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https://www.readbyqxmd.com/read/29693083/effectiveness-of-titanium-tetrafluoride-on-the-bond-strength-of-resin-cement-to-titanium
#1
Shaymaa E Elsaka
PURPOSE: To assess the influence of titanium tetrafluoride (TiF4) solution on the adhesion of composite cement to commercially pure titanium (cp Ti). MATERIALS AND METHODS: cp Ti plates with dimensions of 30 mm × 8 mm × 1.5 mm were machined and polished. The specimens were divided into seven groups according to the surface treatment as follows: group 1: control (machined); group 2: sandblasted with 110 μm Al2O3; group 3: hydrofluoric acid (HF); group 4: TiF4 (5%-5 min); group 5: TiF4 (5%-10 min); group 6: TiF4 (10%-5 min); and group 7: TiF4 (10%-10 min)...
April 24, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29692935/percutaneous-injection-of-strontium-containing-hydroxyapatite-versus-polymethacrylate-plus-short-segment-pedicle-screw-fixation-for-traumatic-a2-and-a3-ao-type-fractures-in-adults
#2
Panagiotis Korovessis, Eva Mpountogianni, Vasileios Syrimpeis, Andreas Baikousis, Vasileios Tsekouras
Introduction: Polymethacrylate (PMMA) is commonly used in vertebroplasty and balloon kyphoplasty, but its use has been associated with complications. This study tests three hypotheses: (1) whether strontium hydroxyapatite (Sr-HA) is equivalent to PMMA for restoring thoracolumbar vertebral body fractures, (2) whether the incidence of PMMA leakage is similar to that of Sr-HA leakage, and (3) whether Sr-HAis is resorbed and substituted by new vertebral bone. Materials and Methods: Two age- and sex-matched groups received short percutaneous pedicle screw fixation plus PEEK implant (Kiva, VCF Treatment System, Benvenue Medical, Santa Clara, CA, USA) filled with either Sr-HA (Group A) or PMMA (Group B) after A2- and A3/AO-type thoracolumbar vertebral body fractures...
2018: Advances in Orthopedics
https://www.readbyqxmd.com/read/29692851/revascularization-and-apical-plug-in-an-immature-molar
#3
Leyla Roghanizadeh, Mahta Fazlyab
Managing of necrotic permanent teeth with immature apices is a treatment challenges. Treatment of such teeth includes apexification, apical plug and more recently, revascularization technique with the probable advantage of continuation of root development. In the present case report the referred patient had discomfort with a necrotic immature mandibular first molar. Periapical radiography showed a rather large apical lesion around immature roots. Revascularization protocol using calcium-enriched mixture (CEM) cement was indicated for the mesial root...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692850/rapid-bone-healing-after-intentional-replantation-of-a-molar-with-apical-actinomycosis
#4
Saeed Asgary, Leyla Roghanizadeh
Actinomycosis is a rare lesion of the jaws and may present as periapical pathosis; therefore, it is essential to be correctly diagnosed and managed. This case presentation describes management of a tooth with a symptomatic apical periodontitis caused by Actinomyces species supplemented with medicine prescription. A woman was referred for endodontic management of tooth #19. The tooth had a history of previous nonsurgical endodontic retreatment. Clinically, the tooth was very sensitive to percussion. Radiographic evaluation showed a large periapical lesion...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692843/effect-of-mta-and-cem-on-mineralization-associated-gene-expression-in-stem-cells-derived-from-apical-papilla
#5
Niusha Hajizadeh, Zahra Sadat Madani, Ebrahim Zabihi, Moniyreh Golpour, Amir Zahedpasha, Mousa Mohammadnia
Introduction: This study assessed the effect of mineral trioxide aggregate (MTA) and calcium-enriched mixture (CEM) cement on odontogenic differentiation and mineralization of stem cells. Methods and Materials: After confirmation of stemness and homogeneity of stem cells derived from apical papilla (SCAPs) using flow cytometry, the cells were exposed for 3 weeks to either osteogenic medium (OS) or CEM extract+OS (CEM+OS) or MTA extract in OS (MTA+OS) or DMEM based regular culture media (negative control)...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692836/effect-of-root-canal-sealers-on-bond-strength-of-fiber-posts-to-root-dentin-cemented-after-one-week-or-six-months
#6
Lucas Ruiz, Giovana Mongruel Gomes, Bruna Bittencourt, Fabrício Rutz da Silva, Osnara Maria Mongruel Gomes, Julio Cezar Chidoski Filho, Abraham Lincoln Calixto
Eugenol-based root canal sealers (RCS) have been widely used by clinicians; however, their effect on resinous materials is still questionable. The objective of this study was to evaluate the influence of RCS at 1 week and 6 months' post obturation on the bond strength (BS) of glass fiber posts (GFP) to root dentin, using conventional and self-adhesive cementation systems (CS). The roots of 56 extracted human canines, were divided in eight groups ( n =7) according to the combination of the following factors: RCS (with or without eugenol-Endofill and Sealer 26, respectively), storage period post obturation and prior GFP cementation (1 week and 6 months) and cementation systems (Variolink II - conventional resin cement or RelyX U200-self-adhesive resin cement)...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692835/the-efficacy-of-metal-artifact-reduction-mode-in-cone-beam-computed-tomography-images-on-diagnostic-accuracy-of-root-fractures-in-teeth-with-intracanal-posts
#7
Zahra Dalili Kajan, Mehran Taramsari, Negar Khosravi Fard, Farnoosh Khaksari, Forough Moghasem Hamidi
Introduction: The purpose of this study was to evaluate the efficacy of cone-beam computed tomography CBCT in the diagnosis of RF in the presence of an intracanal posts with and without applying "metal artifact reduction" (MAR) mode. Methods and Materials: This in vitro study included 60 single-canal endodontically treated premolars. Post spaces were created in all roots. RFs were simulated in 30 of the 60 teeth. Dentatus posts were cemented in 15 of 30 roots with and without RFs...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692828/evaluation-of-four-pulpotomy-techniques-in-primary-molars-a-randomized-controlled-trial
#8
Ghassem Ansari, Seyyedeh Pouya Morovati, Saeed Asgary
Introduction: This trial was designed to evaluate the clinical and radiographic success rates of calcium-enriched mixture (CEM) cement with and without low level laser therapy (LLLT) and compare them to that of formocresol (FC) and ferric sulfate (FS) in primary molar pulpotomies. Methods and Materials: This randomized clinical trial was conducted on a total of 160 teeth selected from 40 patients aged 3-9 years. Patients with at least four primary molars needing pulpotomy, were included in order to have each tooth assigned randomly in one of the four following groups; FC, FS, CEM, and LLLT/CEM...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29692569/effect-of-surface-treatments-on-the-retention-of-implant-supported-cement-retained-bridge-with-short-abutments-an-in-vitro-comparative-evaluation
#9
Monica Shrivastav
Statement of Problem: In clinical situations, short implant abutments create lack of retention with overlying cemented prosthesis. Aims: The aim of this study is to evaluate the impact of different surface treatments on the retention of implant-supported cement-retained bridge with short implant abutments. Materials and Methods: Six straight Adin implant abutments of similar sizes (3 mm diameter × 3 mm height) were selected. All were divided into three groups ( n = 2): with circumferential grooves and sandblasting (G + SB), with a circumferential groove and bur modification (G + B) and third one taken as control...
April 2018: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29692220/very-high-volume-fly-ash-green-concrete-for-applications-in-india
#10
Jing Yu, Dhanada K Mishra, Chang Wu, Christopher Ky Leung
Safe disposal of fly ash generated by coal-based thermal power plants continues to pose significant challenges around the world and in India in particular. Green structural concrete with 80% cement replaced by local Chinese fly ash has been recently developed to achieve a target characteristic compressive strength of 45 MPa. Such green concrete mixes are not only cheaper in cost, but also embody lower energy and carbon footprint, compared with conventional mixes. This study aims to adopt such materials using no less than 80% fly ash as binder in routine concrete works in countries like India with the commonly used lower target characteristic compressive strength of 30 MPa...
April 1, 2018: Waste Management & Research
https://www.readbyqxmd.com/read/29691662/microleakage-of-composite-crowns-luted-on-cad-cam-milled-human-molars-a-new-method-for-standardized-in-vitro-tests
#11
Maximiliane Amelie Schlenz, Alexander Schmidt, Peter Rehmann, Thomas Niem, Bernd Wöstmann
OBJECTIVES: To investigate debonding of full crowns made of CAD/CAM composites, CAD/CAM technology was applied to manufacture standardized test abutments to increase the reproducibility of human teeth used in in vitro studies. MATERIALS AND METHODS: A virtual test abutment and the corresponding virtual crown were designed and two STL data sets were generated. Sixty-four human third molars and CAD/CAM blocks were milled using a CNC machine. Crowns of four different composite blocks (Lava Ultimate (LU), Brilliant Crios (BC), Cerasmart (CS), Experimental (EX)) were adhesively bonded with their corresponding luting system (LU: Scotchbond Universal/RelyX Ultimate; BC: One Coat 7 Universal/DuoCem; CS: G-PremioBond/G-Cem LinkForce; EX: Experimental-Bond/Experimental-Luting-Cement)...
April 24, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29691552/-cytotoxicity-of-3-resin-cements-to-human-gingival-fibroblasts
#12
Chang-Yuan Zhang, Gang Niu, Yi-Yi Jin, Hao Yu, Hui Cheng
PURPOSE: To study the cytotoxicity of 3 resin cements to human gingival fibroblasts (HGFs). METHODS: Three resin cements (Panavia F, RelyXTM Unicem and Multilink Speed) test samples were immersed and incubated in the culture medium for 48 h at 37degrees centigrade. Cultured HGFs were exposed to two concentrations (50% and 100%) of material elutes for 24 h, 72 h and 120 h. The proliferation rate was evaluated using CCK-8 assay. The data were statistically analyzed by one-way analysis of variance using SPSS 20...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29691551/-experimental-research-of-hot-alkaline-solution-etching-treatment-on-zirconia-resin-bonding-strength
#13
Li-Yang Wan, Hong-Shui Zhu
PURPOSE: In this experiment, we applied hot alkaline solution (20%NaOH solutions) to treat the surfaces of zirconia ceramics in vitro, then evaluated the changes of bond strength of zirconia ceramics and resin cement. METHODS: Eighteen pieces of zirconia ceramic specimens were made, using the same method of grinding and polishing, and then randomly divided them into 3 groups: group A with hot alkali solution treatment (20%NaOH) (n=6), group B underwent sand blasting with a diameter of 110 ?m alumina particles (n=6), group C was as the control group...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29691456/subsurface-endospore-forming-bacteria-possess-bio-sealant-properties
#14
Sreenivasulu Basha, Lakshman Kumar Lingamgunta, Jayakumar Kannali, Swarna Kumari Gajula, Ramesh Bandikari, Sreenivasulu Dasari, Veena Dalavai, Paramageetham Chinthala, Prasada Babu Gundala, Peera Kutagolla, Vinodh Kumar Balaji
Concrete is a strong and fairly inexpensive building substance, but has several disadvantages like cracking that allows corrosion, thus reducing its lifespan. To mitigate these complications, long-lasting microbial self-healing cement is an alternative that is eco-friendly and also actively repairs cracks. The present paper describes the detailed experimental investigation on compressive strength of cement mortars, mixed with six alkaliphilic bacteria, isolated from subsurface mica mines of high alkalinity...
April 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29691168/predicting-failure-in-early-acute-prosthetic-joint-infection-treated-with-debridement-antibiotics-and-implant-retention-external-validation-of-the-klic-score
#15
Claudia A M Löwik, Paul C Jutte, Eduard Tornero, Joris J W Ploegmakers, Bas A S Knobben, Astrid J de Vries, Wierd P Zijlstra, Baukje Dijkstra, Alex Soriano, Marjan Wouthuyzen-Bakker
BACKGROUND: Debridement, antibiotics, and implant retention (DAIR) is a widely used treatment modality for early acute prosthetic joint infection (PJI). A preoperative risk score was previously designed for predicting DAIR failure, consisting of chronic renal failure (K), liver cirrhosis (L), index surgery (I), cemented prosthesis (C), and C-reactive protein >115 mg/L (KLIC). The aim of this study was to validate the KLIC score in an external cohort. METHODS: We retrospectively evaluated patients with early acute PJI treated with DAIR between 2006 and 2016 in 3 Dutch hospitals...
March 27, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29690550/study-on-cr-vi-leaching-from-cement-and-cement-composites
#16
Adriana Estokova, Lenka Palascakova, Maria Kanuchova
This paper reports an experimental study on hexavalent chromium leaching from cement samples and cement composites containing silica fume and zeolite additions that were subjected to various leaching agents. The water-soluble Cr(VI) concentrations in cements ranged from 0.2 to 3.2 mg/kg and represented only 1.8% of the total chromium content. The presence of chromium compounds with both chromium oxidation states of III and VI was detected in the cement samples by X-ray photoelectron spectroscopy (XPS). Leaching tests were performed in a Britton-Robinson buffer to simulate natural conditions and showed increased dissolution of Cr(VI) up to 6 mg/kg...
April 22, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29687410/laser-led-phototherapy-on-the-repair-of-tibial-fracture-treated-with-wire-osteosynthesis-evaluated-by-raman-spectroscopy
#17
Antônio L B Pinheiro, Luiz G P Soares, Aline C P da Silva, Nicole R S Santos, Anna Paula L T da Silva, Bruno Luiz R C Neves, Amanda P Soares, Landulfo Silveira
The aim of the present study was to assess, by means of Raman spectroscopy, the repair of complete surgical tibial fractures fixed with wire osteosynthesis (WO) treated or not with infrared laser (λ780 nm) or infrared light emitting diode (LED) (λ850 ± 10 nm) lights, 142.8 J/cm2 per treatment, associated or not to the use of mineral trioxide aggregate (MTA) cement. Surgical tibial fractures were created on 18 rabbits, and all fractures were fixed with WO and some groups were grafted with MTA. Irradiated groups received lights at every other day during 15 days, and all animals were sacrificed after 30 days, being the tibia removed...
April 23, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29683811/is-cement-augmentation-a-viable-treatment-option-for-an-osteoporotic-compression-fracture
#18
Saad B Chaudhary, Jason W Savage
No abstract text is available yet for this article.
April 20, 2018: Clinical Spine Surgery
https://www.readbyqxmd.com/read/29683803/is-cemented-or-cementless-femoral-stem-fixation-more-durable-in-patients-older-than-75-years-of-age-a-comparison-of-the-best-performing-stems
#19
Michael Tanzer, Stephen E Graves, Andrea Peng, Andrew J Shimmin
BACKGROUND: There is ongoing debate concerning the best method of femoral fixation in older patients receiving primary THA. Clinical studies have shown high survivorship for cemented and cementless femoral stems. Arthroplasty registry studies, however, have universally shown that cementless stems are associated with a higher rate of revision in this patient population. It is unclear if the difference in revision rate is a reflection of the range of implants being used for these procedures rather than the mode of fixation...
April 9, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29682992/higher-periprosthetic-fracture-rate-associated-with-use-of-modern-uncemented-stems-compared-to-cemented-stems-in-femoral-neck-fractures
#20
Jin Soo A Song, Daryl Dillman, Dave Wilson, Michael Dunbar, Glen Richardson
INTRODUCTION: Hemiarthroplasty is the preferred treatment for displaced femoral neck fractures in elderly patients. Recently, short tapered-wedge cementless stems have increasingly been used in this population. However, historic data has consistently shown higher rates of periprosthetic fracture with uncemented stems in hip fracture patients. This study aims to evaluate the rate of periprosthetic fracture requiring re-operation and all-cause mortality between cemented and uncemented femoral stem designs including more recent short tapered-wedge cementless stems in hip fracture patients...
April 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
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