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https://www.readbyqxmd.com/read/28771376/slant-perception-under-stereomicroscopy
#1
Samantha Horvath, Kori Macdonald, John Galeotti, Roberta L Klatzky
Objective These studies used threshold and slant-matching tasks to assess and quantitatively measure human perception of 3-D planar images viewed through a stereomicroscope. The results are intended for use in developing augmented-reality surgical aids. Background Substantial research demonstrates that slant perception is performed with high accuracy from monocular and binocular cues, but less research concerns the effects of magnification. Viewing through a microscope affects the utility of monocular and stereo slant cues, but its impact is as yet unknown...
August 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28765670/microleakage-in-class-v-composite-restorations-after-desensitizing-surface-treatment-with-er-yag-and-co2-lasers
#2
Hamid Reza Mozaffari, Alireza Ehteshami, Farshad Zallaghi, Nasim Chiniforush, Zohreh Moradi
Aims: Glutaraldehyde, CO2 and Er:YAG lasers can be used for treatment of dentin hypersensitivity. However, their application may have adverse effects on the clinical service of restorations. This study aimed to assess the microleakage in composite restorations following surface treatment with Glutaraldehyde desensitizer, CO2 and Er:YAG laser irradiation for treatment of dentin hypersensitivity. Materials and methods: This experimental study was conducted on 60 extracted sound human teeth. Class V cavities were prepared measuring 3×3 mm using a diamond bur...
December 30, 2016: Laser Therapy
https://www.readbyqxmd.com/read/28764296/stereomicroscopic-dye-leakage-measurement-of-six-different-root-canal-sealers
#3
Srinidhi V Ballullaya, Vusurumarthi Vinay, Jayaprakash Thumu, Srihari Devalla, Indira Priyadarshini Bollu, Sagarika Balla
INTRODUCTION: Hermetic sealing of the root canal is the most desirable outcome of any root canal treatment, but almost always the filling of the root canal is defective, which is a multifactorial outcome. One such factor majorly influencing the obturation is the root canal sealer used. AIM: The present study was done for evaluating microleakage in different root canal sealers. MATERIALS AND METHODS: Sixty extracted human single rooted teeeth were used in this in-vitro study...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28764285/a-comparative-evaluation-of-the-influence-of-command-set-methods-on-microleakage-of-glass-ionomer-cement-an-in-vitro-study
#4
Sairaj Punnathara, Ramalingam Krishnakumar, Mohan Govindarajan, Momeka Kanaran, Sunil Thomas Philip, Aswin Saseendran Nair, Joby Peter
INTRODUCTION: A major challenge when using glass ionomer cement in clinical situation particularly in paediatric dentistry is to overcome the problem of microleakage. Fast or command setting of Type IX glass ionomer cement using external energy source enhances the setting reaction and results in improved initial physical and mechanical properties. AIM: To compare and evaluate the influence of ultrasonic activation, halogen light irradiation and combined effect of both on microleakage of enamel adjacent to Type IX glass ionomer restorations...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28762352/a-comparative-study-to-associate-the-presence-of-neonatal-line-in-deciduous-teeth-of-infants-with-the-occurrence-of-live-birth
#5
Shruti Srinivasan, Prashanth Sadashiva Murthy, Seema Deshmukh, N M Shamsundar
CONTEXT: The prominent striae of retzius corresponding to the occurrence of live birth is known as the neonatal line (NNL). The very presence of this line indicates the exposure of the infant to the stressful event of birth. AIMS: The study was aimed at locating the NNL in the developing primary teeth of the neonate and associating the presence of NNL to the occurrence of live birth. MATERIALS AND METHODS: The donated bodies of the neonates were taken, and a surgical incision was made along the crest of the alveolar ridge in the maxillary anterior region, enabling the careful removal of the tooth germs from within the jaw segment...
July 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28762350/comparative-evaluation-of-microleakage-between-bulk-esthetic-materials-versus-resin-modified-glass-ionomer-to-restore-class-ii-cavities-in-primary-molars
#6
Vellore Kannan Gopinath
AIM: The aim of the study was to assess the microleakage of one high-viscosity conventional glass ionomer cement (GIC) and a bulk-fill composite resin, in comparison to a resin-modified GIC in Class II restorations in primary molars. MATERIALS AND METHOD: Standardized Class II slot cavity preparations were prepared in exfoliating primary molars. Teeth were restored using one of the three materials tested (n = 10): SonicFill bulk-fill composite resin (SF), EQUIA Fil conventional reinforced GIC (EQF), and Vitremer resin-reinforced GIC (VT)...
July 2017: Journal of the Indian Society of Pedodontics and Preventive Dentistry
https://www.readbyqxmd.com/read/28761246/efficacy-of-two-rotary-retreatment-systems-in-removing-gutta-percha-and-sealer-during-endodontic-retreatment-with-or-without-solvent-a-comparative-in-vitro-study
#7
Moushmi Chalakkarayil Bhagavaldas, Abhinav Diwan, S Kusumvalli, Shiraz Pasha, Madhuri Devale, Deepak Chowdary Chava
OBJECTIVES: The aim of this in vitro study was to compare the efficacy of two retreatment rotary systems in the removal of Gutta-percha (GP) and sealer from the root canal walls with or without solvent. MATERIALS AND METHODS: Forty-eight extracted human mandibular first premolars were prepared and obturated with GP and AH Plus sealer. Samples were then randomly divided into four groups. Group I was retreated with MtwoR rotary system without solvent, Group II was retreated with MtwoR rotary system with Endosolv R as the solvent, Group III with D-RaCe rotary system without solvent, and Group IV with D-RaCe rotary system and Endosolv R solvent...
January 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/28756962/evaluation-of-different-techniques-for-filling-simulated-c-shaped-canals-of-3-dimensional-printed-resin-teeth
#8
Tuba Gok, Ismail Davut Capar, Ilgin Akcay, Ali Keles
INTRODUCTION: The purpose of this study was to compare the ability of different root canal filling methods on the C1 root canal anatomy using 3-dimensional (3D) printer technology. METHODS: Mandibular molars were scanned with cone-beam computed tomographic (CBCT) imaging. A mandibular molar tooth with a C1 root canal configuration was selected according to images obtained from CBCT technology. The root canals were shaped with ProTaper Universal rotary instruments (Dentsply Maillefer, Ballaigues, Switzerland) and hand files...
July 27, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28756596/new-photic-stimulating-system-with-white-light-emitting-diodes-to-elicit-electroretinograms-from-zebrafish-larvae
#9
Hisashi Matsubara, Yoshitsugu Matsui, Ryohei Miyata, Yuhei Nishimura, Tetsuro Yamamoto, Toshio Tanaka, Mineo Kondo
PURPOSE: The zebrafish is an established animal model commonly used in biological, neuroscience, and genetic research. We have developed a new light stimulating system using white light-emitting diodes (LEDs) to elicit ERGs from zebrafish larvae. The purpose of this study was to record full-field ERGs and to evaluate the inter-trial reliability of the ERGs recorded with our system from zebrafish larvae. METHODS: The stimulating device used white LEDs that were attached to a stereomicroscope, and the location of the recording electrode on the cornea could be monitored while the eye was being stimulated...
July 29, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28748051/factors-affecting-marginal-integrity-of-class-ii-bulk-fill-composite-resin-restorations
#10
Siavash Savadi Oskoee, Mahmoud Bahari, Elmira Jafari Navimipour, Amir Ahmad Ajami, Negar Ghiasvand, Ayda Savadi Oskoee
Background. Bulk-fill composite resins are a new type of resin-based composite resins, claimed to have the capacity to be placed in thick layers, up to 4 mm. This study was carried out to evaluate factors affecting gap formation in Cl II cavities restored using the bulk-fill technique. Methods. A total of 60 third molars were used in this study. Two Cl II cavities were prepared in each tooth, one on the mesial aspect 1 mm coronal to the CEJ and one on the distal aspect 1 mm apical to the CEJ. The teeth were divided into 4 groups: A: The cavities were restored using the bulk-fill technique with Filtek P90 composite resin and its adhesive system and light-cured with quartz tungsten halogen (QTH) light-curing unit...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28748049/effect-of-different-nickel-titanium-rotary-files-on-dentinal-crack-formation-during-retreatment-procedure
#11
Mehmet Çitak, Taha Özyürek
Background. The aim of this study was to compare the dentinal defects caused by Reciproc, TF Adaptive and ProTaper Next NiTi rotary file systems during the retreatment procedure. Methods. A total of 150 mandibular incisors with straight and single root canals were included in the present study. All the root canals were prepared up to an apical diameter 0.40 mm using stainless steel files. Thirty teeth were randomly stored as the negative control group. A total of 120 specimens were obturated with gutta-percha and AH Plus sealer using vertical compaction technique...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28729785/evaluation-of-dentinal-defects-during-root-canal-preparation-using-thermomechanically-processed-nickel-titanium-files
#12
Bertan Kesim, Burak Sagsen, Tugrul Aslan
OBJECTIVE: The aim of this study was to compare the incidence of root cracks after root canal instrumentation with thermomechanically processed nickel-titanium (Ni-Ti) files with different instrumentation kinematics. MATERIALS AND METHODS: A total of 150 extracted mandibular premolars with mature apices and straight root canals were divided into five groups and used in this study. In Group 1, 30 teeth were prepared using hand K-files and assigned to control group, Group 2 was instrumented using K3XF Rotary files (SybronEndo, Glendora, CA, USA) with continuous rotary motion...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28721994/evaluation-of-marginal-and-internal-gaps-of-metal-ceramic-crowns-obtained-from-conventional-impressions-and-casting-techniques-with-those-obtained-from-digital-techniques
#13
Rathika Rai, S Arun Kumar, R Prabhu, Ranjani Thillai Govindan, Faiz Mohamed Tanveer
BACKGROUND: Accuracy in fit of cast metal restoration has always remained as one of the primary factors in determining the success of the restoration. A well-fitting restoration needs to be accurate both along its margin and with regard to its internal surface. AIM: The aim of the study is to evaluate the marginal fit of metal ceramic crowns obtained by conventional inlay casting wax pattern using conventional impression with the metal ceramic crowns obtained by computer-aided design and computer-aided manufacturing (CAD/CAM) technique using direct and indirect optical scanning...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28702839/macroscopic-and-stereomicroscopic-comparison-of-hacking-trauma-of-bones-before-and-after-carbonization
#14
Véronique Alunni, Luísa Nogueira, Gérald Quatrehomme
This experimental study examined lesions produced by a hatchet on pig femurs before and after carbonization. A total of 30 lesions were produced and analyzed using stereomicroscopy and then reexamined after carbonization. Not only was the sharp-blunt mechanism of the hacking trauma (V-shape, regularity of one edge, irregularity of the other edge, upraising, lateral pushing back, fossae dug laterally to the edge) still recognizable after carbonization; in some instances, the carbonization actually enhanced the features observed...
July 12, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28678948/effectiveness-of-various-irrigation-protocols-for-the-removal-of-calcium-hydroxide-from-artificial-standardized-grooves
#15
Hakan Gokturk, Ismail Ozkocak, Feyzi Buyukgebiz, Osman Demir
Objective: The aim of this study was to investigate the ability of laser-activated irrigation (LAI), XP-endo Finisher, CanalBrush, Vibringe, passive ultrasonic irrigation (PUI), and conventional syringe irrigation systems on the removal of calcium hydroxide (CH) from simulated root canal irregularities. Material and Methods: The root canals of one hundred and five extracted single-rooted teeth were instrumented using Reciproc rotary files up to size R40. The teeth were split longitudinally...
May 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28658907/effect-of-5-chlorine-dioxide-irrigant-on-micro-push-out-bond-strength-of-resin-sealer-to-radicular-dentin-an-in-vitro-study
#16
Rejitha R Kamalasanan, Swapna V Devarasanahalli, Ranjini M Aswathanarayana, K Rashmi, Yashwanth Gowda, Roopa R Nadig
INTRODUCTION: Chlorine dioxide (ClO2) has been recently investigated as a possible root canal irrigant due to its broad spectrum of antimicrobial action, tissue dissolution and smear layer removal properties. Literature is scarce on the effect of chlorine dioxide irrigation on the resin sealer dentin bond strength. AIM: To compare 5% chlorine dioxide (ClO2) with or without Ethylene Diamine Tetra Acetic acid (EDTA) with 3% Sodium hypochlorite (NaOCl) and EDTA combination as endodontic irrigants on the adhesion of AH Plus sealer to radicular dentin using micro- Push out Bond Strength (µPBS) test...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658906/the-effect-of-cavity-design-on-fracture-resistance-and-failure-pattern-in-monolithic-zirconia-partial-coverage-restorations-an-in-vitro-study
#17
Madhavareddy Sri Harsha, Mynampati Praffulla, Mandava Ramesh Babu, Gudugunta Leneena, Tejavath Sai Krishna, G Divya
INTRODUCTION: Cavity preparations of posterior teeth have been frequently associated with decreased fracture strength of the teeth. Choosing the correct indirect restoration and the cavity design when restoring the posterior teeth i.e., premolars was difficult as it involves aesthetic, biomechanical and anatomical considerations. AIM: To evaluate the fracture resistance and failure pattern of three different cavity designs restored with monolithic zirconia. MATERIALS AND METHODS: Human maxillary premolars atraumatically extracted for orthodontic reasons were chosen...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28654862/biopolymer-zein-coated-gold-nanoparticles-synthesis-antibacterial-potential-toxicity-and-histopathological-effects-against-the-zika-virus-vector-aedes-aegypti
#18
Periyakaruppan Suganya, Baskaralingam Vaseeharan, Sekar Vijayakumar, Banumathi Balan, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
The control of multidrug-resistant bacteria as well as insect pests and vectors is timely and important now a days. The present study was designed to evaluate the in vitro antibacterial, antibiofilm and mosquito larvicidal effects of gold nanoparticles synthesized using the zein biopolymer (Ze-AuNPs) against Gram positive (Bacillus pumilus and Bacillus subtilis), Gram negative (Shigella sonnei and Pseudomonas aeruginosa) bacteria and third instar larvae of the dengue and Zika virus vector Aedes aegypti. The synthesized Ze-AuNPs were characterized by UV-vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM)...
June 17, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28653133/dysregulation-of-cerebellar-adrenomedullin-signaling-during-hypertension
#19
Leticia Figueira, Anita Israel
Adrenomedullin (AM) is a peptide involved in blood pressure regulation. AM activates three different receptors, the AM type 1 (AM1), type 2 (AM2), and calcitonin gene-related peptide 1 (CGRP1) receptors. AM triggers several signaling pathways such as adenylyl cyclase (AC), guanylyl cyclase (GC), and extracellular signal-regulated kinases (ERK) and modulates reactive oxygen species (ROS) metabolism. Cerebellar AM, AM-binding sites, and its receptor components are altered during hypertension, although it is unknown if these alterations are associated with changes in AM signaling...
August 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28642910/influence-of-abutment-design-on-retention-of-metal-copings-cemented-to-implants
#20
Albano Porto da Cunha, Glauco Pereira Moysés, Ana Christina Claro Neves, Rafael Pino Vitti, Flávia Cardoso da Rosa Goulart, Laís Regiane da Siva-Concílio
Objective The study evaluated the influence of abutment design on the retention of implant-cemented metal copings. Material and methods Two abutments of the same system with the same indications, height and the total occlusal convergence, but of different designs were evaluated. Ten RN synOcta abutments (Straumann, Waltham, MA) and ten RN titanium solid abutments (Straumann, Waltham, MA) were tightened to 35 Ncm on 20 implant analogs previously placed in resin blocks. Twenty plastic burnout copings were waxed, included, cast and machined by a single operator...
December 2016: Acta Biomaterialia Odontologica Scandinavica
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