不同条件的表面喷砂对牙科氧化锆材料表面丧失的影响

摘要

Objects To evaluate the effect of different sandblasting conditions including sandblasting time, sandblasting pressure and sandblasting alumina powder size on surface loss of dental zirconia. Methods 250 zirconia bars were randomly divided into 25 groups according to different sandblasting pressures (0.1 MPa, 0.2 MPa, 0.4 MPa, 0.6 MPa), sandblasting times (7 s, 14 s and 21 s) and alumina powder sizes ( 50 μm and 110 μm) . The control group did not receive sandblasting. The volume loss, height loss and rough⁃ness on zirconia surface after sandblasting were measured and compared for each group. Results The volume loss and height loss in⁃creased with higher sandblasting pressure and longer sandblasting time, but they decreased with larger powder size ( all P<0.05) . The surface roughness increased with higher sandblasting pressure, longer sandblasting time and larger powder size ( all P<0.05) . Conclu⁃sion Considering the clinical adaptation and surface roughness after sandblasting, sandblasting with alumina particles at 0.2 MPa, 21 s and the powder size of 110 μm is recommended for dental application.%目的：探究不同喷砂压强、喷砂时间以及喷砂氧化铝颗粒大小对牙科氧化锆表面丧失量的影响。方法250个氧化锆样本根据不同的喷砂压强（0．1 MPa、0．2 MPa、0．4 MPa、0．6 MPa）、喷砂时间（7 s、14 s、21 s）及喷砂氧化铝颗粒大小（50μm、110μm）随机分成25个组，对照组氧化锆不接受表面喷砂。喷砂后对每一组的体积平均丧失量、高度平均丧失量及粗糙度进行计算并比较。结果随着喷砂时间及喷砂压强的增加，以及喷砂颗粒大小的减小，氧化锆表面丧失量增加（ P均＜0．05）。随着喷砂时间、喷砂压强以及喷砂颗粒尺寸的增加，氧化锆表面粗糙度也增加（ P均＜0．05）。结论考虑到氧化锆表面丧失对适合性的影响以及粗糙度对粘结性能的影响，采用21 s、0．2 MPa及110μm的喷砂条件对氧化锆进行喷砂最为适合。