Ceramic Dental Drill with Rounded Cutting Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dental drills often remove both diseased and healthy dentin during cavity preparation due to their material and geometry, leading to inefficient and damaging procedures.
Innovation Solution
A dental drill made of ceramic material with specific cutting edge design features, including a radius of 0.03 to 0.12 mm and roughness between 2.5 and 7 μm, optimized for precise removal of diseased dentin while sparing healthy tissue, featuring a rounded or pear-shaped head with multiple cutting edges and strategic angles for improved cutting performance and chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metallic dental drills are used with standard cutting edge geometry, then cutting speed and material removal rate are improved, but healthy dentin is also removed along with diseased dentin
Solution Approach 1:
The cutting edges are designed with specific local geometric properties (rounded base with radius 0.03-0.12 mm, specific roughness 2.5-7 μm) that create different interaction mechanisms with diseased versus healthy dentin. The rounded base geometry concentrates stress at the cutting tip while the specific roughness creates friction differences, enabling selective removal of carious tissue through localized mechanical interaction variations.
Solution Approach 2:
The invention changes the geometric parameters of the cutting edges from conventional sharp angles to rounded bases with specific radius values (0.03-0.12 mm). This parameter change fundamentally alters the cutting mechanism, transforming it from a aggressive removal mode to a more selective scraping mode that responds differently to healthy versus diseased tissue mechanical properties.
2Productivity
If cutting edges are made sharp for effective cutting, then cutting performance is improved, but the service life and reliability of the drill decreases
Solution Approach 1:
The cutting edges feature a rounded base geometry with radius 0.03-0.12 mm instead of sharp angles. This curvature distributes mechanical stresses more evenly across the cutting edge structure, preventing stress concentration that would lead to chipping or fracture. The rounded geometry maintains effective cutting capability while significantly improving the durability and service life of the ceramic drill.
3Reliability
If ceramic material is used for the dental drill, then biocompatibility and resistance to wear are improved, but the drill is more fragile and prone to chipping
Solution Approach 1:
The invention optimizes the geometric parameters of the cutting edges, specifically the base radius (0.03-0.12 mm) and roughness (2.5-7 μm), to compensate for the inherent brittleness of ceramic material. These parameter changes create a geometry that is more tolerant of ceramic's low toughness, reducing stress concentrations that would cause chipping while maintaining the wear resistance and biocompatibility advantages of the ceramic material.
4Manufacturing precision
If the cutting edge base radius is reduced for sharper cutting, then cutting precision is improved, but the strength and load capacity of the cutting edge decreases
Solution Approach 1:
The invention identifies and optimizes the critical parameter of the cutting edge base radius, setting it within the range 0.03-0.12 mm. This optimized parameter range achieves a balance where the cutting edge is sufficiently refined for precise cutting of dentin while maintaining adequate structural strength and load capacity to prevent fracture during clinical use. The specific roughness parameter (2.5-7 μm) is also optimized to enhance cutting performance without compromising strength.
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 ceramic dental drill effectively excises carious material with minimal healthy tooth substance removal, providing tactile feedback and extended service life through enhanced cutting behavior and load capacity.
Implementation Method 1
the dental drill is made of a ceramic material. According to the invention, the dimensioning and configuration is such that the chipping of the cutting edges (cutting edge chipping) is between 2.5 and 7 μm and that the base of the cutting edge has a radius of between 0.03 and 0.12 mm
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The dental drill has a head (1) provided with blades, where the head has a rounded shape, and two of the blades exchange a transition blade (4) at a front side. The blades are designed such that the dental drill cuts with a soft material and does not remove the material with a fixed tooth substance. The drill is manufactured from a ceramic material, and blade chipping amounts between 2.5 and 7 micrometer and wedge angle amounts between 40 degree and 60 degree.