Whether or not dental implants can be placed in alveolar bone atrophy can be decided on a case-by-case basis. If the width and height of the alveolar bone can accommodate the implant and there is no progressive bone resorption, the gum can be cut, the soft tissue can be separated, and the implant can be placed in the alveolar bone. If the alveolar ridge is narrower, bone splitting can be performed, and bone powder can be filled in after placing the implant to increase the width of the alveolar bone. If the top of the alveolar ridge is too close to the floor of the maxillary sinus, an internal or external elevation of the maxillary sinus can be performed before completing the dental implant surgery. If the alveolar bone is severely atrophied, autologous bone grafting can be performed to increase the bone volume before dental implantation. In case of severe horizontal alveolar bone atrophy with full periodontal disease, dental implants are not suitable.