Four different glass ionomer cements were evaluated in vivo as luting agents for orthodontic mohu bands. A sample of 199 patients with full fixed appliances (Begg Light Wire) were monitored over a period of 12 months during active treatment for loose molar bands. Failures for each edment were: Fuji I, 2-5 percent, Fuji II, 4-5 percent, Ketac- Cem, 4-0 percent and Hy-Bond Luting, 3-0 percent. Chi squared tests showed no statistical difference in failure rates for each cement.