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https://www.readbyqxmd.com/read/28321800/wear-of-morse-taper-and-external-hexagon-implant-joints-after-abutment-removal
#1
Abraão M Prado, Jorge Pereira, Filipe S Silva, Bruno Henriques, Rubens M Nascimento, Cesar A M Benfatti, José López-López, Júlio C M Souza
The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28296983/comparing-the-fracture-resistance-of-alternatively-engineered-zirconia-abutments-with-original-equipment-manufactured-abutments-with-different-implant-connection-designs
#2
Joseph M Jarman, Techkouhie Hamalian, Anthony P Randi
PURPOSE: Aftermarket computer-aided design/computer-assisted manufacture (CAD/CAM) milled zirconia (Zr) abutments were recently introduced with minimal independent research regarding their fracture resistance. Third-party manufacturers often alter the original equipment manufacturers' (OEM) design with unknown effects on fracture resistance. These alterations include elimination of the titanium insert with subsequent introduction of Zr into the implant, changes to connection designs and shapes, and/or alterations to prosthetic screw design...
March 15, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28268710/inductive-passive-sensor-for-intraparenchymal-and-intraventricular-monitoring-of-intracranial-pressure
#3
Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy
Accurate measurement of intracranial hypertension is crucial for the management of elevated intracranial pressure (ICP). Catheter-based intraventricular ICP measurement is regarded as the gold standard for accurate ICP monitoring. However, this method is invasive, time-limited, and associated with complications. In this paper, we propose an implantable passive sensor that could be used for continuous intraparenchymal and intraventricular ICP monitoring. Moreover, the sensor can be placed simultaneously along with a cerebrospinal fluid shunt system in order to monitor its function...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28248689/microleakage-at-different-implant-abutment-connections-under-unloaded-and-loaded-conditions
#4
João Paulo da Silva-Neto, Marcel Santana Prudente, Talita Souza Dantas, Plinio Mendes Senna, Ricardo Faria Ribeiro, Flávio Domingues das Neves
PURPOSE: This study evaluated the microleakage at different implant-abutment (I-A) connections under unloaded and loaded conditions. MATERIALS AND METHODS: Forty implants, specially designed with an opening at the apex, were grouped according to the I-A and screw device: external hexagon implants with titanium (EH) or EH diamond-like carbon screws fixing the abutment; internal hexagon implants with titanium screws (IH); and Morse taper implants with solid (MT) or MT passing screws (MTps) abutments...
February 28, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28226898/inductive-passive-sensor-for-intraparenchymal-and-intraventricular-monitoring-of-intracranial-pressure
#5
Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy, Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy, Lauri Sydanheimo, Aaron J Fleischman, Leena Ukkonen, Mohammad H Behfar, Nalin Gupta, Shuvo Roy, Ken Goldman, Emily Abada
Accurate measurement of intracranial hypertension is crucial for the management of elevated intracranial pressure (ICP). Catheter-based intraventricular ICP measurement is regarded as the gold standard for accurate ICP monitoring. However, this method is invasive, time-limited, and associated with complications. In this paper, we propose an implantable passive sensor that could be used for continuous intraparenchymal and intraventricular ICP monitoring. Moreover, the sensor can be placed simultaneously along with a cerebrospinal fluid shunt system in order to monitor its function...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28210535/magnetic-resonance-imaging-in-a-neurofibromatosis-type-2-patient-with-a-novel-mri-compatible-auditory-brainstem-implant
#6
REVIEW
Matthew Shew, Judson Bertsch, Paul Camarata, Hinrich Staecker
Auditory brainstem implantation has become a key technique for the rehabilitation of hearing in patients with neurofibromatosis type 2. The nature of this devastating genetic disease requires ongoing MRI for the patient's lifespan. Today, most auditory brainstem implants require removal of the magnet that connects the internal device to the external speech processor to undergo imaging as their disease progresses. Patients have the option of having a short procedure to have the magnet taken out and replaced each time, or alternately using a headband to secure the processor over the receiver coil of the internal device...
January 2017: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/28185373/dual-anchor-internal-pulse-generator-technique-may-lower-risk-of-twiddler-s-syndrome-a-case-series-and-literature-review
#7
Michał Roman Sobstyl, Mirosław Ząbek, Grażyna Brzuszkiewicz-Kuźmicka, Tomasz Pasterski
BACKGROUND: Twiddler's syndrome (TS) is described as a spontaneous rotation or intentional external manipulation of implanted internal pulse generator (IPG) for neurological or cardiac disorders. There have been identified some predisposing factors of the development of TS such as: loose subcutaneous tissue, older age of individuals undergoing deep brain stimulation (DBS) procedures, creation of too large pockets for IPG. Apart from these factors, the construction of IPG itself may predispose to the development of TS...
February 9, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28156208/image-guided-intrathecal-baclofen-pump-catheter-implantation-a-technical-note-and-case-series
#8
Shenandoah Robinson, Faith C Robertson, Hormuzdiyar H Dasenbrock, Cormac P O'Brien, Charles Berde, Horacio Padua
OBJECTIVE Medically refractory spasticity and dystonia are often alleviated with intrathecal baclofen (ITB) administration through an indwelling catheter inserted in the lumbar spine. In patients with cerebral palsy, however, there is a high incidence of concomitant neuromuscular scoliosis. ITB placement may be technically challenging in those who have severe spinal deformity or who have undergone prior instrumented thoracolumbar fusion. Although prior reports have described drilling through the lumbar fusion mass with a high-speed bur, as well as IT catheter implantation at the foramen magnum or cervical spine, these approaches have notable limitations...
February 3, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28132830/flexible-near-field-wireless-optoelectronics-as-subdermal-implants-for-broad-applications-in-optogenetics
#9
Gunchul Shin, Adrian M Gomez, Ream Al-Hasani, Yu Ra Jeong, Jeonghyun Kim, Zhaoqian Xie, Anthony Banks, Seung Min Lee, Sang Youn Han, Chul Jong Yoo, Jong-Lam Lee, Seung Hee Lee, Jonas Kurniawan, Jacob Tureb, Zhongzhu Guo, Jangyeol Yoon, Sung-Il Park, Sang Yun Bang, Yoonho Nam, Marie C Walicki, Vijay K Samineni, Aaron D Mickle, Kunhyuk Lee, Seung Yun Heo, Jordan G McCall, Taisong Pan, Liang Wang, Xue Feng, Tae-Il Kim, Jong Kyu Kim, Yuhang Li, Yonggang Huang, Robert W Gereau, Jeong Sook Ha, Michael R Bruchas, John A Rogers
In vivo optogenetics provides unique, powerful capabilities in the dissection of neural circuits implicated in neuropsychiatric disorders. Conventional hardware for such studies, however, physically tethers the experimental animal to an external light source, limiting the range of possible experiments. Emerging wireless options offer important capabilities that avoid some of these limitations, but the current size, bulk, weight, and wireless area of coverage is often disadvantageous. Here, we present a simple but powerful setup based on wireless, near-field power transfer and miniaturized, thin, flexible optoelectronic implants, for complete optical control in a variety of behavioral paradigms...
February 8, 2017: Neuron
https://www.readbyqxmd.com/read/28072999/-features-and-advances-of-morse-taper-connection-in-oral-implant
#10
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
#11
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
#12
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. a mini dental implant with an internal implant-abutment connection (MDIi); 2...
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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...
February 2017: 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
#20
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
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