摘要
目的:研究不同激光输入方式下,牙齿组织内部能量的沉积分布特征,搭建激光输入参数与牙齿组织内部温升的定性关系。方法:基于Pennes生物热传导方程,考虑牙齿组织的层状结构以及激光辐照时牙齿外表面与周围环境的热交换,构建Er:YAG激光辐照牙齿组织的热输运模型。借助有限差分法,对不同激光输入方式下牙齿组织内部温升的时-空分布特征进行了数值模拟和对比分析。结果:激光能量输入方式的改变(脉冲功率、脉宽、脉冲个数、脉冲间隔)对于牙齿组织的温升将产生显著的作用效果,并且其作用效果会随着深度的增加而逐渐衰减;输入总能量一定的前提下,输入方式的作用效果仅集中在照射表面附近,对于组织内部牙髓腔壁面的温升几乎不产生影响。此外,牙齿组织外表面与周围环境的热交换一定程度上抑制牙齿组织的温升并加速其冷却进程。结论:激光输入方式对牙齿组织的温升效果存在重要影响,在其与牙齿组织过程前后需考虑外表面与环境的热交换。
Objective:To study the deposition and its distribution of light energy in dental tissue under different laser input modes and establish the qualitative relationship between laser input parameters and the temperature rise distribution in dental tissue.Methods:Based on the Pennes equation of bio-heat transfer,a heat transport model of the dental tissue irradiated by Er:YAG laser was constructed,in which the layered structure and the heat exchange between the outer surface and surrounding environment was considered.By means of the finite difference method,the time-space distribution properties of temperature rise in dental tissue under different laser input modes were numerically simulated and compared.Results:The change of the input modes of laser energy(pulse power,pulse width,pulse number and pulse interval)has a significant effect on the temperature rise of dental tissue,and this effect decreases gradually with the increase of depth.Under the premise that the total input energy is fixed,the effect of the change of input modes is only concentrated near the irradiation surface,but has almost no effect on the temperature rise of the pulp cavity wall.In addition,the heat exchange between the outer surface and surrounding environment will inhibit the temperature rise of the dental tissue to a certain extent and accelerate its cooling process.Conclusions:The laser input method has an important effect on the temperature rise of the dental tissue,and the heat exchange between the external surface and the environment should be considered before and after the process with the dental tissue.
作者
王栋
何昭炜
马俊青
WANG Dong;HE Zhaowei;MA Junqing(Department of Orthodontics,The Affiliated Stomatological Hospital of Nanjing Medical University,Nanjing 210029,China;State Key Laboratory Cultivation Base of Research,Prevention and Treatment for Oral Diseases,Nanjing 210029,China;Jiangsu Province Engineering Research Center of Stomatological Translational Medicine,Nanjing 210029,China;Paiwan Branch,Zhenjiang Stomatological Hospital,Zhenjiang 212002,China;School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)
出处
《口腔生物医学》
2024年第4期217-222,244,共7页
Oral Biomedicine
基金
江苏省科教能力提升工程——江苏省研究型医院(YJX-YYJSDW4),江苏省医学创新中心(CXZX202227)。
