3Buchanan l B,Russell J l,Clark J D.Practical aplication of the PAR index:all illustTative comparison of the outcome oftreatment using two fixed appliance techniques[J].Br J Orth-od,1996,23:351-357.
4Birkeland K,Furevik J.Bee O E,et al.Evaluation of treat-ment and post-treatment changes by the PAR index[J].Eur J Orthod,1997,19(3):279-288.
10McGorray SP, Wheeler TT, Keeling SD, et al. Evaluation of orthodontists' perception of treatment need and the peer assessment rating (PAR) index. Angle Orthod, 1999, 69(4) :325 -333.
