Nonlinear stress analysis of titanium implants by finite element method.
With use of dental implants on the rise, there is also a tandem increase in the number of implant fracture reports. To the end of investigating the stress occurring in implants, elasticity and plasticity analyses were performed using the finite element method. The following results were obtained: (1) With one-piece type of implants of 3.3 mm diameter, elasticity analysis showed that after applying 500 N in a 45-degree direction, stress exceeding 500 MPa which is the proof stress of grade 4 pure titanium - occurred. This suggested the possibility of fatigue destruction due to abnormal occlusal force, such as during bruxism. (2) With two-piece type of implants that can tolerate vertical loading of 5,000 N, plasticity analysis suggested the possibility of screw area fracture after applying 500 N in a 45-degree direction. (3) On the combined use of an abutment and a fixture from different manufacturers, fracture destruction of even Ti-6Al-4V, which has a high degree of strength, was predicted.
Nagasawa
Sakae
S
Department of Dental Materials, Matsumoto Dental University, Hirooka Shiojiri, Nagano 399-0781, Japan. snagasawa@po.mdu.ac.jp
Hayano
Keigo
K
Niino
Tooru
T
Yamakura
Kazunori
K
Yoshida
Takamitsu
T
Mizoguchi
Toshihide
T
Terashima
Nobuyosi
N
Tamura
Kaoru
K
Ito
Michio
M
Yagasaki
Hiroshi
H
Kubota
Osamu
O
Yoshimura
Masayuki
M
D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000379:methods*; D004548:Elasticity; D020342:Finite Element Analysis; D018583:Pliability; D013718:Tensile Strength; D014025:Titanium
D015921:Dental Implants; D014025:Titanium