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There is approximately 2 mm bone superior to the apex of the tooth #13 for primary stability (Fig.7 (sagittal section)). A long implant (4.5x15 mm) is placed with sinus lift (Fig.8 *).近中，远中骨壁（长）帮助植体稳定性。
Xin Wei, DDS, PhD, MS 1st edition 01/24/2019, last revision 06/13/2021