Nonlinear contact analysis of preload in dental implant screws

Ronald Sakaguchi, Svenn E. Borgersen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Clinical studies indicate that loosening or fracture of dental implant prostheses occurs in 5% to 45% of cases during the first year. The nature of loosening or displacement of prosthetic components is complex, since it involves cycling fatigue, oral fluids, and varied chewing patterns and loads. A finite element contact analysis method was used to study the load-transfer mechanism between prosthetic components caused by torque application to the threaded fasteners used for assembly. Screw elongation is achieved while allowing for elastic recovery of the screw to produce a clamping force on the fastened elements. Clamping forces were additive along the axis of the prosthetic components. When the gold retaining screw is fastened into the abutment screw, clamping force on the implant is increased at the expense of decreasing the clamping force at the abutment screw-abutment interface by 50%. Maximum tensile stresses in the screws after preload were less than 55% of the yield stress.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalInternational Journal of Oral and Maxillofacial Implants
Volume10
Issue number3
StatePublished - 1995
Externally publishedYes

Fingerprint

Dental Implants
Constriction
Dental Prosthesis
Finite Element Analysis
Mastication
Torque
Gold
Fatigue

Keywords

  • Biomechanics
  • Contact analysis
  • Finite element analysis
  • Implants
  • Prosthetics

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Nonlinear contact analysis of preload in dental implant screws. / Sakaguchi, Ronald; Borgersen, Svenn E.

In: International Journal of Oral and Maxillofacial Implants, Vol. 10, No. 3, 1995, p. 1-14.

Research output: Contribution to journalArticle

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