Screw-Retained Dental Preform With Insert Receiving Region
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Solution Overview
Problem
Conventional ceramic preforms are not suitable for shaping screw-retained dental restorations like crowns due to internal structural features, leading to errors in material holder and block manufacturing tolerances, which complicates the process of creating chairside ceramic screw-retained crown restorations and increases patient wait time.
Innovation Solution
A physical preform specifically designed for screw-retained dental restorations, including a sintered preform with an insert receiving region, and a computer-implemented method for correcting preform placement during milling using probing and alignment parameter determination, allowing for precise milling and alignment of screw-retained dental restorations in a dental office.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional preforms are used for screw-retained dental restorations, then the restoration can be created, but errors in material holder and block manufacturing tolerances occur, reducing manufacturing precision
Solution Approach 1:
The preform is divided into distinct functional regions: a body region for the restoration and an insert receiving region for accommodating the screw-retained components. This segmentation allows each region to be optimized independently, with the insert receiving region specifically designed to receive and precisely position the insert, thereby improving manufacturing precision for screw-retained restorations
Solution Approach 2:
An insert is introduced as an intermediary component that mediates between the preform and the final restoration. The insert receives the screw-retained components and provides precise positioning features, acting as a mediator that eliminates the need for high-precision machining of the preform itself while ensuring accurate placement of the restoration components
2Manufacturing precision
If separate steps of milling and sintering are performed, then the porous ceramic dental design can be created, but the process time increases, worsening patient wait time
Solution Approach 1:
The insert and insert receiving region are prepared in advance during the preform fabrication stage, before the final restoration is milled. This preliminary action allows the screw-retained components to be pre-positioned and secured, eliminating the need for time-consuming separate steps during the chairside procedure and reducing patient wait time
3Ease of manufacture
If conventional preforms are used, then the restoration can be milled, but internal structural features prevent suitable shaping for screw-retained restorations, reducing adaptability
Solution Approach 1:
The preform is segmented into a body region that maintains conventional milling compatibility and an insert receiving region that provides adaptability for screw-retained restorations. This segmentation allows the preform to serve dual purposes: being easily milled using conventional techniques while simultaneously providing the structural features needed for screw-retained components
Solution Approach 2:
The preform design achieves universality by incorporating multiple functions: it serves as the restoration body, contains the insert receiving region for screw-retained components, and maintains compatibility with conventional milling processes. This multi-functionality makes the preform adaptable to both conventional and screw-retained restoration types
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
Enables the efficient generation and milling of screw-retained dental restorations in a dental office, reducing wait time for patients by ensuring accurate alignment and placement, and facilitating the creation of high-strength, precise dental restorations.
Implementation Method 1
After milling, the porous restoration design is sintered to full density to produce a final restoration
Implementation Method 2
probing one or more surface points of a preform mounted to a milling machine using a grinding bur of the milling machine; and determining one or more preform alignment parameters based on a distance traveled by the grinding bur to the one or more surface points
Data Source
AI summary
A physical preform suitable for a screw retained dental restoration (“SRR”) includes a sintered preform and an insert receiving region within at least a portion of the sintered preform. A computer-implemented method of providing a screw retained dental restoration includes receiving a virtual restoration mode and generating one or more virtual spiral toolpaths corresponding to a virtual restoration shape of the virtual restoration model. A computer-implemented method of correcting preform placement during milling includes probing one or more surface points of a preform mounted to a milling machine using a grinding bur of the milling machine and determining one or more preform alignment parameters based on a distance traveled by the grinding bur to the one or more surface points.