Oen J O, Gjerdet N R, Wisth P J
Department of Orthodontics and Facial Orthopedics, School of Dentistry, University of Bergen, Norway.
Eur J Orthod. 1991 Jun;13(3):187-91. doi: 10.1093/ejo/13.3.187.
The forces required to debond orthodontic brackets on human teeth were studied in vitro. The brackets were bonded with different glass ionomer cements (GICs), and a composite resin (Concise). The shear force required to remove the brackets was recorded at different time intervals after bonding. The bond strength was considerably lower for the GICs compared with brackets bonded with the composite resin, at all time intervals that were studied. Moreover, the bond strength increased more slowly for the GICs compared with the resin. Different GICs displayed a varying setting time. The bonding strength of GICs increased more than 50 per cent between 10 and 20 minutes setting time.
在体外研究了使正畸托槽从人牙上脱粘所需的力。托槽用不同的玻璃离子水门汀（GIC）和一种复合树脂（Concise）进行粘结。在粘结后的不同时间间隔记录移除托槽所需的剪切力。在所有研究的时间间隔内，与用复合树脂粘结的托槽相比，GIC的粘结强度显著更低。此外，与树脂相比，GIC的粘结强度增加得更慢。不同的GIC显示出不同的凝固时间。GIC的粘结强度在凝固时间10至20分钟之间增加超过50%。
