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External connection implant

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https://www.readbyqxmd.com/read/28072999/-features-and-advances-of-morse-taper-connection-in-oral-implant
#1
C L Tang, S K Zhao, C Huang
Dental implants have been widely accepted as a predictable and reliable tool for dental reconstruction with the development of the economy. The design of implant-abutment connections has influence on mechanical properties and biological characteristics of implants. There are two types of implant-abutment connections, the external and the internal connections. Morse taper connection is one of the internal connections and its conical shape creates significant friction via the high propensity of parallelism between the two structures within the joint space...
January 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28072807/occipital-nerve-stimulation-for-refractory-chronic-migraine-results-of-a-long-term-prospective-study
#2
Dolores Rodrigo, Pilar Acin, Pedro Bermejo
BACKGROUND: Refractory chronic migraine affects approximately 4% of the population worldwide and results in severe pain, lifestyle limitations, and decreased quality of life. Occipital nerve stimulation (ONS) refers to the electric stimulation of the distal branches of greater and lesser occipital nerves; the surgical technique has previously been described and has demonstrated efficacy in the treatment of a wide variety of headache disorders. OBJECTIVES: The aim of this study is to evaluate the long-term efficacy and tolerability of ONS for medically intractable chronic migraine...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28042449/stress-and-strain-distribution-in-three-different-mini-dental-implant-designs-using-in-implant-retained-overdenture-a-finite-element-analysis-study
#3
W Aunmeungtong, P Khongkhunthian, P Rungsiyakull
: Finite Element Analysis (FEA) has been used for prediction of stress and strain between dental implant components and bone in the implant design process. PURPOSE: Purpose of this study was to characterize and analyze stress and strain distribution occurring in bone and implants and to compare stress and strain of three different implant designs. MATERIALS AND METHODS: Three different mini dental implant designs were included in this study: 1...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28042437/efficacy-of-a-new-implant-abutment-connection-to-minimize-microbial-contamination-an-in-vitro-study
#4
G E Mancini, A B Gianni', F Cura, Z Ormanier, F Carinci
PURPOSE: The aim of the present study is to evaluate the effectiveness of Ditron implants abutment connection (IAC) to sealing the gap between two pieces. MATERIALS AND METHODS: To identify the efficacy of a new IAC, the passage of genetically modified bacteria across IAC was evaluated. A total of five Ditron Implants were used. All implants were immerged in a bacterial culture for forty-eight hours and then bacteria amount was measured inside and outside IAC with Real-time PCR...
July 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28042434/implant-abutment-leaking-of-replace-conical-connection-nobel-biocare-%C3%A2-implant-system-an-in-vitro-study-of-the-microbiological-penetration-from-external-environment-to-implant-abutment-space
#5
E El Haddad, A B Giannì, G E Mancini, F Cura, F Carinci
PURPOSE: The aim of our study is to value the microbial contamination in the implant-abutment connections (IAC) of a Nobel Replace Conical Connection implant system [Nobel Biocare®, Vimercate (MB), Italy]. MATERIALS AND METHODS: To identify the capability of the implant to protect the internal space from the external environment, the passage of genetically modified bacteria across IAC was evaluated. Four Nobel Replace Conical Connection implants (Nobel Biocare®, Vimercate (MB), Italy) were immerged in a bacterial culture for twenty-four hours and then bacteria amount was measured inside and outside IAC with Real-time PCR...
April 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28018564/evaluation-of-stability-of-interface-between-ccm-co-cr-mo-ucla-abutment-and-external-hex-implant
#6
Ki-Joon Yoon, Young-Bum Park, Hyunmin Choi, Youngsung Cho, Jae-Hoon Lee, Keun-Woo Lee
PURPOSE: The purpose of this study is to evaluate the stability of interface between Co-Cr-Mo (CCM) UCLA abutment and external hex implant. MATERIALS AND METHODS: Sixteen external hex implant fixtures were assigned to two groups (CCM and Gold group) and were embedded in molds using clear acrylic resin. Screw-retained prostheses were constructed using CCM UCLA abutment and Gold UCLA abutment. The external implant fixture and screw-retained prostheses were connected using abutment screws...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28018162/a-bidirectional-brain-machine-interface-featuring-a-neuromorphic-hardware-decoder
#7
Fabio Boi, Timoleon Moraitis, Vito De Feo, Francesco Diotalevi, Chiara Bartolozzi, Giacomo Indiveri, Alessandro Vato
Bidirectional brain-machine interfaces (BMIs) establish a two-way direct communication link between the brain and the external world. A decoder translates recorded neural activity into motor commands and an encoder delivers sensory information collected from the environment directly to the brain creating a closed-loop system. These two modules are typically integrated in bulky external devices. However, the clinical support of patients with severe motor and sensory deficits requires compact, low-power, and fully implantable systems that can decode neural signals to control external devices...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27987717/effect-of-different-types-of-prosthetic-platforms-on-stress-distribution-in-dental-implant-supported-prostheses
#8
Lurian Minatel, Fellippo Ramos Verri, Guilherme Abu Halawa Kudo, Daniel Augusto de Faria Almeida, Victor Eduardo de Souza Batista, Cleidiel Aparecido Araujo Lemos, Eduardo Piza Pellizzer, Joel Ferreira Santiago
A biomechanical analysis of different types of implant connections is relevant to clinical practice because it may impact the longevity of the rehabilitation treatment. Therefore, the objective of this study is to evaluate the Morse taper connections and the stress distribution of structures associated with the platform switching (PSW) concept. It will do this by obtaining data on the biomechanical behavior of the main structure in relation to the dental implant using the 3-dimensional finite element methodology...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27977814/clinical-evaluation-of-the-influence-of-connection-type-and-restoration-height-on-the-reliability-of-zirconia-abutments-a-retrospective-study-on-965-abutments-with-a-mean-6-year-follow-up
#9
Giacomo Fabbri, Mauro Fradeani, Gianluca Dellificorelli, Marco De Lorenzi, Fernando Zarone, Roberto Sorrentino
This multicenter retrospective clinical study aimed to evaluate the clinical performance of zirconia abutments in anterior and posterior regions, focusing on implant-abutment connections and restoration vertical height (RVH). Six experienced prosthodontists used 965 computer-aided design/computer-assisted manufacture zirconia abutments in 601 patients. Different surgical approaches were taken according to the needs of each patient. The final restorations were all-ceramic single crowns and short-span fixed dental prostheses...
January 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/27903476/rapid-aneurysmal-sac-expansion-following-endovascular-repair-of-a-dissecting-thoracoabdominal-aneurysm
#10
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 10-mm increase of the aorta was observed. A reentry 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 27, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27861666/internal-vs-external-connection-single-implants-a-retrospective-study-in-an-italian-population-treated-by-certified-prosthodontists
#11
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
https://www.readbyqxmd.com/read/27859976/fatigue-failure-of-narrow-implants-with-different-implant-abutment-connection-designs
#12
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
https://www.readbyqxmd.com/read/27826389/influence-of-the-connection-design-and-titanium-grades-of-the-implant-complex-on-resistance-under-static-loading
#13
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
https://www.readbyqxmd.com/read/27825979/functional-circuit-mapping-of-striatal-output-nuclei-using-simultaneous-deep-brain-stimulation-and-fmri
#14
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
https://www.readbyqxmd.com/read/27825365/a-prospective-case-series-for-a-minimally-invasive-internal-fixation-device-for-anterior-pelvic-ring-fractures
#15
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
https://www.readbyqxmd.com/read/27819651/endoscopic-assisted-cochlear-implantation-a-case-series
#16
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
https://www.readbyqxmd.com/read/27740643/the-impact-of-conical-and-nonconical-abutments-on-bacterial-infiltration-at-the-implant-abutment-interface
#17
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
https://www.readbyqxmd.com/read/27725367/influence-of-eccentric-cyclic-loading-on-implant-components-comparison-between-external-joint-system-and-internal-joint-system
#18
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
https://www.readbyqxmd.com/read/27680671/survival-and-failure-modes-platform-switching-for-internal-and-external-hexagon-cemented-fixed-dental-prostheses
#19
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
https://www.readbyqxmd.com/read/27632273/the-influence-of-crown-to-implant-ratio-on-short-implant-marginal-bone-loss
#20
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
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