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dental implant neck design

Wenzhi Niu, Penglai Wang, Shaoyue Zhu, Zongxiang Liu, Ping Ji
STATEMENT OF PROBLEM: Whether microthreads in the crestal portion can reduce the amount of marginal bone loss (MBL) around implants has not yet been determined. PURPOSE: The purpose of this systematic review was to investigate the marginal bone loss around dental implants with and without microthreads in the neck. MATERIAL AND METHODS: This review was based on the PRISMA guidelines. An electronic search with no restrictions on language was performed from inception to August 19, 2015, in PubMed, Cochrane Central Register of Controlled Trials, EMBASE, Web of Sciences, and AMED (Ovid) databases...
September 16, 2016: Journal of Prosthetic Dentistry
Roodabeh Koodaryan, Ali Hafezeqoran
Background. It is important to understand the influence of different collar designs on peri-implant marginal bone loss, especially in the critical area. Objectives. The purpose of the present systematic review and meta-analysis was to compare dental implants with different collar surfaces, evaluating marginal bone loss and survival rates of implants. Methods. Eligibility criteria included clinical human studies, randomized controlled trials, and prospective and retrospective studies, which evaluated dental implants with different collar surface in the same study...
2016: BioMed Research International
Marco Esposito, Hassan Maghaireh, Roberto Pistilli, Maria Gabriella Grusovin, Sang Taek Lee, Anna Trullenque-Eriksson, Federico Gualini
PURPOSE: To evaluate advantages and disadvantages of identical implants with internal or external connections. MATERIALS AND METHODS: One hundred and twenty patients with any type of edentulism (single tooth, partial and total edentulism), requiring one implant-supported prosthesis were randomly allocated in two equal groups to receive either implants with an external connection (EC) or implants of the same type with an internal connection (IC) (EZ Plus, MegaGen Implant, Gyeongbuk, South Korea), at four centres...
2016: European Journal of Oral Implantology
Yung-Chang Cheng, Deng-Huei Lin, Cho-Pei Jiang
This paper introduces the application of uniform experimental design to improve dental implant systems subjected to dynamic loads. The dynamic micromotion of the Zimmer dental implant system is calculated and illustrated by explicit dynamic finite element analysis. Endogenous and exogenous factors influence the success rate of dental implant systems. Endogenous factors include: bone density, cortical bone thickness and osseointegration. Exogenous factors include: thread pitch, thread depth, diameter of implant neck and body size...
2015: Bio-medical Materials and Engineering
Wei Geng, Changying Liu, Yucheng Su, Jun Li, Yanmin Zhou
PURPOSE: To evaluate the clinical outcomes of implants placed using different types of computer-aided design/computer-aided manufacturing (CAD/CAM) surgical guides, including partially guided and totally guided templates, and determine the accuracy of these guides Materials and methods: In total, 111 implants were placed in 24 patients using CAD/CAM surgical guides. After implant insertion, the positions and angulations of the placed implants relative to those of the planned ones were determined using special software that matched pre- and postoperative computed tomography (CT) images, and deviations were calculated and compared between the different guides and templates...
2015: International Journal of Clinical and Experimental Medicine
Deborah Stona, Luiz Henrique Burnett, Eduardo Gonçalves Mota, Ana Maria Spohr
BACKGROUND: Because no information was found in the dental literature regarding the fracture resistance of all-ceramic crowns using CEREC (Sirona) computer-aided design and computer-aided manufacturing (CAD-CAM) system on solid abutments, the authors conducted a study. METHODS: Sixty synOcta (Straumann) implant replicas and regular neck solid abutments were embedded in acrylic resin and randomly assigned (n = 20 per group). Three types of ceramics were used: feldspathic, CEREC VITABLOCS Mark II (VITA); leucite, IPS Empress CAD (Ivoclar Vivadent); and lithium disilicate, IPS e...
July 2015: Journal of the American Dental Association
Nilüfer Bölükbaşı, Sinem Yeniyol
Resorption following tooth loss and poor bone quality affect the success of implants in the anterior maxilla. Inappropriate planning can cause implant loss and aesthetics problems that are difficult to resolve. There is a limited literature on the optimum number and location of implants in anterior maxilla for fabricating fixed prosthesis in biomechanical terms. This study investigated the effect of dental implant localizations in anterior maxilla on the strain values around implants using a three dimensional finite elements analysis method...
April 2015: Medical Engineering & Physics
Xu Yan, Xinwen Zhang, Weichao Chi, Hongjun Ai, Lin Wu
The aim of the present study was to evaluate the effect of the association between the implant apex and the sinus floor in posterior maxilla dental implantation by means of three-dimensional (3D) finite element (FE) analysis. Ten 3D FE models of a posterior maxillary region with a sinus membrane and different heights of alveolar ridge with different thicknesses of sinus floor cortical bone were constructed according to anatomical data of the sinus area. Six models were constructed with the same thickness of crestal cortical bone and a 1-mm thick sinus floor cortical bone, but differing heights of alveolar ridge (between 10 and 14 mm)...
March 2015: Experimental and Therapeutic Medicine
Xiaona Li, Rudi Van Staden, Guan Hong
OBJECTIVE: To evaluate the influence of shape of four different short implants on the stress characteristics of jaw bone around implants in the posterior maxilla. METHODS: Finite element models of the jaw bone and crown were established based on computed tomography (CT) data and implant geometries were obtained from manufacturers' catalogues. The whole models included jaw bone, four different short implants (A: torpedo-shape implant with fin threads; B: taper implant with triangle threads; C: cylindrical implant with fine threads; D:cylindrical implant with sparse threads), implant abutments, abutment screws and crowns...
November 2014: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Xu Yan, Xinwen Zhang, Weichao Chi, Hongjun Ai, Lin Wu
OBJECTIVE: This study aimed to compare the influence of alveolar ridge cortical bone and sinus floor cortical bone in sinus areabi-cortical dental implantation by means of 3D finite element analysis. MATERIALS AND METHODS: Three-dimensional finite element (FE) models in a posterior maxillary region with sinus membrane and the same height of alveolar ridge of 10 mm were generated according to the anatomical data of the sinus area. They were either with fixed thickness of crestal cortical bone and variable thickness of sinus floor cortical bone or vice versa...
May 2015: Acta Odontologica Scandinavica
Thiyaneswaran Nesappan, Padma Ariga
PURPOSE: This study was formulated to evaluate and compare stresses around endosseous implants in various normal and fibula reconstructed mandibular models using finite element analysis method. MATERIALS AND METHODS: CT scan data of a completely edentulous patient and a fibula reconstructed patient was made and the Dicom images were used to design 3-D mandibular models using software. Based on the information from the scan data, various types of reconstructed FEA models were made...
August 2014: Journal of Clinical and Diagnostic Research: JCDR
Ivan Tanasić, Ljiljana Tihacek-Sojić, Aleksandra Milić-Lemić
This study analyzed the influence of platform switching on the stress/strain distribution of vertically loaded implants. Employing finite element analysis, the aim of this study was to determine the distribution of stresses and strains generated by a simulated vertical load on different implant models positioned in the molar region with respect to changes of implant design and biomechanics. Two different implant designs, one with and one without platform switching, with the same length (11.5 mm) and diameter of (3...
2014: International Journal of Computerized Dentistry
Zoran Vlahovic, Aleksa Markovic, Mileta Golubovic, Miodrag Scepanovic, Milena Kalanovic, Ana Djinic
AIM: The aim of this study was comparing the effect of flapless vs. flap technique of implant placement on inflammation degree of peri-implant soft tissue, through histopathological analysis. METHOD: The experiment was conducted on five domestic pigs. Nine weeks after tooth extraction, implants were installed. Each animal received six implants in mandible. According to split-mouth design, randomly one side was used for flapless technique using mini-incision, while on the other side, flap was raised...
November 2015: Clinical Oral Implants Research
Pedro Hernández-Cortés, Alberto Monje, Pablo Galindo-Moreno, Andrés Catena, Inmaculada Ortega-Oller, José Salas-Pérez, Francisco Mesa, Rafael Gómez-Sánchez, Mariano Aguilar, David Aguilar, Francisco O'Valle
OBJECTIVE: This study was designed to explore relationships of resonance frequency analysis (RFA)-assessed implant stability (ISQ values) with bone morphometric parameters and bone quality in an ex vivo model of dental implants placed in human femoral heads and to evaluate the usefulness of this model for dental implant studies. MATERIAL AND METHODS: This ex vivo study included femoral heads from 17 patients undergoing surgery for femoral neck fracture due to osteoporosis (OP) (n = 7) or for total prosthesis joint replacement due to severe hip osteoarthrosis (OA) (n = 10)...
2014: BioMed Research International
Reza Shahmiri, Raj Das, John M Aarts, Vincent Bennani
STATEMENT OF PROBLEM: When implants are incorporated into an existing partial removable dental prosthesis, the acrylic resin base can fracture. It is therefore essential to study the mechanical behavior of partial removable dental prostheses by using stress and deformation analysis. PURPOSE: The purpose of this study was to analyze the effect of the occlusal rest position on the implant-assisted partial removable dental prosthesis by finite element analysis. MATERIAL AND METHODS: A Faro Arm scan was used to extract the geometrical data of a human partially edentulous mandible...
November 2014: Journal of Prosthetic Dentistry
Alessandro Pozzi, Marco Tallarico, Peter K Moy
PURPOSE: To compare the clinical and radiological outcomes of two implant designs with different prosthetic interfaces and neck configurations. MATERIALS AND METHODS: Thirty-four partially edentate patients randomly received at least one NobelActive implant (Nobel Biocare, Göteborg, Sweden) with back-tapered collar, internal conical connection and platform shifting design, and one NobelSpeedy implant (Nobel Biocare) with external hexagon and flat-to-flat implant-abutment interface according to a split-mouth design...
2014: European Journal of Oral Implantology
I-Chiang Chou, Shyh-Yuan Lee, Cho-Pei Jiang
This study investigates the effect of implant neck design on primary stability and overload using 3D finite element analysis. Four commercial dental implants and mandibular segments are created. Various parameters including the osseointegration condition (non-osseointegration and full osseointegration), force direction (vertical and horizontal), and cortical bone thickness (Tc = 0.3, 0.5, and 1 mm) are considered. The vertical and horizontal forces, 500 N and 250 N, are statically applied at the top of the platform, respectively...
November 2014: International Journal for Numerical Methods in Biomedical Engineering
José Luis Calvo-Guirado, Patricia Jara López-López, José Eduardo Maté Sánchez de Val, Javier Mareque-Bueno, Rafael Arcesio Delgado-Ruiz, Georgios E Romanos
PURPOSE: The study aims to assess the soft tissue level (STL) and crestal bone level (CBL), of titanium dental implants with different mixed collar abutments configurations. MATERIALS AND METHODS: This study included 48 implants with the same dimensions. They were divided into two groups of 24 implants each one: implants with a polished collar of 2 mm plus a roughened area of 0.8 mm (CONTROL) and implants with a polished collar of 0.8 mm plus a micro-threated and roughened area of 2 mm (TEST)...
July 2015: Clinical Oral Implants Research
Rudi C van Staden, Xiaona Li, Hong Guan, Newell W Johnson, Peter Reher, Yew-Chaye Loo
PURPOSE: Elevated bite forces and reduced bone densities and dimensions associated with posterior regions of the maxilla cause relatively high failure rates when short dental implants are placed to substitute missing teeth. This study uses the finite element method to evaluate four distinctly different short implant designs (Bicon, Neodent, Nobel Biocare, and Straumann) for their influences on the von Mises stress characteristics within the posterior maxilla. MATERIALS AND METHODS: Finite element models of the supporting bone and tooth crowns are developed based on computed tomography data, and implant geometries are obtained from manufacturers' catalogs...
March 2014: International Journal of Oral & Maxillofacial Implants
Yeliz Cavusoglu, Kıvanç Akça, Rıza Gürbüz, Murat Cavit Cehreli
PURPOSE: To compare the interfaces of loaded and unloaded zirconium and titanium abutments with titanium implants using scanning electron microscopy (SEM). MATERIALS AND METHODS: Zirconium and titanium abutments (n = 5 per group; four test and one control) were torque-tightened into titanium implants secured into metal blocks, and computer-aided design/computer-assisted manufacture-based zirconium oxide copings were fabricated and cemented to the abutments with temporary resin-based cement...
March 2014: International Journal of Oral & Maxillofacial Implants
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