Dental Abutment Embedded Part with Projecting Lines
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Solution Overview
Problem
Ceramic dental prostheses for dental implants produced using CAD/CAM systems face challenges in maintaining dimensional accuracy and strength due to sintering shrinkage, and achieving uniform adhesive bonding between the abutment and the block, leading to potential breakage and inadequate fixation.
Innovation Solution
A dental abutment design featuring a gingiva contact part with a forward-thicker truncated conical shape, a fitting part that projects towards the jawbone, and an embedded part with multiple projecting line parts on its surface, which ensures accurate positioning and fixation within an embedding hole, forming a uniform gap for adhesive application, thereby enhancing bonding strength and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If ceramics block is used as material for dental prosthesis, then beauty appearance is improved, but dimensional accuracy after sintering deteriorates
Solution Approach 1:
The dental prosthesis is divided into multiple parts: a separate part containing the fitting part for the implant fixture, and a block for the dental prosthesis. The separate part is produced independently with high precision, then embedded into the block. This segmentation allows the fitting part to be manufactured with accurate dimensions before sintering, avoiding the dimensional accuracy problems caused by ceramic sintering shrinkage.
2Strength
If separate part is embedded into block, then strength of fitting part is improved, but ease of manufacture deteriorates
Solution Approach 1:
The separate part containing the fitting part is produced in advance as a pre-assembled unit. The embedding part of the separate part is embedded into the embedding hole of the block in a single operation. This preliminary preparation simplifies the manufacturing process by avoiding the need to separately produce and assemble multiple small components, thereby improving ease of manufacture while maintaining the strength benefits.
3Strength
If uniform gap for adhesive is formed, then bonding strength is improved, but measurement precision deteriorates
Solution Approach 1:
The outer peripheral surface of the embedded part is provided with multiple projecting line parts at specific positions. These projecting line parts create localized features that serve as reference points for adhesive application. The spaces between these projecting line parts form uniform gaps that are easier to control and measure, ensuring consistent adhesive distribution and bonding strength while simplifying the measurement and control process.
Data Source
AI summary
To provide a dental abutment having an embedded part embedded into an embedding hole of a block and fixed in the embedding hole. An uniform gap for a dental adhesive can be formed along an approximately entire circumference between an outer peripheral surface of the embedded part and an inner surface of the embedding hole. The dental abutment includes a gingiva contact part 1 having a forward-thicker truncated conical shape on the intraoral side; a fitting part 2 projecting toward the jawbone side from the jawbone-side contact surface 1a of the gingiva contact part 1, and fitted into an end part on the intraoral side of the implant fixture so as not to rotate; and an embedded part 3 to be embedded. Three or more projecting line parts 5 are formed on an outer peripheral surface 3a of the embedded part 3 so as to form the uniform gap.