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Pellizzer, Eduardo Piza DDS, MSc, PhD*; Falcón-Antenucci, Rosse Mary DDS, MSc; de Carvalho, Paulo Sérgio Perri DDS, MSc, PhD†; Sánchez, Daniela Mayumi Inatomi Kavano DDS; Rinaldi, Gabriel Augusto Tozo DDS; de Aguirre, Carolina Calles DDS; Goiato, Marcelo Coelho DDS, MSc, PhD*
The aim of this study was to perform a photoelastic analysis of stress distribution on straight and angulated implants with different crowns (screwed and cemented). Three models were made of photoelastic resin PL-2: model 1: external hexagon implant 3.75 × 10.00 mm at 0 degrees; model 2: external hexagon implant 3.75 × 10.00 mm at 17 degrees; model 3: external hexagon implant 3.75 × 10.00 mm at 30 degrees. Axial and oblique (45 degrees) load (100 N) was applied with a universal testing machine. The photoelastic fringes on the models were recorded with a digital camera and visualized in a graphic software for qualitative analysis. The axial loading generated the same pattern of stress distribution. The highest stresses were concentrated between medium and apical thirds. The oblique loading generated a similar pattern of stress distribution in the models with similar implant angulation; the highest stress was located on the cervical region opposite to implant angulation and on the apical third. It was concluded that the higher the implant angulation, the higher the stress value, independent of crown type. The screwed prostheses exhibited the highest stress concentration. The oblique load generated higher stress value and concentration than the axial load.
© 2011 Mutaz B. Habal, MD
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Dental implant, implant angulation, cement retention, screw retention, photoelasticity, biomechanics
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