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https://www.readbyqxmd.com/read/29327089/comparative-efficacy-of-er-cr-ysgg-and-er-yag-lasers-for-etching-of-composite-for-orthodontic-bracket-bonding
#1
Amir Hossein Mirhashemi, Nasim Chiniforush, Nastaran Sharifi, Amir Mehdi Hosseini
Several techniques have been proposed to obtain a durable bond, and the efficacy of these techniques is assessed by measuring parameters such as bond strength. Laser has provided a bond strength as high as that of acid etching in vitro and has simpler use with shorter clinical time compared to acid etching. This study aimed to compare the efficacy of Er:YAG and Er,Cr:YSGG lasers for etching and bonding of composite to orthodontic brackets. No previous study has evaluated the effect of these particular types of laser...
January 11, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29296111/effect-of-surface-treatment-on-enamel-cracks-after-orthodontic-bracket-debonding-er-cr-ysgg-laser-etching-versus-acid-etching
#2
Hassanali Ghaffari, Amirhossein Mirhashemi, Tahereh Baherimoghadam, Amir Azmi, Reza Rasooli
Objectives: This study sought to compare enamel cracks after orthodontic bracket debonding in the surfaces prepared with erbium, chromium: yttrium-scandium-galliumgarnet (Er,Cr:YSGG) laser and the conventional acid-etching technique. Materials and Methods: This in-vitro experimental study was conducted on 60 sound human premolars extracted for orthodontic purposes. The teeth were randomly divided into two groups (n=30). The teeth in group A were etched with 37% phosphoric acid gel, while the teeth in group B were subjected to Er,Cr:YSGG laser irradiation (gold handpiece, MZ8 tip, 50Hz, 4...
September 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29284963/evaluation-of-push-out-bond-strength-of-fiber-post-after-treating-the-intra-radicular-post-space-with-different-post-space-treatment-techniques-a-randomized-controlled-in-vitro-trial
#3
Sebeena Mathew, Iswarya R Raju, C P Sreedev, K Karthick, T Boopathi, N T Deepa
Objective: The aim of this study was to evaluate the push out bond strength after treating the post space with different irrigation procedures. Study Design: The study sample comprised of 60 recently extracted premolars. These teeth were placed in 5.25% sodium hypochlorite solution for 5 min and then washed under tap water. De-coronated samples were biomechanically prepared until F3 ProTaper and obturated using AH-Plus and 30# (6%) gutta-percha. The specimens were allowed to set for 24 h and then post space was prepared...
November 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/29281052/mite-fauna-assessment-in-houses-of-two-distinct-socioeconomic-groups-from-southern-brazil
#4
Moisés S Dutra, Cristian Roncada, Guilherme L da Silva, Noeli J Ferla, Paulo M Pitrez
House dust mites (HDM) are the main source of aeroallergens worldwide, yet epidemiological differences between socioeconomic factors in association with this medical condition have not been studied in the south region of Brazil. To assess the prevalence of HDM in two socioeconomically distinct populations of patients with allergic asthma or rhinitis, the differences between samples from houses of high-income families and low-income families were analyzed. Mite samples were collected between July and December 2015, in Porto Alegre, Brazil...
December 21, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29259362/a-comparative-evaluation-of-accuracy-of-three-electronic-apex-locators-using-histological-section-as-gold-standard-an-ex-vivo-study
#5
Divya Saxena, Suparna Ganguly Saha, Anuj Bharadwaj, Neelam Vijaywargiya, Sandeep Dubey, Shubham Kala
Introduction: The aim of the present study was to comparatively evaluate the accuracy of iRoot, iPex II, and Propex pixi apex locator using histological sections as the gold standard. Materials and Methods: Thirty patients indicated for extraction of single-rooted permanent teeth with single canal system were selected. Working lengths (WLs) of teeth were determined using iRoot, iPex II, and Propex pixi. Teeth were then extracted, and the files were reintroduced to the anatomic apex to measure anatomic canal length (ACL) and fixed at the ACL using flowable composite...
July 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29248941/evaluation-of-an-experimental-remineralizing-agent-for-repairing-enamel-surfaces
#6
Margarita V Úsuga Vacca, Carolina Torres-Rodríguez, Edgar Delgado-Mejía
The best material for repairing enamel surface defects is one very similar to the original enamel and which interacts with natural remineralization mechanisms. It does not repair extensive damage, so in order to fill large defects, external help is required using phosphocalcic ceramic composites that activate salivary remineralization efficiently though on smaller in scale. Effective adhesion of the repair may depend on the amount of aqueous fluids present in the enamel, which apparently enable nucleation and growth of new minerals to ensure adhesion and stability...
August 2017: Acta Odontológica Latinoamericana: AOL
https://www.readbyqxmd.com/read/29235087/quantitative-prenatal-growth-of-the-cervical-sympathetic-trunk-components-in-sheep-ovis-arise-during-the-fetal-period
#7
Saleh Bamohabat, Jamal Nourinezhad, Yazdan Mazaheri
BACKGROUND: Six liner measurements of constant cranial cervical ganglion (CCG), three inconstant main, first, second middle cervical ganglia (MG, MG1, MG2), and interganglionic branch (IGB) were taken to determine normal fetal growth rates and patterns of cervical sympathetic trunk (CST) components in different gestational ages. MATERIALS AND METHODS: 40 sheep fetuses of both sexes aged from 60 to 140 days were divided into 4 groups and eighty sides of fetuses were examined under a stereomicroscope using a digital caliper...
December 13, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/29225641/foramen-changes-following-over-instrumentation-of-curved-canals-with-three-engine-driven-instruments-an-in-vitro-study
#8
Salwa Yammine, Edgard Jabbour, Paul Nahas, Zeina Majzoub
Introduction: The present in vitro study aimed to evaluate and compare the changes in shape and surface area of the major foramen following shaping of curved canals with three new generation NiTi engine-driven instruments naming ProTaper Next, BT RaCe and WaveOne Gold- with 3 different levels of protrusion beyond the major apical foramen. Methods and Materials: A total of 45 extracted human molars with at least one curved canal were distributed in 3 comparable groups of 15 that were instrumented using either ProTaper Next (PTN), BT RaCe (BTR) or WaveOne Gold (WOG)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225637/incidence-of-dentinal-crack-after-root-canal-preparation-by-protaper-universal-neolix-and-safesider-systems
#9
Azadeh Harandi, Sina Mirzaeerad, Mahgol Mehrabani, Elham Mahmoudi, Ali Bijani
Introduction: This study aimed to compare the incidence of dentinal crack formation by instrumentation with ProTaper Universal system (rotary, multi-file system), SafeSider (reciprocation movement, multi-file system) and Neolix (rotary, single-file system). Methods and Materials: In this in vitro study, 60 freshly extracted mandibular first molars were randomly divided into three experimental groups (n=15) and a control group containing unprepared teeth (n=15). Instrumentation in different groups was accomplished using either ProTaper, Neolix or SafeSider systems up to 25/0...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29211285/intradentinal-antimicrobial-action-and-filling-quality-promoted-by-ultrasonic-agitation-of-epoxy-resin-based-sealer-in-endodontic-obturation
#10
Murilo Priori Alcalde, Clóvis Monteiro Bramante, Rodrigo Ricci Vivan, Pablo Andrés Amorso-Silva, Flaviana Bombarda de Andrade, Marco Antonio Hungaro Duarte
MATERIAL AND METHODS: The aim of this study was evaluate the influence of ultrasonic activation (UA) of AH Plus to improve canal and isthmus filing, and analyse the antimicrobial effect against Enterococcus faecalis within dentinal tubules. Thirty mesial roots of mandibular first molars were selected and divided into 2 groups (n = 15): with and without UA of the sealer. Then the root canals were filled by using the single cone technique, and the specimens were sectioned at 2, 4 and 6 mm from the apex for stereomicroscope and confocal laser scanner microscopy (CLSM) analysis...
November 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29208400/influence-of-cervical-preflaring-on-the-incidence-of-root-dentin-defects
#11
Álvaro Henrique Borges, Monique Sobral Damião, Thiago Machado Pereira, Gilberto Siebert Filho, Fabio Luis Miranda-Pedro, Welligton Luiz de Oliveira da Rosa, Evandro Piva, Orlando Aguirre Guedes
INTRODUCTION: This study evaluated the influence of cervical preflaring on the incidence of root dentin defects after root canal preparation. METHODS: Extracted human maxillary central incisors were selected and allocated to 1 control group and 12 experimental groups (n = 15). Teeth in the control group were left unprepared, whereas the others were prepared using 2 reciprocating single-file systems (Reciproc and WaveOne [WO]), 3 full-sequence rotary systems (ProTaper Universal, ProTaper Next [PTN], and ProFile), and K-files driven by an oscillatory system, with and without cervical preflaring...
December 2, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29207357/asbestos-containing-materials-detection-and-classification-by-the-use-of-hyperspectral-imaging
#12
Giuseppe Bonifazi, Giuseppe Capobianco, Silvia Serranti
In this work, hyperspectral imaging in the short wave infrared range (SWIR: 1000-2500nm) coupled with chemometric techniques was evaluated as an analytical tool to detect and classify different asbestos minerals, such as amosite ((Fe2+)2(Fe2+,Mg)5Si8O22(OH)2)), crocidolite (Na2(Mg,Fe)6Si8O22(OH)2) and chrysotile (Mg3(Si2O5)(OH)4), contained in cement matrices. Principal Component Analysis (PCA) was used for data exploration and Soft Independent Modeling of Class Analogies (SIMCA) for sample classification. The classification model was built using spectral characteristics of reference asbestos samples and then applied to the asbestos containing materials...
November 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29201973/the-accuracy-of-four-impression-making-techniques-in-angulated-implants-based-on-vertical-gap
#13
Abolfazl Saboury, Hamid Neshandar Asli, Zahra Dalili Kajan
Statement of the Problem: Precision of the impression taken from implant positions significantly determines accurate fit of implant-supported prostheses. An imprecise impression may produce prosthesis misfit. Purpose: This study aimed to evaluate the accuracy of four impression-making techniques for angulated implants by stereomicroscope through measuring the vertical marginal gaps between the cemented metal framework and the implant analog. Materials and Method: A definitive cast with two 15° mesially angulated implants served as the standard reference for making all the impressions and later for accuracy evaluation...
December 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29194841/marginal-and-internal-fit-of-cad-cam-crowns-fabricated-over-reverse-tapered-preparations
#14
Jeison B Carbajal Mejía, Hirofumi Yatani, Kazumichi Wakabayashi, Takashi Nakamura
PURPOSE: Intraoral digital scanning can accurately record single abutment tooth preparations despite their geometry, and the algorithms of the CAD software can be set to manage different abutment forms. The purpose of this in vitro study was to evaluate the marginal and internal fit of CAD/CAM zirconia crowns fabricated over conventional and reverse-tapered preparations. MATERIALS AND METHODS: Crown preparations with known total occlusal convergence (TOC) angles (-8°, -4°, 0°, 8°, 12°, 16°, and 22°) were digitally created from a maxillary left central incisor and printed in acrylic resin...
November 30, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29192632/effect-of-different-modes-of-erbium-yttrium-aluminum-garnet-laser-on-shear-bond-strength-to-dentin
#15
E Kucukyilmaz, M S Botsali, E Korkut, Y Sener, T Sari
OBJECTIVES: The aim of this study was to evaluate the effect of different surface treatments on the shear bond strength (SBS) of resin composites to dentin using total etch dentin bonding adhesives. MATERIALS AND METHODS: Sixty extracted human molars were flattened to obtain dentin surfaces. The samples were divided into three groups (n = 20): Group I: 37% phosphoric acid + optibond FL + resin composite; Group II: Erbium:yttrium aluminum garnet (Er:YAG) laser (medium short pulse [MSP] mode, 120 mJ/10 Hz) + optibond FL + resin composite; Group III: Er:YAG laser (quantum square pulse [QSP] mode, 120 mJ/10 Hz) + optibond FL + resin composite...
October 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29184635/effect-of-denture-cleansing-agents-on-tensile-and-shear-bond-strengths-of-soft-liners-to-acrylic-denture-base
#16
Farhang Mahboub, Fariba Salehsaber, Fereydoon Parnia, Vahedeh Gharekhani, Yousef Kananizadeh, Mahsa Taghizadeh
Background. The aim of the present study was to evaluate the effect of Corega and 2.5% sodium hypochlorite cleansing agents on the shear and tensile bond strengths of GC soft liner to denture base. Methods. A total of 144 samples (72 samples for tensile and 72 for shear bond strength evaluations) were prepared. The samples in each group were subdivided into three subgroups in terms of the cleansing agent used (2.5% sodium hypochlorite, Corega and distilled water [control group]). All the samples were stored in distilled water, during which each sample was immersed for 15 minutes daily in sodium hypochlorite or Corega solutions...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/29167706/the-effect-of-oxalate-based-desensitizers-on-the-microleakage-and-shear-bond-strength-of-resin-modified-glass-ionomer
#17
Maryam Firouzmandi, Fereshteh Valipour, Maryam Roshanzamir, Tayebeh Mobaleghi
Background: The first line of intervention to alleviate tooth sensitivity is to use dentin desensitizers such as oxalate-based desensitizers. When the dentin sensitivity continues even after application of desensitizers the next intervention would be restoration of the lesion. The aim of this in vitro study was to investigate the effect of prior application of oxalate-based desensitizer on the marginal microleakage and shear bond strength of resin modified glass ionomer (RMGI) restorations...
October 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29167688/effect-of-quaternary-ammonium-salt-on-shear-bond-strength-of-orthodontic-brackets-to-enamel
#18
Hannaneh Ghadirian, Allahyar Geramy, Farhood Najafi, Soolmaz Heidari, Hamid Golshahi
Objectives: This study sought to assess the effect of quaternary ammonium salt (QAS) on shear bond strength of orthodontic brackets to enamel. Materials and Methods: In this in vitro experimental study, 0, 10, 20 and 30% concentrations of QAS were added to Transbond XT primer. Brackets were bonded to 60 premolar teeth using the afore-mentioned adhesive mixtures, and the shear bond strength of the four groups (n=15) was measured using a universal testing machine...
May 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29167683/microleakage-of-two-bulk-fill-and-one-conventional-composite-in-class-ii-restorations-of-primary-posterior-teeth
#19
Shahram Mosharrafian, Alireza Heidari, Pegah Rahbar
Objectives: This study aimed to assess and compare the microleakage of two bulk fill and one conventional composite in class II restorations of primary posterior teeth. Materials and Methods: This in vitro, experimental study was conducted on 60 primary mandibular second molars, which were randomly divided into three groups. Standard class II cavities were prepared in teeth and restored with 3M bulk fill composite in group 1, SonicFill bulk fill composite in group 2 and Z250 conventional composite in group 3...
May 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29166420/a-comparison-of-marginal-gaps-of-all-ceramic-crowns-constructed-from-scanned-impressions-and-models
#20
Raena Tabesh, James Dudley
PURPOSE: This study compared the marginal gaps of computer-aided design/computer-aided manufacture (CAD/CAM)-fabricated all-ceramic crowns constructed from scanned impressions and models and with two different occlusal reduction designs. MATERIALS AND METHODS: Two typodont mandibular first molars were prepared to receive CAD/CAM-fabricated all-ceramic crowns. Both molars were prepared to ideal crown reduction, the first with anatomical occlusal reduction (AOR) and the second with completely flat occlusal reduction (FOR)...
November 22, 2017: International Journal of Prosthodontics
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