Journal of Oral Implantology February 2013 - (Page 23)
RESEARCH
Effect of Model Parameters on Finite Element Analysis of
Micromotions in Implant Dentistry
Werner Winter, Dr-Ing1
Daniel Klein1
Matthias Karl, PD Dr2*
Micromotion between dental implant and bony socket may occur in immediate-loading scenarios. Excessive
micromotion surpassing an estimated threshold of approximately 150 lm may result in fibrous encapsulation
instead of osseointegration of the implant. As finite element analysis (FEA) has been applied in this field, it was
the aim of this study to evaluate the effect of implant-related variables and modeling parameters on simulating
micromotion phenomena. Three-dimensional FEA models representing a dental implant within a bony socket
were constructed and used for evaluating micromotion (global displacement) and stress transfer (von Mises
equivalent stress) at the implant-bone interface when static loads were applied. A parametric study was
conducted altering implant geometry (cylinder, screw), direction of loading (axial, horizontal), healing status
(immediate implant, osseointegrated implant), and contact type between implant and bone (friction free,
friction, rigid). Adding threads to a cylindrically shaped implant as well as changing the contact type between
implant and bone from friction free to rigid led to a reduction of implant displacement. On the other hand,
reducing the elastic modulus of bone for simulating an immediate implant caused a substantial increase in
displacement of the implant. Altering the direction of loading from axial to horizontal caused a change in
loading patterns from uniform loading surrounding the whole implant to localized loading in the cervical area.
Implant-related and bone-related factors determine the degree of micromotion of a dental implant during the
healing phase, which should be considered when choosing a loading protocol.
Key Words: dental implantation, immediate dental implant loading, osseointegration, motion
INTRODUCTION
M
1
icromotion may be defined as a
phenomenon that occurs at the
interface of mating components
belonging to one mechanical system leading to the displacement
Department of Mechanical Engineering, University of ErlangenNuremberg, Erlangen, Germany.
2
Department of Prosthodontics, School of Dental Medicine,
University of Erlangen-Nuremberg, Erlangen, Germany.
* Corresponding author, e-mail: matthias.karl@uk-erlangen.de
DOI: 10.1563/AAID-JOI-D-11-00221
of one component relative to the second one. As a
prerequisite, a non–force-fit contact, allowing for
sliding movements, has to be present between the
single components. In implant dentistry, micromovement of components may occur at two
interfaces, the implant-abutment connection1,2
and the bone-implant interface.3 Numerous articles
dealing with the effects of micromotion at both
levels mentioned can be found, although a sound
mechanical description is often lacking.
Micromotion at the implant-abutment level has
been described to result in microgap formation with
Journal of Oral Implantology
23
Table of Contents for the Digital Edition of Journal of Oral Implantology February 2013
Could the Fountain of Youth Be All in Your Bones?
Vertical Bone Augmentation With Simultaneous Implant Placement Using Particulate
Evaluation of the Bone Healing Process Utilizing Platelet-Rich Plasma Activated by Thrombin
Effect of Model Parameters on Finite Element Analysis of Micromotions in Implant Dentistry
Peri-Implant Defect Augmentation With Autogenous Bone: A Study in Beagle Dogs
Would Nitric Oxide be an Effective Marker for Earlier Stages of Peri-Implant Disease? An
The Effect of Different Surface Treatments on Cement-Retained Implant-Supported
Effect of Rotating Osteotomes on Primary Implant Stability—An In Vitro Investigation
Horizontal Augmentation Through the Ridge-Split Procedure: A Predictable Surgical
The Bis-Acryl Stent
Clinical, Histological, and Histomorphometrical Analysis of Maxillary Sinus Augmentation
A Technique to Salvage a Single Implant-Supported Fixed Dental Prosthesis Having a
Ridge Expansion and Immediate Placement With Piezosurgery and Screw Expanders in
Pterygoid Implants for Maxillofacial Rehabilitation of a Patient With a Bilateral Maxillectomy
Technology in Maxillary Premolar Region: A New Strategy for Soft Tissue Management
Fracture of Anterior Iliac Crest Following Bone Graft Harvest in an Anorexic Patient: Case
A Technique for Constructing a New Maxillary Overdenture to a Nonretrievable Implant
Edentulous Maxillary Arch Fixed Implant Rehabilitation Using a Hybrid Prosthesis Made of
Journal of Oral Implantology February 2013
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