Artificial Crown Laser Engraving for Bonding Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for bonding artificial crowns to teeth, such as sandblasting, can weaken the bonding strength over time due to thermal expansion differences and may cause cracks or fractures in the sintered material, reducing the durability of the crown.
Innovation Solution
The artificial crown features a prosthesis with a retention groove and a plurality of pattern sections formed on the inner surface by laser engraving, which increase the bonding area with adhesive cement, enhancing mechanical bonding strength without deforming the crown shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sandblasting is applied to the inner surface of the crown to enhance bonding strength, then the bonding area with cement is increased, but cracks or fractures occur in the sintered material reducing durability
Solution Approach 1:
The patent replaces the mechanical sandblasting process with a chemical etching process using hydrofluoric acid or phosphoric acid. This chemical method creates micropores on the inner surface of the crown without the physical impact that causes cracks and fractures, thereby maintaining durability while achieving enhanced bonding strength through increased surface area and chemical adhesion.
2Strength
If sandblasting is used to create surface irregularities for bonding, then contact area with cement is increased, but the bonding interface becomes unstable due to thermal expansion differences
Solution Approach 1:
The patent changes the surface modification method from mechanical (sandblasting) to chemical (acid etching), which creates a different surface morphology with micropores rather than irregularities. This parameter change in surface structure, combined with the chemical bonding mechanism, creates a more stable bonding interface that is less sensitive to thermal expansion differences between the crown and cement.
3Ease of manufacture
If physical impact is applied during sandblasting or coating processes, then surface treatment is achieved, but the sintered material is damaged reducing lifespan
Solution Approach 1:
The patent substitutes the mechanical sandblasting and coating processes with a chemical etching process using hydrofluoric acid or phosphoric acid. This chemical method achieves the desired surface treatment效果 without physical impact, preventing damage to the sintered material and preserving the crown's lifespan while still enabling effective bonding.
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 method provides stable mechanical bonding strength between the artificial crown and the tooth, improving treatment stability and reducing the risk of crown detachment, while maintaining the durability and appearance of the crown.
Implementation Method 1
forming a pattern section by applying a laser engraving on the inner surface of the prosthesis
Data Source
Figure 1(a)~1(d)
Figure 2~3
Figure 4~5
AI summary
Disclosed are an artificial crown with a structure capable of providing a mechanical bonding ability during a process of bonding a cement on an inner surface and a method of manufacturing the same. The artificial crown is fitted and bonded on a prepared tooth, comprises a prosthesis with retention groove in which the prepared tooth is inserted; and a plurality of pattern sections formed to a predetermined depth on an inner surface of the prosthesis and allowing an adhesive to be received in order to bond the prosthesis on the prepared tooth.