Post on 15-Nov-2014
Inaly and Onlay
Forsingletoothrestoration Onlay:allcusp Inlay:additionaltooth removalisnecessary Proximalextension=>metaldisplay,gingival encroachment Cuspfractureduetowedgingfromtheinlay
Armamentarium
Carbidebursareusually used tapered/round/cylindrical carbidebur Finishingstones Chisel/Hatchet/gingival margintrimmers
Class II Inlay preparation
Marginsoftherestorationshouldnotbetoocloseto acentriccontact(groove withgingivalmargin trimmer Gingivalmargin:45 degree:taperbur(fine gritdiamond) Proximalbevels:taper bur
Groove and bevel
Occlusalbevel:chamfer hollowgroundbevel roundburorstone
MOD Onlay preparation
Penetratecetralgroove 1.8mm Incooperatingdeep buccallingualgrooves Removeallamalgam restoration
Outline Form
ExtendM&Ltoheight ofcontourofmarginal ridge BOX:gingivalB/L Clearance:0.6mm Sometimesrestoration andcariesrequirebox extendbeyondoptimal Ifextensionbeyondline
Caries Excavation
Removecarieswithexcavator(lowspeedroundbur) Placecementbasetorestore Adequatesounddentinispresentonaxialwallsto provideretentionandresistance
Occlusal reduction
Functionalcuspguiding groove:1.3mm+ 0.2mmforsmoothing Burmorehorizontal thanintended restorationcusp Noncentriccusp:0.8mm Burparalleltocuspal
Occlusal reduction
1.0mmcentricacusp ledgewithcylindrical bur(providebulk) About1mmapicalto theopposingcentric contacts Cannotbetooapical resistanceformfrom boxwouldbelost
Bevel (margin placement)
Gingivalbel:45degree B/Lbevel Cuspbevel: roundtippeddiamond; chamferbevel