Comparison of implant body designs and threaded designs of dental implants: a 3-dimensional finite element analysis.
OBJECTIVE
Stress analysis was performed for various implant designs using 3-dimensional finite element analysis approaches.


METHODS
Six implant designs were included: 3 parallel-sided implants (no thread, triangular thread, and squared thread), 2 stepped configurations (non-thread and triangular thread), and a tapered body of implant with squared thread. All threads had spiral characteristics. The mandibular model was constructed from computed tomographic (CT) images of a human mandible, and the material properties were anisotropic (different in different directions). A 100-N oblique force was applied at a 45-degree angle to the long axis of the implants at the buccal cusp as the loading condition.


RESULTS
Compared with cylindric implants, threaded implants (either triangular or squared) demonstrated increased peak stress at the crestal bone. The bone stress of stepped implants was decreased in the cortical region but was increased in the trabecular region. However, both threaded and stepped designs showed decreased interfacial stresses of bone near the valleys of the threaded and stepped areas. The tapered design decreased stresses by up to 32% in the cortical region and 17% in the trabecular region.


CONCLUSIONS
Although threaded implants could not decrease the peak stress at the crestal bone, both threaded and stepped designs show an ability to dissipate the interfacial stresses of bone. The use of tapered implants could reduce peak stress in both cortical and trabecular bone.
Huang
Heng-Li
HL
School of Dentistry, China Medical University, Taichung, Taiwan.
Chang
Chin-Han
CH
Hsu
Jui-Ting
JT
Fallgatter
Alison M
AM
Ko
Ching-Chang
CC
D001696:Biomechanical Phenomena; D003198:Computer Simulation; D015921:Dental Implants; D017267:Dental Prosthesis Design; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008334:Mandible / Q000033:anatomy & histology / Q000502:physiology; D008422:Materials Testing; D008954:Models, Biological; D013314:Stress, Mechanical; D013499:Surface Properties
D015921:Dental Implants