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1

Assessment of stress shielding around a dental implant for variation of implant stiffness and parafunctional loading using finite element analysis

Ishak Muhammad Ikman, Daud Ruslizam, Noor Siti Noor Fazliah Mohd, Khor C.Y., Roslan Husniyati

Acta of Bioengineering and Biomechanics

|

2022

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Vol. 24, no. 3

147--159

EN

The aim of this study was to evaluate the mechanical stimuli transfer at the bone-implant interface via stress and strain energy density transfer parameters. This study also aimed to investigate the effect of different implant stiffness and parafunctional loading values on the defined mechanical stimuli transfer from the implant to the surrounding bone. Methods: A three-dimensional finite element model of two-piece threaded dental implant with internal hexagonal connection and mandibular bone block was constructed. Response surface method through face-centred central composite design was applied to examine the influence of two independent factors variables using three levels. The analysis model was fitted to a second-order polynomial equation to determine the response values. Results: The results showed that the implant stiffness was more effective than the horizontal load value in increasing the stress and strain energy density transfers. The interaction between both factors was significant in decreasing the likelihood of bone resorption. Decreasing the implant stiffness and horizontal load value led to the increased stress transfer and unexpected decrease in the strain energy density, except at the minimum level of the horizontal load. The increase in the implant stiffness and horizontal load value (up to medium level) have increased the strain energy transfer to the bone. Conclusions: The stress and strain energy density were transferred distinctively at the bone–implant interface. The role of both implant stiffness and parafunctional loading is important and should be highlighted in the preoperative treatment planning and design of dental implant.

2

The assessment of temperature amplitude arising during the implant bed formation in relation to variable preparation parameters – in vitro study

Kosior Piotr, Nikodem Anna, Kozuń Marta, Dudek Krzysztof, Janeczek M., Dobrzyński Maciej

Acta of Bioengineering and Biomechanics

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2021

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Vol. 23, no. 3

163--173

EN

The main purpose of this study was to analyse the temperatures generated during the bone bed preparation, given the internal structure of the bone bed, the geometry of the hole, and the treatment parameters such as the type of cooling and the rotational speed of the drill. The investigated material was domestic pig ribs, in which holes were drilled three times using two drill bit systems used for Hiossen® and Paltop® dental implantation. The ThermaCAM® P640 thermal imaging camera was used for measurement of drilling temperatures. After the holes were drilled, each rib was examined using the 1172 SkyScan microtomograph, Bruker®, to compare the geometry of the machined holes. The presented study proved that larger diameter drill bits (Hiossen® drill bits) generate more heat during the machining process, as evidenced by higher temperatures obtained for the Hiossen system in each case. It was proved that rotational speed, drill bit diameter and cooling system have a significant effect on the amount of heat generated during bone tissue preparation. The density and type of bone tissue in which the hole is prepared are significant factors affecting the amount of heat generated.

3

The digitisation for the immediate dental implantation of incisors with immediate individual prosthetic restoration

Dobrzański L. B., Achtelik-Franczak A., Dobrzańska J., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2019

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Vol. 97, nr 2

57--68

EN

Purpose: The purpose of this study is to present the author's method of planning the procedure of immediate implant-prosthetic restoration in place of a tooth qualified for removal by performing a surgical template and implant-prosthetic restoration based on data obtained in the CBCT test and intraoral scanning 3D model. Design/methodology/approach: The method of planning the implant surgery through the design and manufacture of surgical templates and implant prostheses performed before the start of medical procedures was described on the basis of actual clinical data from patients with anterior segment teeth qualified for extraction for reasons of complications after endodontic treatment. The placement of the implant was planned using virtual reality, where the bone model and the virtual soft tissue model were combined, which made it possible to perform a surgical template and prosthetic implant restoration. For the manufacturing, 3D printing as stereolithography SLA and selective laser sintering SLS for the surgical template manufacturing and CNC milling in the case of the prosthetic implant were used for restoration. Findings: The method allows planning the implant position based on two connected bone and soft tissue models and allows to design and manufacture a surgical guide. In this way, it becomes possible to place implants in the patient's bone during surgery procedure in the planned position and to install the prosthetic implant restoration in the form of an individual abutment and a PMMA crown during the same procedure in the surgical part. Practical implications: Thanks to the method of computer-aided design/manufacturing CAD/CAM production of surgical templates and prosthetic restoration based only on digital models and the planned position of the implant, it is possible to carry out the procedure of immediate tooth extraction and replacement with permanent prosthetic restoration. The whole process is based on the CBCT test performed at the beginning. The presented method allows shortening the procedure time by four times and the rehabilitation time by 3-6 months when performing the procedure in a minimally invasive manner. Originality/value: This article presents the original design and production method of surgical guides. It allows for precise planning of the implant position and transfer of this data to the patient's mouth during the procedure, enabling permanent prosthetic restoration before starting medical procedures.

4

Zastosowanie diagnostyki termowizyjnej w procedurze osadzenia implantu – praca pilotażowa

Kasprzyk-Kucewicz Teresa, Cholewka Armand, Kaszuba Michał, Kaszuba Natalia, Stanek Agata, Sieroń Karolina, Morawiec Tadeusz

Inżynier i Fizyk Medyczny

|

2019

|

Vol. 8, nr 6

453--457

PL

Termografia z roku na rok staje się coraz bardziej popularnym narzędziem diagnostycznym w medycynie i biologii. Poprzez analizę obrazów termicznych ciała możliwa jest ocena metabolizmu tkanek podpowierzchniowych. Pozwala to na lokalizację występowania stanów zapalnych oraz weryfikację procesów gojenia się tkanek poddanych zabiegom na podstawie zmian temperatury. Celem niniejszej pracy była próba zastosowania obrazowania termicznego w ocenie stanu zapalnego wywołanego założeniem śruby gojącej w trakcie zabiegu implantacji zęba. Obrazowanie termiczne wykonano przed i po zabiegu oraz w 2 i 12 dobie po zabiegu, oceniając zmiany temperatury w obszarze zabiegu (tzw. obszar zęba), w obszarze policzka po stronie zabiegu (tzw. obszar policzka) oraz w obszarze policzka zdrowego (tj. obszar kontrolny). Badania przeprowadzono na grupie 6 pacjentów, a otrzymane wyniki wskazują na wystąpienie stanu zapalnego po zabiegu, co wydaje się być efektem spodziewanym ze względu na procedury wiercenia i wkręcania śruby. Podwyższona temperatura w 2 dobie po zabiegu wskazuje na utrzymywanie się stanu zapalnego, a jej wyraźny spadek obserwowany jest w 12 dobie, co wskazuje na zakończenie fazy regeneracji i gojenia się tkanek. Wstępne pomiary mogą wskazywać na przydatność metody obrazowania termicznego w implantacji zębów.

EN

From year to year thermal imaging is becoming more and more popular diagnostic tool in medicine and biology. The metabolism of subsurface tissues is possible due to the thermal images analysis. Moreover, the inflammation location and tissue healing processes may be verified based on the temperature changes. The aim of study was to try to use thermal imaging in the inflammation assessment, which was caused by healing abutment of a dental implant location. Thermal imaging was done before and after treatment and in 2nd and 12th day after procedure. The assessment of temperature changes was done in procedure location ROI (so-called the tooth area), the cheek on the side of procedure ROI (so-called the cheek area) and the health cheek ROI (so-called the control side). The study included six patients, and the results indicate that inflammation appeared directly after the procedure. In fact, this was expected due to drilling and placing the healing abutment of a dental implant. The increased temperature in 2nd day after procedure may suggest that inflammation is maintained till 12th day, when the healing processes are ending. The preliminary results may indicate the usefulness of thermal imaging in dental implants monitoring.

5

The sensitivity of contact stresses in the mandibular premolar region to the shape of Zirconia dental implant: A 3D finite element study

Velmurugan D., Alphin M. S., Tony B. J. A. R.

Polish Journal of Medical Physics and Engineering

|

2018

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Vol. 24, Iss. 2

55--63

EN

Background: Implant thread profile plays a vital role in magnitude and distribution of contact stresses at the implant-bone interface. The main goal of this study was to evaluate the biomechanical effects of four distinct thread profiles of a dental implant in the mandibular premolar region. Methods: The dental implant represented the biocompatible Zirconia material and the bone block was modelled as transversely isotropic and elastic material. Three-dimensional finite element simulations were conducted for four distinct thread profiles of a dental implant at 50%, 75%, and 100% osseointegration. An axial static load of 500 N was applied on the abutment surface to estimate the stresses acting within the bones surrounding the implant. Results: Regions of stress concentration were seen mostly along the mesiodistal direction compared to that in the buccolingual direction. The cortical bone close to the cervical region of the implant and the cortical bone next to the first thread of the implant experienced peak stress concentration. Increasing the degree of osseointegration resulted in increased von-Mises stresses on the implant-cortical transition region, the implant-cancellous transition region, the cortical bone, and the cancellous bone. Conclusion: The results show that the application of distinct thread profiles at different degrees of osseointegration had significant effect on the stresses distribution contours in the surrounding bony structure. Comparing all four thread profiles, a dental implant with V-thread profile induced lower values of von-Mises stresses and shear stresses on the implant-cortical transition region, implant-cancellous transition region, cortical bone, and cancellous bone.

6

Zastosowanie materiałów biodegradowalnych w stomatologii : przegląd piśmiennictwa

Cykowska-Błasiak M, Woźna A., Dobrzyńska I., Dobrzyński M., Kosior P.

Inżynier i Fizyk Medyczny

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2018

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Vol. 7, nr 6

412--416

PL

W zależności od rodzaju utraconej struktury tkankowej w obrębie układu stomatognatycznego lub przerwania jej ciągłości mogą być wykorzystywane różne biomateriały, które powinny spełniać określone właściwości mechaniczne. Stosowane implanty, skafoldy, a także śruby, mikropłytki lub klamry zazwyczaj wykonane są z tytanu lub jego stopów. Postęp w dziedzinie biomateriałów spowodował, iż współcześnie wykorzystywane są również materiały biodegradowalne, które po spełnieniu swojej funkcji reparacyjnej ulegają samoistnej degradacji (tj. nici chirurgiczne). W pracy przeanalizowano piśmiennictwo dotyczące wykorzystania materiałów biodegradowalnych w stomatologii.

EN

Depending on the type of the lost tissue within the stomatognathic system or breaking of its continuity, various biomaterials having proper mechanical properties can be used. Applied implants, scafolds as well as screws, micro-plates or clamps are usually made of titanium or its alloys. Advances in the field of biomaterials caused that nowadays biodegradable materials are used, and after their reparative function become self-degrading (ie. surgical stitches). The paper analyzes the literature regarding the use of biodegradable materials in dentistry.

7

Wpływ siły na implant jednofazowy umieszczony w kości

Materac A.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2017

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z. 108

97--98

EN

The research carried out about dental implant concern not only esthetic aspect, but also biological and mechanical aspects occurred with inserting the implant into the bone. This paper aim is to present the load impact of one-fazed dental implant inserted in the mandible. The Finite Elements Method was used.

8

Assesment of the binding strength of selected bonding systems used for cementation of implantoprosthetic suprastructures

Malara P., Pasieka A., Paluch K., Sobolewska K.

Journal of Achievements in Materials and Manufacturing Engineering

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2017

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Vol. 80, nr 1

18--24

EN

Purpose: of this paper is the assessment of the strength of binding of selected bonding systems used for fixing prosthetic works. The characteristics of cement materials used for settling the crowns on the implant abutments were also included. The study has presented the evaluation of the binding strength of selected bonding systems used for fixed prosthetic works. Design/methodology/approach: Metal substructures of single-unit cement-retained crown were designed and manufactured using CAD/CAM technology. Created wax models were changed to metal substructures and settled on the abutments attached to implant replicas with a group of commonly used dental cements. The binding strength was tested on Zwick Z 100 static tensile testing machine. Findings: It was found that MaxCem is the strongest material among the tested cements which can withstand the force of 175 N. Double cured cements containing the resins may withstand very high tensile strengths which can be a problem when the crown needs to be taken off. The bonding strength of the dental cements can be influenced by the width of the film, its thickness, even distribution of the cement between the crown and the abutment and the setting time. The higher the viscosity of the cement, the lower the retention of the crown on the implant abutment. Research limitations/implications: In order to limit the designing and manufacturing errors the whole technological process should be carried out with CAD/CAM technology. The cement should be evenly distributed inside the metal cup to prevent from creation of empty spaces between the crown and the abutment. It may be necessary to design and manufacture special holders to maintain the samples in the testing machine to minimalize the risk of creation initial tensile forces. Practical implications: The research gives an insight into the possibilities of choosing the cement for bonding the crown onto the implant abutment preserving the connection between the bone and the implant in case of necessity of the removal of the crown. Originality/value: The research is focused on the binding strength of the cements most commonly used for settling the crowns on the implant abutments. It helps with clinical decision making when choosing the proper cement for these purposes.

9

Experimental verification of two component implant optimization results in context of fatigue life

Szajek K., Wierszycki M., Topoliński T., Łodygowski T.

Eksploatacja i Niezawodność

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2017

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Vol. 19, no. 2

166--171

PL

W artykule przedstawiono weryfikację zoptymalizowanego implantu zębowego w kontekście wytrzymałości zmęczeniowej przy pomocy testów laboratoryjnych. Optymalne rozwiązanie otrzymano przy zastosowaniu modelu numerycznego metodą elementów skończonych oraz strategii łączącej algorytm genetyczny z procedurą Hooke-Jeeves. Dla projektu bazowego oraz ulepszonego rozwiązania przeprowadzono serię testów na maszynie Instron 8874 używając metody Locati przyśpieszonego badania zmęczeniowego. Prezentowane badania są weryfikacją efektywności przyjętej strategii optymalizacji. Z powodu zastosowanej metodologii badań eksperymentalnych, efekty optymalizacji poddano tylko porównaniu jakościowemu.

EN

In this paper the verification of the optimal dental implant design is presented. It is focused on fatigue fracture and is carried out with experimental tests. The optimal design was obtained with an optimization strategy using finite element model and genetic algorithm hybridized with Hooke-Jeeves technique. The fatigue tests of the prototype and initial designs of dental implants have been performed on Instron 8874 testing system using Locati method of an accelerated fatigue testing. The presented studies are excepted to verified the effectiveness of optimization strategy. Due to used methodology for experimental verification only qualitative effects of the optimization are compared. The work is a part of long term project under the grant R13 0020 06 “Development and preparation of dental implant prototypes”.

10

Projekt stanowiska do badań wytrzymałości połączenia klejonego stosowanego w protetyce stomatologicznej

Materac A., Niesłony A.

Aktualne Problemy Biomechaniki

|

2017

|

z. 12

57--64

PL

Połączenie klejone może zostać zniszczone pod wpływem codziennego funkcjonowania żuchwy pacjenta. Prowadzi to do rozłączenia korony zęba z łącznika implantu. Stanowisko do badań wytrzymałościowych połączenia klejonego może przynieść wiele korzyści dla badań i nauki. Wyniki badań wykonanych na stanowisku w skuteczny sposób będą mogły przyczynić się do określenia trwałości doraźnej i zmęczeniowej tego typu połączenia w implancie stomatologicznym osadzonym w szczęce pacjenta.

EN

Adhesive connection can be damage under the influence of the patient's jaw functioning, which leads to falling off the crown from the abutment. Strength testing stand for adhesive connection can bring many benefits to science and research. Such studies will greatly facilitate the estimation of fatigue life of this type of connection in the implant assembled in the jaw of the patient.

11

Biomechanical analysis of individual all-ceramic abutments used in dental implantology

Ziębowicz B., Ziębowicz A., Bączkowski B., Kajzer W., Kajzer A.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 3

1357--1362

EN

Biomechanical analysis of individual all-ceramic abutments used in dental implantology The paper presents the results of finite element analysis and experimental testing under simulated physiological loading conditions on issues shaping the functional properties of individual all-ceramic abutments manufactured by CAD'CAM technology The conducted research have cognitive significance showing the all-ceramic abutment behavior, as a key element of the implantological system, under the action of cyclic load. The aim of this study was evaluation the fatigue behavior of yttria-stabilized zirconia abutment submitted to cyclic stresses, conducted in accordance with EN ISO 14801 applies to dynamic fatigue tests of endosseous dental implants.

12

Porównanie metody klejenia oraz przykręcania korony zęba do łącznika implantu stomatologicznego przy pomocy analizy MES

Materac A., Niesłony A.

Aktualne Problemy Biomechaniki

|

2016

|

z. 11

95--102

PL

Istnieją dwie metody osadzania sztucznej korony zęba na łączniku. Wyróżniamy klejenie (cementowanie), które jest kosztowną metodą, ale pozostawia bardzo zadowalający efekt końcowy leczenia oraz przykręcanie korony zęba – tańsze, jednak problematyczne i pozostawia ślady lakowania na koronie. W artykule przedstawiono porównanie wytrzymałości poszczególnych połączeń przeprowadzone przy pomocy Metody Elementów Skończonych. Uproszczone modele zostały poddane sile równej 100N oraz 500N.

13

Numerical verification of two-component dental implant in the context of fatigue life for various load cases

Szajek K., Wierszycki M.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 1

103--113

EN

Purpose: Dental implant designing is a complex process which considers many limitations both biological and mechanical in nature. In earlier studies, a complete procedure for improvement of two-component dental implant was proposed. However, the optimization tasks carried out required assumption on representative load case, which raised doubts on optimality for the other load cases. This paper deals with verification of the optimal design in context of fatigue life and its main goal is to answer the question if the assumed load scenario (solely horizontal occlusal load) leads to the design which is also “safe” for oblique occlussal loads regardless the angle from an implant axis. Methods: The verification is carried out with series of finite element analyses for wide spectrum of physiologically justified loads. The design of experiment methodology with full factorial technique is utilized. All computations are done in Abaqus suite. Results: The maximal Mises stress and normalized effective stress amplitude for various load cases are discussed and compared with the assumed “safe” limit (equivalent of fatigue life for 5e6 cycles). Conclusions: The obtained results proof that coronial-appical load component should be taken into consideration in the two component dental implant when fatigue life is optimized. However, its influence in the analyzed case is small and does not change the fact that the fatigue life improvement is observed for all components within whole range of analyzed loads.

14

Analysis and possibility of modifying the properties of the Ti6Al4V titanium alloy via the method of the preparation for the use in a dental implant

Łukaszewicz A., Szota M.

Archives of Materials Science and Engineering

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2015

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Vol. 74, nr 2

58--66

EN

Purpose: In the given paper the analysis of the Ti6Al4V alloy has been carried out, methods for manufacturing of components for use in dentistry as well as the impact on the human body have been described. Then the controversy over the possibility of modifying the properties of a final product - an implant by the use of the injection method not used so far in that field has been taken. Design/methodology/approach: Titanium alloys in dental application should be characterized by high corrosion resistance and biocompatibility. In the framework of the given paper the commercial methods of the production of titanium elements for biomedical applications have been analysed. Findings: In the framework of the analysis of the possibilities of changes in the properties of the Ti6Al4V titanium alloy, the injection method for the production of a finished product - an implant, so far not used for a commercial scale, has been proposed. Practical implications: In practice, the application of those considerations will find the representation in further researches carried out by the possibility of using the injection method to modify and improve the mechanical and physico-chemical properties of the final product. An important aspect is the fact that during the modification of the manufacturing process the chemical composition of the alloy out of which the implant will be produced, will not change. Originality/value: The fact of taking the controversy over the possibility of using the injection methods for the production of dental implants, also for an industrial scale is an original aspect in that consideration.

15

Modelowanie i analiza MES implantu stomatologicznego pod odbudowę uzębienia

Kutrzuba K., Kromka-Szydek M.

Aktualne Problemy Biomechaniki

|

2015

|

z. 9

67--72

PL

W artykule przedstawiono wyniki analizy MES modelu żuchwy wraz z wszczepionym implantem stomatologicznym. Przeprowadzona analiza miała na celu zbadanie interakcji pomiędzy tkanką kostną żuchwy a wszczepem śródkostnym poprzez określenie rozkładu naprężeń w żuchwie i implancie, odkształceń oraz przemieszczeń występujących w obu elementach przy ich funkcjonalnym obciążaniu. Uwzględniono różne sposoby zamodelowania tkanki kostnej oraz zbadano różnice w funkcjonowaniu zespołu żuchwa – implant, wynikające z zastosowania różnych materiałów przy produkcji łącznika implantu.

EN

Finite Element Analysis was performed in ANSYS Workbench 12.1 for model of mandible with dental implant. It allowed to define stress distribution in bone and components of dental implant according to the way in which the bone was modeled. Other examined parameters were directional strain and equivalent elastic deformation. The influence of the material type used in implant components production was also checked in this work. It was found that the use of polyoxymethylene connector caused raise of equivalent stress in the implant. Tests showed that the way of bone modelling significantly affected on the results.

16

Analiza stanu naprężenia w połączeniu łącznik-korona dla korony zęba z nawisem

Materac A., Niesłony A.

Aktualne Problemy Biomechaniki

|

2015

|

z. 9

79--82

PL

W implantologii stomatologicznej często zdarza się, że indywidualny przypadek pacjenta wykracza poza przyjęte, sprawdzone metody leczenia implantacyjnego. Z taką sytuacją spotykamy się, gdy pojawia się konieczność zastosowania korony zęba z większym nawisem niż jest to powszechnie stosowane. Zbyt duży nawis prowadzi do wykruszania się kleju i odpadnięcia korony od łącznika. Analiza stanu naprężenia przy sile 100N, 200N i 500N w połączeniu łącznik-korona z nawisem ma na celu sprawdzenie wielkości naprężeń i porównanie ich z maksymalnymi wartościami dopuszczalnymi.

EN

An individual patient's case very often exceed beyond the accepted treatments for implantation in implant dentistry. It may be caused by the need of using the crown with the larger overhang than it is commonly used. This overhang leads to chipping glue and fall off the crown. The aim of stress analysis at forces of 100N, 200N and 500N in abutment-crown connection is to check the value of the stress and its influence on the strength of the implant.

17

Three dimensional finite element analysis of a novel osteointegrated dental implant designed to reduce stress peak of cortical bone

Zheng L., Yang J., Hu X., Luo J.

Acta of Bioengineering and Biomechanics

|

2014

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Vol. 16, no. 3

21--28

EN

A new type of dental implant was designed as multi-component mainly including inset and abutment between which a gap was introduced to guide the force to transmit from the cancellous bone to cortical bone, with the intention to lower the stress peak at cortical bone. By the way of finite element analysis (FEA) associated with advanced computer tomography (CT) and 3D model reconstruction technology to construct precise mandible model, biomechanical aspects of implant were investigated. Compared with traditional implant that created stress dominantly at cortical bone, stress peak at the implant/bone interface in the cervical cortex decreased sharply (about 51%) for new type of implant. Furthermore, varying implant shape and gap dimensions to optimize the design of this new implant was performed. Optimization results revealed that: 1) screwed cylindrical implant is superior to tapered, stepped and smooth cylindrical implant in effectively decreasing the stress peak of bone; 2) deepening and widening gap would contribute to the decline of stress peak, but at the cost of break and destruction of the inset; 3) suitable gap size with the depth of 7mm and width of 0.3mm would be applicable. This work may provide reference forclinical application of dental implant.

18

The mechanical behaviour of dental implant with stress barrier

Merdji A., Aminallah L., Bachir Bouiadjra B., Serier B., Mootanah R., Ould Chikh E.B., Moslih A.M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2011

|

z. 99

36-37

EN

It has been well known that the success of dental implant is heavily dependent on initial stability and long-term osseo-integration due to optimal stress distribution in the surrounding bones. For this reason, the search of the rational solutions to reduce these stresses has become an important issue in this field. Alternatives to reduce the forces transmitted to implants have been studied, including variations in implant positioning, implant design, prosthesis shape, occlusal requirements, prosthetic components and prosthetic materials. Thus, a new concept of adding a bio-elastomer to the prosthetic components of implant system was interposed between the abutment and the framework crown in order to damp the occlusive shocks and to attenuate the stress concentrated at the implant/bone interface. The new implant system design was assessed by the three dimensional finite element techniques using ABAQUS program to study the effect of elastomer material under an occlusal load on the induced equivalent von Mises interface stresses. These stresses were compared with those provoked by the standardized implant. The von Mises stress distribution indicated that stress was maximal around the top of the implant with varying intensities in the different loading cases. The stress was highest in the cortical bone at the neck of implant and lowest in the cancellous bone. Overall, the novel implant provoked lower interface stresses only in the cortical bone due to the stress shielding effect of the elastomeric stress barrier.

19

Improvement of drawability and fabrication possibility of dental implant screw made of pure titanium

Yoshida K., Saiki Y., Ohkubo Ch.

Hutnik, Wiadomości Hutnicze

|

2011

|

Vol. 78, nr 1

153-156

EN

We examined the effects of processing conditions on drawability, and the radius thickness ratio of drawn wire diameter to die bore diameter. Then, we examined the fabrication possibility of biocompatible dental implant screws made of pure titanium in the context of being allergy free, which were fabricated by wire drawing, heading and form rolling. We also examined the practicality of the dental implant screw made of pure titanium.

PL

W pracy określono wpływ warunków procesu na podatność tytanu na ciągnienie i współczynnik grubości promienia ciągnionego drutu do średnicy kalibrującej ciągadła. Następnie określono możliwości wytwarzania wkrętów na implanty dentystyczne, wykonanych z czystego tytanu, które nie powodowałyby alergii. Wkręty te wytwarzane są na drodze ciągnienia, spęczania i kształtowania na rolkach. Określono także praktyczność wkrętów na implanty dentystyczne wykonanych z czystego tytanu.

20

Optimization of dental implant using genetic algorithm

Łodygowski T., Szajek K., Wierszycki M.

Journal of Theoretical and Applied Mechanics

|

2009

|

Vol. 47 nr 3

573-598

EN

The subject of the present work is optimization of the modern implant system Osteoplant, which was created and is still developed by Foundation of University of Medical Sciences in Poznań. Clinical observations point to the occurrence of both early and late complications in the case of all two-component implant systems. In many cases, these problems are caused by mechanical fractures of the implants themselves. The obtained results of the previous studies focused on necessary changes of the implant mechanical behavior, which helped to achieve the required long-term strength. However, modifications of the present dental implant system are not obvious. In this paper, an optimization of the Osteoplant dental implant system, with the use of FEA and genetic algorithms is discussed.

PL

Przedmiotem prezentowanej pracy jest problem optymalizacji systemu implantologicznego Osteoplant, który został opracowany i wciąż jest ulepszany przez Fundację Uniwersytetu Medycznego w Poznaniu. Obserwacje kliniczne potwierdzają występowanie powikłań zarówno we wczesnej, jak i późnej fazie użytkowania implantu. Dotychczas otrzymane wyniki wskazują, że wydłużenie bezawaryjnego okresu użytkowania implantu wymaga wprowadzenia zmian w jego pracy mechanicznej. Jednakże, ustalenie szczegłów modyfikacji nie jest oczywiste. W artykule została opisana procedura optymalizacji systemu implantologicznego Osteoplant z użyciem analizy metodą elementów skończonych oraz algorytmu genetycznego.