Secondary Logo

Journal Logo

Institutional members access full text with Ovid®

Alveolar Bone Stress Around Implants With Different Abutment Angulation: An FE-Analysis of Anterior Maxilla

Sadrimanesh, Roozbeh DDS*; Siadat, Hakimeh DDS, MS; Sadr-Eshkevari, Pooyan DDS; Monzavi, Abbas DDS, MS§; Maurer, Peter DDS, MD, PhD; Rashad, Ashkan DDS

doi: 10.1097/ID.0b013e31824c302e
Basic and Clinical Research
Buy

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.

*Prosthodontist, Private Practice, Tehran, Iran.

Associate Professor, Department of Oral and Maxillofacial Prosthodontics and Implants, Tehran University of Medical Sciences (TUMS), School of Dental Medicine, Tehran, Iran.

Director of the Dental Section, Farzan Clinical Research Institute, Tehran, Iran.

§Associate Professor, Department of Oral and Maxillofacial Prosthodontics and Implants, Tehran University of Medical Sciences (TUMS), School of Dental Medicine, Tehran, Iran.

Chair, Department of Oral and Maxillofacial Surgery, Bremerhaven Hospital (Reinkenheide), Bremerhaven, Germany.

Resident, Department of Oral and Maxillofacial Surgery, Bremerhaven Hospital (Reinkenheide), Bremerhaven, Germany.

Reprint requests and correspondence to: Ashkan Rashad, DDS, Department of Oral & Maxillofacial Surgery, Bremerhaven Reinkenheide Hospital, Postbrookstraße 103, 27574 Bremerhaven, Germany, Phone: 0049.177.8562393, Fax: 0049.471.299.3318, E-mail: dr.arashad@yahoo.com

© 2012 Lippincott Williams & Wilkins, Inc.