The originally designed long axes of implants at the tooth #7 (Fig.6) and #8 (Fig.7) are determined by wax-up, but they are not aligned well with the long axis of the alveolar ridge.  In fact, the long axis of the natural tooth (#9 in Fig.8) is also not coincided with that of the ridge.  That is, the root of the right central incisor is not inserted in the middle of the ridge.  This orientation is good from the prosthetic point of view, but we cannot place the largest and longest implant, or fenestration is most likely to happen labially.  An oral surgeon would like to place an implant (black box) along the long axis of the ridge (Fig.7').  Back to main text