Strobl K, Bahns T L, Willham L, Bishara S E, Stwalley W C
Los Alamos National Laboratory, N.M.
Am J Orthod Dentofacial Orthop. 1992 Feb;101(2):152-8. doi: 10.1016/0889-5406(92)70007-w.
The removal of ceramic brackets from the enamel surface by means of laser heating was investigated with the use of CO2 and YAG lasers. The two bracket types investigated were polycrystalline alumina and monocrystalline alumina. The average torque force necessary to break the adhesive between the polycrystalline ceramic brackets and the tooth was lowered by a factor of 25 when the brackets were illuminated with a CO2 laser beam of 14 watts for 2 seconds. All polycrystalline brackets debonded with the CO2 laser resulted in a complete bracket detachment without bracket failure. The average torque force needed to debond monocrystalline brackets was lowered by a factor of 5.2 when illuminated with a laser setting of 7 watts. Monocrystalline brackets cracked along the bracket slot in 2 of 10 cases. Debracketing without laser heating resulted in a slightly higher incidence of bracket failure (12 of 50). Nevertheless, no visible damage to the enamel surface was observed. Advantages of the laser-aided bracket-removal techniques include the following: The heat produced is localized and controlled; the debracketing tool is essentially "cold"; and the method can be used for removal of various types of ceramic brackets, regardless of their design.
利用二氧化碳激光器和钇铝石榴石激光器，研究了通过激光加热从牙釉质表面去除陶瓷托槽的情况。所研究的两种托槽类型为多晶氧化铝和单晶氧化铝。当用14瓦的二氧化碳激光束照射多晶陶瓷托槽2秒时，打破托槽与牙齿之间粘合剂所需的平均扭矩力降低了25倍。所有用二氧化碳激光脱粘的多晶托槽都实现了托槽完全脱离且托槽未损坏。当用7瓦的激光设置照射时，单晶托槽脱粘所需的平均扭矩力降低了5.2倍。10个案例中有2个单晶托槽沿托槽槽沟出现裂纹。未进行激光加热的去托槽操作导致托槽损坏的发生率略高（50个中有12个）。然而，未观察到牙釉质表面有明显损伤。激光辅助去托槽技术的优点包括：产生的热量局部化且可控；去托槽工具基本“冷”；该方法可用于去除各种类型的陶瓷托槽，无论其设计如何。
