Optimal treatment plan is always compromised by patients' factors.The skeletal pattern of double dentoalveolarprotrusion combined with minor space deficiency is very common in the Oriental population.In this kind ofbordline case,it can be treated by extraction or non-extraction plan.Traditionally,the end results with two differentapproaches are both acceptable in general consensus with orthodontists.In fact,the values from cephalometricanalysis in non-extraction group are far away from those treated by optimal treatment plan.Now orthodontists mayhave another point of view towards the standard of acceptable treatment results under interdisciplinary oralrehabitation.(J.Taiwan Assoc.Orthod.14(3):39-46,2002)