Effect of thread depth and implant shape on stress distribution in anterior and posterior regions of mandible bone: A finite element analysis

Falah A. Hussein, Kareem N. Salloomi, Besaran Y. Abdulrahman, Abdulsalam R. Al‑Zahawi, Laith A. Sabri


Background: The ability of modern implant dentistry to achieve goals such as normal contour,
function, comfort, esthetics, and health to totally or partially edentulous patients guaranteed it to
be more effective and reliable method for the rehabilitation process of many challenging clinical
situations. In regard to this, the current study evaluates the effect of changing implant shape design
parameters on interface stress distribution within the mandible bone.
Materials and Methods: A numerical procedure based on finite element (FE) method was adopted
to investigate the influence of using different body design and thread depth of the inserted implant
on the final stress situation. For the purpose of evaluation, a three‑dimensional realistic FE models
of mandible bone and inserted implant were constructed and analyzed using a pack of engineering
software (Solidworks, and ANSYS). Six different commercial implant models (cylindrical and tapered)
with three different V‑shaped thread depths (0.25 mm, 0.35 mm, and 0.45 mm) were designed to
be used in this study. The suggested implants used in this study were threaded in two different
locations of mandible bone; the anterior region (Type I model) and posterior region (Type II model).
A vertical static load of 250 N was directly applied to the center of the suprastructure of the
implant for each model.
Results: For both models, evaluations were achieved to figure out the stress distribution
patterns and maximum equivalent von Mises. The results obtained after implementation of FE
dental‑implant models show that the highest stresses were located at the crestal cortical bone
around the implant neck. In addition, the simulation study revealed that taper body implant had
a higher peak value of von Mises stress than that of cylinder body implants in all types of bones.
Moreover, a thread depth of 0.25 mm showed highest peak of maximum von Mises stresses for
Type I and Type II models.
Conclusion: The simulation results indicate that all models have the same von Mises stress
distribution pattern and higher peak von Mises stresses of the cortical bone were seen in tapered
implant body in contrast to the cylindrical body.
Key Word: Dental Implant‑Abutment Design, finite element analysis, mandible, stress

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