title: To what extent residual alveolar ridge can be preserved by implant? A systematic review.
abstract: BACKGROUND
  It has been reported that the load for (or to) implant-supported restoration may lead to bone remodeling as bone resorption and/or formation. While many authors supported the process of bone resorption, others elaborated bone apposition and increasing bone density close and remote to implant body (or fixture). This may suggest the role of the implant to reserve alveolar ridge from physiologic/pathologic resorption. The aim of this systematic review was to predict to how extend dental implants can preserve the residual alveolar ridge based on previous clinical investigations.
  
  
  METHODS
  This systematic review based on the retrospective and prospective studies, randomized clinical trial, and case reports. The process of searching for proposed articles included PubMed, Ovid, and Web of Science databases, with specific inclusion and exclusion criterion.
  
  
  RESULTS
  A total 2139 citations were identified. After expunging the repeated articles between databases and application of exclusion and inclusion criteria, 18 articles were found to meet the topic of this systematic review. Many of the articles reported bone preservation with implant-assisted restorations, and the rest denoted noticeable bone apposition.
  
  
  CONCLUSIONS
  According to the published clinical studies, the behavior of bone remodeling around implant predicts a sort of residual alveolar bone preservation.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Mansoura University, 68 ElGomhoria Street, ElMansoura, 35516, Egypt.|Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
authors.forename: Ahmed Khalifa
authors.initials: AK
authors.lastname: Khalifa
authors.affiliation: Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan. masahiro@dent.osaka-u.ac.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Wada
authors.affiliation: Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Ikebe
authors.affiliation: Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Maeda
keywords: Alveolar bone remodeling; Dental implants; Ridge preserving