30 January 2012 Transmission of 1064 nm laser radiation during ablation with an ultra-short pulse laser (USPL) system
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Proceedings Volume 8208, Lasers in Dentistry XVIII; 82080J (2012) https://doi.org/10.1117/12.910180
Event: SPIE BiOS, 2012, San Francisco, California, United States
During ablation of oral hard tissue with an USPL system a small amount of the incident laser power does not contribute to the ablation process and is being transmitted. Partial transmission of ultra-short laser pulses could potentially affect the dental pulp. The aim of this study was to assess the transmission during ablation and to deduce possible risks for the patient. The study was performed with an Nd:YVO4 laser, emitting pulses with a duration of 8 ps at a wavelength of 1064 nm. A repetition rate of 500 kHz and an average power of 9 W were chosen to achieve high ablation efficiency. A scanner system created square cavities with an edge length of 1 mm. Transmission during ablation of mammoth ivory and dentin slices with a thickness of 2 mm and 5 mm was measured with a power meter, placed directly beyond the samples. Effects on subjacent blood were observed by ablating specimens placed in contact to pork blood. In a separate measurement the temperature increase during ablation was monitored using an infrared camera. The influence of transmission was assessed by tuning down the laser to the corresponding power and then directly irradiating the blood. Transmission during ablation of 2 mm specimens was about 7.7% (ivory) and 9.6% (dentin) of the incident laser power. Ablation of specimens directly in contact to blood caused coagulation at longer irradiation times (t≈18s). Direct irradiation of blood with the transmitted power provoked bubbling and smoke formation. Temperature measurements identified heat generation as the main reason for the observed coagulation.
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Florian Schelle, Florian Schelle, Jörg Meister, Jörg Meister, Bernd Oehme, Bernd Oehme, Matthias Frentzen, Matthias Frentzen, } "Transmission of 1064 nm laser radiation during ablation with an ultra-short pulse laser (USPL) system", Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080J (30 January 2012); doi: 10.1117/12.910180; https://doi.org/10.1117/12.910180

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