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Alveolar bone stress around implants with different abutment angulation: an FE-analysis of anterior maxilla
Roozbeh Sadrimanesh1, Hakimeh Siadat, Pooyan Sadr-Eshkevari
1Department of Oral and Maxillofacial Prosthodontics and Implants, Tehran University of Medical Sciences (TUMS), School of Dental Medicine, Tehran, Iran.
Objectives:
To comparatively assess the masticatory stress distribution in bone around implants placed in the anterior maxilla with three different labial inclinations.
Materials And Methods:
Three-dimensional finite element models were fabricated for three situations in anterior maxilla: (1) a fixture in contact with buccal cortical plate restored by straight abutment, (2) a fixture inclined at 15 degrees, and (3) 20 degrees labially restored with corresponding angled abutment. A palatal bite force of 146 N was applied to a point 3 mm below the incisal edge. Stress distribution around the bone-fixture interface was determined using ANSYS software.
Results:
The maximum compressive stress, concentrated in the labial crestal cortical bone, was measured to be 62, 108, and 122 MPa for 0-, 15-, and 20-degree labially inclined fixtures, respectively. The maximum tensile stress, concentrated in the palatal crestal cortical bone, was measured to be 60, 108, and 120 MPa for 0-, 15-, and 20-degree labially inclined fixtures, respectively.
Conclusions:
While all compressive stress values were under the cortical yield strength of 169 MPa, tensile stress values partially surpassed the yield strength (104 MPa) especially when a 20-degree inclination was followed for fixture placement.
