Hassan Umair, Farooq Imran, Moheet Imran Alam, AlShwaimi Emad
School of Dental Medicine, State University of New York at Buffalo, Buffalo, New York.
Department of Biomedical Dental Sciences, College of Dentistry, University of Dammam, Kingdom of Saudi Arabia.
Int J Health Sci (Qassim). 2017 Sep-Oct;11(4):23-27.
The aim of the present study was to test cutting efficiency of different materials against conventional alumina in an air abrasion system.
The powder samples were divided into three groups: Group 1 - alumina (control), Group 2 - 45S5 bioactive glass, and Group 3 - hydroxyapatite. 30 microscope glass slides of 0.5 mm thickness were used as an alternative of human enamel and were also divided randomly into these three groups. The time taken by the abrasive particles to cut a hole through the microscope glass slide was recorded with a stop watch. In addition, morphology of the particles was observed through scanning electron microscopy (SEM). A -test was used to compare the times taken to cut a hole through the microscope glass slides, and the level of significance was set at < 0.05.
The mean time taken to cut a hole through the microscope glass slide was 2.96 s and 23.01s for Groups 1 and 2, respectively, whereas powder of Group 3 did not cut after 120 s. The differences between cutting times of Groups 1 and 2 were statistically significant ( < 0.05). The SEM micrographs revealed coarse angular shape for particles of Groups 1 and 2 but Group 3 particles were with round ends and presence of smaller particles was also observed in Groups 2 and 3.
The alumina particles demonstrated excellent cutting efficiency followed by 45S5 particles. The use of bioactive glass particles should be encouraged for cutting purposes whenever a shortage of time for practitioners is not a concern.
本研究的目的是在空气研磨系统中测试不同材料相对于传统氧化铝的切割效率。
将粉末样品分为三组：第1组 - 氧化铝（对照组），第2组 - 45S5生物活性玻璃，第3组 - 羟基磷灰石。使用30片厚度为0.5毫米的显微镜载玻片作为人牙釉质的替代品，并也随机分为这三组。用秒表记录磨料颗粒穿过显微镜载玻片切割出一个洞所需的时间。此外，通过扫描电子显微镜（SEM）观察颗粒的形态。采用A检验比较穿过显微镜载玻片切割出一个洞所需的时间，显著性水平设定为<0.05。
第1组和第2组穿过显微镜载玻片切割出一个洞的平均时间分别为2.96秒和23.01秒，而第3组的粉末在120秒后未切割出洞。第1组和第2组切割时间的差异具有统计学意义（<0.05）。SEM显微照片显示第1组和第2组颗粒为粗糙的角状，但第3组颗粒为圆端，并且在第2组和第3组中也观察到存在较小颗粒。
氧化铝颗粒表现出优异的切割效率，其次是45S5颗粒。只要从业者不担心时间短缺，就应鼓励使用生物活性玻璃颗粒进行切割。
