Teo Christine Yi Jia, George Roy, Walsh Laurence J
The University of Queensland School of Dentistry, 288 Herston Road, Herston, QLD, 4006, Australia.
School of Dentistry and Oral Health, Gold Coast campus, Griffith University, Nathan, QLD, 4215, Australia.
Lasers Med Sci. 2018 Feb;33(2):251-255. doi: 10.1007/s10103-017-2352-1. Epub 2017 Oct 23.
The aim of this study was to investigate the influence of tip design on patterns of laser energy dispersion through the dentine of tooth roots when using near-infrared diode lasers. Diode laser emissions of 810 or 940 nm were used in combination with optical fiber tips with either conventional plain ends or conical ends, to irradiate tooth roots of oval or round cross-sectional shapes. The lasers were operated in continuous wave mode at 0.5 W for 5 s with the distal end of the fiber tip placed in the apical or coronal third of the root canal at preset positions. Laser light exiting through the roots and apical foramen was imaged, and the extent of lateral spread calculated. There was a significant difference in infrared light exiting the root canal apex between plain and conical fiber tips for both laser wavelengths, with more forward transmission of laser energy through the apex for plain tips. For both laser wavelengths, there were no significant differences in emission patterns when the variable of canal shape was used and all other variables were kept the same (plain vs conical tip, tip position). To ensure optimal treatment effect and to prevent the risks of inadvertent laser effects on the adjacent periapical tissues, it is important to have a good understanding of laser transmission characteristics of the root canal and root dentine. Importantly, it is also essential to understand transmission characteristics of plain and conical fibers tips.
本研究的目的是调查在使用近红外二极管激光时，尖端设计对激光能量通过牙根牙本质的分散模式的影响。810或940 nm的二极管激光与具有传统平端或锥形端的光纤尖端结合使用，以照射椭圆形或圆形横截面形状的牙根。激光以连续波模式在0.5 W下运行5 s，光纤尖端的远端放置在根管根尖或冠方三分之一的预设位置。对从牙根和根尖孔射出的激光进行成像，并计算侧向扩散程度。对于两种激光波长，平端和锥形光纤尖端在根管根尖处射出的红外光存在显著差异，平端尖端的激光能量通过根尖向前传输更多。对于两种激光波长，当使用根管形状变量且所有其他变量保持相同时（平端与锥形尖端、尖端位置），发射模式没有显著差异。为确保最佳治疗效果并防止激光对相邻根尖周组织产生意外影响的风险，深入了解根管和牙根牙本质的激光传输特性非常重要。重要的是，了解平端和锥形光纤尖端的传输特性也至关重要。
