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Alex Complex Amalgam

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  Alex ChenComplex amalgam preparation & restoration  _________________________________________________________________________________________________________________________________  Complex Amalgam Preparation & Restoration  Alex Chen Dent 430 ePortfolio Faculty of DentistryUniversity of British Columbia  Page 1 of 15  Alex ChenComplex amalgam preparation & restoration  _________________________________________________________________________________________________________________________________  Complex Amalgam Preparation critical reuirements Tooth: 46 MODB Criticalrequirements of this procedureRationale of requirements and supporting literatureNew skills accomplished in this excercise,problems encountered, and breakthroughmoments id m! productmeet theserequirements Class ## Amalgam$ Reerse !1 The reerse ! shape# is nee#e# #$e to the %i#ening of the preparation of the proximal ox The ! shape allo%s the proximal ox to maintain '( o )aos$rfa)e an# opening $))al*ling$al )onta)ts%hile presering so$n# tooth str$)t$re at the same time +!)h%art, et al- .((6/ . 0t sho$l# e note# that the reerse !2 is not al%a3s nee#e# an# sometimes een e)omes a !2 shape #epen#ing on the lo)ation of the )onta)t %iththe a#a)ent tooth To a)hiee a reerse !2 +%hen nee#e#/-0 learne# to )$t the proximal ox part an# o))l$sal part of the preparation separatel3 an# finall3 oin them together This ens$re a #istin)t !2 shape# preparation is forme# es %pen interproximal contact 1 Allo%s is$al erifi)ation that all )aos$rfa)e margins are pla)e# in so$n# tooth str$)t$re +Roertson et al - .((6/ . Conenien)e of a))ess for finishing an#  polishing  Allo% self7)leansing of the )aos$rfa)e margin to #e)rease ris8 of pla9$e a))$m$lation an# se)on#ar3 )aries +athi an# Morta,ai- .((4/ ;The a#antage of not rea8ing the )onta)t is the The proximal )onta)t %as #iffi)$lt to open as it $s$all3 en# $p too %i#e M3 sol$tion %as opening the )onta)t slightl3 %ith a fine nee#le nose# $r es  Page . of 15  Alex ChenComplex amalgam preparation & restoration  _________________________________________________________________________________________________________________________________  )onseration of tooth str$)t$re an# etter ens$re of  proximal )onta)t <en)e- %e m$st e )aref$l not to ex)essiel3 an# $nne)essaril3 remoe ex)ess so$n#tooth str$)t$re %hen rea8ing the )onta)t +A8eroom et al - .((6/ '( to ca)osurface The '(= to )aos$rfa)e ma8es s$re that there>s no $n#ermine# enamel ro#s Also- it ma8es s$re the amalgam is of s$ffi)ient $l8 than if the angle is too a)$te This #e)reases the )han)e of the enamel or amalgam fra)t$res +Roerson- .((6/ This %as fairl3 eas3 to a)hiee 3 )he)8ing the preparation from o))l$sal ie% es *alls con)ergent occlusall! O))l$sal )onergen)e resists restoration #islo#gement o))l$sall3 3 me)hani)al retention +!$mmit et al - .((6/ 0 ha# no tro$le %ith this re9$irement es + shelf$  1 Parallel to o))l$sal plane . ?$st into #entin lat an# e9$al %i#th thro$gho$t1 The parallelism of $))al shelf to o))l$sal plane gies it the most resistan)e to%ar#s o))l$sal loa#  3 eliminating the ramp effe)t that %o$l# o))$r if the shelf an# o))l$sal plane are not parallel The  parallelism also ens$res that the res$lting amalgam restoration %ill e e9$al in thi)8ness tho$gho$t the o))l$sal plane- %hi)h helps resist fra)t$re . The shelf is $st into #entin to ens$re s$ffi)ient  $l8 for the amalgam restoration to resist fra)t$re   The shelf is flat to ens$re that the res$lting amalgam restoration %ill e e9$al in thi)8ness #is)$sse# in point 1 0 learne# to $se the ( $r length as a g$i#e for #epth Also- 0 smoothen an# flatten the shelf 3 r$nning a $r a)ross it at @.( spee# es  Page  of 15  Alex ChenComplex amalgam preparation & restoration  _________________________________________________________________________________________________________________________________  Pulpal slot$ 1 0n area of )entral grooe. At least 1mm in #epth  A))ommo#ates smallest )on#enser 1 P$lpal slot is pla)e# in the area of )entral grooe  e)a$se that>s %here the p$lp is f$rtherst a%a3 from the o))l$sal plane <en)e- a p$lpal slot at this lo)ation has the least )han)e of p$lpal expos$re +Mor et al - .((6/ . The 1mm #epth is to gie the amalgam restoration s$ffi)ient $l8 to resist #islo#gement +M)Daniel et al - .(((/ The a))ommo#ation of the smallest )on#enser is for proper )on#ensation of amalgam #$ring restoration 0 $se ( $r +.mm length/ as a g$i#e for length an# al%a3s )he)8 to see if thea small )on#enser )an fit in m3  preparation  *A Proximal trough : 1 B$tts $p against axial %all . At least 1mm in #epth A))epts smallest)on#enser 4 ( 5mm into #entin1 The proximal tro$gh )onta)ts the axial %all . At least 1mm in #epth proi#es the amalgam restoration %ith $l8 to proi#e resistan)e to #islo#gement an# fra)t$re +M)Daniel et al - .(((/ The a))ommo#ation of the smallest )on#enser is for proper )on#ensation of amalgam #$ring restoration 4 The tro$gh nee#s to e at least ( 5mm into #entinto preent the o$ter %all of the tro$gh from fra)t$ring #$e to thin remaining tooth str$)t$re 0 learne# to ma8e s$re m3 tro$gh $tts $p against the axial %all 3 onl3 lightl3 mar8 the position of m3 tro$gh an# )he)8 to see if 0>m satisfie# %ith the  positioning efore 0 start )$tting #o%n more aggressiel3 es Pin$ 1 Parallel to )aos$rfa)e. ?$st into #entin  Clearan)e of 1 The pin parallels the )aos$rfa)e to preent  perforating the tooth as the tooth tapers to%ar#s )eri)al . The pin is $st into #entin to #e)rease the ris8 of 0 #i# not hae prolem %ith pla)ing the  pin  *A  Page 4 of 15
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