title: Finite element analysis on stress distribution of maxillary implant-retained overdentures depending on the Bar attachment design and palatal coverage.
abstract: OBJECTIVE
  The purpose of this study was to determine the effect of anchorage systems and palatal coverage of denture base on load transfer in maxillary implant-retained overdenture.
  
  
  METHODS
  Maxillary implant-retained overdentures with 4 implants placed in the anterior region of edentulous maxilla were converted into a 3-D numerical model, and stress distribution patterns in implant supporting bone in the case of unilateral vertical loading on maxillary right first molar were compared with each other depending on various types of anchorage system and palatal coverage extent of denture base using three-dimensional finite element analysis.
  
  
  RESULTS
  In all experimental models, the highest stress was concentrated on the most distal implant and implant supporting bone on loaded side. The stress at the most distal implant-supporting bone was concentrated on the cortical bone. In all anchorage system without palatal coverage of denture base, higher stresses were concentrated on the most distal implant and implant supporting bone on loaded side.
  
  
  CONCLUSIONS
  It could be suggested that when making maxillary implant retained overdenture, using Hader bar instead of milled bar and full palatal coverage rather than partial palatal coverage are more beneficial in distributing the stress that is applied on implant supporting bone.
authors.affiliation: Department of Prosthodontics, Wonkwang University Sanbon Dental Hospital and Institute of Wonkwang Dental Research, Iksan, Republic of Korea.
authors.forename: Min-Jeong
authors.identifier: 0000-0002-4114-3249
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Department of Conservative Dentistry, Wonkwang University, Iksan, Republic of Korea.
authors.forename: Sung-Ok
authors.identifier: 0000-0001-5756-3339
authors.initials: SO
authors.lastname: Hong
keywords: Attachment; Complete denture; Dental implants; Finite element analysis; Overdenture