Gross M, Laufer B Z, Ormianar Z
Department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
Int J Oral Maxillofac Implants. 1995 Mar-Apr;10(2):207-12.
Excessive heat generation at the implant-bone interface may cause irreversible bone damage and loss of osseointegration. The effect of heat generation in vitro at the implant surface caused by abutment reduction with medium- and extra-fine-grain diamond and tungsten burs in a high-speed dental turbine was examined. Titanium-alloy abutments connected to a titanium-alloy cylindrical implant embedded in an acrylic-resin mandible in a 37 degrees C water bath were reduced horizontally and vertically. Temperature changes were recorded via embedded thermocouples at the cervix and apex of the implant surface. Analysis of variance for repeated measures was used to compare seven treatment groups. Thirty seconds of continuous cutting with standard turbine coolant caused a mean temperature increase of 1 degrees C with a maximum of 2 degrees C. Similar tungsten cutting caused a mean increase of 2 degrees C with a maximum of 4.7 degrees C, significantly higher than diamond reduction. Additional air-water spray for continuous tungsten cutting had no significant effect, while intermittent cutting for 15-second increments reduced the temperature increase by 75%. Thus, abutment reduction with medium-grit diamonds using intermittent pressure and normal turbine coolant is unlikely to cause an interface-temperature increase sufficient to cause irreversible bone damage and compromise osseointegration.
种植体-骨界面处产生过多热量可能会导致不可逆的骨损伤和骨结合丧失。研究了在高速牙科涡轮机中使用中粒度和超细粒度金刚石及钨钢车针进行基台研磨时，种植体表面在体外产生热量的影响。将连接到嵌入37摄氏度水浴中丙烯酸树脂下颌骨的钛合金圆柱形种植体的钛合金基台进行水平和垂直研磨。通过植入在种植体表面颈部和根尖处的热电偶记录温度变化。采用重复测量方差分析来比较七个治疗组。使用标准涡轮冷却剂连续切割30秒导致平均温度升高1摄氏度，最高为2摄氏度。类似的钨钢切割导致平均升高2摄氏度，最高为4.7摄氏度，显著高于金刚石研磨。连续钨钢切割时额外的气水喷雾没有显著效果，而以15秒增量进行间歇切割可使温度升高降低75%。因此，使用间歇压力和普通涡轮冷却剂，用中粒度金刚石进行基台研磨不太可能导致界面温度升高到足以引起不可逆骨损伤并损害骨结合的程度。
