The 'critical healing zone' concept in implant design refers to which anatomical region and its associated biological events?
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A
The periapical region where new bone trabeculae form first
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B
The coronal 2-3mm of crestal bone where biological width establishes
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C
The apical third where vascular ingrowth initiates osseointegration
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D
The implant body mid-portion where peak stress concentrations occur