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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。