where, Y: crowning {HEAD ~ curve} having {TAIL ~ an origin} at the tooth surface at the center of the tooth thickness, 
having
where , Y : crowning { HEAD ~ curve } having { TAIL ~ an origin } at the tooth surface at the center of the tooth thickness ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH