#12 MOD preparation #13 DO Amalgam Restoration

#12 MOD preparation

Good Trait

• isthmus width of 1mm
• proximal clearance of at least 0.5mm at B, L, and from Gingival Margin to adjacent teeth.
• Even pulpal depth at 1.7mm
• 5-7 degrees convergent B & L walls 
• Adjacent tooth contact is not intact (DUH!!!) 

Flaws

• Outline can flow smoother
• Proximal box width can be a little more conservative

#13 DO Amalgam Restoration

Good Trait

•  Restore major grooves, pits, and cuspal planes to normal anatomical form -> functional occlusal contact restore
• No detectable excess/flash, voids or open margins
• Optical contact with proper resistant.
• Smooth surface 

Flaws:

• Too high marginal ridge (D).
• Irregular contour
• Lack of secondary groove 
• Distal marginal ridge is bulky

BUCCAL VIEW