Class III Caries Lesion• Proximal contact of anterior teeth• Begins at ginigval edge of contact area• Requires higher risk than pit & fissure cariesMandibular incisorMaxillarylateral incisoMaxillary caninecavitated lesion at contact areaClass III Preparation Features• Labial or Lingual Accesscaries lesioncontact area#9-M Class III cavity preparationlingual-approach#9-M Class III cavity preparationlingual-approachLingual access outline form best esthetics#9-M Class III cavity preparationlingual-approachLabial access outline formpreserves marginal ridgesClass III Preparation Features• Labial or Lingual Access• Outline Form: Lesion-Specific• Extension: Incisal wall still in contact• Proximal Depth & I-G Dimension prescribed3 mm1.0-1.25 mmClass III Preparation Features• Labial or Lingual Access• Outline Form: Lesion-Specific• Extension: Incisal wall still in contact• Proximal Depth & I-G Dimension prescribed• Walls: smooth• Internal Line Angles: rounded, no retentive features• Cavosurface Margins: crisp, smooth, free of loose enamel#245 burenamel lipClass III Preparation Features• Labial or Lingual Access• Outline Form: Lesion-Specific• Extension: Incisal wall still in contact• Proximal Depth & I-G Dimension prescribed• Walls: smooth• Internal Line Angles: rounded, no retentive features• Cavosurface Margins: crisp, smooth, free of loose enamel• Cavosurface Bevelbevel fades outcontinuous bevelbevel fades outPurpose of Bevel:• better etch pattern• increases enamel surface area being bonded• increases overall retention• improves marginal seal• eases shade transitionClass III Preparation Features• Labial or Lingual Access• Outline Form: Lesion-Specific• Extension: Incisal wall still in contact• Proximal Depth & I-G Dimension prescribed• Walls: smooth• Internal Line Angles: rounded, no retentive features• Cavosurface Margins: crisp, smooth, free of loose enamel• Cavosurface Bevel• Cleanliness: free of debris, uncontaminated by saliva or bloodIsolate from #5 to #12Isolate from #5 to #12#8-DShaft of bur shouldnot be parallel toproximal plane#2 round burhigh speedAccess throughlabial embrasureCenter on gingival edge of contact area#2 round bur: head diameter 1.0 mmRounded box form 3 mm I-G X 1-1.25 mm M-DAccess through labial embrasureExtend lingually until contact brokenProximalContactAreaGingival Labial waAxial walLingual wIncisal waLingual contact brokenError?Incisal contact brokenLingual still in contactError?Error?Centered on contactIncisal contact brokenError?111 Hoe#7902Needle finishing bur0.5-1.0 mm bevel 20-45#9-M Lingual Approach#9-M Lingual ApproachNoNoYeYeJeffery 7Jeffery 7(Jeffery 7 LH)(Jeffery 7 LH)79027902Needle finishing burNeedle finishing bur9-M(Li)9-M(Li)9-M(Li)9-M(Li)8-D(F)8-D(F)#10-D Lingual Approach#10-D Lingual ApproachNoNoYeYeNoNoYeYeError?Facial contactError?Error?Unsupported enamelError?Error?Centered on contactError?Error?No gingival wallError?Error?No incisal