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After taking Alginate for future provisional, the bridge is removed. The edentulous ridge must be atrophic, as shown in low density (Fig.3: *). A 2.0 mm 1-piece implant is proper for the site, as will be shown by CT.缺牙牙槽嵴顶部（图三：*）密度低，表明骨质菲薄，
Xin Wei, DDS, PhD, MS 1st edition 04/09/2021, last revision 05/01/2021