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External connection implant

Pau Bargay-Juan, Teresa Martin-Gonzalez, Rachel Clough, Rafaëlle Spear, Jonathan Sobocinski, Stephan Haulon
Endovascular repair of dissecting thoracoabdominal aneurysms (TAAA) is challenging and often requires multiple procedures. A 61-year-old man with a dissecting type-II TAAA treated first by placement of a thoracic endograft, and subsequently implantation of a fenestrated endograft. Six months postoperatively, a 10mm increase of the aorta was observed. A re-entry tear in left external iliac artery(EIA) was perfusing the false lumen in a retrograde fashion connecting with the endoleak caused by the inferior mesenteric artery and lumbar arteries...
November 26, 2016: Annals of Vascular Surgery
Paolo Vigolo, Stefano Gracis, Fabio Carboncini, Sabrina Mutinelli
PURPOSE: The design of an implant connection that allows prosthetic suprastructures to be attached to implants has long been debated in the dental literature. The goal of this retrospective study was to evaluate the 5-year clinical results for a large number of single implants restored by certified prosthodontists in an attempt to establish whether different clinical outcomes could be detected for external- or internal-connection implants. MATERIALS AND METHODS: All single implants with internal or external connections inserted in 27 private dental practices from January 1, 2003 to December 31, 2007 were evaluated...
November 2016: International Journal of Oral & Maxillofacial Implants
Dimorvan Bordin, Lukasz Witek, Vinícius P Fardin, Estevam A Bonfante, Paulo G Coelho
PURPOSE: To evaluate the reliability of narrow diameter dental implants (NDIs) with similar macrogeometry and 3 implant-abutment connection designs. MATERIALS AND METHODS: Eighty-four NDIs (3.5 × 10 mm) were selected and divided into 4 groups (n = 21/group) according to implant-abutment connection design, as follows: EH - external hexagon, IH - internal hexagon, IC - internal conical, and IC-M - internal conical connected to a monolithic titanium abutment. Identical abutments were torqued to the implants, and standardized maxillary incisor crowns were cemented and subjected to step-stress accelerated life testing (SSALT) in water...
November 18, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Su-Jung Park, Suk-Won Lee, Richard Leesungbok, Su-Jin Ahn
PURPOSE: The purpose of this study was to evaluate the resistance to deformation under static overloading by measuring yield and fracture strength, and to analyze the failure characteristics of implant assemblies made of different titanium grades and connections. MATERIALS AND METHODS: Six groups of implant assemblies were fabricated according to ISO 14801 (n=10). These consisted of the combinations of 3 platform connections (external, internal, and morse tapered) and 2 materials (titanium grade 2 and titanium grade 4)...
October 2016: Journal of Advanced Prosthodontics
Nathalie Van Den Berge, Daniel L Albaugh, Andrew Salzwedel, Christian Vanhove, Roel Van Holen, Wei Gao, Garret D Stuber, Yen-Yu Ian Shih
The substantia nigra pars reticulata (SNr) and external globus pallidus (GPe) constitute the two major output targets of the rodent striatum. Both the SNr and GPe converge upon thalamic relay nuclei (directly or indirectly, respectively), and are traditionally modeled as functionally antagonistic relay inputs. However, recent anatomical and functional studies have identified unanticipated circuit connectivity in both the SNr and GPe, demonstrating their potential as far more than relay nuclei. In the present study, we employed simultaneous deep brain stimulation and functional magnetic resonance imaging (DBS-fMRI) with cerebral blood volume (CBV) measurements to functionally and unbiasedly map the circuit- and network level connectivity of the SNr and GPe...
November 5, 2016: NeuroImage
Wayne Hoskins, Andrew Bucknill, James Wong, Edward Britton, Rodney Judson, Kellie Gumm, Roselyn Santos, Rohan Sheehy, Xavier Griffin
BACKGROUND: External fixation is commonly used as a means of definitive fixation of pelvic fractures. Pin site infection is common, with some cases of osteomyelitis and inpatient nursing can be challenging. The aim of this study is to report the outcomes and complications of an alternative minimally invasive technique, known as INFIX, utilising spinal pedicle screws inserted into the supra-acetabular bone and connected by a subcutaneous rod. METHODS: A single-centre prospective case series was performed...
November 8, 2016: Journal of Orthopaedic Surgery and Research
Kadir Serkan Orhan, Beldan Polat, Mehmet Çelik, Şenol Çomoğlu, Yahya Güldiken
The aim of the present study was to describe the use of the endoscopic-assisted cochlear implantation in cases with an unsuccessful standard surgical technique because of not achieving adequate exposure to the round window (RW). Three patients with a bilateral profound hearing loss were operated using an endoscopic-assisted cochlear implant procedure at our tertiary university referral center between 2012 and 2014. In all of the patients, a retroauricular "c" shaped incision was performed and a subperiosteal pocket was created...
November 7, 2016: Journal of International Advanced Otology
Elen Guerra, Cristiane Pereira, Renata Faria, Antonio Olavo Jorge, Marco Antonio Bottino, Renata Marques de Melo
This study evaluated the in vitro bacterial microleakage at the implant-abutment interface of three prosthetic connections: external (EH) and internal hexagon (IH) and taper connection (TC: solid [ST], taper with internal hexagon [IT], and short taper [OT]). Escherichia coli (E coli) and Streptococcus sanguinis (S sanguinus) were inoculated in the apical portion of the abutment screw, which was immersed in sterile brain-heart infusion broth for 14 days. There were no differences between the percentages of bacterial infiltration for IH (9...
November 2016: International Journal of Periodontics & Restorative Dentistry
Kei Sakamoto, Shinya Homma, Takuya Takanashi, Shinji Takemoto, Yoshitaka Furuya, Masao Yoshinari, Yasutomo Yajima
The purpose of this in vitro study was to investigate the influence of eccentric loading on implant components by measuring screw loosening and observing these components under several load positions and magnitudes. The external and internal joint system implants with butt joint connection were subjected to cyclic loading tests according to the specifications of ISO 14801. Load position was set at 0, 4, or 8 mm, and load was set at 100 or 300 N. On the external joint system, the reverse torque values decreased with distal shift in the loading position and an increase in magnitude of load, and abrasion and deformation on the anti-rotation device were observed...
December 1, 2016: Dental Materials Journal
Rodolfo B Anchieta, Lucas S Machado, Ronaldo Hirata, Paulo G Coelho, Estevam A Bonfante
This study evaluated the probability of survival (reliability) of platform-switched fixed dental prostheses (FDPs) cemented on different implant-abutment connection designs. Eighty-four-three-unit FDPs (molar pontic) were cemented on abutments connected to two implants of external or internal hexagon connection. Four groups (n = 21 each) were established: external hexagon connection and regular platform (ERC); external hexagon connection and switched platform (ESC); internal hexagon and regular platform (IRC); and internal hexagon and switched platform (ISC)...
October 2016: European Journal of Oral Sciences
Mariana Nunes, Ricardo Faria Almeida, Antonio Campos Felino, Paulo Malo, Miguel de Araújo Nobre
PURPOSE: There is a need for more studies evaluating the marginal bone loss (MBL) of rehabilitations in the posterior regions of extremely resorbed maxillae and mandibles supported by short-length dental implants with a high crown/implant ratio (C/I-R). The aim of this study was to evaluate the influence of the C/I-R in implants on MBL considering dental implants with 4 mm of width and 7 mm of length. MATERIALS AND METHODS: This retrospective cohort study included 59 patients (mean age of 52...
September 2016: International Journal of Oral & Maxillofacial Implants
Gianguido Cossellu, Valeria Motta, Laura Dioni, Laura Angelici, Luisella Vigna, Giampietro Farronato, Angela Cecilia Pesatori, Valentina Bollati
OBJECTIVES: In this study on 90 individuals we aimed at evaluating the microRNAs (miRNAs) expression profile associated with personal levels of Titanium (Ti) and Zirconium (Zr) traced in hair samples. Ti and Zr materials are broadly used for dental implants but the biological reactions triggered by a long term presence of these materials in the oral cavity still need to be assessed. MiRNAs are mechanisms that need to be investigated as they play a fundamental role in the control of gene expression following external stimuli and contribute to a wide range of pathophysiological processes...
2016: PloS One
Young-Gun Shin, So-Yun Kim, Ho-Kyu Lee, Chang-Mo Jeong, So-Hyoun Lee, Jung-Bo Huh
PURPOSE: This study was conducted to assess the effect of using a double screw on the prevention of abutment screw loosening. MATERIALS AND METHODS: Internal connected abutment with a single screw (IS), internal connected abutment with a double screw (ID), external connected abutment with a single screw (ES), and external connected abutment with a double screw (ED) groups were prepared (n = 10 in each group). After 50,000 loading cycles, postload removal torque loss (RTL) percentage was measured...
September 2016: International Journal of Prosthodontics
Seong Min Kang, Keun Her, Seong Wook Choi
BACKGROUND: In this study, a new algorithm was developed for estimating the pump outflow of a pneumatic ventricular assist device (p-VAD). The pump outflow estimation algorithm was derived from the ideal gas equation and determined the change in blood-sac volume of a p-VAD using two external pressure sensors. OBJECTIVES: Based on in vitro experiments, the algorithm was revised to consider the effects of structural compliance caused by volume changes in an implanted unit, an air driveline, and the pressure difference between the sensors and the implanted unit...
2016: Biomedical Engineering Online
F Carinci, D Lauritano, F Cura, M A Lopez, M Andreasi Bassi, L Confalone, F Pezzetti
Peri-implantitis is the main cause of implant failures. Peri-implantitis is provoked by the presence of bacterial infiltration around Implant-Abutment Connection (IAC). Reduction of bacterial leakage may be achieved by improving the accuracy and precision of the two pieces of IAC. The aim of the present in vitro study was to evaluate bacterial microleakage from the inside to the outside of the IAC, testing the efficacy of three new designs of internal conical connection (FN - nano-fix -, NQ - uNiQo - and Elisir implant systems by FMD, Rome, Italy)...
April 2016: Journal of Biological Regulators and Homeostatic Agents
Guilherme Oliveira, Luiz Antà Nio Borelli Barros-Filho, Luiz Antà Nio Borelli Barros, Thallita Pereira Queiroz, Elcio Marcantonio
The objective of this study was to evaluate the primary stability of short and conventional dental implants with different platform types at different site densities in vitro. One hundred and twenty implants were placed in polyurethane blocks that simulate different bone densities (bone type I and IV). The implants were divided into 10 groups with 12 implants each according to the type of prosthetic connections (external hexagon-EH, and morse taper-MT) and size of the implants (conventional 4x10 mm and short 5x5 mm; 5...
July 25, 2016: Journal of Oral Implantology
Anja Zembic
ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Performance of zirconia abutments for implant-supported single-tooth crowns in esthetic areas: a retrospective study up to 12-year follow-up. Passos SP, Linke B, Larjava H, French D. Clin Oral Implants Res 2016;27(1):47-54. SOURCE OF FUNDING: Information not available TYPE OF STUDY/DESIGN: Retrospective cohort study.
June 2016: Journal of Evidence-based Dental Practice
Camila Lima de Andrade, Marco Aurélio Carvalho, Altair Antoninha Del Bel Cury, Bruno Salles Sotto-Maior
PURPOSE: Dental implant macrogeometry parameters, such as the prosthetic connection and implant body shape, can influence the biomechanical behavior of the restoration. Using tridimensional finite element analysis (3D-FEA), this study evaluated the biomechanical behavior of two implant macrodesign parameters (prosthetic connection and implant body shape) in low-quality bone. MATERIALS AND METHODS: Four groups were obtained by the combination of external hexagon and Morse taper connections, and cylindrical and conical body shapes...
July 2016: International Journal of Oral & Maxillofacial Implants
Ravel M Sousa, Paulo Cézar Simamoto-Junior, Alfredo Júlio Fernandes-Neto, Jos Vander Sloten, Siegfried Vn Jaecques, Roberto S Pessoa
PURPOSE: To evaluate the influence of different implant numbers and connection types on the biomechanical behavior of mandibular full-arch implant-supported rehabilitation. MATERIALS AND METHODS: Computed tomography-based finite element models comprising a totally edentulous mandible and 3.8 × 13-mmdiameter implants, abutments, abutment screws, bar retaining screw, and bar were constructed. Different implant numbers (three, four, and five implants) and loading conditions (symmetrical/balanced, unilateral, and posterior with diverse loading magnitudes) were simulated for both external hex and Morse-taper connections...
July 2016: International Journal of Oral & Maxillofacial Implants
Alexandre Ricardo Dal Molin Molinari, Cesar Augusto Thomé, Luis Mauro Moura, Sung Hyun Kim
STATEMENT OF PROBLEM: Several studies have demonstrated the harmful role of heat generation during implant site drilling in subsequent bone healing. However, heat generation during implant placement should also be carefully considered. PURPOSE: The purpose of this in vitro study was to evaluate thermal change in a resin block during motorized and manual implant placement with and without saline irrigation. MATERIAL AND METHODS: Thermocouple probes were placed in resin blocks to measure the thermal change during forty 3...
July 13, 2016: Journal of Prosthetic Dentistry
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