Medical Engineering & Physics
Volume 31, Issue 7 , Pages 758-763, September 2009

Effects of prosthesis design and impression techniques on human cortical bone strain around oral implants under load

  • Kıvanç Akça

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, 06100 Sihhiye, Ankara, Turkey
    • Corresponding Author InformationCorresponding author at: Çetin Emeç Blv, 6. Cadde, 54/3 06450, Öveçler, Ankara, Turkey. Tel.: +90 312 4726898; fax: +90 312 3113741.
    • ,
  • Ali Murat Kokat

      Affiliations

    • Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Bagdat Str. No: 238, 34728 Goztepe, Istanbul, Turkey
    • ,
  • Saime Sahin

      Affiliations

    • Section of Prosthodontics, Çeşme, İzmir, Turkey
    • ,
  • Haldun Iplikcioglu

      Affiliations

    • Section of Prosthodontics, Primedent, Zakkum Sok. No: 2, Levent, İstanbul, Turkey
    • ,
  • Murat Cavit Cehreli

      Affiliations

    • Section of Prosthodontics, CosmORAL Oral and Dental Health Polyclinics, Cinnah Cad. 7/5 06680 Kavaklidere, Ankara, Turkey

Received 4 September 2008; received in revised form 7 February 2009; accepted 10 February 2009. published online 09 March 2009.

Abstract 

Purpose

The purpose of this study was to evaluate the effects of two different prosthetic designs (screw-retained versus cement-retained) and two impression techniques (open versus closed tray) on bone-level strains around implants.

Materials and methods

Two Ø 4.1mm×10mm Straumann implants were placed in the bilateral fibulas of six fresh cadavers; bone segments were removed en bloc. Twelve implant-level and six abutment-level (18 total) working casts were made to fabricate fixed partial dentures, resulting in three test groups: Group 1: closed-tray technique/implant-level model/screw-retained prostheses; Group 2: closed-tray technique/abutment-level model/cement-retained prostheses; Group 3: open-tray technique/implant-level model/screw-retained prostheses. Linear strain-gauges were bonded to the cortical bone between implants and the lateral wall of the fibula in close proximity to the implant necks in each bone fragment. Strain-gauge signals were digitized by a data acquisition system and corresponding software at a sample rate of 10KHz, simultaneously monitored from the computer during application of an external static load of 150N on the middle of the pontic, using a loading frame.

Results

The approximal and lateral strains were extremely similar in both prosthetic groups (p>0.05). Within-group comparisons for the indirect impression technique showed that approximal and lateral strains in screw- and cement-retained prostheses were similar (p>0.05). Neither the prostheses design nor the impression technique had any discernable effect on bone-level strain.

Conclusion

Strains on the cortical bone around two implant supported, 3-unit screw- or cement-retained fixed prostheses, fabricated either by direct or indirect impression techniques on Straumann dental implants, are similar under a 150N static load.

Keywords: Dental implants, Impression, Fixed prosthesis, Passive fit, Fibula, Biomechanics, Strain-gauge analysis

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PII: S1350-4533(09)00056-3

doi:10.1016/j.medengphy.2009.02.005

Medical Engineering & Physics
Volume 31, Issue 7 , Pages 758-763, September 2009

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