CO2 Laser Hard Tissue Ablation with Fluidic Cooling
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Solution Overview
Problem
Current dental laser systems fail to effectively remove or shape tooth enamel and dentin without heating the pulp, as they either damage the pulp with high energy pulses or cause detrimental effects with longer pulse times, and existing technologies are not commercially viable due to size and cost constraints.
Innovation Solution
A CO2 laser system operating with a gas pressure of 260 to 600 Torr, producing pulses in the 9.3 to 9.6 μm wavelength range with microsecond pulse widths and high repetition rates, coupled with a hollow waveguide and fluidic flow to control temperature and prevent charring, allowing for efficient removal of hard tissue without substantial temperature increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy density pulses are used to remove hard tissue, then removal efficiency is improved, but pulp damage occurs due to excessive heating
Solution Approach 1:
The patent employs pulsed laser operation with specific pulse widths (10-100 microseconds) and repetition rates (100-1000 Hz) to deliver energy in periodic bursts. This allows the tissue to undergo ablation during each pulse while providing cooling intervals between pulses, preventing cumulative heat buildup that would damage the pulp. The periodic action enables efficient hard tissue removal while maintaining pulp temperature safety.
2Object-affected harmful factors
If lower energy pulses with longer pulse times are used to avoid pulp damage, then pulp safety is improved, but enamel deterioration occurs
Solution Approach 1:
The patent optimizes multiple laser parameters simultaneously: wavelength (9.3-9.6 μm CO2 range for maximum hydroxyapatite absorption), pulse width (10-100 microseconds), and fluence (5-20 J/cm²). These parameter changes create a precise window where sufficient energy is delivered to ablate hard tissue effectively while the pulse duration is short enough to prevent heat conduction to the pulp, thereby protecting both enamel integrity and pulp safety.
3Productivity
If CO2 laser with optimal wavelength 9.3-9.6 μm is used for hard tissue ablation, then ablation efficiency is improved, but device complexity and cost increase due to specialized requirements
Solution Approach 1:
The patent specifies operating the CO2 laser at elevated gas pressure (260-600 Torr) to achieve the optimal 9.3-9.6 μm wavelength range with maximum absorption by hydroxyapatite. This parameter change in gas pressure enables efficient hard tissue ablation while using a conventional CO2 laser platform, avoiding the need for more complex and expensive alternative laser systems.
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 system achieves efficient removal of hard tissue at rates up to 0.5 g/sec with minimal residual heat, preventing pulp damage and offering a commercially viable solution for dental applications.
Implementation Method 1
A CO2 laser system operating with a gas pressure of 260 to 600 Torr, producing pulses in the 9.3 to 9.6 μm wavelength range
Implementation Method 2
allowing for efficient removal of hard tissue without substantial temperature increase
Implementation Method 3
A CO2 laser system operating with a gas pressure of 260 to 600 Torr
Implementation Method 4
coupled with a hollow waveguide and fluidic flow to control temperature and prevent charring
Data Source
AI summary
An improved dental laser system has been developed to cut enamel quickly and precisely, without detrimental residual energy, to provide a replacement for conventional high speed rotary burrs and commercially available dental laser systems.