title: Three-Dimensional Finite Element Analysis Surface Stress Distribution on Regular and Short Morse Taper Implants Generated by Splinted and Nonsplinted Prostheses in the Rehabilitation of Various Bony Ridges.
abstract: OBJECTIVE
  This study used finite element analysis to compare the biomechanical performance of splinted (SP) and nonsplinted (NSP) prostheses to regular and short length Morse taper implants in the posterior side of the mandible.
  
  
  METHODS
  The authors used 3-dimensional geometric models of regular implants (∅4 × 11 mm) and short implants (∅4 × 5 mm) housed in the corresponding bone edges of the posterior left mandibular hemiarch involving tooth 34. The 8 experimental groups were: the control group SP (3 regular implants rehabilitated with SP), group 1SP (2 regular and 1 short implants rehabilitated with SP), group 2SP (1 regular and 2 short implants rehabilitated with SP), group 3SP (3 short implants rehabilitated with SP), the control group NSP (3 regular implants rehabilitated with NSP), group 1NSP (2 and 1 short implants rehabilitated with NSP), group 2NSP (1 regular and 2 short implants rehabilitated with NSP), and group 3NSP (3 short implants rehabilitated with NSP). Oblique forces were simulated in the molars (365 N) and premolars (200 N). Qualitative and quantitative analysis of the distribution of Von Mises equivalent stress (implants, components, and infrastructure) was performed using the AnsysWorkbench10.0 software.
  
  
  CONCLUSIONS
  The results showed that the use of SP provides several advantages and benefits, reducing the stresses placed on the implant surface, on the transmucosal abutment areas and on the interior region of the infrastructure. The use of NSP was advantageous in reducing the stresses on the abutments and in the distal interproximal area of connection between the crowns.
authors.affiliation: Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto-University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Marcelo Bighetti
authors.initials: MB
authors.lastname: Toniollo
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Macedo
authors.forename: Denise
authors.initials: D
authors.lastname: Pupim
authors.forename: Danilo
authors.initials: D
authors.lastname: Zaparolli
authors.forename: Maria da Gloria Chiarello
authors.initials: Mda G
authors.lastname: de Mattos
mesh_terms: D001696:Biomechanical Phenomena; D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008334:Mandible / Q000502:physiology / Q000601:surgery; D003765:Models, Dental; D013165:Splints; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants