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银汞充填的Ⅱ类洞制备主要考虑三个方面:使牙齿与修复体能具有足够的强度;充填后易于清洁;有足够的固位力和适当的抗力形。Baum认为窝洞如果扩展到牙尖斜面,将使银汞修复体在洞缘斜面角部分受到不必
Silver-mercury filled Class II holes are prepared mainly in three areas: the teeth and prosthesis can have sufficient strength; easy to clean after filling; have sufficient retention and appropriate resistance form. Baum that the nest hole if extended to the cusp, will make the amalgam restoration at the edge of the bevel edge part of the unnecessary