Reinhard E Friedrich1, Maria Quade2, Nate Jowett3,4,5, Peter Kroetz5, Michael Amling6, Felix K Kohlrusch2, Jozef Zustin6,7, Martin Gosau2, Hartmut SchlÜter8, R J Dwayne Miller5,9,10. 1. Oral and Craniomaxillofacial Surgery, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany rfriedrich@uke.de. 2. Oral and Craniomaxillofacial Surgery, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany. 3. Otorhinolaryngology, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany. 4. Otolaryngology - Head and Neck Surgery, Mass Eye & Ear and Harvard Medical School, Boston, MA, U.S.A. 5. Atomically Resolved Dynamics Division, Max Planck Research Department for Structural Dynamics, University of Hamburg, Hamburg, Germany. 6. Institute of Osteology and Biomechanics, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany. 7. Institute of Pathology, Gemeinschaftspraxis Pathologie-Regensburg, Regensburg, Germany. 8. Institute of Clinical Chemistry and Laboratory Medicine, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany. 9. Departments of Chemistry and Physics, University of Toronto, Toronto, Canada. 10. PIRL Laboratory, Eppendorf University Hospital, University of Hamburg, Hamburg, Germany.
Abstract
BACKGROUND/AIM: Picosecond infrared laser (PIRL) was investigated regarding its possible therapeutic application in cutting dental roots. MATERIALS AND METHODS: Extracted human teeth were processed in the root area by laser ablations followed by histological evaluation. Dentin adjacent to the cutting surface was evaluated morphometrically. RESULTS: PIRL produced clearly defined cutting boundaries in dental roots. At the bottom of the cavity, the ablation surface became slightly concave. Heat development in this scantly hydrated tissue was considerable. We attributed the excess heating effects to heat accumulation due to multiple pulse overlap across a limited scan range imposed by tooth geometries. CONCLUSION: Defined areas of the tooth root may be treated using the PIRL. For clinical translation, it would be necessary to improve beam delivery to facilitate beam steering for the intended oral application (e.g. by using a fiber) and identify optimal repetition rates/scan speeds combined with cooling techniques to minimize accumulated heat within ablation cavities. Copyright
BACKGROUND/AIM: Picosecond infrared laser (PIRL) was investigated regarding its possible therapeutic application in cutting dental roots. MATERIALS AND METHODS: Extracted human teeth were processed in the root area by laser ablations followed by histological evaluation. Dentin adjacent to the cutting surface was evaluated morphometrically. RESULTS: PIRL produced clearly defined cutting boundaries in dental roots. At the bottom of the cavity, the ablation surface became slightly concave. Heat development in this scantly hydrated tissue was considerable. We attributed the excess heating effects to heat accumulation due to multiple pulse overlap across a limited scan range imposed by tooth geometries. CONCLUSION: Defined areas of the tooth root may be treated using the PIRL. For clinical translation, it would be necessary to improve beam delivery to facilitate beam steering for the intended oral application (e.g. by using a fiber) and identify optimal repetition rates/scan speeds combined with cooling techniques to minimize accumulated heat within ablation cavities. Copyright
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