Kreisler Matthias, Al Haj Haitham, Götz Hermann, Duschner Heinz, d'Hoedt Bernd
Department of Oral Surgery, Johannes Gutenberg-University Mainz, Germany.
Lasers Surg Med. 2002;30(3):233-9. doi: 10.1002/lsm.10025.
To investigate and compare temperature elevations at the implant-bone interface during simulated implant surface decontamination with a CO2 and a GaAlAs laser.
STUDY DESIGN/MATERIALS AND METHODS: Stepped cylinder implants (Frialit 2) Friadent GmbH, Mannheim, Germany) with a Titanium plasma sprayed surface were inserted into bone blocks cut from pig femurs. An artificial periimplant bone defect provided access for laser irradiation in the coronal third. Both lasers were operated at 1.0-2.5 W in the cw-mode. The bone block was placed into a 37 degrees C water bath in order to simulate in vivo thermal conductivity and diffusitivity of heat. K-type thermocouples connected to a digital meter were used to register temperature changes at the periimplant bone.
In mean, the critical threshold of 47 degrees C was exceeded after 8 seconds at a power output of 2.5 W, 13 seconds at 2.0 W, 18 seconds at 1.5 W, and 42 seconds at 1.0 W with the GaAlAs laser and 15 seconds (2.5 W), 23 seconds (2.0 W), 35 seconds (1.5 W), and 56 seconds (1.0 W) with the CO2 laser. At equal energy fluence, GaAlAs laser irradiation induced significantly higher temperature elevations than CO2 laser irradiation.
In an energy dependent manner implant surface decontamination with both laser types must be limited in time to allow the implant and bone to cool down. Clinical guidelines are presented to avoid tissue damage.
研究并比较在使用二氧化碳激光和砷化镓铝激光模拟种植体表面去污过程中，种植体 - 骨界面处的温度升高情况。
研究设计/材料与方法：将表面经钛等离子喷涂的阶梯圆柱状种植体（Frialit 2，德国曼海姆Friadent GmbH公司）植入从猪股骨切下的骨块中。在种植体冠方三分之一处制造人工种植体周围骨缺损，以便进行激光照射。两种激光均以连续波模式在1.0 - 2.5 W功率下运行。将骨块置于37℃水浴中，以模拟体内的热导率和热扩散率。使用连接到数字仪表的K型热电偶记录种植体周围骨的温度变化。
平均而言，使用砷化镓铝激光时，在功率输出为2.5 W时8秒后超过47℃的临界阈值，2.0 W时13秒，1.5 W时18秒，1.0 W时42秒；使用二氧化碳激光时，相应时间分别为15秒（2.5 W）、23秒（2.0 W）、35秒（1.5 W）和56秒（1.0 W）。在相同能量通量下，砷化镓铝激光照射引起的温度升高明显高于二氧化碳激光照射。
两种激光进行种植体表面去污时，必须根据能量限制时间，以使种植体和骨能够冷却。提出了临床指南以避免组织损伤。
