One-piece versus two-piece dental implants

Document Type : Original Article

Authors

1 Assistant Professor Prosthodontic department, faculty of oral and dental medicine and surgery, Cairo University

2 Prosthodontic department, National research center, Egypt

3 Mechanical Engineering Department, National research center, Egypt

4 Faculty of dentistry, Minia University

Abstract

Abstract:
Aim: it was aimed to estimate the effect of using one piece implant in comparison to two piece one on surrounding bone.
Methods: two three dimensions finite element models were prepared for this study. Standard 3x10mm single piece implant was scanned, and lower first premolar crown was designed, to be placed on it, using ExoCAD. The scanned implant was modified on SoliWorks to be two pieces by adding 1.5mm screw to the abutment part. Bone and mucosa were simplified as three coaxial cylinders, to place the implant in its axis. Lower surface of the cortical bone cylinder was set to be fixed in place as boundary condition. Vertical load of 100N was located at buccal cusp, and distal fossa, and the oblique load of 45º was located at buccal cusp slope, were applied as two loading cases on each model.
Results: the obtained results indicated that one piece implant generated higher stresses on cement layer, and cortical bone in comparison to two pieces implant. On the other hand, crown body above one piece implant received less stresses, by about 5% and 7.5% under vertical and oblique loads respectively, in comparison to two pieces implant.
Conclusions within limitations of this study derived conclusions were, using two pieces implant might be preferable that it showed less stresses on cement and cortical bone. No wary from implant failure for both implant designs under the applied loads. Crown received less stresses with one piece implant in comparison to two pieces one.

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Ahram Canadian Dental Journal
Volume 4, Issue 2
April 2025
Pages 123-133

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