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Implant connection

Francesco Mangano, Alberta Greco Lucchina, Matteo Brucoli, Mario Migliario, Carmen Mortellaro, Carlo Mangano
PURPOSE: To evaluate the long-term cumulative implant survival rate (CISR%) and cumulative implant-crown success rate (CICSR%) of single-tooth Morse-taper connection implants, with particular attention to documenting the incidence of prosthetic complications. METHODS: The customized records of all patients who had been treated with single-tooth Morse-taper connection implants in 2 dental centers during the period between January 2002 and December 2012 were revisited...
March 20, 2018: Journal of Craniofacial Surgery
Wolfram Wiest, Alexander Rack, Simon Zabler, Alex Schaer, Michael Swain, Katja Nelson
State-of-the art, two-piece dental implants made from titanium alloys exhibit a complex micromechanical behavior under dynamical load. Its understanding, especially the formation of microgaps, is of crucial importance in order to predict and improve the long-term performance of such implants. Microgap formation in a loaded dental implant with a conical implant-abutment connection can be studied and quantified by synchrotron radiography with micrometer accuracy. Due to the high costs and limited access to synchrotron radiation sources, alternative approaches are needed in order to depict the microgap formation...
February 2018: Heliyon
Ilona Lálová, Lucie Filipovská, Hana Skalická, Ondřej Šmíd, Aleš Linhart, Helena Kollárová, Jan Bělohlávek
Introduction: Extracorporeal cardiopulmonary resuscitation (ECPR) is a challenging approach for treating refractory out-of-hospital cardiac arrest (OHCA). Case Presentation: The authors describe a case of a 40-year-old Caucasian female who suffered from refractory OHCA, was admitted to a hospital while receiving ongoing cardiopulmonary resuscitation, and was connected to venoarterial extracorporeal membrane oxygenation 73 minutes after collapse. Ventricular tachyarrhythmias alternating with pulseless electrical activity resolved after eight hours...
2018: Case Reports in Medicine
Pavel Hála, Mikuláš Mlček, Petr Ošťádal, David Janák, Michaela Popková, Tomáš Bouček, Stanislav Lacko, Jaroslav Kudlička, Petr Neužil, Otomar Kittnar
A stable and reliable model of chronic heart failure is required for many experiments to understand hemodynamics or to test effects of new treatment methods. Here, we present such a model by tachycardia-induced cardiomyopathy, which can be produced by rapid cardiac pacing in swine. A single pacing lead is introduced transvenously into fully anaesthetized healthy swine, to the apex of the right ventricle, and fixated. Its other end is then tunneled dorsally to the paravertebral region. There, it is connected to an in-house modified heart pacemaker unit that is then implanted in a subcutaneous pocket...
February 17, 2018: Journal of Visualized Experiments: JoVE
Sven Persoon, Michael Paulus, Stephan Hirt, Carsten Jungbauer, Alexander Dietl, Andreas Luchner, Christof Schmid, Lars S Maier, Christoph Birner
Implantation of left ventricular assist devices (LVADs) as bridge to transplant in end-stage heart failure allows for analyzing reverse remodeling processes of the supported heart. Whether this therapy influences the cGMP-PKG signaling pathway, which is currently under thorough investigation for developing new heart failure therapeutics, is unknown. In fourteen end-stage heart failure patients (8 with dilated cardiomyopathy, DCM; 6 with ischemic cardiomyopathy, ICM) tissue specimens of left ventricles were collected at LVAD implantation and afterwards at receiver heart explantation, respectively...
March 15, 2018: Heart and Vessels
Jonas Lorenz, Mike Barbeck, Charles James Kirkpatrick, Robert Sader, Henriette Lerner, Shahram Ghanaati
PURPOSE: In this prospective study, the regenerative potential and pathways of a new injectable bone substitute (IBS) material composed of beta-tricalcium phosphate (β-TCP) and hyaluronan were investigated for its application in alveolar bone regeneration within extraction sockets. MATERIALS AND METHODS: The bone substitute material was implanted in 44 extraction sockets after removal of teeth not worth preserving in the maxillary and mandibular arches of 21 patients...
March 15, 2018: International Journal of Oral & Maxillofacial Implants
Adham M Alifarag, Christopher D Lopez, Rodrigo Neiva, Nick Tovar, Lukasz Witek, Paulo G Coelho
Osseointegration, the direct functional and structural connection between device and bone is influenced by multiple factors such as implant macrogeometry and surgical technique. This study investigated the effects of osseodensification drilling techniques on implant stability and osseointegration using trabecular metal (TM) and tapered-screw vent (TSV) implants in a low-density bone. Six skeletally mature sheep were used where six osteotomy sites were prepared in each of the ilia, (n = 2/technique: regular [R] (subtractive), clockwise [CW], and counterclockwise [CCW])...
March 14, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Renzo Guarnieri, Maurizio Grande, Francesco Zuffetti, Tiziano Testori
PURPOSE: To retrospectively evaluate the incidence of peri-implant mucositis and peri-implantitis around dental implants with the same body design and surface but different collar surface (laser-microgrooved vs not laser-microgrooved) after 5 years of loading in private practice patients. MATERIALS AND METHODS: The study was carried out on patients at a private dental clinic enrolled in a periodontal maintenance program, who received at least one implant with a laser-microgrooved collar surface and one implant without a laser-microgrooved collar surface...
March 2018: International Journal of Oral & Maxillofacial Implants
Francesco Amato, Giorgio Polara, Giorgio Alfredo Spedicato
PURPOSE: The aim of this study was to evaluate the buccopalatal volumetric tissue change that occurs following flapless single-tooth immediate extraction placement in the esthetic area and to analyze the role of four different variables. MATERIALS AND METHODS: Patients in need of a single-tooth replacement in the anterior maxillary or mandibular area (premolar to premolar) were recruited for the study. Patients were treated using four different therapeutic modalities: group 1 (healing abutment), group 2 (healing abutment + bone graft), group 3 (provisional restoration), and group 4 (provisional + bone graft)...
March 2018: International Journal of Oral & Maxillofacial Implants
Kenji Fugito Junior, Arthur Rodriguez Gonzalez Cortes, Ricardo de Carvalho Destro, Marcelo Yoshimoto
PURPOSE: The search for optimizing rehabilitation results with the use of osseointegrated implants has led oral surgeons to look for other technologies that can provide better predictability for treatments; however, effectiveness must be considered as well. This study aimed to compare temperature variation during preparation of implant surgical beds using conventional rotary implant burs versus ultrasonic tips and to study perforation effectiveness by analyzing the functional wear of both systems and the influence of such wear on the overheating of cortical bone...
March 2018: International Journal of Oral & Maxillofacial Implants
Holger Zipprich, Florian Rathe, Sören Pinz, Luca Schlotmann, Hans-Christoph Lauer, Christoph Ratka
PURPOSE: The aim of this study was to investigate the effects of tightening torque, screw head angle, and thread number on the preload force of abutment screws. MATERIALS AND METHODS: The test specimens consisted of three self-manufactured components (ie, a thread sleeve serving as an implant analog, an abutment analog, and an abutment screw). The abutment screws were fabricated with metric M1.6 external threads. The thread number varied between one and seven threads...
March 2018: International Journal of Oral & Maxillofacial Implants
Valessa F Carvalho, Priscilla Bf Soares, Crisnicaw Verissimo, Roberto S Pessoa, Antheunis Versluis, Carlos J Soares
PURPOSE: The purpose of this study was to evaluate mouthguard shock absorption ability, strain, and stress generation during impact on dental implants placed in the anterior maxilla. The mouthguard material was also characterized. MATERIALS AND METHODS: Sixty experimental models were created and divided into six groups (n = 10): implant type, external hexagon (EH) and Morse taper (MT); without and with two mouthguards (MTG), EVA custom-fitted (Ct-MTG) and standard self-adapted (St-MTG)...
March 2018: International Journal of Oral & Maxillofacial Implants
Sung-Yong Cho, Yun-Hyuk Huh, Chan-Jin Park, Lee-Ra Cho
PURPOSE: To investigate the stress distribution in an implant-abutment complex with a preloaded abutment screw by comparing implant-abutment engagement features using three-dimensional finite element analysis (FEA). MATERIALS AND METHODS: For FEA modeling, two implants-one with a single (S) engagement system and the other with a double (D) engagement system-were placed in the human mandibular molar region. Two types of abutments (hexagonal, conical) were connected to the implants...
March 2018: International Journal of Oral & Maxillofacial Implants
Irena Sailer, Asgeir G Asgeirsson, Daniel S Thoma, Vincent Fehmer, Thor Aspelund, Mutlu Özcan, Bjarni E Pjetursson
BACKGROUND: There is limited knowledge regarding the strength of zirconia abutments with internal and external implant abutment connections and zirconia abutments supported by a titanium resin base (Variobase, Straumann) for narrow diameter implants. OBJECTIVES: To compare the fracture strength of narrow diameter abutments with different types of implant abutment connections after chewing simulation. MATERIAL AND METHODS: Hundred and twenty identical customized abutments with different materials and implant abutment connections were fabricated for five groups: 1-piece zirconia abutment with internal connection (T1, Cares-abutment-Straumann BL-NC implant, Straumann Switzerland), 1-piece zirconia abutment with external hex connection (T2, Procera abutment-Branemark NP implant, Nobel Biocare, Sweden), 2-piece zirconia abutments with metallic insert for internal connection (T3, Procera abutment-Replace NP implant, Nobel Biocare), 2-piece zirconia abutment on titanium resin base (T4, LavaPlus abutment-VarioBase-Straumann BL-NC implant, 3M ESPE, Germany) and 1-piece titanium abutment with internal connection (C, Cares-abutment-Straumann BL-NC implant, Straumann, Switzerland)...
March 11, 2018: Clinical Oral Implants Research
Jonas Lorenz, Alica Kubesch, Sarah Al-Maawi, Frank Schwarz, Robert A Sader, Markus Schlee, Shahram Ghanaati
OBJECTIVES: The aim of the present study was the histological investigation of an allogeneic spongious bone block for horizontal and vertical ridge augmentation in humans. The amount of new bone, soft tissue, and residual bone substitute were histomorphometrically assessed after a mean healing period of 6 months. MATERIALS AND METHODS: Fourteen patients received augmentation with an allogeneic spongious bone block (Tutobone® , Tutogen Medical, Neunkirchen, Germany)...
March 9, 2018: Clinical Oral Investigations
Gustavo Assis de Paula, Guilherme Carvalho Silva, Ênio Lacerda Vilaça, Tulimar Machado Cornacchia, Cláudia Silami de Magalhães, Allyson Nogueira Moreira
PURPOSE: Biomechanical behavior of tooth-implant-supported prostheses (TISPs) with external and internal implants was compared. MATERIALS AND METHODS: Two 3-D models of TISP were designed by varying the implant: external (Model EH) and internal hexagons (Model IH). After loading, von Mises stresses were obtained in implants, abutments, and screws. Principal maximum (σmax) and minimum (σmin) stresses were analyzed in periodontal ligament (PL), alveolar bone, and periimplant bone...
March 7, 2018: Implant Dentistry
Gabriele Dell'Era, Matteo Ziacchi, Eleonora Prenna, Igor Diemberger, Marco Varalda, Cristian Martignani, Federico Guerra, Mauro Biffi, Eraldo Occhetta
BACKGROUND: The management of patients explanted for implantable defibrillator (ICD) infections may be complex when anti-bradycardia pacing and tachyarrhythmia protection are needed. We aimed to test the efficacy and safety of a conventional ICD externally connected to a transvenous dual-coil lead as bridging therapy before the re-implantation. METHODS AND RESULTS: We enrolled seven patients explanted for ICD infections and needing prolonged antibiotic therapy in two high-volume hospitals in Italy and treated them with a passive can external ICD for a mean of 13 (4-30) days before re-implant...
March 8, 2018: Pacing and Clinical Electrophysiology: PACE
Yoshiaki Takewa, Hirohito Sumikura, Satoru Kishimoto, Noritsugu Naito, Kei Iizuka, Daichi Akiyama, Ryosuke Iwai, Eisuke Tatsumi, Yasuhide Nakayama
Tissue-engineered heart valves (TEHVs) are expected to be viable grafts. However, it is unknown whether they transit their histological structure after implantation. We developed a novel autologous TEHV (named stent biovalve) for transcatheter implantation, using in-body tissue engineering based on a tissue encapsulation phenomenon. In this study, a time-course histological transition of implanted biovalves was investigated in goats. Three types of stent biovalves were prepared by 2 month embedding of plastic molds mounted with metallic stents, in the subcutaneous spaces...
March 5, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Cimara Fortes Ferreira, Edival Barreto de Magalhães Junior, Barbara Zini
Achieving excellence in anterior rehabilitations requires close cooperation between the periodontist and the prosthodontist. Many techniques can be used to restore the lost alveolar hard and soft tissues. The more severe the peri-implant defect, the higher the challenge and lower the predictability of the procedure. The present case consists of Seibert class III with mal-aligned implants in the esthetic zone resolved with a cost-modified treatment plan to re-establish esthetics in the anterior maxilla using rotated palatal flap...
March 8, 2018: Journal of Oral Implantology
Xue-Yi Sun, Zhi Yu, Zhi-Yu Chen, Bin Xu
OBJECTIVE: To observe the effect of manual acupuncture stimulation of different layers (skin, muscle, peritoneum, sub-peritoneum) of "Tianshu" (ST 25) region on proximal colonic pressure in normal rats. METHODS: Forty-eight male SD rats were divided into 6 groups: all layer-needling, brushing, cutaneous needling, muscular needling, peritoneum-needling and sub-peritoneum-needling groups ( n =8 in each group). Manual needling or brushing was applied to "Tianshu" (ST 25) region...
February 25, 2018: Zhen Ci Yan Jiu, Acupuncture Research
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