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Sensor-based laser ablation for tissue specific cutting: an experimental study.

Stephan Rupprecht¹, Katja Tangermann-Gerk, Joerg Wiltfang

¹Department of oral and Maxillofacial Surgery, University Erlangen-Nuremberg, Glueck str. 11, 91054 Erlangen, Germany. stephan.rupprecht@mkg.imed.uni-erlangen.de

Lasers in Medical Science

|August 17, 2004

Summary

A novel feedback system using Er:YAG laser-tissue interaction successfully controlled bone drilling in pig jaws. This system precisely ablated cortical bone without damaging nerves, demonstrating its effectiveness for precise osteotomy.

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Area of Science:

Biomedical Engineering
Laser Dentistry
Oral Surgery

Background:

Laser-tissue interactions generate measurable signals.
These signals can be quantified for feedback control in laser procedures.
Precise control is crucial for osteotomy and minimizing collateral damage.

Purpose of the Study:

To evaluate a feedback system for controlling Er:YAG laser drilling in bone.
To assess the system's ability to achieve precise cortical bone ablation.
To determine if the system prevents damage to critical structures like the alveolar nerve.

Main Methods:

Ten minipig jaw halves underwent laser osteotomy using an Er:YAG laser with a feedback system.
Sensor outputs during laser-tissue interaction were recorded and analyzed.

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Ablation depth was quantified using 3D computed tomography and histological evaluation.

Main Results:

Detected signals significantly changed character upon penetrating the cortical bone layer.
Radiological evaluation of 98 holes showed precise ablation within the cortical layer (97.8% mean depth).
Histological analysis confirmed no physical damage to the alveolar nerve bundle.

Conclusions:

The developed feedback system effectively controls Er:YAG laser drilling for precise cortical bone ablation.
The system leverages quantified laser-tissue interaction signals for accurate depth control.
This technology shows promise for safe and effective laser-assisted osteotomy in oral surgery.