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