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