Biomimetic Dental Prosthesis Elastic Modulus Mismatch
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Solution Overview
Problem
Existing dental prostheses, such as crowns, do not adequately mimic the characteristics of natural teeth in terms of material properties, particularly the modulus of elasticity, leading to suboptimal performance and durability.
Innovation Solution
A dental prosthesis comprising a plastic primary part with a modulus of elasticity between 5 GPa to 30 GPa and a ceramic secondary part with a higher modulus of elasticity between 40 GPa to 120 GPa, utilizing materials like polymethyl methacrylate and lithium silicate glass ceramic, respectively, to create a biomimetic structure that mimics the properties of natural teeth, with the primary part manufactured using CAD/CAM processes and bonded using ceramic fillers and adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal framework is used as the primary part with high modulus of elasticity, then the strength and rigidity of the prosthesis are improved, but the biomimetic characteristics and durability under cyclic loading deteriorate
Solution Approach 1:
The patent changes the material parameter (modulus of elasticity) of the primary part from metal (high E) to plastic (low E, 5-30 GPa) to match the elastic modulus of natural tooth structures. This parameter change allows the prosthesis to better mimic natural tooth behavior under loading, improving durability while maintaining adequate strength through optimized geometry and material selection.
Solution Approach 2:
The patent employs a composite structure with a plastic primary part and ceramic secondary part, where each material is selected for its specific properties. The plastic primary part provides biomimetic elastic characteristics, while the ceramic secondary part provides aesthetic and wear-resistant properties, creating a composite prosthesis that outperforms single-material solutions.
2Reliability
If the primary part uses material with low modulus of elasticity to mimic natural tooth, then the biomimetic characteristics are improved, but the overall strength and rigidity of the prosthesis worsen
Solution Approach 1:
The patent compensates for the lower modulus of elasticity of the plastic primary part by using a ceramic secondary part with high modulus (40-120 GPa). This composite approach allows the primary part to maintain biomimetic characteristics while the secondary part provides the necessary overall strength and rigidity for functional performance.
Solution Approach 2:
The patent optimizes the geometric shape and curvature of the prosthesis components to distribute stresses effectively. By carefully designing the geometry of the primary and secondary parts, the structure achieves adequate rigidity and strength despite using materials with lower individual moduli of elasticity.
Data Source
AI summary
The invention relates to a dental prosthesis (10) consisting of or comprising an inner primary part (14) that is joined in a fixed manner to an outer secondary part (16). The primary part (14) consists of or includes a plastic material, where the primary part consists of material that has a modulus of elasticity EP and the secondary part (16) consists of material that has a modulus of elasticity Es where EP < ES.