Dental Drill Bit Geometry for Cortical and Cancellous Bone

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Solution Overview

Problem

In dentistry, preparing a recess for a dental implant is challenging due to varying bone densities and orientations, requiring multiple tools and posing difficulties in alignment, especially when transitioning between cortical and cancellous bone layers.

Innovation Solution

A drill bit with a unique cutting portion design that adapts to different bone densities by compressing and cutting bone tissue differently along its length, featuring a combination of compression and relaxation zones and varying radial distances to optimize cutting performance and bone density, allowing for efficient preparation of a recess that enhances osseointegration and reduces trauma.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple tools are used to prepare the bone recess, then the preparation can accommodate different bone densities, but the treatment protocol becomes more extensive and alignment becomes difficult

Engineering Contradiction:

Improveadaptability to different bone densitiesVSAvoidnumber of tools required

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple drilling functions into a single drill bit by integrating different cutting portion designs along its length. The drill bit includes a first cutting portion with a first radial distance for cortical bone and a second cutting portion with a second radial distance for cancellous bone, merging what would traditionally require separate tools into one unified instrument.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The drill bit is designed to perform multiple functions simultaneously - it can cut both cortical bone and cancellous bone, and can compress bone tissue, all within a single tool. This multi-functionality eliminates the need for multiple specialized tools while maintaining adaptability to different bone types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If a drill bit cuts through both cortical and cancellous bone, then the recess can be prepared efficiently, but bone trauma and resorption may increase

Engineering Contradiction:

Improvedrilling efficiencyVSAvoidbone trauma and resorption

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The drill bit features locally differentiated cutting portions with different radial distances optimized for specific bone types. The first cutting portion with a larger radial distance is designed for cortical bone removal, while the second cutting portion with a smaller radial distance is designed for cancellous bone, allowing each region to interact with the appropriate bone type to minimize trauma.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The drill bit incorporates a compression portion that can dynamically compress bone tissue during drilling. This compression capability allows the tool to adapt its mechanical interaction with the bone, reducing trauma and promoting healing while maintaining drilling efficiency.

Inventive Principle:

Principle #15Dynamics

3Productivity

If the drill bit has a larger radial distance for cortical bone removal, then cutting efficiency improves, but bone compression and potential damage to underlying cancellous bone increases

Engineering Contradiction:

Improvecortical bone cutting efficiencyVSAvoidcancellous bone integrity

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The cutting portion is segmented into distinct regions with different radial distances. The first cutting portion has a larger radial distance optimized for efficient cortical bone removal, while the second cutting portion has a smaller radial distance that transitions to the cancellous bone region, preventing excessive compression and damage to the underlying cancellous bone structure.

Inventive Principle:

Principle #1Segmentation

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 drill bit effectively prepares a recess that provides primary stability and promotes faster bone ingrowth by adapting to different bone densities, reducing the need for multiple tools and simplifying the drilling process while minimizing bone resorption.

Implementation Method 1

bone tissue that is located radially outwards in relation to the cutting point is compressed radially outwards until the next outermost point is reached

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

the outline of the cross-section is configured to allow the radially compressed bone tissue to relax

Methodology Applied

Scientific EffectElastic recovery: Elastic Recovery

Data Source

PatentUS20250018479A1Drill bit

Publication Date: 2025.01.16 NOBEL BIOCARE SERVICES AG

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.