#14 MO Preparation #12 MOD Composite Restoration

#14 MO Preparation

 Good Traits:

• good isthmus width of 1mm
• proximal clearance of at least 0.5mm at B, L, and from Gingival Margin to adjacent teeth.
• Proximal box meets external surface at 90 degrees
• Even pulpal depth at 1.7mm
• 5-7 degrees convergent B & L walls 
• Adjacent tooth contact is not intact 

Flaws:

• Axiopulpal line angle is not rounded. 
• Carvosurface margins and wall of preparation are rough and can be smoother
• Overall preparation outline can be more conservative.

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#12 MOD (class II) Composite Restoration