using computer aided designing in abacus software

1. CAD
MMST2015
Submission of project

2. Presenter
Shiladitya Paul
15MM60005
mmst 1st sem.
School of medical science & techn.
iit kgp

3. Under guidance of
Prof, Arghya Deb
Ph.D.(Princeton Univ)
Associate Professor, Civil Engineering
Co-Prof-in-Charge, Centre for Railway
Research, Civil Engineering,
IIT KGP

4. Project Title
•Finite Element Analysis of Dental
Implant Using Abaqus Software

5. What is A Dental Implant?
• Development of an ideal substitute for missing
teeth has been one of the long-term aims of
dentistry. A dental implant is a biocompatible
screw-like titanium ‘fixture’ that is surgically
placed into the jawbone.
• An implant post or abutment and permanent
tooth can be attached in a variety of designs.

6. What is the Benefit?
• The long-term benefits of dental implants include
improved appearance, comfort, speech and self-
esteem.
• With the dental implant, the patient can eat more
conveniently .
• embarrassment caused by removable partial and
full dentures can be eliminated. In addition the
implant is
• able to protect the remaining natural teeth, stop
bone loss and restore facial skeletal structure

7. Overview of some available
commercial short and mini implants

8. What is FEA?
• Finite element analysis (FEA) is a
computerized method for predicting how a
product reacts to real-world forces, vibration,
heat, fluid flow, and other physical effects.
• Finite element analysis shows whether a
product will break, wear out, or work the way
it was designed. It is called analysis, but in the
product development process, it is used to
predict what is going to happen when the
product is used.

9. What is ABAQUS?
• Abaqus FEA (formerly ABAQUS) is a software
suite for finite element analysis and
computer-aided engineering, originally
released in 1978. The name and logo of this
software are based on the abacus calculation
tool. The Abaqus product suite consists of five
core software products:

10. .
• Abaqus/CAE, or "Complete Abaqus Environment" (a backronym with
an obvious root in Computer-Aided Engineering). It is a software
application used for both the modeling and analysis of mechanical
components and assemblies (pre-processing) and visualizing the finite
element analysis result. A subset of Abaqus/CAE including only the
post-processing module can be launched independently in the
Abaqus/Viewer product.
• Abaqus/Standard, a general-purpose Finite-Element analyzer that
employs implicit integration scheme (traditional).
• Abaqus/Explicit, a special-purpose Finite-Element analyzer that
employs explicit integration scheme to solve highly nonlinear systems
with many complex contacts under transient loads.
• Abaqus/CFD, a Computational Fluid Dynamics software application
which provides advanced computational fluid dynamics capabilities
with extensive support for preprocessing and postprocessing
provided in Abaqus/CAE.
• Abaqus/Electromagnetic, a Computational electromagnetics software
application which solves advanced computational electromagnetic
problems.

11. Samples

12. Human Body Parts

13. dental implant types

14. .

15. Osteoplant Dental Implant

16. Steps of Dental Implant Surgery
Missing molar in the mandible, to be treated with a dental implant-supported restoration

17. .
After flap elevation, the cortical bone is visible

18. Dental implant with an abutment to be placed in the ridge created by the missing
molar

19. Implant is placed in the ridge

20. Occlusal view of the implant after 2 months of
healing

21. Abutment is prepared and attached to the implant

22. Porcelain-fused metal implant-supported
restoration in use with optimum treatment
planning

23. Abaqus Analysis
2D or 3D?
• The 3D model of the
implant will contain
>50000 dof.
• So we were supposed to
use 2D model using
axisymmetric solid CAXA
model.
• But that facillity was not
in Abaqus which we
were using.
• So, we have used
CAX4R.

24. Parts• PARTS
• A Abutment
• S screw
• CC Cortical
Bone
• CB Cancellous
Bone
.

25. Mechanism
• A dental implant resembles a screw
constructed from titanium and is surgically
placed into the bone to serve as the new root
. Once the implant successfully fuses with the
bone, an abutment is placed on top of the
implant to serve as the platform that
protrudes out of the gums, and the implant
crown can then be seated on the abutment
permanently

26. Cortical
Bone
CoOrdinates
(0,0)
(0,5)
(6.25,0)
(7.5,0)
(0,0)

27. Cancellous
Bone
CoOrdinates
(0,5)
(0,10)
(2.5,10)
(2.5,15)
(5,15)
(6.25,15)
(0,5)
Axisymmetrics
hell

28. Screw
CoOrdinates
(0,10)
(0,20)
(2.5,20)
(1.5,20)
(1.5,10.1)
(0,10.1)
Axi
Symmetric
shell

29. Abutment
C0Ords
(2.5,15)
(2.5,2.5)
(3.5,2.5)
(5,20)
(3.75,18.5)
(3.75,15)
(2.5,15)
Axi Symm
Shell

30. Materials Property
PART Young’s Modulus Poisson’s Ratio
Cortical Bone 13xE9 0.3
Cancelleous Bone 95x E8 0.25
Screw(Titanium) 105xE9 0.32
Abutment(Zirconium) 105xE9 0.3

31. What is Young’s modulus?

32. Poisson Ratio

33. Assembly

34. Interaction

35. I Interaction zoom

36. Step

37. Boundary Condition

38. Load

39. Load
Name Vertical
Step Static General
Type Pressure
Region Vertical
Distribution Uniform
Magnitude 600
Name Horizontal
Step Static General
Type Pressure
Region Horizontal
Distribution Uniform
Magnitude 100

40. Mesh
0.3 0.2 0.1 0.05

41. Mesh
Central Quad
Element Standard Linear
Family Axisymmetric Stress

42. Results 0.3 mess

46. Mesh size 0.2

48. Mesh 0.1

50. Mesh 0.05

52. Analysis
• What is S Mises?
• Von Mises stress
• .Using this information an engineer can say his
design will fail, if the maximum value of Von
Mises stress induced in the material is more
than strength of the material.
• The concept of Von mises stress arises from
the distortion energy failure theory.

53. .

55. S Max Principal
• Maximum Principle Stress Theory - According
to this theory failure will occur when the
maximum principal stress in a system reaches
the value of the maximum stress at elastic
limit in simple tension. This theory is
approximately correct for cast iron and brittle
materials generally.

56. Variation of position of S max & S
mises with respect to mesh size
Mesh Size 0.3 0.2 0.1 0.05
S Max
position
Medial
lower
corner of
screw
Medial
lower
corner of
screw
Medial
lower
corner of
abutment
Lateral
lower
corner of
screw
S Mises
position
Lateral
lower
corner of
screw
Lateral
lower
corner of
screw
Lateral
lower
corner of
screw
Lateral
lower
corner of
screw

57. Variation of values of S max & S mises
with respect to mesh size
Mesh Size 0.3 0.2 0.1 0.05
S Max
value
+2.54xE2 +1.983xE2 +2.347xE2 +3.193xE2
S Mises
Value
+1.721xE3 +2.11xE3 +2.336xE3 +2.938xE3

58. Conclusion
• Considering the above s mises and max
principal value which have been plotted at the
same site shows that maximum stress will
occur lateral lower corner of screw and will
lead to all related complication
• Though in comparison with the paper it says
no serious stress fracture was found.

59. Complications: Broken Implant
Intraoral picture of a broken implant due to excessive loading after 1 year of use

60. Advantages of FEA study
• FEA studies have several advantages over
clinical, pre-clinical, and in vitro studies.
• Patients will not be harmed by the application
of new materials and treatment modalities
that have not been previously tested.
• Animals will not suffer from these
biomechanical studies.

61. Disadvantages of FEA study
• All of these applications are being performed
on a computer, with critical limitations and
assumptions that will clearly affect the
applicability of the results to a real scenario.
• Simplifications are made for all simulated
models; therefore, the models should be
compared with each other within the same
study.

62. Summary
• FEA is a numerical stress analysis technique and is
extensively used in implant dentistry to evaluate the
risk factors from a biomechanical point of view.
• Simplifications and assumptions are the limitations of
FEA studies.
• Although advanced computer technology is used to
obtain results from simulated models, many factors
affecting clinical features such as implant macro and
micro design, material properties, loading conditions,
and boundary conditions are neglected or ignored.
Therefore, correlating FEA results with preclinical and
long-term clinical studies may help to validate research
models

63. Acknowledgements
• Prof A.DEB , Associate Professor, Civil
Engineering, IIT KGP
• Other members of Project Group
• Stuff members of CAD Lab
• IIT KGP free broadband service

64. .