A 29-year-old woman requests implant for the residual root of the tooth #4 after initial RCT in home country (Fig.1,2 (S: sinus)).  图一拍摄平行，失真少，但是没有拍摄到4号牙顶端的上颌窦

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Xin Wei, DDS, PhD, MS 1st edition 06/14/2021, last revision 07/01/2021