根据牙周袋累及的牙面数 单面袋(simple pocket):累及一个牙面 复合袋 ( compound pocket ):累及二个以上牙面 复杂袋(complex pocket):起于一个牙面,扭曲于 一个以上的牙面或根分叉区
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The offsetting technology of 2D-compound curve is a basic problem in CAD/CAM, and has been widely studied in tool path generation for pocket machining.
二维组合曲线的等距方法是CAD/CAM领域中的一个重要课题，并在型腔环切加工刀具轨迹自动生成技术中得到广泛研究。
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They will pay those bills out of pocket, allowing their HSAs to compound tax-free as de facto IRAs.
FORBES: Saving for Your Health
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