Fig. 1

Treatment progress of the 10-year-old girl with a fused left lateral incisor. (A–D) pretreatment intra-oral photograph and panoramic and periapical radiographs, (E–F) 3-dimensional reconstructed images and coronal views of CBCT, (G) the root canal treatment of double incisor, (H–K) the hemisection procedure with Er:YAG laser, Nd:YAG laser application to root surface and replantation of the tooth, (L–M) the semi-rigid fixation after the replantation, (N–O) Nance appliance and orthodontic alignment, (P–S) intraoral photograph, panoramic radiograph, coronal and axial views of CBCT 5 years after the replantation, (T) digital radiograph 9 years after replantation, (U–X) intraoral photograph, panoramic radiograph, axial and coronal views of CBCT 11 years after replantation, (Y) Final intraoral photograph after restoration renewal