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N G Fischer, A Tsujimoto, A G Baruth
OBJECTIVE: Limited information is available on how to polish and finish zirconia surfaces following computer-aided design/computer-aided manufacturing (CAD/CAM), specifically, how differing application forces and reuse of zirconia polishing systems affect zirconia topography. PURPOSE: To determine the effect of differing, clinically relevant, polishing application forces and multiple usages of polishing burs on the surface topography of CAD/CAM zirconia. METHODS: One hundred twenty 220-grit carbide finished zirconia disks were sintered according to manufacturer's directions and divided into two groups for the study of two coarse polishing bur types...
March 16, 2018: Operative Dentistry
Toru Takagi, Akira Aoki, Shizuko Ichinose, Yoichi Taniguchi, Noriko Tachikawa, Takeshi Shinoki, Walter Meinzer, Anton Sculean, Yuichi Izumi
BACKGROUND: Recently, the occurrence of peri-implantitis has been increasing. However, a suitable method to debride the contaminated surface of titanium implants has not been established. The aim of this study was to investigate the morphological changes of the microstructured fixture surface after erbium laser irradiation, and to clarify the effects of the erbium lasers when used to remove calcified deposits from implant fixture surfaces. METHODS: In experiment 1, sandblasted, large grit, acid etched surface implants were treated with Er:YAG laser or Er,Cr:YSGG laser at 30-60 mJ/pulse and 20 Hz with water spray...
March 13, 2018: Journal of Periodontology
A I Mirulla, L Bragonzoni, S Zaffagnini, M Bontempi, V Nigrelli, T Ingrassia
INTRODUCTION: Traditional prosthetic solutions expose the amputee to numerous problems that limit his ability to safely perform the normal activities of daily life. In order to eliminate the problems related to the use of the traditional prosthesis with socket, a new technique was developed for fixing the prosthesis to the amputees based on the principle of osseointegration. The aim of this paper is to study and analyze the stress distribution on the interface between a trans-humeral osseointegrated prosthetic implant and the residual bone, identifying the most stressed areas and thus foreseeing possible failure phenomena of the entire prosthetic system and, after, to compare the stress distribution on three different prosthetic designs that differ from each other for some geometric characteristics...
March 7, 2018: Injury
Makiko Takashima, Yoshiaki Arai, Atsushi Kawamura, Katsumi Uoshima
PURPOSE: This study analyzed risk factors for post-loading implant loss in cases of implant-supported prostheses applied to edentulous jaws of Japanese patients. METHODS: In total, 245 dental implant fixtures placed in 54 edentulous jaws of 46 patients performed at Niigata University Hospital were retrospectively analyzed. Kaplan-Meier curves were used to estimate the cumulative survival rate (SR) of implants, and multiple Cox regression analysis was used to identify predictive factors of implant loss...
March 8, 2018: Journal of Prosthodontic Research
Moustafa Abdou ELsyad, Waleed Hamed Maryod, Aisha Zakaria Mostafa
PURPOSE: To evaluate the influence of implant position on clinical and radiographic outcomes of Locator-retained mandibular overdentures MATERIALS AND METHODS: Fifteen edentulous participants with compromised bone at canine regions of the mandible were given 2 implants in the premolar areas (study group, PM). The control group (CA) consisted of 15 participants who received 2 implants in the canine regions, matched to PM and assigned as historical control. For study and control groups, mandibular dentures were constructed and attached to the fixtures with Locator attachments using the delayed loading protocol...
March 6, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Gorkem Kiyak, Tevfik Balikci, Ahmed Majid Heydar, Murat Bezer
Study Design: Mechanical study. Purpose: To compare the pullout strength of different screw designs and augmentation techniques in an osteoporotic bone model. Overview of Literature: Adequate bone screw pullout strength is a common problem among osteoporotic patients. Various screw designs and augmentation techniques have been developed to improve the biomechanical characteristics of the bone-screw interface. Methods: Polyurethane blocks were used to mimic human osteoporotic cancellous bone, and six different screw designs were tested...
February 2018: Asian Spine Journal
Grace Chiu, Chris Chang, W Eugene Roberts
A 36-year-old woman with good periodontal health sought treatment for a compensated Class II partially edentulous malocclusion associated with a steep mandibular plane (SN-MP, 45°), 9 missing teeth, a 3-mm midline discrepancy, and compromised posterior occlusal function. She had multiple carious lesions, a failing fixed prostheses in the mandibular right quadrant replacing the right first molar, and a severely atrophic edentulous ridge in the area around the mandibular left first and second molars. After restoration of the caries, the mandibular left third molar served as anchorage to correct the mandibular arch crowding...
March 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Amelia A Lake
The burden of obesity contributes to increasing health inequality, and placing healthcare systems under huge strain. The modern society could broadly be described to support unhealthful eating patterns and sedentary behaviour; also described as obesogenic. Obesity prevention and treatment has focused on educational and behavioural interventions, with limited overall success. A sustainable approach is to address the environments that promote less healthy eating and high energy intake as well as sedentary behaviour...
March 1, 2018: Proceedings of the Nutrition Society
David Pierre, Viswanathan Swaminathan, Laura Y Scholl, Kevor TenHuisen, Jeremy L Gilbert
BACKGROUND: Mechanically assisted crevice corrosion of modular tapers continues to be a concern in total joint arthroplasties. A surgical factor that may affect taper fretting corrosion during cyclic loading is seating load magnitude. In this study, modular head-neck taper junctions were seated, capturing load-displacement, over a range of axially oriented loads, and electrochemical and micromotion data were captured during short-term incremental cyclic fretting corrosion (ICFC) tests...
February 2, 2018: Journal of Arthroplasty
Tiziano Testori, Tommaso Weinstein, Fabio Scutellà, Hom-Lay Wang, Giovanni Zucchelli
Patient expectations from implant treatment have changed over the years and esthetics plays an important role in defining what is now called success of rehabilitation. Of the many factors that influence the outcome of the rehabilitation, the two main ones are the bone and soft-tissue deficiencies at the intended implant site. Many surgical approaches are described in terms of timing of implant placement and management of regenerative procedures. The aim of this article is to discuss the different implant placement alternatives in the esthetic area, in particular: (i) the timing of implant placement/regenerative procedures/skeletal growth/altered passive eruption; (ii) the correct three-dimensional position of the fixture between the cuspids and in the premolar area; (iii) multiple missing teeth in the esthetic area with single tooth/pontic or cantilevered options/prosthetic compensation; (iv) placement of implants into infected sites; and (v) the influence of abutment and crown morphology on implant position...
February 27, 2018: Periodontology 2000
B E Louie, W Hofstetter, G Triadafilopoulos, B L Weusten
Current ablation devices for dysplastic Barrett's esophagus are effective but have significant limitations. This pilot study aims to evaluate the safety, feasibility, and dose response of a novel cryoballoon swipe ablation system (CbSAS) in three experimental in vitro and in vivo models. CbSAS is a through-the-scope compliant balloon that is simultaneously inflated and cooled by liquid nitrous oxide delivered from a disposable handheld unit. When the cryogen is applied through a special diffuser it covers a 90° section of the circumference of the esophagus for 3 cm length...
February 21, 2018: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
Liming Shu, Naohiko Sugita, Masaya Oshima, Mamoru Mitsuishi
Orthopedic oscillating saws (OOSs) are widely used for plane processing in orthopedic surgery such as knee and hip replacement. However, sawing has been associated with bone breakthrough and necrosis problems. In this paper, a novel elliptical vibration assisted OOS was designed to achieve a low cutting force under the condition of deepening cut depth and reducing cutting speed, based on the analysis of brittle fractures of the bone and elliptical vibration assisted cutting kinematics. The elliptical vibration was generated using two parallel stacked piezoelectric actuators assembled with the fixture...
February 20, 2018: Medical Engineering & Physics
Colin W Fuller
The loss of players through injury is known to affect team performance in many sports; it is important therefore for professional teams to be able to quantify the likely injury-burden that will be encountered throughout a season. A kinetic model, based on the rates at which match and training injuries are sustained and resolved, a team's squad size and the 2017/18 season fixture schedule for teams competing in the English Premier League, is used to produce daily forecasts of injury-burden experienced by a typical team...
February 23, 2018: Scandinavian Journal of Medicine & Science in Sports
Mihir Raghavendra Kulkarni, Purva Vijay Bakshi, Abhishek Somanath Kavlekar, Srinath Lakshman Thakur
Abrams's palatal roll technique has been used extensively to augment peri-implant soft tissues in the maxillary esthetic zone and has seen numerous modifications. An adaptation of the palatal roll technique is described here and its simplicity of application in three different scenarios is demonstrated. At second-stage implant surgery, a partial thickness initial incision followed by a palatal subepithelial dissection at the site of implant was done and a connective tissue graft with a buccal pedicle was obtained...
July 2017: Journal of Indian Society of Periodontology
Jung-In Kang, Mee-Kyoung Son, Han-Cheol Choe
The purpose of this study was to investigate hydroxyapatite coatings containing Mn and Si on the oxidized Ti-6Al-4V alloy for dental applications. Dental implant fixture and Ti-6Al-4V ELI disk were used as substrates for plasma electrolytic oxidation (PEO) treatment. PEO treatment was performed at 280 V for 3 min in various solutions. The surface morphologies of the specimens after PEO treatment were observed with a field-emission scanning electron microscope, energy-dispersive X-ray spectroscopy, X-ray diffractometer, and Fourier transform infrared spectroscopy...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Amin Rahpeyma, Saeedeh Khajehahmadi
Background: There are two limiting factors for determining the dental implant fixture length in mandibular posterior edentulous region: Inferior dental canal and submandibular fossa. Purpose: Submandibular fossa augmentation is a suggested way to overcome the problem of lingual undercut beneath the mylohyoid ridge in implant dentistry. Materials and Methods: Patients with lingual posterior bony undercut that interferes with the placement of a standard implant with a length of 10 mm were enrolled in this study...
May 2017: Journal of Indian Society of Periodontology
S Muñoz, J L Sebastián, P Antoranz, J P García-Cambero, A Sanchis-Otero
PURPOSE: This paper studies the variation of the electromagnetic parameters of a suspension of zebrafish (Danio rerio) embryos to assess its potential applications to toxicological and biomedical research areas. MATERIALS AND METHODS: For this purpose, the dielectric impedance spectroscopy technique is applied to a modified coaxial line enclosing the biological suspension to be characterized in the frequency range from 100 kHz to 100 MHz. The electrical parameters of the suspension under test were obtained by fitting the impedance spectra to the resulted from the simulation of the test fixture using finite elements (FE)...
February 12, 2018: International Journal of Radiation Biology
Suhyun Park, Hyun-Joong Yoon
PURPOSE: The aim of the present prospective and preliminary study was to compare the clinical and radiographic outcomes of 2 types of rough surfaced implants after implant placement in the atrophic posterior maxilla with sinus membrane elevation without bone grafting using the crestal approach. PATIENTS AND METHODS: All clinical and radiographic records for 28 patients who had received 40 implants were included in the present study. The patients returned for radiographic and clinical examinations at 1, 3, and 6 months and every 6 months thereafter after implantation...
January 31, 2018: Journal of Oral and Maxillofacial Surgery
Bridgette Farnworth, John Innes, Catherine Kelly, Ray Littler, Joseph R Waas
Avoiding foraging under increased predation risk is a common anti-predator behaviour. Using artificial light to amplify predation risk at ecologically valuable sites has been proposed to deter introduced mice (Mus musculus) and ship rats (Rattus rattus) from degrading biodiversity in island ecosystems. However, light may adversely affect native species; in particular, little is known about invertebrate responses to altered lighting regimes. We investigated how endemic orthopterans responded to artificial light at Maungatautari Ecological Island (Waikato, New Zealand)...
January 26, 2018: Environmental Pollution
Amy J Mathers, Kasi Vegesana, Ian German Mesner, Katie E Barry, Aaron Pannone, Josh Baumann, Derrick W Crook, Nicole Stoesser, Shireen Kotay, Joanne Carroll, Costi D Sifri
Background: Increasing prevalence of nosocomial carbapenemase-producing Enterobacteriaceae is a concern; however, the role of the environment in multispecies outbreaks remains poorly understood. There is increasing recognition that hospital wastewater plumbing may play a role. Methods: Covers were installed on all hoppers in adult intensive care units (ICUs) of a university hospital; in the surgical ICU (SICU) both hopper covers and sink trap heating/vibration devices were installed...
February 2, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
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