Dental Drill Bit Geometry for Mixed-Density Bone Preparation
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Solution Overview
Problem
Existing drill bits for preparing dental implant recesses in bone tissue face challenges due to varying bone densities and structures, requiring multiple tools and complicating the treatment protocol, with alignment issues and potential trauma to the jawbone.
Innovation Solution
A drill bit design featuring a cutting portion with varying radial distances and non-cutting portions to adapt to different bone layers, compressing and cutting bone tissue differently based on density, enhancing osseointegration and reducing trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple tools are used to prepare implant-receiving recesses in different bone layers, then the preparation can adapt to varying bone densities, but the treatment protocol becomes more extensive and alignment becomes difficult
Solution Approach 1:
The patent combines multiple cutting edges with different radial distances on a single drill bit, merging the functions of multiple separate tools into one instrument. This allows the drill bit to simultaneously address both cortical and cancellous bone preparation while maintaining alignment, as all cutting edges are integrated on the same tool body rotating around a common axis.
Solution Approach 2:
The drill bit is designed with multi-functionality by incorporating cutting edges at different radial distances from the axis of rotation. This universal design enables a single tool to perform multiple functions: outer cutting edges for cortical bone removal and inner cutting edges for cancellous bone preparation, eliminating the need for separate specialized tools.
2Adaptability or versatility
If multiple interdependent tools are employed to create a recess, then different bone layers can be addressed, but the treatment protocol becomes more extensive
Solution Approach 1:
By merging multiple cutting functions into a single drill bit, the patent eliminates the sequential steps required when using multiple separate tools. The combined design allows simultaneous preparation of both cortical and cancellous bone layers in one continuous operation, significantly reducing treatment time and procedural complexity.
Solution Approach 2:
The drill bit maintains continuous useful action by preparing both bone layers in a single uninterrupted drilling operation. The cutting edges operate simultaneously throughout the drilling process, eliminating the stop-start nature of sequential tool changes and maintaining continuous bone preparation throughout the treatment.
3Productivity
If conventional drill bits cut through both cortical and cancellous bone, then the recess can be formed, but trauma to the jawbone increases
Solution Approach 1:
The patent applies local quality by assigning different cutting characteristics to different parts of the drill bit. Outer cutting edges with larger radial distances are optimized for removing hard cortical bone, while inner cutting edges with smaller radial distances are optimized for preparing softer cancellous bone. This localized differentiation reduces trauma by applying appropriate cutting forces tailored to each bone type.
Solution Approach 2:
The drill bit utilizes parameter changes by varying the radial distance of cutting edges from the axis of rotation. This geometric parameter variation allows the outer edges to engage cortical bone at a greater radius while inner edges engage cancellous bone at a smaller radius, optimizing cutting efficiency for each bone type and minimizing traumatic effects.
Data Source
Figure 1(a)~1(e)
Figure 2~3
AI summary
A drill bit (10) comprises an apical end (1), a coronal end (2), a longitudinal axis (L) extending between the apical end and the coronal end, a drill bit core (11), and a cutting portion (C) extending at least partially along the drill bit core. Along the cutting portion an outline of a cross-section of the drill bit core perpendicular to the longitudinal axis comprises at least one outermost point (12) at a first radial distance (r1) from the longitudinal axis and at least one cutting point (14) at a second radial distance (r2) from the longitudinal axis. Along a first part of the cutting portion, the second radial distance is smaller than the first radial distance, and along a second part of the cutting portion, the second radial distance is substantially equal to the first radial distance.