Class III Caries Lesion
• Proximal contact of anterior teeth• Begins at ginigval edge of contact area• Requires higher risk than pit & fissure caries
Mandibular incisor
Maxillarylateral inciso
Maxillary canine
cavitated lesion at contact area
Class III Preparation Features
• Labial or Lingual Access
caries lesion
contact area
#9-M Class III cavity preparation
lingual-approach
#9-M Class III cavity preparation
lingual-approach
Lingual access outline form best esthetics
#9-M Class III cavity preparation
lingual-approach
Labial access outline formpreserves marginal ridges
Class III Preparation Features
• Labial or Lingual Access• Outline Form: Lesion-Specific• Extension: Incisal wall still in contact• Proximal Depth & I-G Dimension prescribed
3 mm
1.0-1.25 mm
Class 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 bur
enamel lip
Class 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
bevel fades out
continuous bevel
bevel fades out
Purpose of Bevel:
• better etch pattern
• increases enamel surface area being bonded
• increases overall retention
• improves marginal seal
• eases shade transition
Class 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 blood
Isolate from #5 to #12Isolate from #5 to #12
#8-D
Shaft of bur shouldnot be parallel toproximal plane
#2 round burhigh speed
Access throughlabial embrasure
Center on gingival edge of contact area
#2 round bur: head diameter 1.0 mm
Rounded box form 3 mm I-G X 1-1.25 mm M-D
Access through labial embrasure
Extend lingually until contact broken
ProximalContact
Area
Gingival
Labial wa
Axial wal
Lingual w
Incisal wa
Lingual contact broken
Error?
Incisal contact broken
Lingual still in contact
Error?
Error?
Centered on contact
Incisal contact broken
Error?
111 Hoe
#7902Needle finishing bur
0.5-1.0 mm bevel 20-45
#9-M Lingual Approach#9-M Lingual Approach
NoNo
YeYe
Jeffery 7Jeffery 7(Jeffery 7 LH)(Jeffery 7 LH)
79027902Needle finishing burNeedle finishing bur
9-M(Li)9-M(Li)
9-M(Li)9-M(Li)8-D(F)8-D(F)
#10-D Lingual Approach#10-D Lingual Approach NoNo
YeYe
NoNo
YeYe
Error?
Facial contact
Error?
Error?
Unsupported enamel
Error?
Error?
Centered on contact
Error?
Error?
No gingival wall
Error?
Error?
No incisal contact
Error?
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