* S for duplication of facial and lingual contours due to under contoured facial/buccal surfaces.
* R for duplication of occlusal surfaces and occlusal contacts because waxup presents ideal shape, ridges, and correct centric and eccentric occlusal stops.
* R for duplication of proximal contacts and embrassure surfaces because waxup presents nearly ideal shape, size and location of proximal contact areas and four embrassure spaces
* R for overall tooth anatomy because waxup presents ideal shape
* R for smoothness of wax surfaces because waxup exhibits luster and smoothness with lack of surface roughness.