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Amount of irregularities cement

Harish Mullaguri, Nandini Suresh, Smitha Surendran, Natanasabapathy Velmurugan, Selvarajan Chitra
INTRODUCTION: The purpose of this study was to evaluate the influence of pH that is due to setting reaction of Biodentine, glass ionomer cement (GIC), and intermediate restorative material (IRM) on transforming growth factor-β1 (TGF-β1) release and on the fibrin architecture of platelet-rich fibrin (PRF). METHODS: PRF was obtained from 8 volunteers and layered over the freshly prepared GIC, IRM, and Biodentine mixtures. TGF-β1 release was estimated by using enzyme-linked immunosorbent assay (ELISA), and fibrin structure of PRF was analyzed by using scanning electron microscope at 1 and 5 hours...
May 2016: Journal of Endodontics
Shahbaz Khan, Muhammad Kaleem, Muhammad Amber Fareed, Amir Habib, Kefi Iqbal, Ayesha Aslam, Shahab Ud Din
The purpose of this study was to investigate the chemical composition and particle morphology of white mineral trioxide aggregate (WMTA) and two white Portland cements (CEM 1 and CEM 2). Compositional analysis was performed by energy dispersive X-ray spectroscopy, X-ray fluorescence spectrometry and X-ray diffraction whereas, morphological characteristics were analyzed by scanning electron microscope and Laser scattering particle size distribution analyzer. The elemental composition of WMTA, CEM 1 and CEM 2 were similar except for the presence of higher amounts of bismuth in WMTA...
2016: Dental Materials Journal
C I A van Houdt, R S Preethanath, B A J A van Oirschot, P H W Zwarts, D J O Ulrich, S Anil, J A Jansen, J J J P van den Beucken
This work aimed to compare in vitro degradation of dense PLGA microspheres and milled PLGA particles as porogens within CPC, considering that the manufacturing of milled PLGA is more cost-effective when compared with PLGA microspheres. Additionally, we aimed to examine the effect of porogen amount within CPC/PLGA on degradation and bone formation. Our in vitro results showed no differences between both forms of PLGA particles (as porogens in CPC; spherical for microspheres, irregular for milled) regarding morphology, porosity, and degradation...
February 2016: Journal of Biomedical Materials Research. Part A
Thaiane Rodrigues Aguiar, Marina Di Francescantonio, Ana Karina Bedran-Russo, Marcelo Giannini
The purpose of this study was to characterize the inorganic components and morphology of filler particles of conventional and self-adhesive, dual-curing, resin luting cements. The main components were identified by energy dispersive X-ray spectroscopy microanalysis (EDX), and filler particles were morphologically analyzed by scanning electron microscopy (SEM). Four resin cements were used in this study: two conventional resin cements (RelyX ARC/3M ESPE and Clearfil Esthetic Cement/Kuraray Medical) and two self-adhesive resin cements (RelyX Unicem/3M ESPE and Clearfil SA Luting/Kuraray Medical)...
October 2012: Microscopy Research and Technique
Robert J Mann, Andrew L Blount, Keith C Neaman, Lindsey Korepta
Reconstruction of the craniofacial skeleton has undergone a significant evolution during the past century. Initially, the use of autogenous bone grafts from various sites was the criterion standard. However, owing to donor site morbidity and lack of sufficient bone for large defects, surgeons have relied on various bone substitutes. Hydroxyapatite (HA) has served as an alternative to autogenous grafts, but questions regarding biocompatibility, risk of infection, and slow set times have hampered its acceptance...
November 2011: Journal of Craniofacial Surgery
R Michael Gross, Robin High, Kimberly Apker, John Haggstrom, Jennifer Allen Fehringer, Jill Stephan
INTRODUCTION: This was a prospective random study to determine if suction applied to the glenoid vault through the coracoid process would facilitate deeper penetration of cement into the vault, and if deeper penetration would lead to a more durable glenoid component. MATERIALS AND METHODS: A group of 96 patients were randomly assigned to 1 of 2 pathways for glenoid fixation. One was cemented using modern "third generation" cementing techniques, while the second group utilizes these same steps as well as a vacuum assist (weep-hole) technique...
October 2011: Journal of Shoulder and Elbow Surgery
Tai-Ping Wang, Kui-bo Zhang, Zhao-min Zheng, Hui Liu, Bin-sheng Yu
OBJECTIVE: To investigate vertebral augmentation with a novel reticulate bone filling container system by polymethyl methacrylate (PMMA) injection in cadaveric simulated vertebral compressive fracture and explore the effect of reticulate bone filling container on cement distribution controlling within vertebral body and the restoration of biomechanical properties after augmentation. METHODS: A total of 28 freshly frozen human vertebrae specimens were randomly divided into 4 groups...
April 19, 2011: Zhonghua Yi Xue za Zhi [Chinese medical journal]
G Krastl, J Gugger, H Deyhle, N U Zitzmann, R Weiger, B Müller
AIM: To investigate the correlation between geometric parameters of severely compromised root filled (RCT) pre-molar teeth with irregular root canals and their fracture resistance. The null hypothesis tested was that the fracture resistance of root filled teeth is not influenced by: (i) the adhesive surface of the post-space preparation (A(PS) ), (ii) the coronal tooth surface (A(A) ), (iii) the amount of resin cement (V(C) ) and (iv) the Young's modulus of the specimens. METHODOLOGY: A total of 48 noncarious human pre-molar teeth with irregular root canals were decoronated, root filled and adhesively restored with post-retained direct composite crowns...
May 2011: International Endodontic Journal
Ran Lador, Niv Dreiangel, Peleg J Ben-Galim, John A Hipp
BACKGROUND CONTEXT: Minimally invasive procedures for the treatment of vertebral compression fractures (VCFs) have been in use since the mid-1980s. A mixture of liquid monomer and powder is introduced through a needle into one or both pedicles, and it polymerizes within the vertebral body in an exothermic chemical reaction. The interaction between cement and the fractured vertebral body determines whether and how the cement stabilizes the fragments, alters morphology, and extravasates...
December 2010: Spine Journal: Official Journal of the North American Spine Society
Maria Giovanna Gandolfi, Kirsten Van Landuyt, Paola Taddei, Enrico Modena, Bart Van Meerbeek, Carlo Prati
INTRODUCTION: ProRoot mineral trioxide aggregate (MTA) and calcium silicate cements are able to set in a moist environment. The aim of the study was to examine the surface structure and composition of a cement paste under wet conditions and in real time during setting by environmental scanning electron microscopy connected with energy dispersive x-ray analysis (ESEM-EDX) and micro-Raman techniques. METHODS: White ProRoot MTA and experimental white tetrasilicate cement (wTC) and wTC containing bismuth oxide (wTC-Bi) were studied...
May 2010: Journal of Endodontics
Seyed Mehdi Hashemi, Bijan Hashemi-Malayeri, Gholamreza Raisali, Parvaneh Shokrani, Ali Akbar Sharafi, Mansour Jafarizadeh
High-energy linear accelerators (linacs) have several advantages, including low skin doses and high dose rates at deep-seated tumours. But, at energies more than 8 MeV, photonuclear reactions produce neutron contamination around the therapeutic beam, which may induce secondary malignancies. In spite of improvements achieved in medical linac designs, many countries still use conventional (non-intensity-modulated radiotherapy) linacs. Hence, in these conventional machines, fitting the beam over the treatment volume may require using blocks...
2008: Radiation Protection Dosimetry
Mark L Wang, Jennifer Massie, Andrew Perry, Steven R Garfin, Choll W Kim
BACKGROUND CONTEXT: As the aging population increases, the rising prevalence of osteoporosis-related spine fractures will have a dramatic impact on health care. At present, mainstay treatment relies on systemic medications intended to prevent diminishing bone mineral density (BMD) and bone mass. However, an adjunctive treatment strategy is to target specific areas of the skeletal system that are prone to clinically significant osteoporotic fractures. We term this strategy the "local treatment of osteoporosis" or osteoplasty...
July 2007: Spine Journal: Official Journal of the North American Spine Society
Masaya Suzuki, Aiko Katsumi, Ruuna Watanabe, Manabu Shirono, Yoshiroh Katoh
This study examined the wound healing process of rat pulp directly capped with various experimentally developed adhesive resin systems and treated with CO2 laser irradiation. The experimental adhesive resins used in this study were made from Clearfil Mega Bond (MB). The adhesive resin groups were capped with a combination of the following primers and bonding agents: commercially available MB primer (MBP), experimental MB primer containing 2wt% N-methacryloyl 5-aminosalicylic acid (5-NMSA: MP3) and 5wt% 12-methacryloyloxydodecylpyridinium bromide (MDPB: ABP); and commercially available MB bonding agent (MBB), experimental MB bonding agent containing 5wt% and 10wt% hydroxyl-calcium phosphate (hydroxyapatite: MB1, MB2) and 5wt% dicalcium phosphate dihydrate (brushite: MB3) as a reparative dentin-promoter...
November 2005: Operative Dentistry
William P Magee, Nicolás Ajkay, Nicola Freda, Richard S Rosenblum
Patients who have previously had surgical correction of major craniofacial deformities will often have residual contour deformities they wish to have improved at a later date. The development of hydroxyapatite cement has simplified these procedures. The setting time is reduced to 5 to 8 minutes by mixing the cement with a phosphate-based solution, increasing the tensile strength, and maintaining the same biocompatibility and osseoconductivity. This study includes 48 patients who presented with a variety of residual contour irregularities secondary to a craniofacial congenital anomaly or a posttraumatic defect...
August 2004: Plastic and Reconstructive Surgery
M R Virto, P Frutos, Susana Torrado, G Frutos
Modified polymethylmethacrylate (PMMA) bone cements formulations were prepared by including different proportions of gentamicin and release modulators such as lactose or hydroxypropylmethylcellulose (HPMC). Surface aspect, gentamicin release and porosity of these modified formulations were studied by means of scanning electron microscopy (SEM), a specially designed system for the dissolution studies of the bone cements, and mercury intrusion porosimetry. Lactose modified cements presented an irregular surface with numerous hollows and voids due to the lactose dissolution...
January 2003: Biomaterials
S Torrado, P Frutos, G Frutos
Due to the extended use of acrylic bone cements, its necessary to develop improved formulations in order to resolve their many drawbacks. The present work was conducted to make a physical-chemical characterisation of this kind of acrylic cement in order to introduce future changes in the formulations to: (1) improve or at least maintain their mechanical properties; (2) diminish their toxicity, and (3) control the drug release (rate and amount). From the dissolution method we can conclude that the preparation method (with or without pressure) of specimens is not responsible for the erratic release...
April 17, 2001: International Journal of Pharmaceutics
A Kuhn, G Scheller, M Schwarz
The initial stability of 6 different hemispherical press-fit titanium acetabular cups was investigated by lever-out tests using a foam model. Each cup was implanted in a standardised manner into machined PVC-foam blocks with an underreaming of 1/2/3 mm, and levered out 5 times. A computer recorded the load-displacement curves. Both insertion forces and lever-out forces increased with increasing press-fit from 1 to 2 mm. With underreaming of 2 mm, insertion forces varied between 9 and 34 Nm, and lever-out torques between 13 and 23 Nm...
December 1999: Biomedizinische Technik. Biomedical Engineering
A R Flores, G Sáez E, F Barceló
Enamel acid etching plays an important role in treatment on direct bracket bonding. Several studies have been carried out concerning the damage this procedure causes to the enamel. A valuable alternative seems to be the use of photopolymerizable resin-reinforced glass ionomer without acid etching of enamel. This study compares the strength of bracket debonding, the amount of remnant adhesive on the tooth, and the enamel condition in 3 adhesive systems. Three groups were set; in the first group, a glass ionomer with a photopolymerizable resin reinforce and enamel etching with orthophosphoric acid at 37% was used; in the second group, the same ionomer was used but without acid etching; and in the third group, a photopolymerizable resin was used after etching enamel with orthophosphoric acid at 37%...
November 1999: American Journal of Orthodontics and Dentofacial Orthopedics
J L Weissman, C H Snyderman, B E Hirsch
PURPOSE: To describe the radiologic appearance of hydroxyapatite cement (HAC), which, when mixed with liquid, forms a paste that can be contoured to osseous defects and, over time, becomes "osseointegrated" (native bone grows into the pores of the HAC and forms a strong chemical bond with the substance). METHODS: Between March 1992 and June 1993, 24 adults (16 men, eight women) underwent skull base surgery that included reconstruction or closure with HAC. Fourteen patients had HAC placed in the paranasal sinuses or facial bones, and 10 had HAC placed in the mastoid cavity...
September 1996: AJNR. American Journal of Neuroradiology
H G Willert, G H Buchhorn, D Göbel, G Köster, S Schaffner, R Schenk, M Semlitsch
The authors reviewed their collection of retrieved all metal hip joints (9 McKee-Farrar, 7 Müller, and 3 Huggler type prostheses) and tissues from the joint capsules and implant beds. The amount of wear was measured, and the total volume was calculated. The tissues were analyzed by atomic absorption spectral analysis or inductively coupled plasma mass spectrometry and examined by light and scanning electron microscopy. The size of particles was measured with a texture analysis system. The articulating surfaces showed many delicate scratches which represent normal wear...
August 1996: Clinical Orthopaedics and related Research
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