Elongation and preload stress in dental implant abutment screws.

J. E. Haack, Ronald Sakaguchi, T. Sun, J. P. Coffey

Research output: Contribution to journalArticle

197 Citations (Scopus)

Abstract

A common problem associated with dental implant restorations is loosening of screws that retain the prosthesis to the implant. A method was developed to determine initial preload on UCLA-type abutment screws by measuring elongation after applying known tightening torques with a digital torque gauge. Loosening torque was also measured after tightening to 32 N-cm torque for gold alloy abutment screws and 20 N-cm for titanium abutment screws. Gold alloy and titanium abutment screws were each used to secure a gold UCLA hexed abutment to a titanium implant. Stresses and forces were calculated from the elongation measurements for three regions of each screw. Elongation of the screws after applying the manufacturer's recommended tightening torques were within the elastic range. Induced stresses were 57.5% and 56% of the yield strengths for gold alloy and titanium, respectively. Tightening of screws beyond recommended levels may be possible without producing plastic deformation. At manufacturer's recommended torques, mean preload was 468.2 (+/- 57.9) N using gold alloy screws and 381.5 (+/- 72.9) N with titanium screws.

Original languageEnglish (US)
Pages (from-to)529-536
Number of pages8
JournalThe International journal of oral & maxillofacial implants
Volume10
Issue number5
StatePublished - Sep 1995

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Dental Abutments
Dental Implants
Torque
Titanium
Gold Alloys
Gold
Plastics
Prostheses and Implants

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Elongation and preload stress in dental implant abutment screws. / Haack, J. E.; Sakaguchi, Ronald; Sun, T.; Coffey, J. P.

In: The International journal of oral & maxillofacial implants, Vol. 10, No. 5, 09.1995, p. 529-536.

Research output: Contribution to journalArticle

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