics, and a method for producing the mill blank. The present invention relates to a mill blank for dental use comprising a mill blank portion having a multilayer structure with two or more layers, wherein the multilayer structure comprises a body layer (3) inside an enamel layer (1), and the body layer (3) is shaped to comprise a bottom face and a side face, the side face having a portion perpendicular to the bottom face.