Is Closed-Bar Design a Better Option for All-on-Four Concept ?

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Pervanlı N., Polat C., Koç O.

The 48th Annual EPA Congress, Nevşehir, Turkey, 11 - 13 September 2025, pp.1-32, (Full Text)

  • Publication Type: Conference Paper / Full Text
  • City: Nevşehir
  • Country: Turkey
  • Page Numbers: pp.1-32
  • Open Archive Collection: AVESIS Open Access Collection
  • Yıldız Technical University Affiliated: Yes

Abstract

Is Closed-Bar Design a Better Option for All-on-Four Concept ?

All-on-Four Konsepti İçin Kapalı Bar Tasarımı Daha İyi Bir Seçenek Mi?

 

When tilted implants are incorporated into a multi-implant prosthesis, the distribution of implants and prosthetic rigidity help reduce or modify these bending forces, lowering their negative impact.

Analyse the stress distribution in the implant, bone and prostheses with distal implants placed at 30 and 45 degrees and evaluate the effectiveness of a bar-supported design.

 

  Model I: A straight implant and abutment were placed at a 30° angulation in the maxillary bone, positioned at the level of the second premolar.   

  Model II: The implant placement were identical to Model I. In addition, a palatal bar design was incorporated into the framework at the level of the first molar.   

  Model III: A straight implant and abutment were placed at a 45° angulation in the maxillary bone, positioned at the level of the second premolar.   

  Model IV: The implant placement were identical to Model III. Additionally, a palatal bar design was incorporated into the framework at the level of the first molar