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Published on: February 10, 2014
Effect of internal wall inclination of Morse taper implants on peri-implant stress distribution: A photoelastic
Taynara Beatriz Corte1, Ana Julia Perosso Granado1, Luana Gonçalves Menechelli2
1Department of Prosthodontics, Presidente Prudente Dental School, University of Western São Paulo - UNOESTE, Presidente Prudente, Brazil.
Purpose:
This study aimed to evaluate the effect of internal wall inclination of Morse taper dental implants on the stress distribution on the peri-implant area, using the photoelasticity method.
Materials And Methods:
The analysis of stress was performed in three groups (EH: External Hexagon, MT: Morse Taper, GM: Grand Morse), dividing the photoelastic models between implants with external (HE) and internal (MT and GM) connections. Two different inclinations of the internal walls were assessed for implants with internal connection: MT: 11.5° and Grand Morse: 16°. The implant-supported prostheses were submitted to 100 N axial and oblique loads within the photoelastic models. The qualitative analysis was performed by describing the fringes formed in the photoelastic block. The quantitative analysis of the stresses was performed using the table recommended by the ASTM D4093-95 standard, which relates the colors of the isochromatic fringes to the numerical stress values.
Results:
The results showed that the HE had a greater concentration of stresses in the apical region, while the implants with internal connections (MT and GM) showed a similar biomechanical pattern of stress distribution, regardless of the inclination of the internal walls.
Conclusions:
Increasing the internal wall inclination from 11.5° to 16° did not yield any additional biomechanical advantages in implant-supported rehabilitation.
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