title: Mechanical and biological complication rates of the modified lateral-screw-retained implant prosthesis in the posterior region: an alternative to the conventional Implant prosthetic system.
abstract: OBJECTIVE
  The modified lateral-screw-retained implant prosthesis (LSP) is designed to combine the advantages of screw- and cement-retained implant prostheses. This retrospective study evaluated the mechanical and biological complication rates of implant-supported single crowns (ISSCs) inserted with the modified LSP in the posterior region, and determined how these complication rates are affected by clinical factors.
  
  
  METHODS
  Mechanical complications (i.e., lateral screw loosening [LSL], abutment screw loosening, lateral screw fracture, and ceramic fracture) and biological complications (i.e., peri-implant mucositis [PM] and peri-implantitis) were identified from the patients' treatment records, clinical photographs, periapical radiographs, panoramic radiographs, and clinical indices. The correlations between complication rates and the following clinical factors were determined: gender, age, position in the jaw, placement location, functional duration, clinical crown-to-implant length ratio, crown height space, and the use of a submerged or nonsubmerged placement procedure.
  
  
  RESULTS
  Mechanical and biological complications were present in 25 of 73 ISSCs with the modified LSP. LSL (n=11) and PM (n=11) were the most common complications. The incidence of mechanical complications was significantly related to gender (P=.018). The other clinical factors were not significantly associated with mechanical and biological complication rates.
  
  
  CONCLUSIONS
  Within the limitations of this study, the incidence of mechanical and biological complications in the posterior region was similar for both modified LSP and conventional implant prosthetic systems. In addition, the modified LSP is amenable to maintenance care, which facilitates the prevention and treatment of mechanical and biological complications.
authors.affiliation: Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
authors.forename: Jae-Hong
authors.identifier: 0000-0002-2375-0141
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Periodontology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea.
authors.forename: Jong-Bin
authors.identifier: 0000-0002-6800-4337
authors.initials: JB
authors.lastname: Lee
authors.affiliation: Department of Prosthodontics, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea.
authors.forename: Man-Yong
authors.identifier: 0000-0002-8959-935X
authors.initials: MY
authors.lastname: Kim
authors.affiliation: Department of Prosthodontics, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea.
authors.forename: Joon-Ho
authors.identifier: 0000-0002-4571-7342
authors.initials: JH
authors.lastname: Yoon
authors.affiliation: Department of Periodontology, Research Institute for Periodontal Regeneration, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
authors.forename: Seong-Ho
authors.identifier: 0000-0001-6704-6124
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Department of Periodontology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea.
authors.forename: Young-Taek
authors.identifier: 0000-0002-5132-5783
authors.initials: YT
authors.lastname: Kim
keywords: Dental implant; Dental prosthesis design; Peri-implantitis; Prosthesis failure; Single-tooth implant