Twisting Instrument Ball Head for Dental Implant Torque Control
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Solution Overview
Problem
Existing Tordier instruments for screw-in components in dental implantology lack reliable interaction between the working part and the tool removal mechanism, particularly in scenarios where the center lines of the instrument and the screw-in part form a flexible angle.
Innovation Solution
The Tordier instrument features a six-tooth-based ball head with a spherical envelope that interacts with both the free end and toothed heads of the labor part, combined with a neck that includes a target break area and a torsional rod design for torque monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the working part is designed as a ball head with spherical envelope surface contacted by free end and tooth heads, then the mechanical interaction and torque transmission are improved, but the device complexity increases
Solution Approach 1:
The working part is designed as a ball head with a spherical envelope surface that is contacted at least by the free end and portions of the tooth heads. This spherical geometry enables flexible angular interaction between the twisting instrument and the screw-in component while maintaining reliable mechanical engagement and torque transmission through the curved surface contact.
2Reliability
If the neck is designed with predetermined breaking zone and torsional elasticity, then the torque monitoring capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The neck is designed with a predetermined breaking zone and torsional elasticity by changing geometric parameters such as diameter reduction, wall thickness variation, and material selection. These parameter changes enable the neck to exhibit controlled torsional deformation and predictable breaking behavior for torque monitoring, while the manufacturing precision is managed through standardized design features.
3Adaptability or versatility
If the center lines of the twisting instrument and screw-in component enclose a bending angle, then the adaptability to different assembly scenarios is improved, but the stress concentration increases
Solution Approach 1:
The spherical envelope surface of the ball head working part allows the center lines of the twisting instrument and screw-in component to enclose bending angles while maintaining contact through the curved surface. This curvature distributes the applied forces more evenly compared to rigid angular joints, reducing stress concentration at specific points.
Solution Approach 2:
The predetermined breaking zone in the neck is designed to absorb and distribute stresses before they reach critical levels. This breaking zone acts as a stress-relief feature that prevents catastrophic failure by providing a controlled weak point that yields under excessive load, thereby cushioning the overall structure from stress concentration.
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
This design enables reliable screwing and unscrewing of prosthetic denture components with a flexible angle interface, ensuring secure mechanical interaction and efficient torque transmission during the screwing process.
Implementation Method 1
The neck consists of a neck transition zone (21), a neck main cylinder zone (31), a neck cone zone (35) and a neck secondary cylinder zone (36)... the neck is designed to be slim and elastic in terms of its geometric shape... the user perceives a torsion of more than 10 degrees via the actuating element, which twists the neck elastically
Implementation Method 2
The neck or drive shaft has a predetermined breaking zone... If the torque specified for the screw connection is exceeded, the neck separates from the drive shaft at the predetermined breaking point
Data Source
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AI summary
The invention relates to a twisting instrument for a screw-in component having a tool recess which comprises a drive shaft, a neck and a working part. The working part has - as a spherical head having a plurality of teeth - a spherical enveloping surface which is contacted at least both by the free end and by sections of the tooth heads of the teeth of the working part. The neck or the drive shaft has a predetermined breaking zone. According to the present invention, a twisting instrument is developed wherein the working part thereof engages in the tool recess of the screw-in part in an overload-proof and reliable manner.