A conical implant-abutment interface at the level of the marginal bone improves the distribution of stresses in the supporting bone. An axisymmetric finite element analysis. 2003 Jun Hannson S. PubMed It has been hypothesized that marginal bone resorption may result from microdamage accumulation in the bone. In light of this, a dental implant should be designed such that the peak stresses arising in the bone are minimized. The load on an implant can be divided into its vertical and horizonta ...

A New Generation Of Restorative Adhesives 2005 Dr Liviu Steier smile-on Microfilled composites, hybrid composites and submicrometer hybrid composites have each come with their own advantages and disadvantages. The newest generation of restorative materials are nanofilled composites. New features as described by the producer: ‘Nano particle filler technology gives unbeatable polish ability in a high strength, all purpose composite. New, Polycarbonate/Bis-GMA resin is not only tough, it pr ...

AASTROM BIOSCIENCES REPORTS POSITIVE BONE REPAIR RESULTS IN CLINICAL FEASIBILITY TRIAL 5/17/2005 AASTROM Biosciences ANN ARBOR, Mich., May 17 /PRNewswire-FirstCall/ -- Aastrom Biosciences, Inc. (Nasdaq: ASTM) announced today the results from its feasibility clinical trial conducted with the Institut de Terapia Regenerativa Tisular (ITRT) in Barcelona, Spain to evaluate the use of Aastrom's Tissue Repair Cells (TRCs) for the treatment of severe long bone non-union fractures. A report with de ...

ABOUT THE ADA The ADA was established in 1859. Today, we have more than 149,000 members. As the world's largest and oldest national dental association, we are the oral health authority committed to both the public and the dental profession. ADA Mission & Vision ADA Mission Statement The ADA is the professional association of dentists committed to the public's oral health, ethics, science and professional advancement; leading a unified profession through initiatives in advocacy, education, research and the development of standards. ADA Vision Statement The American Dental Association: The oral health authority committed to the public and the profession.

Analysis of strain around endosseous dental implants opposing natural teeth or implants. Hekimoglu C, Anil N, Cehreli MC. 2004 Nov PubMed Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. STATEMENT OF PROBLEM: Natural teeth and implants have different force transmission characteristics to bone. PURPOSE: The purpose of this study was to compare strains induced around a natural tooth opposing an implant with strains around occluding implants under stati ...

Biomechanical aspects of marginal bone resorption around osseointegrated implants: considerations based on a three-dimensional finite element analysis. 2004 Aug Kitamura E, Stegaroiu R, Nomura S, Miyakawa O. PubMed OBJECTIVES: Although bone loss around implants is reported as a complication when it progresses uncontrolled, resorption does not always lead to implant loss, but may be the result of biomechanical adaptation to stress. To verify this hypothesis, a three-dimensional finite element ...

Biomechanical Evaluation of a Wide Diameter Bicon Dental Implant in VariousBone Conditions Dinçer Bozkaya, Sinan Müftü, Ph.D. Northeastern University ABSTRACT An association between higher implant failure rates and regions of poor bone density,commonly found in the posterior maxilla and mandible, has been reported in theliterature. Moreover, implant placement in posterior regions is often limited by anatomicchanges due to edentulism, where implant design alteration may be an alternative fort ...

Cement fixation and screw retention: parameters of passive fit. An in vitro study of three-unit implant-supported fixed partial dentures. 2004 Aug Heckmann SM, Karl M, Wichmann MG, Winter W, Graef F, Taylor TD. PubMed It is generally assumed that passively fitting superstructures are a prerequisite for long-lasting implant success. In the study presented, the strain development of three-unit implant fixed partial dentures (FPDs) was evaluated at the bone surrounding the implant and on the su ...

Comparison of non-linear finite element stress analysis with in vitro strain gauge measurements on a Morse taper implant. 2003 Mar-Apr Iplikcioglu H, Akca K, Cehreli MC, Sahin S PubMed PURPOSE: To understand the mechanical and biomechanical behavior of dental Implants, validation of stress and strain measurements is required. The objective of this study was to compare a non-linear finite element stress analysis with in vitro strain gauge measurements on strains in an implant-abutment complex ...

Dental Traumatology 2003 Blackwell Publishing by Martin Trope Abstract Flanagan, D. External and occlusal trauma to dental implants and a case report. Dent Traumatol 2003; 19: 160–164. © Blackwell Munksgaard, 2003. Abstract – Dental implants subjected to traumatic forces can survive. Cortical bone seems to provide a protective energy-absorbing mechanism in the collagen polymer that helps to prevent microcracking and fracture of bone. The collagen polymer has cross-linking bonds that break and absorb the energy of a traumatic impact so as not to cause damage to the main polymer chain. A case reported demonstrates that a traumatic force damaged the implant prosthetic crown, but not the bone encasing the implant or the integration of the implant.

Design optimization of functionally graded dental implant. 2004 Hedia HS, Mahmoud NA. PubMed The continuous increase of man's life span, and the growing confidence in using artificial materials inside the human body necessities introducing more effective prosthesis and implant materials. However, no artificial implant has biomechanical properties equivalent to the original tissue. Recently, titanium and bioceramic materials, such as hydroxyapatite are extensively used as fabrication material ...

Effects of two preparation designs and pontic distance on bending and fracture strength of fiber-reinforced composite inlay fixed partial dentures. 2003 Oct Song HY, Yi YJ, Cho LR, Park DY. PubMed STATEMENT OF PROBLEM: Joint fractures observed in Targis/Vectris inlay adhesive fixed restorations may be related to the preparation design. PURPOSE: This in vitro study investigated the effects of the proximal tooth preparation design and the pontic distance on the fracture strength and the amount ...

Evaluation of load transfer characteristics of five different implants in compact bone at different load levels by finite elements analysis. 2004 Dec Bozkaya D, Muftu S, Muftu A. PubMed STATEMENT OF PROBLEM: The external contour of an implant and the magnitude of occlusal loading can have significant effects on the load transfer characteristics and may result in different bone failure rates for different implant systems. PURPOSE: The goal of this study was to investigate the effects of exter ...

Examination of the bone-implant interface in experimentally induced osteoporotic bone March 13, 2004 By: Cho P, Schneider GB, Krizan K, Keller JC. - Dows Institute for Dental Research, College of Dentistry, The University of Iowa, Iowa City, 52242, USA PubMed Abstract: The objective of this study was to explore the hypothesis that osteoporotic-like (OP) conditions have a negative effect on osseointegration (OI) of dental implants. Using an ovariectomized (OVX) rat model, the extent of OI u ...

Fibre reinforced composite dental bridge. Part I: Experimental investigation. 2004 Sep; Li W, Swain MV, Li Q, Ironside J, Steven GP. PubMed This experimental investigation aims at revealing the mechanical behaviour and failure pattern of direct fibre-reinforced resin-bonded dental bridge with various designs. To evaluate the overall effects of some newly developed dental materials, in the experiment, genuine composite dental bridge specimens are prepared and tested. The ultimate load, stiffn ...

Fibre reinforced composite dental bridge. Part II: Numerical investigation. Li W, Swain MV, Li Q, Ironside J, Steven GP. September 2004 PubMed Motivated by the clinical success and limitations on experimental investigation of the fibre-reinforced composite dental bridge, this paper aims at providing a numerical investigation into the bridge structure. The finite element (FE) model adopted here is constructed from computer tomography images of a physical bridge specimen. The stress and strain ...

Finite element analysis of four thread-form configurations in a stepped screw implant. 2004 Mar Geng JP, Ma QS, Xu W, Tan KB, Liu GR. PubMed The purpose of this study was to determine the optimal thread form configuration for an experimental stepped screw implant. Two-dimensional finite element analysis was applied to model the experimental stepped screw implant in a standard cross-section of the posterior human mandible digitized from a CT-generated patient data set. Four different thread f ...

Finite element analysis to determine implant preload. 2003 Dec Lang LA, Kang B, Wang RF, Lang BR. PubMed STATEMENT OF PROBLEM: The nature of the forces used to clamp implant components together, and how they are generated and sustained, is lacking in the literature. PURPOSE: This study examined the dynamic nature of developing the preload in an implant complex using finite element analysis. METHODS: The implant complex was modeled in accordance with the geometric designs for the Nobel Biocar ...

Finite Element Method - perio-endo concept 2004 Vandana KL* and Kartik M ABSTRACTIn the last decade the application of a well proven predictive technique theFinite Element Method, originally used in structural analysis hasrevolutionized dental biomedical research. Finite Element analysis wasintroduced originally as a method for solving structural mechanicalproblems, which was later recognized as a general procedure for numericalapproximation to all physical problems that can be modeled by a d ...

1993(1)10. Force transfer in implant dentistry: Basic concepts and principles Bidez M.- Misch C.E. September 1992 - Journal of Oral Implantology 1992: - Vol. 18 No. 3 pp 264-274 © Specialist Dental Summaries Ltd. 1997. All rights reserved The primary function of virtually all dental implants is to transfer and distribute the forces generated by functional activities to the bone of the maxilla or mandible in which they are placed. This article describes these forces, their components, m ...

Force transmission of one- and two-piece morse-taper oral implants: a nonlinear finite element analysis. 2004 Aug; Cehreli MC, Akca K, Iplikcioglu H. PubMed PURPOSE: To compare force transmission behaviors of one-piece (1-P) and two-piece (2-P) morse-taper oral implants. MATERIAL AND METHODS: A three-dimensional finite element model of a morse-taper oral implant and a solid abutment was constructed separately. The implant-abutment complex was embedded in a phi 1.5 cm x 1.5 cm acrylic resin c ...

Functional behaviour of bone around dental implants. 2004 June Stanford CM, Schneider GB. PubMed Achieving a long-term stable implant interface is a significant clinical issue when there is insufficient cortical bone stabilisation at implant placement. Clinical outcomes studies suggest that the higher risk implants are those placed in compromised cortical bone (thin, porous, etc.) in anatomical sites with minimal existing trabecular bone (characterised as type IV bone). In establishing and m ...

Implant biomechanics in grafted sinus: a finite element analysis. 2004 Fanuscu MI, Vu HV, Poncelet B. PubMed This in vitro study investigated the stress distribution in the bone surrounding an implant that is placed in a posterior edentulous maxilla with a sinus graft. The standard threaded implant and anatomy of the crestal cortical bone, cancellous bone, sinus floor cortical bone, and grafted bone were represented in the 3-dimensional finite element models. The thickness of the crestal cor ...

Implant design and interface force transfer. A photoelastic and strain-gauge analysis. Cehreli M, Duyck J, De Cooman M, Puers R, Naert I. 2004 Apr PubMed Department of Prosthetic Dentistry, BIOMAT Research Group, Catholic University of Leuven, Belgium. OBJECTIVES: To compare stress and strain magnitudes of butt-joint and internal-cone oral implants in a bone simulant. MATERIAL AND METHODS: Photoelastic and strain-gauged models of solitary Branemark, ITI and Astra Tech implants were obtained ...

Implant Surfaces: Present and Future 2004 Paolo Trisi, D.D.S., Ph.D. Zimmer Implant surfaces are rapidly evolving in response to the increasing demand for faster healing and for success in more challenging cases. Osseointegrated implants seem to perform well in long-term studies, but short implants placed in posterior jaws with low-density bone showed lower percentages of success. The improvement of the implant surface with a TPS- or HA-coating, and more recently, roughening of the CP-Ti ...

In vitro shear bond strength of cementing agents to fixed prosthodontic restorative materials. 2004 Sep Piwowarczyk A, Lauer HC, Sorensen JA. PubMed STATEMENT OF PROBLEM: Durable bonding to fixed prosthodontic restorations is desirable; however, little information is available on the strength of the bond between different cements and fixed prosthodontic restorative materials. PURPOSE: This study determined the shear-bond strength of cementing agents to high-gold-content alloy castings and di ...

Influence of fibre position on the flexural properties and strain energy of a fibre-reinforced composite. 2003 Jul Ellakwa A, Shortall A, Marquis P. PubMed The introduction of laboratory-processed composite systems and fibre reinforcement techniques have increased the possibilities for the prosthetic replacement of missing tooth tissues. Laboratory fabrication variables may significantly influence the properties of the final prosthesis. During the construction of a fibre-reinforced bridge it ...

Influence of implant design and bone quality on stress/strain distribution in bone around implants: a 3-dimensional finite element analysis. 2003 May-Jun Tada S, Stegaroiu R, Kitamura E, Miyakawa O, Kusakari H. PubMed PURPOSE: A 3-dimensional finite element analysis was performed to evaluate the influence of implant type and length, as well as that of bone quality, on the stress/strain in bone and implant. MATERIALS AND METHODS: Two types (screw and cylinder) and 4 lengths (9.2, 10.8, 12.4, ...

Influence of implant length and bicortical anchorage on implant stress distribution. 2003 Pierrisnard L, Renouard F, Renault P, Barquins M. PubMed BACKGROUND: Short implants present superior failure rates for everybody. PURPOSE: The aim of this theoretic study was to assess to what extent implant length and bicortical anchorage affect the way stress is transferred to implant components, the implant proper, and the surrounding bone. MATERIALS AND METHODS: Stress analysis was performed using f ...

Influence of implant length and diameter on stress distribution: a finite element analysis. 2004 January Himmlova L, Dostalova T, Kacovsky A, Konvickova S. PubMed STATEMENT OF PROBLEM: Masticatory forces acting on dental implants can result in undesirable stress in adjacent bone, which in turn can cause bone defects and the eventual failure of implants. PURPOSE: A mathematical simulation of stress distribution around implants was used to determine which length and diameter of implants would ...

Influence of occlusal forces on stress distribution in preloaded dental implant screws. 2004 April Alkan I, Sertgoz A, Ekici B. PubMed STATEMENT OF PROBLEM: Abutment and prosthetic loosening of single and multiple screw-retained, implant-supported fixed partial dentures is a concern. PURPOSE: The purpose of this study was to investigate stress distribution of preloaded dental implant screws in 3 implant-to-abutment joint systems under simulated occlusal forces. MATERIAL AND METHODS: Three ab ...

Influence of superstructure materials on strain around an implant under 2 loading conditions: a technical investigation. Stegaroiu R, Khraisat A, Nomura S, Miyakawa O. 2004 Sep-Oct PubMed Division of Oral Health in Aging and Fixed Prosthodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. roxana@dent.niigata-u.ac.jp PURPOSE: This investigation was concerned with the effect of 3 superstructure materials on the strain ...

Influence of superstructure materials on strain around an implant under 2 loading conditions: a technical investigation. 2004 Sep-Oct Stegaroiu R, Khraisat A, Nomura S, Miyakawa O. PubMed PURPOSE: This investigation was concerned with the effect of 3 superstructure materials on the strain around an implant under static and nonimpact dynamic loading. MATERIALS AND METHODS: Five highly filled composite resin-veneered crown analogs, 5 autopolymerized acrylic resin-veneered crown analogs, and 5 ...

Mandibular strains induced by conventional and novel dental implants May 2004 Carvalho L.1; Vaz M.A.2; Simões J.A. ingentaconnect Abstract: This paper describes an experimental study that aimed at determining the mandibular strains provoked by impact loads on conventional and non-conventional dental implant systems. The novel implant differs from typical commercial designs because it comprises an elastomeric material barrier (stress shock absorber) interposed between the implant and an art ...

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Mechanical properties of dental restorative materials: relative contribution of laboratory tests September 2003 Linda Wang; Paulo Henrique Perlatti D'Alpino; Lawrence Gonzaga Lopes; José Carlos Pereira Journal of Applied Oral Science ABSTRACT A wide variety of dental products that are launched on the market becomes the correct selection of these materials a difficult task. Although the mechanical properties do not necessarily represent their actual clinical performance, they are used to gu ...

Mechanical response of bone under short-term loading of a dental implant with an internal layer simulating the nonlinear behaviour of the periodontal ligament. Genna F, Paganelli C, Salgarello S, Sapelli P. 2003 Oct-Dec PubMed Department of Civil Engineering, University of Brescia, Via Branze 38, Italy. genna@bscivgen.ing.unibs.it We consider a non-standard design for a fixed dental implant, incorporating a soft layer which simulates the presence of the periodontal ligament (PDL). Instead o ...

Mechanical stress generated by orthodontic forces on apical root cementum: a finite element model. 2004 May Shaw AM, Sameshima GT, Vu HV. PubMed OBJECTIVES: 1) To determine the mechanical stress generated at the root apex during different types of tooth movement using a finite element model of an ideal, human maxillary central incisor. 2) To determine the relationship of thickness of cementum and the magnitude of mechanical stress at the root apex. DESIGN: Computer simulation. SETTING AND SA ...

Mechanics of the tapered interference fit in dental implants. 2003 Nov Bozkaya D, Muftu S. PubMed In evaluation of the long-term success of a dental implant, the reliability and the stability of the implant-abutment interface plays a great role. Tapered interference fits provide a reliable connection method between the abutment and the implant. In this work, the mechanics of the tapered interference fits were analyzed using a closed-form formula and the finite element (FE) method. An analyti ...

Narrow-diameter implants as terminal support for occlusal three-unit FPDs: a biomechanical analysis. 2004 Dec Cehreli MC, Akca K. PubMed The purpose of this study was to examine force transmissions of narrow-diameter ITI implants when used as a terminal support for freestanding three-unit fixed partial dentures (FPD). Photoelastic and strain-gauged models of two 4.1-mm-diameter solid-screw implants; a 3.3-mm reduced-diameter implant and a 4.1-mm-diameter solid-screw implant; and a 3.3-mm-dia ...

Optimisation of the superplastic forming of a dental implant for bone augmentation using finite element simulations. 2004 Jun Garriga-Majo D, Paterson RJ, Curtis RV, Said R, Wood RD, Bonet J. PubMed OBJECTIVES: The phenomenon of superplasticity has made it possible to form complex shapes that require extremely high degrees of ductility in titanium alloy with minimal internal stresses. Combined with the use of an investment casting material as the die material, which makes possible the formin ...

Osseointegration under immediate loading: biomechanical stress-strain and bone formation--resorption. 2003 Kawahara H, Kawahara D, Hayakawa M, Tamai Y, Kuremoto T, Matsuda S. PubMed During the past 10 years, clinicians have used two-piece implants as a one-piece system for immediate loading to accomplish early recovery for function and esthetics. The statistical analysis by the Institute of Clinical Materials demonstrates high survival rates of 92.3 +/- 8.3%. Animal experiments of beagle dog ...

Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses Mar. 2004 Cristiane Ueda; Roberto Adrian Markarian; Cláudio Luiz Sendyk Dalva Cruz Laganá Brazilian Oral Research ABSTRACT The longevity of implant-supported prosthetic rehabilitation depends largely on how the masticatory forces are transferred to the implants and surrounding bone. Anatomical conditions, bone morphology and aesthetics usually dictate implant placement in les ...

Photoelastic stress analysis of implant-tooth connected prostheses with segmented and nonsegmented abutments. 2003 May Ochiai KT, Ozawa S, Caputo AA, Nishimura RD. PubMed STATEMENT OF PROBLEM: There is some question about whether implant abutment selection affects the transfer of load between connected implants and natural teeth. PURPOSE: The purpose of this study was to compare stress transfer patterns with either 1 or 2 posterior implants connected to a single anteriorly located simulated ...

Reliability of a digital image method for measuring medial mandibular flexure in dentate subjects Oct./Dec. 2004 Rosemary Sadami Arai Shinkai; Simone de Andrade Canabarro; Caroline Bom Schmidt; Evandro Afonso Sartori Journal of Applied Oral Science ABSTRACT Medial mandibular flexure (MMF) is the functional approximation of hemi-mandibles in jaw opening and protrusion, which may affect conventional or implant-supported arch prostheses. OBJECTIVE: This study evaluated the intra- and inter-r ...

Retention characteristics of attachment systems for implant overdentures. 2004 Dec Chung KH, Chung CY, Cagna DR, Cronin RJ Jr. PubMed PURPOSE: The aim of this study was to compare the retention characteristics of various overdenture attachment systems commonly used to retain overdentures to dental implants. MATERIALS AND METHODS: An edentulous mandibular model was constructed incorporating 2 parallel 4.0 mm x 13 mm Branemark implants placed in the canine regions. Attachments were embedded in ...

Stimulating effect of implant loading on surrounding bone. Comparison of three numerical models and validation by in vivo data. 2004 Apr Mellal A, Wiskott HW, Botsis J, Scherrer SS, Belser UC. PubMed A number of algorithms have been proposed to model the adaptive behavior of bone under load. However, the predictions of several models have neither been compared nor have they been systematically related to in vivo data. To this end, the stress states of loaded implant-bone interfaces were anal ...

Stress–strain response in human dentine: rethinking fracture predilection in postcore restored teeth 2003 Anil Kishen, Ganesh V. Kumar, Nah-Nah Chen Dental Traumatology Abstract In this study, the biomechanical perspective of fracture predilection in post-core restored teeth is investigated using computational, experimental, and fractographic analyses. The computational finite element analysis and the experimental tensile testing are used to evaluate the stress–strain response in structura ...

SUCCESSFUL OSSEOINTEGRATION AND IMPLANT SURFACES By: Melinda Mo DDS 2004 Date: March 6, 2003 Successful Osseointegration and Implant Surfaces Introduction: Osseointegration is the basis of a successful endosseous implant. The process itself is quite complex and there are many factors that influence the formation and maintenance of bone at the implant surface. What characteristics does an implant surface need to possess in order for success? To more fully understand what influences osseo ...

The effects of abutment taper, length and cement type on resistance to dislodgement of cement-retained, implant-supported restorations. 2003 Jun; Bernal G, Okamura M, Munoz CA. PubMed PURPOSE: The purpose of this study was to compare the effect of 20 degrees and 30 degrees of total occlusal convergence (TOC), the occlusocervical dimension, and the type of cement on the tensile resistance to dislodgement of cement-retained, implant-supported restorations. MATERIALS AND METHODS: Cylindrical pr ...

The influence of implant location and length on stress distribution for three-unit implant-supported posterior cantilever fixed partial dentures. 2004 March Yokoyama S, Wakabayashi N, Shiota M, Ohyama T. PubMed STATEMENT OF THE PROBLEM: The influence of implant location for an implant-supported cantilever fixed partial denture (FPD) on stress distribution in the bone has not been sufficiently assessed. PURPOSE: This study examined the influence of location and length of implants on stress di ...

The influence of occlusal loading location on stresses transferred to implant-supported prostheses and supporting bone: A three-dimensional finite element study. 2004 February Eskitascioglu G, Usumez A, Sevimay M, Soykan E, Unsal E. PubMed STATEMENT OF PROBLEM: Information about the influence of occlusal loading by location on the stress distribution in an implant-supported fixed partial denture and supporting bone tissue is limited. PURPOSE: The purpose of this study was to investigate the ...

The Stress & Strain Analysis in Implant Dentistry. The face of Dentistry has changed forever with the introduction of reliable dental implants, manufactured from pure titanium. These are surgically positioned to ensure that the material fuses correctly with the jawbone. Thereafter, these dental implants act as artificial tooth roots or alternatively can be used as anchors to retain dentures. When natural teeth are lost, the accompanying bone can also be affected through resorption. In ma ...

Three-dimensional finite element stress analysis of a cuneiform-geometry implant. 2003 Sep-Oct Cruz M, Wassall T, Toledo EM, Barra LP, Lemonge AC. PubMed PURPOSE: The biomechanical behavior of an osseointegrated dental implant plays an important role in its functional longevity inside the bone. Studies of this aspect of dental implants by the finite element method are ongoing. In the present study, a cuneiform-geometry implant was considered with a 3-dimensional model that had a mesh that wa ...