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https://www.readbyqxmd.com/read/28812169/bond-strength-of-etch-and-rinse-and-self-etch-adhesive-systems-to-enamel-and-dentin-irradiated-with-a-novel-co2-9-3%C3%A2-%C3%AE-m-short-pulsed-laser-for-dental-restorative-procedures
#1
Peter Rechmann, N Bartolome, R Kinsel, R Vaderhobli, B M T Rechmann
The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used...
August 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28809925/salivary-peptidome-profiling-analysis-for-occurrence-of-new-carious-lesions-in-patients-with-severe-early-childhood-caries
#2
Chang Tian, Xiangyu Sun, Xiaochen Liu, Xin Huang, Feng Chen, Shuguo Zheng
This study aimed to identify differences of peptide profiles in stimulated whole saliva among children with and without occurrence of new carious lesions, and to provide a simple way for early diagnosis and prevention of the relapse of severe early childhood caries (s-ECC). Overall, 26 children aged 3-4 years were selected out from all the children in the kindergarten to be involved in the present study, among them 13 were diagnosed as s-ECC and underwent dental treatment, whilst the other 13 were matched by age and sex as control...
2017: PloS One
https://www.readbyqxmd.com/read/28808205/farnesol-inhibits-development-of-caries-by-augmenting-oxygen-sensitivity-and-suppressing-virulence-associated-gene-expression-instreptococcus-mutans
#3
Li Cao, Zhen-Zhen Zhang, Shuang-Bo Xu, Ming Ma, Xin Wei
Streptococcus mutans is a primary etiological agent of dental caries. Farnesol, as a potential antimicrobial agent, inhibits the development ofS. mutans biofilm. In this study, we hypothesized that farnesol inhibits caries development in vitro and interferes with biofilm formation by regulating virulence-associated gene expression. The inhibitory effects of farnesol to S. mutans biofilms on enamel surfaces were investigated by determining micro-hardness and calcium measurements. Additionally, the morphological changes ofS...
July 13, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28783550/characterization-of-the-clustered-regularly-interspaced-short-palindromic-repeats-sites-in-streptococcus-mutans-isolated-from-early-childhood-caries-patients
#4
Jing Chen, Tiancheng Li, Xuedong Zhou, Lei Cheng, Yuanyuan Huo, Jing Zou, Yuqing Li
OBJECTIVE: The aim of this study was to analyze the characteristics of the clustered regularly interspaced short palindromic repeats (CRISPR) sites in 45 clinical Streptococcus mutans strains and their relationship to the clinical manifestations of early childhood caries (ECC). METHODS: Forty-five S. mutans strains were isolated from the plaque samples taken from sixty-three children. CRISPR sites were sequenced and BLAST was used to compare these sites to those in the CRISPRTarget database...
July 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28762194/selective-removal-of-carious-lesion-with-er-yag-laser-followed-by-dentin-biomodification-with-chitosan
#5
Fabiana A Curylofo-Zotti, Gabriela Solano Tanta, Miriane Lucindo Zucoloto, Aline E Souza-Gabriel, Silmara A M Corona
The aim of this study was to evaluate the effect of Er:YAG laser for selective removal of carious lesion, followed by biomodification with chitosan gel where the subsurface microhardness, chemical composition, and morphological changes of the residual caries-affected dentin were examined. Artificial dentinal lesions were created by pH-cycling method (14 days) in 104 bovine specimens (5 × 5 mm). Specimens were randomly divided according to the carious removal method: bur (low-speed handpiece) or Er:YAG laser (250 mJ/4 Hz)...
August 1, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28703572/development-of-epigallocatechin-3-gallate-encapsulated-nanohydroxyapatite-mesoporous-silica-for-therapeutic-management-of-dentin-surface
#6
Jian Yu, Hongye Yang, Kang Li, Hongyu Ren, Jinmei Lei, Cui Huang
In dental clinic, unsatisfactory management of the dentin surface after dentin exposure often leads to the occurrence of dentin hypersensitivity and caries. Current approaches can occlude the tubules on the dentin surface to relieve dentin hypersensitivity; however, the blocked tubules are generally weak in combating daily tooth erosion and abrasion. Moreover, cariogenic bacteria, such as Streptococcus mutans, produce biofilm on the dentin surface, causing caries and compromising the tubules' sealing efficacy...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28690360/absorption-transmission-measurements-of-psap-particle-laden-filters-from-the-biomass-burning-observation-project-bbop-field-campaign
#7
Cary Presser, Ashot Nazarian, Joseph M Conny, Duli Chand, Arthur Sedlacek, John M Hubbe
Absorptivity measurements with a laser-heating approach, referred to as the laser-driven thermal reactor (LDTR), were carried out in the infrared and applied at ambient (laboratory) non-reacting conditions to particle-laden filters from a three-wavelength (visible) particle/soot absorption photometer (PSAP). The particles were obtained during the Biomass Burning Observation Project (BBOP) field campaign. The focus of this study was to determine the particle absorption coefficient from field-campaign filter samples using the LDTR approach, and compare results with other commercially available instrumentation (in this case with the PSAP, which has been compared with numerous other optical techniques)...
2017: Aerosol Science and Technology: the Journal of the American Association for Aerosol Research
https://www.readbyqxmd.com/read/28669068/evaluation-of-laser-fluorescence-in-monitoring-non-cavitated-caries-lesion-progression-on-smooth-surfaces-in-vitro
#8
J A Rodrigues, C S Sarti, C M Assunção, R A Arthur, A Lussi, M B Diniz
The aim of this study was to evaluate the performance of a pen-type laser fluorescence (LF) device (LFpen: DIAGNOdent pen) to detect and monitor the progression of caries-like lesions on smooth surfaces. Fifty-two bovine enamel blocks were submitted to three different demineralisation cycles for caries-like lesion induction using Streptococcus mutans, Lactobacillus casei and Actinomyces naeslundii. At baseline and after each cycle, the enamel blocks were analysed under Knoop surface micro-hardness (SMH) and an LFpen...
July 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28668766/effect-of-arginine-on-the-growth-and-biofilm-formation-of-oral-bacteria
#9
Xuelian Huang, Keke Zhang, Meng Deng, Robertus A M Exterkate, Chengcheng Liu, Xuedong Zhou, Lei Cheng, Jacob M Ten Cate
BACKGROUND: Alkali production via arginine deiminase system (ADS) of oral bacteria plays a significant role in oral ecology, pH homeostasis and inhibition of dental caries. ADS activity in dental plaque varies greatly between individuals, which may profoundly affect their susceptibility to caries. OBJECTIVE: To investigate the effect of arginine on the growth and biofilm formation of oral bacteria. METHODS AND RESULTS: Polymicrobial dental biofilms derived from saliva were formed in a high-throughput active attachment biofilm model and l-arginine (Arg) was shown to reduce the colony forming units (CFU) counts of such biofilms grown for various periods or biofilms derived from saliva of subjects with different caries status...
June 24, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28666212/time-kill-kinetic-analysis-of-antimicrobial-chemotherapy-based-on-hydrogen-peroxide-photolysis-against-streptococcus-mutans-biofilm
#10
Midori Shirato, Keisuke Nakamura, Taro Kanno, Peter Lingström, Yoshimi Niwano, Ulf Örtengren
A recently developed antimicrobial technique utilizing hydroxyl radicals generated by hydrogen peroxide (H2O2) photolysis represents a promising new therapy for preventing and treating dental caries. The present study compared the antimicrobial time-kill kinetics of H2O2 photolysis, conventional antiseptics, and antimicrobial photodynamic therapy (aPDT) against biofilm-forming Streptococcus mutans (cariogenic bacteria) grown on hydroxyapatite disks. H2O2 photolysis was performed by irradiating the biofilm immersed in 3% H2O2 with 365-nm light-emitting diode (LED) light at an irradiance of 1000mW/cm(2) for up to 1...
June 21, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28662857/glass-ceramic-coating-material-for-the-co2-laser-based-sintering-of-thin-films-as-caries-and-erosion-protection
#11
Marin Dean Bilandžić, Susanne Wollgarten, Jochen Stollenwerk, Reinhart Poprawe, Marcella Esteves-Oliveira, Horst Fischer
OBJECTIVES: The established method of fissure-sealing using polymeric coating materials exhibits limitations on the long-term. Here, we present a novel technique with the potential to protect susceptible teeth against caries and erosion. We hypothesized that a tailored glass-ceramic material could be sprayed onto enamel-like substrates to create superior adhesion properties after sintering by a CO2 laser beam. METHODS: A powdered dental glass-ceramic material from the system SiO2-Na2O-K2O-CaO-Al2O3-MgO was adjusted with individual properties suitable for a spray coating process...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28656929/effect-of-erbium-yttrium-aluminum-garnet-laser-on-bond-strength-of-a-total-etch-adhesive-system-to-caries-affected-dentin-on-gingival-wall
#12
F Cebe, M Bulbul, I Simsek, M A Cebe, B Ozturk
PURPOSE: To assess the effect of the erbium:yttrium aluminum garnet (Er:YAG) laser on bond strength of a total-etch adhesive system to the caries-affected dentin on the gingival wall. MATERIALS AND METHODS: Ten human molars with proximal carious lesions were randomly divided into two groups. In the first group, the carious dentin was removed with a bur, whereas in the second group it was removed with the Er:YAG laser. Carious lesions were excavated with one of these two techniques until laser fluorescence values decreased to 15 in the center of the lesions...
June 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28653255/clinical-evaluation-of-near-infrared-light-transillumination-in-approximal-dentin-caries-detection
#13
Gokhan Ozkan, Kadriye Gorkem Ulu Guzel
The objective of this clinical study was to compare conventional caries detection techniques, pen-type laser fluorescence device, and near-infrared light transillumination method in approximal dentin caries lesions. The study included 157 patients, aged 12-18, without any cavity in the posterior teeth. Two calibrated examiners carried out the assessments of selected approximal caries sites independently. After the assessments, the unopened sites were excluded and a total of 161 approximal sites were included in the study...
August 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28626285/selective-laser-ablation-of-carious-lesions-using-simultaneous-scanned-near-ir-diode-and-co2-lasers
#14
Kenneth H Chan, Daniel Fried
Previous studies have established that carious lesions can be imaged with high contrast using near-IR wavelengths coincident with high water absorption, namely 1450-nm, without the interference of stains. It has been demonstrated that computer-controlled laser scanning systems utilizing IR lasers operating at high pulse repetition rates can be used for serial imaging and selective removal of caries lesions. In this study, a point-to-point scanning system was developed integrating a 1450-nm diode laser with the CO2 ablation laser...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28621326/resin-infiltration-of-deproteinised-natural-occlusal-subsurface-lesions-improves-initial-quality-of-fissure-sealing
#15
Andrej M Kielbassa, Ina Ulrich, Rita Schmidl, Christoph Schüller, Wilhelm Frank, Vanessa D Werth
The aim of this ex vivo study was to evaluate the infiltration capability and rate of microleakage of a low-viscous resin infiltrant combined with a flowable composite resin (RI/CR) when used with deproteinised and etched occlusal subsurface lesions (International Caries Detection and Assessment System code 2). This combined treatment procedure was compared with the exclusive use of flowable composite resin (CR) for fissure sealing. Twenty premolars and 20 molars revealing non-cavitated occlusal carious lesions were randomly divided into two groups and were meticulously cleaned and deproteinised using NaOCl (2%)...
June 2017: International Journal of Oral Science
https://www.readbyqxmd.com/read/28604585/development-and-validation-of-a-new-near-infrared-sensor-to-measure-polyethylene-glycol-peg-concentration-in-water
#16
Olivier Buzzi, Shengyang Yuan, Benjamin Routley
A near-infrared absorption based laser sensor has been designed and validated for the real-time measurement of polyethylene glycol (PEG) concentration. The wavelength was selected after the determination of the absorption spectrum of deionised water and PEG solutions using a Varian Cary 6000i spectrophotometer, in order to limit the influence of PEG molecular mass on the absorption measurement. With this new sensor, the water is treated as the attenuating species and the addition of PEG in water reduces the absorbance of the medium...
June 10, 2017: Sensors
https://www.readbyqxmd.com/read/28598190/paediatric-laser-dentistry-part-2-hard-tissue-laser-applications
#17
G Olivi, C Caprioglio, M Olivi, M D Genovese
Erbium lasers can provide effective and minimally invasive caries removal in children. The bonding phase remains a critic step as well as the choice of material. Glass ionomers exhibits lower bonding properties in laser irradiated teeth compared to the conventional method or to composite and resin modified glass ionomer. Laser can also provide effective decontamination and coagulation effects in vital and non vital pulp therapy of primary teeth, improving and simplifying the cleaning and disinfecting steps.
June 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28587519/inactivation-of-a-putative-efflux-pump-lmrb-in-streptococcus-mutans-results-in-altered-biofilm-structure-and-increased-exopolysaccharide-synthesis-implications-for-biofilm-resistance
#18
Jia Liu, Jianying Zhang, Lihong Guo, Wei Zhao, Xiaoli Hu, Xi Wei
Efflux pumps are a mechanism associated with biofilm formation and resistance. There is limited information regarding efflux pumps in Streptococcus mutans, a major pathogen in dental caries. The aim of this study was to investigate potential roles of a putative efflux pump (LmrB) in S. mutans biofilm formation and susceptibility. Upon lmrB inactivation and antimicrobial exposure, the biofilm structure and expression of other efflux pumps were examined using confocal laser scanning microscopy (CLSM) and qRT-PCR...
June 7, 2017: Biofouling
https://www.readbyqxmd.com/read/28580954/single-stage-plasma-based-correlated-energy-spread-compensation-for-ultrahigh-6d-brightness-electron-beams
#19
G G Manahan, A F Habib, P Scherkl, P Delinikolas, A Beaton, A Knetsch, O Karger, G Wittig, T Heinemann, Z M Sheng, J R Cary, D L Bruhwiler, J B Rosenzweig, B Hidding
Plasma photocathode wakefield acceleration combines energy gains of tens of GeV m(-1) with generation of ultralow emittance electron bunches, and opens a path towards 5D-brightness orders of magnitude larger than state-of-the-art. This holds great promise for compact accelerator building blocks and advanced light sources. However, an intrinsic by-product of the enormous electric field gradients inherent to plasma accelerators is substantial correlated energy spread-an obstacle for key applications such as free-electron-lasers...
June 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28571282/microhardness-and-penetration-of-artificial-white-spot-lesions-treated-with-resin-or-colloidal-silica-infiltration
#20
Jyothi Mandava, Y Shilpa Reddy, Sirisha Kantheti, Uma Chalasani, Ravi Chandra Ravi, Roopesh Borugadda, Ravi Kumar Konagala
INTRODUCTION: Infiltration of early enamel lesions by materials having remineralizing capacity seems to improve aesthetics and arrests caries progression. AIM: To evaluate and compare the surface microhardness and penetration depth of a low viscosity resin and colloidal silica nanoparticle infiltrates into artificially created white spot lesions. MATERIALS AND METHODS: Forty extracted human central incisors were embedded in acrylic resin blocks exposing the labial surfaces of the crowns...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
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