- 肩部及边缘扫描的原则：充分暴露且清晰，无唾液或血液。
- 准备龈下刀片状边缘，要求深度一致， 不伤牙龈，无出血、无肿胀。
3.若基台带有肩台（非龈上肩台），则必须做龈排治疗；若为龈下肩台，建议做双线龈排治疗。
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