Influence of Flat Occlusal Splint on Stresses Induced on Implants for Different Fixed Prosthetic Systems

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  • Mirelle N. Henrique
  • Ricardo A. Caldas
  • Kusai Baroudi
  • Marina Amaral
  • Rafael P. Vitti
  • Lais R. Silva-ConcĂ­lio



Finite Element Analysis
Implant Prosthesis
Stress Concentration
Occlusal Splints

Objective: The flat occlusal plate has been recommended to reduce stress concentration in implant prosthesis treatments. The purpose was to investigate the influence of the occlusal splint on three-element implant-supported fixed prosthesis. Materials and Methods: A three-dimensional virtual model was created consisting of a cortical and spongy bone block simulating the region from first premolar to the maxillary first molar using two HE or MT implants (4 x 11mm) with Ti and/or Y-TZP abutments. The second premolar was the pontic of the prosthesis. The three-element fixed prosthesis with a zirconia infrastructure and Y-TZP coating were cemented, in addition to using a flat occlusal splint made of acrylic resin in the region. Combined axial and oblique loads of 100N and 300N were applied. Results: The tensile stresses on MT implant bone tissue produced values of 4-19% lower than those of HE implants. The lowest differences were
observed for oblique loading with an occlusal splint, with a 4% (Ti-Y-TZP) and 9% (Ti-Ti) decrease. When the compressive stresses were evaluated, HE implants produced lower values than MT implants. Conclusion: A significant increase was observed in the oblique loading stresses in the absence of occlusal splints, regardless of the applied load.