Objective To reconstruct 3D shape of edentulous jaw by using improved measurement system and to analyze the precision of this method.Methods Standard edentulous jawmodels were measured with a improved measurement system by cut- ting and scanning layer-by-layer, and the 3D shape of the models was reconstructed by image processing with specialty software. Ten cubic plaster modes were reconstructed by the same way, data of every border before and after reconstruction were measured and analyzed.Results Data of edentulous jawmodelswere obtained. The errors in ten cubic before and after reconstructionwere not significantly different(P>0·05), data measured in horizontal plane were not significantly different(P>0·05), and data measured in altitude directionwere significantly different(P
