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.

中文翻译：

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皮秒红外激光 (PIRL) 对人类牙根的烧蚀精度和热效应：体外试验研究

背景/目的：研究了皮秒红外激光 (PIRL) 在切割牙根方面可能的治疗应用。材料和方法：通过激光消融在牙根区域处理提取的人类牙齿，然后进行组织学评估。邻近切割面的牙本质通过形态测量进行评估。结果：PIRL 在牙根中产生了清晰的切割边界。在腔的底部，烧蚀表面变得略微凹入。这种水合不足的组织中的热量发展相当可观。我们将过度加热效应归因于由于牙齿几何形状施加的有限扫描范围内的多个脉冲重叠而导致的热量积累。结论：可以使用 PIRL 治疗牙根的特定区域。对于临床翻译，