Design of additive manufactured lattices with graded porosities

Design of additive manufactured lattices with graded porosities for dental implants
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Table of Contents
Chapter 1: Introduction....................................................................................................................4
1.1 Background.......................................................................................................................4
1.2 Aim, Objectives and Research Questions.........................................................................7
1.3 Research Structure............................................................................................................7
Chapter 2: Literature Review...........................................................................................................9
2.1 Dental Implants......................................................................................................................9
2.2 Design Optimization of Dental Implants.............................................................................13
2.3. Lattice Structure ..............................................................................................................17
Chapter 3: Research Methodology................................................................................................22
Chapter 4: Data findings and analysis...........................................................................................26
4.1 Qualitative Data analysis.....................................................................................................26
Chapter 5: Conclusion...................................................................................................................31
5.1 Conclusion...........................................................................................................................31
5.2 Future Work.........................................................................................................................32
References......................................................................................................................................34

Chapter 1: Introduction
1.1 Background
As commented by Wally et al. (2019), a dental implant is a biocompatible surgical element
which is placed in the jawbone for supporting dental prostheses that include crowns, denture
replacements and bridges. In recent medical science, implants have been constructed by
employing solid materials that are coated with biocompatible layers. A bone is living tissue
which is modified with the response towards external loading. It has been reduced with the
mechanical work that has been causing bone restoration. It has been causing failure to the
implantation procedure. Therefore, for resolving these issues, this research has proposed a new
design for dental implant structure which might minimize bone loss and interface failure. The
multiscale and objective design has been optimizing dental implants by implementing lattice
materials (Wally et al. 2015). A 3D FEA model of the jawbone segment has been developed. The
proposed design has been capable of reducing interface failure and boneless implant. The
enhanced implant is made by additive manufacturing. Additive manufacturing technology helps
in facilitating the production of complicated shapes and geometrics which has not been produced
by conventional manufacturing procedures. This implant can anchor hold capacities of the
replaced tooth and various safe techniques for missing replacement of the tooth. A 3D view of
dental implant has been shown in figure 1:

Figure 1: 3D view of dental implant
(Source: Wally et al. 2015)
As shown in figure, the lower part of the implant is inserted into jaw and properly
attached with the jawbone. Therefore, recovery procedure in the implant get started and it
provides strong structural support in the implant. The long term profit of dental implants includes
proper looks, speech, self-esteem and comfort. This type of dental implant helps patient in
performing their daily works including eating and chewing.
The success rate related to dental implants has been subjected to a proper biochemical
environment that impact material properties of implant and prosthesis. Bone loss occurs in case
bine is reabsorbed than is formed by the body. It has been depending on several factors that
include biocompatibility of implant and its surface features, surgical techniques utilized and
restorative treatment done. The properties of the lattice structures that are linear are discussed in
the research. The design that is proposed is capable of minimizing the failure of the interface and
the implant that is boneless. As commented by Wang et al. (2016), it has been found that loss of
bone occurs due to a mechanical mismatch in between implant and bone. However, elastic
moduli of materials have been higher than that of bine, The Young Modulus of bone varies from

1-17 GPa. However, the Young Modulus of titanium is about 110 GPa (Tan et al. 2017).
Utilization of porous metals in implantation of dental design is considered as a solution for
mitigating these issues. Porous metals have the ability for ingrowth of bone by avoiding stress
and stiffness of the implant. As commented by Joshi et al. (2013), there are many layers of
coating and roughening techniques that have been utilized for improving cells and bone bonding
implanting surface.
Previous researches have revealed that porous geometry might be useful alternative for huge
structures in dental implantation. Cellular structures have been providing a suitable biological
environment for host tissue in growing in pores that provides stability to implantation. Cell
material and grid structure are considered as the terms that are proportional to each other. The
lattice's structure is a specific sort of material of a cell. The materials of these cells have their
qualities characterized dependent on the sort of porosity that implies whether these are open or
are shut. These likewise rely upon the structures of the unit cells being of two kinds in particular
stochastic and nonstochastic (Onal et al. 2018). The biomedical supplements, the parts that bear
the weight, the warmth trades and the channels are sure instances of the kind of cell materials.
Some different models are grid structures, crumbled materials, honeycomb and forward. The
structures of cross sections have the normal for non-stochastic bearings identified with the unit
cells' structure and simultaneously to those pores that are open. The dental embed has been of
great help in getting a better understanding of eating all that is more helpful with the time. The
unit cell identified with geometry and to the included topology is utilized for fitting the various
mechanical properties connected to the part. As per Van der Stok et al. (2013), cells which are
utilized in biomedical supplements can be ordered by their lead of twisting. There exist two sorts
of these unit cells to be specific reticulated and stochastic. Reticulated unit cells are those unit

cells which have been sorted out legitimately and distinctly. At the point when thought about
based on the mechanical properties the reticulated cross sections were observed to be superior to
the stochastic grids. If there should be an occurrence of orthopaedic additions the stretch
instructed unit cells were observed to be progressively successful contrasted with the bend ruled
unit cells. The structure of the cross sections discovers use in plans of the tissue and the bone
stages having the idea of the unit cell plans. The structure talked about above can be parcelled
into four connected social affairs that are CAD-based, certain surfaces, topology progressed and
picture-based unit cells (Trevisan et al. 2018).
1.2 Aim, Objectives and Research Questions
This research has aimed at focusing on utilizing concept of additive lattice production
with graded porosities for ensuring dental implantations.
Objectives are mentioned below:
 To analyses concept of lattice structures in additive manufacturing
 To critically analyze need of dental implants in medical science and issues faced in this
process
 To ensure proper dental implants with advanced technologies and procedures including
additive manufacturing
Following are the research questions:
 What is the concept of lattice structures in additive manufacturing?
 What is the need of dental implants in medical science and issues faced in this process?
 How to ensure proper dental implants with advanced technologies and procedures
including additive manufacturing?

1.3 Research Structure
 Chapter 1: Introduction
 Chapter 2: Literature Review
 Chapter 3: Research Methodology
 Chapter 4: Data Findings and Analysis
 Chapter 5: Conclusion and Recommendations

Chapter 2: Literature Review
2.1 Dental Implants
As commented by Kadkhodapour et al. (2015), there has been an increase in the success
rate of implantation of 95 % in case, implantation is properly designed and inserted. Ahmadi et
al. (2014) expect that implants need to be functioned for life long period. This can be justified by
survival rate of an implant at 15 years is as high as 90% of proper and professional care is taken.
The success rate of dental implant always depends on factors that include the design of abutment
and the technique of abutment screw in an implant. The procedures that are involved in mending
aid in the development of the bone around the embed giving solid auxiliary aid to embed. The
long haul benefits of the dental inserts are confidence, improved appearance and solace
discourse. As argued by Du Plessis et al. (2018), implant failure occurs due to insufficient
biomechanical bonding between the implant and the surrounding jawbone. Improper
biomechanical binding is initiated and improper Osseo integration of jawbone as it is not
accepting it. Other implant failures have been due to improper design of the tooth fixture leads to
an overload of abutment screw and microfractures in the implant. The figure above demonstrates
the different sorts of structures of the framework which discover applications in biomedical
applications. The arrangement which relies upon CAD utilizes the unit cells acquired from
Archimedean polyhedral and Platonic solids. The direct 3D square, tetrahedral, valuable stone
and the dodecahedron unit cells have been incorporating into points of reference (Surmeneva et
al. 2017). There exist a portion of the unit cells those at explicit occasions get insinuated triply
irregular and irrelevant surfaces. These immaterial surfaces are subject to specific ideas of
differential geometry of surfaces and these are additionally viewed as when making bone tissue
inferable from the idea of the zero curves in the mean which can be said to be comparative or