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External connection implant

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...
October 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
Rodrigo Antonio de Medeiros, Eduardo Piza Pellizzer, Aljomar José Vechiato Filho, Daniela Micheline Dos Santos, Emily Vivianne Freitas da Silva, Marcelo Coelho Goiato
STATEMENT OF PROBLEM: Different factors can influence marginal bone loss around dental implants, including the type of internal and external connection between the implant and the abutment. The evidence needed to evaluate these factors is unclear. PURPOSE: The purpose of this systematic review was to evaluate marginal bone loss by radiographic analysis around dental implants with internal or external connections. MATERIAL AND METHODS: A systematic review was conducted following the criteria defined by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA)...
July 13, 2016: Journal of Prosthetic Dentistry
Mark G Luciano, Stephen M Dombrowski, Sara Qvarlander, Serge El-Khoury, Jun Yang, Suraj Thyagaraj, Francis Loth
OBJECT Intracranial pressure (ICP) pulsations are generally considered a passive result of the pulsatility of blood flow. Active experimental modification of ICP pulsations would allow investigation of potential active effects on blood and CSF flow and potentially create a new platform for the treatment of acute and chronic low blood flow states as well as a method of CSF substance clearance and delivery. This study presents a novel method and device for altering the ICP waveform via cardiac-gated volume changes...
July 15, 2016: Journal of Neurosurgery
Martin Jakobs, Andreas Unterberg, Rolf-Detlef Treede, Sigrid Schuh-Hofer, Rezvan Ahmadi
BACKGROUND: Neurosurgical pain management of drug-resistant trigeminal neuralgia (TN) is highly challenging. Microvascular decompression is a first-line neurosurgical approach for classical TN with neurovascular conflict, but can show clinical relapse despite proper decompression. Second-line destructive techniques like radiofrequency thermocoagulation have become reluctantly used due to their potential for irreversible side effects. Subcutaneous peripheral nerve field stimulation (sPNFS) is a minimally invasive neuromodulatory technique which has been shown to be effective for chronic localised pain conditions...
September 2016: Acta Neurochirurgica
Roberto S Pessoa, Ravel M Sousa, Leandro M Pereira, Flavio D Neves, Fabio J B Bezerra, Siegfried V N Jaecques, Jos V Sloten, Marc Quirynen, Wim Teughels, Rubens Spin-Neto
OBJECTIVES: To evaluate clinical, radiographic, microbiologic, and biomechanical parameters related to bone remodeling around implants with external hexagon (EH) and Morse-taper (MT) connections. MATERIALS AND METHODS: Twelve totally edentulous patients received four custom-made implants in the interforaminal region of the mandible. Two of those implants had the same macroscopic design, but different prosthetic connections. All patients received an immediate implant-supported prosthesis...
June 29, 2016: Clinical Implant Dentistry and related Research
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
Deniz Tuna Edizer, Turgut Adatepe, Nurten Uzun, Ozgur Yigit, Aysegul Gunduz, Muhammet Yildiz, Ozlem Onerci Celebi
OBJECTIVE: To evaluate the functional integrity of the facial nerve and blink reflex (BR) pathways in asymptomatic patients who underwent cochlear implantation (CI). STUDY DESIGN: Case series with planned data collection. SETTING: Tertiary referral center. SUBJECTS AND METHODS: Twenty-four deafened patients with unilateral CI who had no complications were enrolled. Bilateral compound muscle action potentials (CMAPs) of the facial nerve were recorded over the nasalis and occipitalis muscles, whereas BR responses were recorded over the orbicularis oculi after supraorbital nerve stimulation...
June 14, 2016: Otolaryngology—Head and Neck Surgery
Elzbieta M van der Steen-Banasik, Geert A H J Smits, Bernard J Oosterveld, Theo Janssen, Andries G Visser
PURPOSE: To report experience and early results of laparoscopic implantation for interstitial brachytherapy (BT) of solitary bladder tumors and the feasibility of a high-dose-rate (HDR) schedule. METHODS AND MATERIALS: From December 2009 to April 2015, 57 patients with a T2 solitary bladder tumor were treated in Arnhem with transurethral bladder resection followed by external beam irradiation, applied to the bladder and regional iliac lymph nodes, 40 Gy in 20 fractions, 5 fractions per week, and within 1 week interstitial HDR BT, in selected cases combined with partial cystectomy and lymph node dissection...
August 1, 2016: International Journal of Radiation Oncology, Biology, Physics
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