Surveying.pdf

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 j ---~!! ~-. - ~!!! 'f I., tr. lf.. ~lacirag swIDZe~ Iirnes Fig 7.49 Fig 7-S0 The S l. J ~ tJ~-e t~ moved marlrm 1.11ttl rnandrcl, t~ c.3~ comes mto tight conuct with u-:ie atbon mar~:.e:r Ths ,s.1ccomof1s:'led b, controlin-& the.e-.cal arm w(.h one hand wl-cle gl.King mo,emern ol s~ - \e h.ird  F,g 7-51 Sl,;.r.,cy Lnes (arto.v) arc trans- ferred to me tcei.h as a result o' contact bct.vecn ihe dental cast.ind me s,~ of.. he carbon marker.These ines represen.. the most prom1nen~ comours of rndMd- ual ~ceth at a chosen onen:.auon. Areas loc.itcd ocd:.1S21 or 1nc:1sal to survey ,nes do not display undercuts Al eas located ao1cal to sun.cy Ines are undercut rela- tue tQ the chosen path of 1n:s.crt1on. F,g 7-52 ~urvey ines (arro.v) are transferred to sof. fig 7-53 The dinician must ensure thzt survey fines tissue areas that may be contacted by COTTl)oncms ot have been trans{erred to a II faoa.l and inguai suriaces. a removable pa"'tiaJ denrure.These corrvnonly include soft tissue areas that may be contacted by nrabu!ge (bar-type) dasps.  ,, J,j. Mechanica l.pndercut's must be accurately located and~ap.propriately marked to permit correct placement of retentive clasps.  f ig 7-55 -r1e den;:al c~ lS orough· nto hgnt con~a rcui. gauge 1s place.t,1°"l!l i.ne s.'1an.~ of m~ undercut gauge. At this stage o' as.sembfos, a OOI uie oroceourie. tne head of the undercut gauge does not cont:!ct the surface of the cast. F,g 7-56 r he "crt,cal am1 of the surveyor ,s raised u~ r r r :!ad of the undei cut gauge con~acts the n- Fig 7-57 The apical border of ihis contact ,s deart, frabulge area of the tooth. The point of contact shot.!ld marked using a red pend The ~not IT0rk shouJd ap- appear a.s a very light ''scrape" (arrow) on the surface pear as a tn1n. horizontal lme approximately 2 mm in of the cast length. 001.-"1.... \. Retefiemces · Stewart's Clinical Removable Partia l Prosthodontics 4&. ed 0. 01.)-1