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OUTLIN
E• The FEA of the 3.5 mm Bicon Implant-Abutment-
Bone system under central occlusal loads
• Mechanics of the Tapered Interference Fit in a 3.5
mm Bicon Implant
INDIAN DENTAL ACADEMY
Leader in continuing Dental Education
www.indiandentalacademy.com
WHAT IS A DENTAL IMPLANT?
 Dental implant is an artificial titanium fixture
(similar to those used in orthopedics)
which is placed surgically into the jaw bone to
substitute for a missing tooth and its root(s).
www.indiandentalacademy.com
Surgical Procedure
STEP 1: INITIAL SURGERY
STEP 2: OSSEOINTEGRATION PERIOD
STEP 3: ABUTMENT CONNECTION
STEP 4: FINAL PROSTHETIC RESTORATION
Success Rates
lower jaw, front – 90 – 95%
lower jaw, back – 85 – 90%
upper jaw, front – 85 – 95%
upper jaw, back – 65 – 85%www.indiandentalacademy.com
History of Dental Implants
In 1952, Professor Per-Ingvar Branemark,
a Swedish surgeon, while conducting research
into the healing patterns of bone tissue,
accidentally discovered that when pure titanium
comes into direct contact with the living bone
tissue, the two literally grow together to form a
permanent biological adhesion. He named this
phenomenon "osseointegration".
www.indiandentalacademy.com
First Implant Design by Branemark
All the implant designs are obtained by the
modification of existing designs.
John Brunski
www.indiandentalacademy.com
ComparisonofImplantSystems
Astra Tech.
ITI
Bicon
www.indiandentalacademy.com
OUTLINE
• The FEA of the 3.5 mm Bicon Implant-Abutment-
Bone system under central occlusal loads
• Mechanics of the Tapered Interference Fit in a 3.5
mm Bicon Implant
www.indiandentalacademy.com
The FEA of the 3.5 mm Bicon
Implant-Abutment-Bone system under
central occlusal loads
Assumptions:
• Analyses were linear, static and assumed that materials
were elastic, isotropic and homogenous.
• 100% osseointegration is assumed between bone and
implant. Bone and implant are assumed to be perfectly
bonded.
• The stresses in the bone due to the interference fit between
implant and abutment is assumed to be relaxed after the
insertion of the abutment.www.indiandentalacademy.com
Finite Element Model
 29117 Solid 45 Brick Elements (32000 limit)
 Symmetry boundary conditions on two cross-sections
and fixed in all dofs from the bottom of the bone.
V
H
www.indiandentalacademy.com
RESULTS
 Effect of bone’s elastic modulus on the overall
stress distribution: Different finite element analyses
are run by varying bone mechanical properties
surrounding the implant. (1-16 GPa)
The properties of the bone depends on the location in
the jaw, the gender and age of the patient.
www.indiandentalacademy.com
 Force: Vertical 100 N
 Bone Modulus: 16 GPa
 Force: Vertical 100 N
 Bone Modulus: 1 GPa
 Force: Lateral 20 N
 Bone Modulus: 16 GPa
 Force: Lateral 20 N
 Bone Modulus: 1 GPa
www.indiandentalacademy.com
• Both the stress distribution and the stress levels
are effected significantly as the bone modulus is
varied.
• CT scan data may be a good source for obtaining
patient dependent implant designs.
www.indiandentalacademy.com
 Maximum vertical and lateral load carrying capacity of
the bone:
The failure limit of the bone due to fatigue is 29 MPa.
[Evans et al.]
 Force: Vertical 920 N
 Bone Modulus: 10 GPa
 Force: Lateral 40 N
 Bone Modulus: 10 GPa
Lateral loads cause approximately 25 times higher
stresses in the bone than the vertical loads.www.indiandentalacademy.com
OUTLINE
• The FEA of the 3.5 mm Bicon Implant-Abutment-
Bone system under central occlusal loads
• Mechanics of the Tapered Interference Fit in a 3.5
mm Bicon Implant
www.indiandentalacademy.com
Mechanics of the Tapered Interference Fit
in a 3.5 mm Bicon Implant
 Perfectly elastic large displacement non-linear contact
finite element analysis for different insertion depths.
 Elastic-plastic large displacement non-linear contact
finite element analysis for different insertion depths.
www.indiandentalacademy.com
 Different implant-abutment assemblies are performed
for 0.002”, 0.004”, 0.006”, 0.008” and 0.010” insertion
depths.
 Axisymmetric model is used.
 100% osseointegration is assumed between bone and
implant. Bone and implant are assumed to be perfectly
bonded.
 Bone is assumed to be elastic, isotropic and homogenous
with a Young’s modulus of 10 GPa.
Finite Element Model
www.indiandentalacademy.com
Perfectly elastic large displacement non-linear
contact finite element analysis for different
insertion depths.
Perfectly Elastic Finite Element Results
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
500000
0.47 0.49 0.51 0.53 0.55 0.57 0.59
Vertical Position
ContactPressure(P)psi
Interference depth: 0.002 in
Interference depth: 0.004 in
Interference depth: 0.006 in
 Contact pressure increases linearly with insertion
depth.
www.indiandentalacademy.com
After 0.004” insertion depth, it is seen that plastic
deformation occurs in the implant.
An elastic-plastic model is needed.
Yield Strength of Ti-6Al-4V 139,236 Psiwww.indiandentalacademy.com
Elastic-plastic large displacement non-linear
contact finite element analysis for different
insertion depths
Stress
(MPA)
% Strain
Bilinear Isotropic Hardening Model
www.indiandentalacademy.com
Contact Pressure Distribution for Different
Insertion Depths
Elastic-Plastic Finite Element Results
0
50000
100000
150000
200000
250000
300000
0.45 0.47 0.49 0.51 0.53 0.55 0.57 0.59
Vertical Position
ContactPressure(P)psi
Interference depth: 0.004 in
Interference depth: 0.006 in
Interference depth: 0.008 in
Interference depth: 0.010 in
 Contact pressure increases non-linearly with larger
insertion depths.
www.indiandentalacademy.com
VonMisesStressDistributionintheImplant
Yield Strength of Ti-6Al-4V 139,236 Psi
www.indiandentalacademy.com
VonMisesStressDistributionintheBone
Yield Strength of Bone 8,702 Psi
www.indiandentalacademy.com
FUTURE WORK
 Comparison of different implant designs in
terms of stress distribution in the bone due to
occlusal loads.
 Modeling non-homogenous bone material
properties by incorporating with CT scan data.
 Comparison of different implant-abutment
interfaces
www.indiandentalacademy.com

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Dental implant/ oral surgery courses  

  • 1. OUTLIN E• The FEA of the 3.5 mm Bicon Implant-Abutment- Bone system under central occlusal loads • Mechanics of the Tapered Interference Fit in a 3.5 mm Bicon Implant INDIAN DENTAL ACADEMY Leader in continuing Dental Education www.indiandentalacademy.com
  • 2. WHAT IS A DENTAL IMPLANT?  Dental implant is an artificial titanium fixture (similar to those used in orthopedics) which is placed surgically into the jaw bone to substitute for a missing tooth and its root(s). www.indiandentalacademy.com
  • 3. Surgical Procedure STEP 1: INITIAL SURGERY STEP 2: OSSEOINTEGRATION PERIOD STEP 3: ABUTMENT CONNECTION STEP 4: FINAL PROSTHETIC RESTORATION Success Rates lower jaw, front – 90 – 95% lower jaw, back – 85 – 90% upper jaw, front – 85 – 95% upper jaw, back – 65 – 85%www.indiandentalacademy.com
  • 4. History of Dental Implants In 1952, Professor Per-Ingvar Branemark, a Swedish surgeon, while conducting research into the healing patterns of bone tissue, accidentally discovered that when pure titanium comes into direct contact with the living bone tissue, the two literally grow together to form a permanent biological adhesion. He named this phenomenon "osseointegration". www.indiandentalacademy.com
  • 5. First Implant Design by Branemark All the implant designs are obtained by the modification of existing designs. John Brunski www.indiandentalacademy.com
  • 7. OUTLINE • The FEA of the 3.5 mm Bicon Implant-Abutment- Bone system under central occlusal loads • Mechanics of the Tapered Interference Fit in a 3.5 mm Bicon Implant www.indiandentalacademy.com
  • 8. The FEA of the 3.5 mm Bicon Implant-Abutment-Bone system under central occlusal loads Assumptions: • Analyses were linear, static and assumed that materials were elastic, isotropic and homogenous. • 100% osseointegration is assumed between bone and implant. Bone and implant are assumed to be perfectly bonded. • The stresses in the bone due to the interference fit between implant and abutment is assumed to be relaxed after the insertion of the abutment.www.indiandentalacademy.com
  • 9. Finite Element Model  29117 Solid 45 Brick Elements (32000 limit)  Symmetry boundary conditions on two cross-sections and fixed in all dofs from the bottom of the bone. V H www.indiandentalacademy.com
  • 10. RESULTS  Effect of bone’s elastic modulus on the overall stress distribution: Different finite element analyses are run by varying bone mechanical properties surrounding the implant. (1-16 GPa) The properties of the bone depends on the location in the jaw, the gender and age of the patient. www.indiandentalacademy.com
  • 11.  Force: Vertical 100 N  Bone Modulus: 16 GPa  Force: Vertical 100 N  Bone Modulus: 1 GPa  Force: Lateral 20 N  Bone Modulus: 16 GPa  Force: Lateral 20 N  Bone Modulus: 1 GPa www.indiandentalacademy.com
  • 12. • Both the stress distribution and the stress levels are effected significantly as the bone modulus is varied. • CT scan data may be a good source for obtaining patient dependent implant designs. www.indiandentalacademy.com
  • 13.  Maximum vertical and lateral load carrying capacity of the bone: The failure limit of the bone due to fatigue is 29 MPa. [Evans et al.]  Force: Vertical 920 N  Bone Modulus: 10 GPa  Force: Lateral 40 N  Bone Modulus: 10 GPa Lateral loads cause approximately 25 times higher stresses in the bone than the vertical loads.www.indiandentalacademy.com
  • 14. OUTLINE • The FEA of the 3.5 mm Bicon Implant-Abutment- Bone system under central occlusal loads • Mechanics of the Tapered Interference Fit in a 3.5 mm Bicon Implant www.indiandentalacademy.com
  • 15. Mechanics of the Tapered Interference Fit in a 3.5 mm Bicon Implant  Perfectly elastic large displacement non-linear contact finite element analysis for different insertion depths.  Elastic-plastic large displacement non-linear contact finite element analysis for different insertion depths. www.indiandentalacademy.com
  • 16.  Different implant-abutment assemblies are performed for 0.002”, 0.004”, 0.006”, 0.008” and 0.010” insertion depths.  Axisymmetric model is used.  100% osseointegration is assumed between bone and implant. Bone and implant are assumed to be perfectly bonded.  Bone is assumed to be elastic, isotropic and homogenous with a Young’s modulus of 10 GPa. Finite Element Model www.indiandentalacademy.com
  • 17. Perfectly elastic large displacement non-linear contact finite element analysis for different insertion depths. Perfectly Elastic Finite Element Results 0 50000 100000 150000 200000 250000 300000 350000 400000 450000 500000 0.47 0.49 0.51 0.53 0.55 0.57 0.59 Vertical Position ContactPressure(P)psi Interference depth: 0.002 in Interference depth: 0.004 in Interference depth: 0.006 in  Contact pressure increases linearly with insertion depth. www.indiandentalacademy.com
  • 18. After 0.004” insertion depth, it is seen that plastic deformation occurs in the implant. An elastic-plastic model is needed. Yield Strength of Ti-6Al-4V 139,236 Psiwww.indiandentalacademy.com
  • 19. Elastic-plastic large displacement non-linear contact finite element analysis for different insertion depths Stress (MPA) % Strain Bilinear Isotropic Hardening Model www.indiandentalacademy.com
  • 20. Contact Pressure Distribution for Different Insertion Depths Elastic-Plastic Finite Element Results 0 50000 100000 150000 200000 250000 300000 0.45 0.47 0.49 0.51 0.53 0.55 0.57 0.59 Vertical Position ContactPressure(P)psi Interference depth: 0.004 in Interference depth: 0.006 in Interference depth: 0.008 in Interference depth: 0.010 in  Contact pressure increases non-linearly with larger insertion depths. www.indiandentalacademy.com
  • 21. VonMisesStressDistributionintheImplant Yield Strength of Ti-6Al-4V 139,236 Psi www.indiandentalacademy.com
  • 22. VonMisesStressDistributionintheBone Yield Strength of Bone 8,702 Psi www.indiandentalacademy.com
  • 23. FUTURE WORK  Comparison of different implant designs in terms of stress distribution in the bone due to occlusal loads.  Modeling non-homogenous bone material properties by incorporating with CT scan data.  Comparison of different implant-abutment interfaces www.indiandentalacademy.com