Evaluation of stress distribution characteristics on various bar designs of three-implant-supported mandibular overdentures

Year 2017, Volume: 34 Issue: 1, 8 - 13, 02.01.2017

Emre Tokar , Serdar Polat , Bülent Uludağ

https://doi.org/10.17214/gaziaot.273903

Abstract

Objective: Implant-supported-overdentures, instead of conventional complete dentures, are frequently recommended to rehabilitate patients having edentulous mandible. The aim of this study was to evaluate the stress distribution characteristics of mandibular implant-supported overdentures with four different bar attachment designs.

Materials and Method: A photoelastic mandibular model with three implants (3.75 mm - 13 mm) placed at the interforaminal region was generated from a cast of an edentulous mandible. Four mandibular bar overdenture designs were fabricated: bar-clip, bar-galvano, bar-locator, and bar-ceka. Axial vertical loads (135 N) were applied to the central fossa of the right first molar area for each overdenture design. Stress concentrations were recorded photographically and analyzed visually.

Results: The tested bar attachment designs revealed low and moderate stress levels. The lowest stress was observed with the bar-clip design, followed by bar-locator, bar-ceka, and bar-galvano designs.

Conclusion: The loads were distributed to all of the implants. Studied designs experienced moderate stress levels around the loaded side implant. Bars with distally placed stud attachments and surface treatment with electroforming seems to increase stress levels around the implants.

Keywords

Dental stress analysis, denture, overlay, denture precision attachment, implant-supported dental prosthesis

Üç-implant-destekli mandibular overdenture protezlerde çeşitli bar tasarımlarının stres iletim karakterlerinin değerlendirilmesi

Abstract

Amaç: Dişsiz mandibulaya sahip hastaların tedavisinde implant-destekli overdenture protezler konvansiyonel tam protezlerin yerine sıklıkla tercih edilmektedirler. Bu çalışmanın amacı, dört farklı bar tutucu tasarımına sahip üç-implant-destekli mandibular overdenture protezlerin stres iletim karakterlerini incelemektir.

Gereç ve Yöntem: Dişsiz mandibular bir modelden interforaminal bölgesine üç implantın (3.75 mm - 13 mm)  yerleştirildiği bir fotoelastik mandibular model hazırlandı. Bu model üzerine dört farklı bar tasarımı olan mandibular overdenture yapıldı: bar klips, bar-galvano, bar-locator ve bar-ceka. Her bir overdenture tasarımında, sağ birinci molar dişin santral fossasına vertikal yükleme (135 N) yapıldı. Stres konsantrasyonları fotoğrafik olarak kaydedildi ve görsel olarak analiz edildi.

Bulgular: Çalışmada kullanılan bar tutucu tasarımları düşük ve orta derecelerde stres gösterdi. En düşük stres bulgusu bar klips tasarımında bulunurken, bar-locator, bar-ceka ve bar-galvano tasarımları bunu takip etti.

Sonuç: Uygulanan yükler bütün implantlara dağıtılmıştır. Çalışmada değerlendirilen tasarımlar yükleme yapılan taraftaki implantın çevresinde orta derecede strese sebep olmuştur. Bar tutucunun distallerine stud tutucu uygulaması ve elektroforming yüzey işlemi implantların çevresindeki stresi arttırabilir.

Keywords

Dental stres analizi, hassas tutuculu protez, implant-destekli diş protezi, protez, geçmeli

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