When placing porcelain veneers on teeth #8 and #9, where there is an existing black triangle, what is the best interproximal preparation design?
A. Preparation with equi-gingival finishing line
B. Preparation that breaks thru the interproximal contact to the lingual line angle
C. Interproximal preparation with axial depth of at least 1.0 mm
D. Preparation with deep-chamfer finishing line
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