Edentulism is rated between 7 and 69% internationally [1]. Many biological and non-bilogical predisposing factors lead to the main result of edentulism [2]. Regardless the debate to understand the way of resorption [3], the loss of periodontal ligament by tooth extraction leaves alveolar bone without a chance of reformation which leads to bone resorption only. The resorption shows variation in rate with recorded fast bone loss at the first 6 months after extraction and the following 2 years [4].

As pernicious sequelae of edentulism, the patient lacks most of the ordinary oral function which requires planned rehabilitation. Implant therapy is one of the recent trends to restore oral functions [5–7]. Besides the rehabilitation purposes, implants show other favorable biological effects on the bone state. Many authors [8–10] revealed the ability of the implant to regain bone density at healing and adapt to the applied load. As an evitable fate, residual alveolar ridge shows resorption under the conventional complete denture. This varies according to prosthetic planning, construction, and maintenance, as well as systemic predisposing factors [11–13]. Although the presence of implant beneath complete or partial denture improves denture foundation and augments patient satisfaction [7, 14], there is a controversy about the role of implant overdenture in the process of ridge reshaping after loading.

The tracing of the bone resorption is difficult for the complete denture with the continuous rated atrophy of the residual alveolar ridge beneath the conventional denture [15, 16]. Rather than monitoring the bone atrophy, this review investigates the capability of the implant to be responsible for preserving residual alveolar ridge bone and the role of implant-assisted restoration to reduce the alveolar ridge atrophy.

The (PIO) question to be focused was “In patient with implant restoration, what is the chance of residual alveolar ridge preserving and bone formation in the adaptive remodeling and what are the features of this preservation?”