Alveolar bone stress around implants with different abutment angulation

TY - JOUR

T1 - Alveolar bone stress around implants with different abutment angulation

T2 - an FE-analysis of anterior maxilla

AU - Sadrimanesh, Roozbeh

AU - Siadat, Hakimeh

AU - Sadr-Eshkevari, Pooyan

AU - Monzavi, Abbas

AU - Maurer, Peter

AU - Rashad, Ashkan

PY - 2012/6

Y1 - 2012/6

N2 - 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.

AB - 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.

KW - Alveolar Process

KW - Biomechanical Phenomena

KW - Bite Force

KW - Compressive Strength

KW - Computer Simulation

KW - Dental Abutments

KW - Dental Implant-Abutment Design

KW - Dental Implantation, Endosseous

KW - Dental Implants

KW - Dental Stress Analysis

KW - Elasticity

KW - Finite Element Analysis

KW - Humans

KW - Maxilla

KW - Radiography

KW - Tensile Strength

KW - Comparative Study

KW - Journal Article

KW - Research Support, Non-U.S. Gov't

U2 - 10.1097/ID.0b013e31824c302e

DO - 10.1097/ID.0b013e31824c302e

M3 - SCORING: Journal article

C2 - 22513498

VL - 21

SP - 196

EP - 201

JO - IMPLANT DENT

JF - IMPLANT DENT

SN - 1056-6163

IS - 3

ER -