Xue Vicky Wenqing, Zhao Irene Shuping, Yin Iris Xiaoxue, Niu John Yun, Lo Edward Chin Man, Chu Chun Hung
School of Dentistry, Shenzhen University Health Science Center, Shenzhen, People's Republic of China.
Faculty of Dentistry, The University of Hong Kong, Hong Kong.
Clin Cosmet Investig Dent. 2021 Apr 30;13:155-161. doi: 10.2147/CCIDE.S304273. eCollection 2021.
A carbon dioxide laser at 9,300 nm has a high absorption affinity for water and a shallow depth of penetration. It can be used for soft tissue surgery and hemostasis. Besides, it matches well with the absorption characteristic of hydroxyapatite in enamel and dentine. Therefore, the laser possesses a great ability for energy transfer to dental hard tissues. It has a low risk of thermo-damage to the dentine-pulp complex because it has a shallow depth of heat absorption. Hence, the laser is safe for dental hard tissue preparation. A carbon dioxide laser at 9,300 nm can effectively alter the chemical structure of teeth. It increases the ratio of calcium to phosphorus and converts the carbonated hydroxyapatite to the purer hydroxyapatite of enamel and dentine. It can alter the surface morphology of a tooth through surface melting, fusion, and ablation of dentine and enamel. At higher power, it removes caries lesions. It can enhance the success of restoration by increasing the bond strength of dental adhesives to the dentine and enamel. A carbon dioxide laser at 9,300 nm can also be used with fluoride for caries prevention. The advancement of technology allows the laser to be delivered in very short pulse durations and high repetition rates (frequency). Consequently, the laser can now be used with high peak power. The objective of this review is to discuss the effects and potential use of a 9,300 nm carbon dioxide laser on dental hard tissue.
波长9300纳米的二氧化碳激光对水具有高吸收亲和力且穿透深度浅。它可用于软组织手术和止血。此外，它与牙釉质和牙本质中羟基磷灰石的吸收特性匹配良好。因此，该激光具有将能量传递至牙齿硬组织的强大能力。由于其热吸收深度浅，对牙髓复合体造成热损伤的风险较低。因此，该激光用于牙齿硬组织制备是安全的。波长9300纳米的二氧化碳激光可有效改变牙齿的化学结构。它提高钙磷比，将碳酸化羟基磷灰石转化为牙釉质和牙本质中更纯净的羟基磷灰石。它可通过牙本质和牙釉质的表面熔化、融合和消融改变牙齿的表面形态。在较高功率下，它可去除龋损。它可通过提高牙科粘合剂与牙本质和牙釉质的粘结强度来提高修复成功率。波长9300纳米的二氧化碳激光还可与氟化物一起用于预防龋齿。技术的进步使该激光能够以非常短的脉冲持续时间和高重复率（频率）发射。因此，该激光现在可用于高峰值功率。本综述的目的是讨论波长9300纳米的二氧化碳激光对牙齿硬组织的影响和潜在用途。
