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A Digital Image Correlation Analysis of Strain Generated by 3-Unit Implant-Supported Fixed Dental Prosthesis: An In
Raniel F Peixoto1, Ana P Macedo, Janisse Martinelli
1*Professor, Prosthodontic Department, Arcoverde School of Dentistry, University of Pernambuco, Arcoverde, Brazil. †Laboratory Technician, Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo, Ribeirao Preto, Brazil. ‡Professor, Prosthodontic Department, Federal University of Triângulo Mineiro, Uberaba, Brazil. §Professor, Department of Prosthodontics (MOT), School of Dentistry, Fluminense Federal University, Niterói, Brazil. ¶Professor, Department of Dental Materials and Prosthodontics, Ribeirao Preto School of Dentistry, University of Sao Paulo, Ribeirao Preto, Brazil.
Objective:
To evaluate the influence of different veneering materials (porcelain and resin) and implants (short and conventional) in the strain distribution of implant-supported splinted fixed partial dentures (FPDs) using digital image correlation (DIC).
Material And Methods:
Four polyurethane models were fabricated with resin replicas (first premolar) and short and/or conventional implants replacing the second premolar and first and second molars, according to the following configurations: G1, 2 conventional (second premolar and first molar) and 1 short (second molar) implant; G2, 1 conventional (second premolar) and 2 short (first and second molar) implants; G3, 3 short implants; G4, 3 conventional implants. Porcelain- and resin-veneered splinted FPDs were screwed to the implant abutments. The DIC system was used to calculate strains during application of occlusal load (250 N).
Results:
Porcelain- and resin-veneered showed similar strain distribution for all groups (P > 0.05). Concentration of compressive strains was higher in G3P and G3R with maximum compressive strains of -1271.50 and -1026.88 μs, respectively. G4 transferred the best strain distribution (porcelain, -275.14 μs; resin, -254.44 μs), followed by G2 (porcelain, -306.79 μs; resin, -310.63 μs).
Conclusion:
The veneering material used did not influence the strain distribution. In addition, conventional implants generate less strain concentration, although the combination of 2 short and 1 conventional implant seems to be a viable plan.
