Vukovich M E, Wood D P, Daley T D
University of Western Ontario, London, Canada.
Am J Orthod Dentofacial Orthop. 1991 Jun;99(6):505-12. doi: 10.1016/S0889-5406(05)81626-9.
When ceramic brackets fracture during treatment or at the time of debonding, it may become necessary to remove residual fragments by grinding with a handpiece. However, the grinding of ceramic surfaces may generate temperatures high enough to have detrimental effects on dental pulp. Intrapulpal temperature measurements were made on extracted teeth during bracket grinding with a small thermocouple probe fixed to the pulpal wall subjacent to the bracket position. These measurements were then compared with established threshold temperatures that have been reported to cause pulpal pathosis. We removed 122 ceramic brackets (A-Company Starfire, GAC Allure, and Unitek Transcend) from eight extracted teeth by grinding with high-speed diamond burs or low-speed green stones, both with and without air or water coolant. It was determined that low-speed grinding without coolant resulted in a significant (p less than 0.001) increase in pulp chamber temperature for all three types of brackets. Neither high-speed nor low-speed grinding during bracket removal caused a rise in pulp chamber temperature when combined with air or water coolant.
当陶瓷托槽在治疗过程中或去粘结时发生断裂，可能需要使用手机进行打磨以去除残留碎片。然而，陶瓷表面的打磨可能会产生足够高的温度，对牙髓产生有害影响。在用固定在托槽位置下方牙髓壁上的小型热电偶探头对拔除的牙齿进行托槽打磨时，进行了牙髓内温度测量。然后将这些测量结果与据报道会导致牙髓病变的既定阈值温度进行比较。我们使用高速金刚石车针或低速绿石，在有或没有空气或水冷的情况下，通过打磨从八颗拔除的牙齿上取下了122个陶瓷托槽（A公司的Starfire、GAC Allure和Unitek Transcend）。结果发现，对于所有三种类型的托槽，无冷却液的低速打磨会导致牙髓腔温度显著升高（p小于0.001）。在去除托槽时，无论是高速还是低速打磨，在结合空气或水冷时都不会导致牙髓腔温度升高。
