Beijing Forestry University, Beijing, China.
Center of Digital Dentistry/Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China.
Photobiomodul Photomed Laser Surg. 2024 Aug;42(8):541-549. doi: 10.1089/photob.2023.0147.
This study aims to enhance the precision of implant cavity preparation, addressing a notable challenge in the current state of the field by utilizing femtosecond lasers. The application of femtosecond lasers in implant cavity preparation heralds a noninvasive and efficient technique, characterized by diminished thermal damage and high biocompatibility. Despite these promising attributes, the realization of precise cavity preparation remains a significant challenge in the contemporary domain. Our research group devised a specialized femtosecond laser microsurgery robotic system tailored for sophisticated implant cavity preparation. This system facilitated the meticulous analysis of sheep shank bone samples, enabling precise three-dimensional cutting. The analysis included an extensive examination of ablation effects, using a laser scanning microscope and VK Analyzer software. This investigation spanned the phases of laser flux calibration and experimental validation, offering a critical evaluation of the automated preparation process. The study delineated that at the focus position of our custom-made oral clinical femtosecond laser microsurgery robotic system, the laser spot diameter is 75.69 μm, and ascertained the ablation threshold for sheep shank cortical bone to be 1.47 J/cm. Utilizing low laser flux with minimal ablation craters overlap compromised the sidewall precision of the implant cavity, whereas employing high laser flux with extensive ablation craters overlap resulted in an enlarged ablation angle. At a laser energy setting of 2.2362 J/cm and a 50% ablation crater overlap, an implant cavity was successfully crafted featuring a top diameter of 4.41 mm, a bottom diameter of 3.98 mm, and a depth of 3 mm, devoid of any adverse thermal effects such as cracking or carbonization. The oral clinical femtosecond laser microsurgery robotic system can achieve automated and precise implant cavity preparation. This advancement promotes the broader application of femtosecond lasers in the field of orthopedics.
本研究旨在提高种植体腔预备的精度，利用飞秒激光解决当前领域的一个显著挑战。飞秒激光在种植体腔预备中的应用预示着一种非侵入性和高效的技术，其特点是热损伤小和生物相容性高。尽管具有这些有希望的特性，但在当代领域，实现精确的腔预备仍然是一个重大挑战。我们的研究小组设计了一种专门的飞秒激光微创手术机器人系统，用于复杂的种植体腔预备。该系统便于对羊胫骨骨样本进行细致的分析，实现了精确的三维切割。分析包括使用激光扫描显微镜和 VK Analyzer 软件对烧蚀效果进行广泛检查。这项研究涵盖了激光通量校准和实验验证阶段，对自动化制备过程进行了关键评估。研究表明，在我们定制的口腔临床飞秒激光微创手术机器人系统的焦点位置，激光光斑直径为 75.69 μm，并确定了羊胫骨皮质骨的烧蚀阈值为 1.47 J/cm。利用低激光通量和最小的烧蚀坑重叠会影响种植体腔的侧壁精度，而采用高激光通量和广泛的烧蚀坑重叠会导致烧蚀角度增大。在激光能量设置为 2.2362 J/cm 和 50%烧蚀坑重叠的情况下，成功制备了一个种植体腔，其顶部直径为 4.41 mm，底部直径为 3.98 mm，深度为 3 mm，没有任何不利的热效应，如开裂或碳化。口腔临床飞秒激光微创手术机器人系统可以实现自动化和精确的种植体腔预备。这一进展促进了飞秒激光在骨科领域的更广泛应用。
