一項由 Align Technology 所贊助、針對成人 Class I 不拔牙的輕度到中度複雜齒列案例使用 SmartTrack 材質治療所進行的研究。David W. White, Katie C. Julien, Helder Jacob, Phillip M. Campbell and Peter H. Buschang, Discomfort associated with Invisalign and traditional brackets: A randomized, prospective trial. The Angle Orthodontist Nov 2017, Vol. 87, No. 6 pp. 801-808