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https://www.readbyqxmd.com/read/29148914/marginal-gap-formation-in-approximal-bulk-fill-resin-composite-restorations-after-artificial-ageing
#1
A Peutzfeldt, S Mühlebach, A Lussi, S Flury
The aim of this in vitro study was to investigate the marginal gap formation of a packable "regular" resin composite (Filtek Supreme XTE [3M ESPE]) and two flowable "bulk fill" resin composites (Filtek Bulk Fill [3M ESPE] and SDR [DENTSPLY DeTrey]) along the approximal margins of Class II restorations. In each of 39 extracted human molars (n=13 per resin composite), mesial and distal Class II cavities were prepared, placing the gingival margins below the cemento-enamel junction. The cavities were restored with the adhesive system OptiBond FL (Kerr) and one of the three resin composites...
November 17, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/29146046/influence-of-different-smear-layers-on-bond-durability-of-self-etch-adhesives
#2
Toshiki Takamizawa, Wayne W Barkmeier, Keiichi Sai, Akimasa Tsujimoto, Arisa Imai, Robert L Erickson, Mark A Latta, Masashi Miyazaki
OBJECTIVE: The purpose of this study was to determine the influence of different smear layers on enamel and dentin bond durability of various types of self-etch adhesives. METHODS: Two universal adhesives, Scotchbond Universal (SU) and Prime & Bond elect (PE); a conventional single-step self-etch adhesive, G-ænial Bond (GB); and two two-step self-etch adhesives, Optibond XTR (OX) and Clearfil SE Bond (SE) were used in this study. Shear bond strengths (SBS) and shear fatigue strengths (SFS) to human enamel and dentin were determined with different smear layer conditions...
November 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29140093/early-diagnosis-and-treatment-of-asymptomatic-vertical-enamel-and-dentin-cracks
#3
Samer S Alassaad
Asymptomatic vertical enamel and dentin cracks can lead to multiple pathologic consequences ranging from caries to pulpal involvement, periodontal involvement, complete tooth fracture, and tooth loss if intervention is postponed. Early diagnosis, using magnification, tactile examination, transillumination, and dyes, and early restorative and occlusal treatments can be incorporated into daily practice to prevent further crack propagation before asymptomatic cracks become symptomatic and cause further damage to the dentition and surrounding tissues...
November 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29137807/mapping-the-mechanical-gradient-of-human-dentin-enamel-junction-at-different-intratooth-locations
#4
Zhengzhi Wang, Kun Wang, Wanyin Xu, Xiaoyu Gong, Feiyu Zhang
OBJECTIVES: The local structures and mechanical properties within tooth dentin-enamel-junction (DEJ) regions have been focused for numerous studies. The reported results, however, remain inconsistent particularly on the functional width and gradient architecture of the DEJ. The current study aims at systematically determining the mechanical gradient of the DEJ at different intratooth locations such that a clearer understanding on the tooth properties and the potential correlations with the tooth function could be obtained...
November 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29135948/effect-of-a-lactobacillus-salivarius-probiotic-on-a-double-species-streptococcus-mutans-and-candida-albicans-caries-biofilm
#5
Wirginia Krzyściak, Dorota Kościelniak, Monika Papież, Palina Vyhouskaya, Katarzyna Zagórska-Świeży, Iwona Kołodziej, Beata Bystrowska, Anna Jurczak
The aim of the study was to evaluate the anti-cariogenic effects of Lactobacillus salivarius by reducing pathogenic species and biofilm mass in a double-species biofilm model. Coexistence of S. mutans with C. albicans can cause dental caries progression or recurrence of the disease in the future. Fifty-nine children with diagnosed early childhood caries (ECC) were recruited onto the study. The condition of the children's dentition was defined according to the World Health Organization guidelines. The participants were divided into children with initial enamel demineralization and children showing dentin damage...
November 14, 2017: Nutrients
https://www.readbyqxmd.com/read/29134721/atr-ftir-spectroscopy-and-%C3%AE-edxrf-spectrometry-monitoring-of-enamel-erosion-caused-by-medicaments-used-in-the-treatment-of-respiratory-diseases
#6
Raimundo Nonato Silva Gomes, Tanmoy T Bhattacharjee, Luis Felipe C S Carvalho, Luís Eduardo Silva Soares
Medicaments essential for alleviation of diseases may sometime adversely affect dental health by eroding the enamel, owing to their acidic nature. It is therefore highly desirable to be able to detect these effects quickly and reliably. In this study, we evaluated the erosive capacity of four most commonly prescribed respiratory disease syrup medicaments on enamel using micro-energy-dispersive X-ray fluorescence spectrometry (µ-EDXRF) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR)...
November 14, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29133967/comparison-of-marginal-microleakage-of-flowable-composite-restorations-in-primary-canine-teeth-prepared-with-high-speed-diamond-bur-er-yag-laser-and-er-cr-ysgg-laser
#7
Beheshteh Malekafzali, Mohammad Asnaashari, Fateme Javadi
Background and Objectives: Adhesive restorations have become highly popular in pediatric dentistry, and novel methods of cavity preparation with minimal patient discomfort including Er:YAG and Er,Cr:YSGG laser preparations have greatly advanced. This study aimed to compare the microleakage of composite restorations of class V cavities prepared in primary canine teeth with high-speed bur and Er:YAG and Er,Cr:YSGG lasers. Materials and Methods: This in vitro study was conducted on 30 class V cavities prepared on the buccal surfaces of primary canine teeth in three groups (n = 10) of bur preparation, Er:YAG laser and Er,Cr:YSGG laser...
September 30, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29128128/cad-fe-modeling-and-analysis-of-class-ii-restorations-incorporating-resin-composite-glass-ionomer-and-glass-ceramic-materials
#8
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Antonio Gloria, David C Watts
OBJECTIVES: To investigate the influence of specific resin-composite, glass ceramic and glass ionomer cement (GIC) material combinations in a "multi-layer" technique to replace enamel and dentin in class II mesio-occlusal-distal (MOD) dental restorations using 3D-Finite Element Analysis (FEA). METHODS: Four 3D-FE models (A-D) of teeth, adhesively restored with different filling materials, were created and analyzed in comparison with a 3D model (E) of a sound lower molar...
November 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29127359/stable-isotopes-reveal-rapid-enamel-elongation-amelogenesis-rates-for-the-early-cretaceous-iguanodontian-dinosaur-lanzhousaurus-magnidens
#9
Celina A Suarez, Hai-Lu You, Marina B Suarez, Da-Qing Li, J B Trieschmann
Lanzhousaurus magnidens, a large non-hadrosauriform iguanodontian dinosaur from the Lower Cretaceous Hekou Group of Gansu Province, China has the largest known herbivorous dinosaur teeth. Unlike its hadrosauriform relatives possessing tooth batteries of many small teeth, Lanzhousaurus utilized a small number (14) of very large teeth (~10 cm long) to create a large, continuous surface for mastication. Here we investigate the significance of Lanzhousaurus in the evolutionary history of iguanodontian-hadrosauriform transition by using a combination of stable isotope analysis and CT imagery...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29126948/polymerisation-antibacterial-and-bioactivity-properties-of-experimental-orthodontic-adhesives-containing-triclosan-loaded-halloysite-nanotubes
#10
Felipe Weidenbach Degrazia, Bruna Genari, Vicente Castelo Branco Leitune, Rodrigo Alex Arthur, Santiago Arias Luxan, Susana Maria Werner Samuel, Fabrício Mezzomo Collares, Salvatore Sauro
OBJECTIVE: To evaluate the immediate enamel bond strength, in situ degree of conversion and the polymerisation rate of three experimental orthodontic adhesives containing triclosan-loaded halloysite nanotubes. The antibacterial and bioactivity properties of such experimental materials were also assessed. MATERIALS AND METHODS: Three experimental orthodontic adhesives were formulated by incorporating triclosan-loaded halloysite nanotubes (TCN-HNT) at different concentrations (5wt%, 10wt% and 20wt%) into resin blend (Control)...
November 7, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29126633/mechanical-behavior-of-endodontically-restored-canine-teeth-effects-of-ferrule-post-material-and-shape
#11
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Fernando Zarone, David C Watts, Antonio Gloria
OBJECTIVE: To assess the effect of a ferrule design with specific post material-shape combinations on the mechanical behavior of post-restored canine teeth. METHODS: Micro-CT scan images of an intact canine were used to create a 3-D tessellated CAD model, from which the shapes of dentin, pulp and enamel were obtained and geometric models of post-endodontically restored teeth were created. Two types of 15mm post were evaluated: a quartz fiber post with conical-tapered shape, and a carbon (C) fiber post with conical-cylindrical shape...
November 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29125909/calcium-phosphate-microspheres-as-a-delivery-vehicle-for-tooth-bleaching-agents
#12
T Mellgren, T Qin, C Öhman-Mägi, Y Zhang, B Wu, W Xia, H Engqvist
Bleaching of vital teeth has become common practice in cosmetic dentistry today. Tooth sensitivity and demineralization of the enamel are, however, common side effects associated with hydrogen and carbamide peroxide bleaching. This study investigated if calcium phosphate microspheres, which have remineralizing properties, could be used as an additive without hindering the diffusion of the bleaching agent and if the spheres could be used as a carrier for carbamide peroxide. A remineralizing agent could increase the safety of bleaching and decrease the severity of its side effects...
November 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/29123323/enamel-resistance-to-demineralization-after-bracket-debonding-using-fluoride-varnish
#13
Ascensión Vicente, Antonio José Ortiz Ruiz, Miriam García López, Yolanda Martínez Beneyto, Luis-Alberto Bravo-González
The aim of this study was to evaluate the elemental content and morphology of enamel subjected to demineralization cycles after bracket debonding, adhesive remnant removal, and application of a fluoride varnish. 125 bovine teeth were divided into five groups (n = 25): 1) Intact enamel; 2) Intact enamel + demineralization cycles (DC); 3) Enamel after adhesive removal; 4)Enamel after adhesive removal + DC; 5) Enamel after adhesive removal + Profluorid + DC. The weight percentages of calcium (Ca), phosphorous (P) and fluoride (F) were calculated using energy dispersive X-ray spectroscopy (EDX)...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29119108/effect-of-endocrown-restorations-with-different-cad-cam-materials-3d-finite-element-and-weibull-analyses
#14
Laden Gulec, Nuran Ulusoy
The aim of this study was to evaluate the effects of two endocrown designs and computer aided design/manufacturing (CAD/CAM) materials on stress distribution and failure probability of restorations applied to severely damaged endodontically treated maxillary first premolar tooth (MFP). Two types of designs without and with 3 mm intraradicular extensions, endocrown (E) and modified endocrown (ME), were modeled on a 3D Finite element (FE) model of the MFP. Vitablocks Mark II (VMII), Vita Enamic (VE), and Lava Ultimate (LU) CAD/CAM materials were used for each type of design...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29117466/dental-properties-ultrastructure-and-pulp-cells-associated-with-a-novel-dspp-mutation
#15
Thantrira Porntaveetus, Thanaphum Osathanon, Nunthawan Nowwarote, Prasit Pavasant, Chalurmpon Srichomthong, Kanya Suphapeetiporn, Vorasuk Shotelersuk
OBJECTIVE: To investigate physical characteristics and behaviours of dental pulp cells of teeth isolated from a dentinogenesis imperfecta (DGI) patient with a novel DSPP mutation. SUBJECTS AND METHODS: Whole exome and Sanger sequencing were employed to identify mutations. Physical characteristics of the teeth were examined. Pulp cells' behaviors including cell proliferation, colony forming unit, osteogenic differentiation, pluripotent markers, and mesenchymal stem cell markers were investigated...
November 8, 2017: Oral Diseases
https://www.readbyqxmd.com/read/29116300/cymbopogon-citratus-essential-oil-effect-on-polymicrobial-caries-related-biofilm-with-low-cytotoxicity
#16
Maria Alcionéia Carvalho de Oliveira, Aline Chiodi Borges, Fernanda Lourenção Brighenti, Marcos José Salvador, Aline Vidal Lacerda Gontijo, Cristiane Yumi Koga-Ito
The objective of this study was to evaluate the effects of Cymbopogon citratus essential oil and its main compound (citral) against primary dental colonizers and caries-related species. Chemical characterization of the essential oil was performed by gas chromatography/mass spectroscopy (GC/MS), and the main compound was determined. Antimicrobial activity was tested against Actinomyces naeslundii, Lactobacillus acidophilus, S. gordonii, S. mitis, S. mutans, S. sanguinis and S. sobrinus. Minimum inhibitory and bactericide concentrations were determined by broth microdilution assay for streptococci and lactobacilli reference, and for clinical strains...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29116298/in-situ-effect-of-titanium-tetrafluoride-varnish-on-enamel-demineralization
#17
Adílis Kalina Alexandria, Camila Nassur, Carolina Bezerra Cavalcanti Nóbrega, Ana Maria Gondim Valença, Pedro Luiz Rosalen, Lucianne Cople Maia
The effect of a 4% titanium tetrafluoride (TiF 4 ) varnish on enamel demineralization was evaluated. Twelve volunteers participated in this double-blind, randomized crossover study. Six enamel specimens were positioned in intraoral appliances throughout four treatment stages: 4% TiF 4 varnish (experimental varnish), 5% sodium fluoride (NaF) varnish (Duraphat ® ), placebo varnish, and negative control (deionized water). After 24 h, the varnishes were removed and plaques were allowed to accumulate. A 20% sucrose solution was dripped onto enamel blocks (10x/day)...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29115979/common-oral-conditions-and-correlates-an-oral-health-survey-in-kwara-state-nigeria
#18
Abiola O Tobin, Ikeoluwapo O Ajayi
BACKGROUND: Oral diseases are one of the most prevalent health problems today with distribution and severity varying in different parts of the world and within the same country. Oral health surveys are needed to determine prevalence of oral conditions and the nature and urgency of oral health interventions. A modified version of World Health Organisation pathfinder survey methods was used to determine prevalence of oral conditions amongst 150 respondents in two local government areas in Kwara State, Nigeria...
November 7, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29114231/co-option-of-hair-follicle-keratins-into-amelogenesis-is-associated-with-the-evolution-of-prismatic-enamel-a-hypothesis
#19
Elia Beniash
Recent discovery of hair follicle keratin 75 (KRT75) in enamel raises questions about the function of this protein in enamel and the mechanisms of its secretion. It is also not clear how this protein with a very specific and narrow expression pattern, limited to the inner root sheath of the hair follicle, became associated with enamel. We propose a hypothesis that KRT75 was co-opted by ameloblasts during the evolution of Tomes' process and the prismatic enamel in synapsids.
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29114228/integrative-temporo-spatial-mineralogic-spectroscopic-and-proteomic-analysis-of-postnatal-enamel-development-in-teeth-with-limited-growth
#20
Mirali Pandya, Hui Liu, Smit J Dangaria, Weiying Zhu, Leo L Li, Shuang Pan, Moufida Abufarwa, Roderick G Davis, Stephen Guggenheim, Timothy Keiderling, Xianghong Luan, Thomas G H Diekwisch
Tooth amelogenesis is a complex process beginning with enamel organ cell differentiation and enamel matrix secretion, transitioning through changes in ameloblast polarity, cytoskeletal, and matrix organization, that affects crucial biomineralization events such as mineral nucleation, enamel crystal growth, and enamel prism organization. Here we have harvested the enamel organ including the pliable enamel matrix of postnatal first mandibular mouse molars during the first 8 days of tooth enamel development to conduct a step-wise cross-sectional analysis of the changes in the mineral and protein phase...
2017: Frontiers in Physiology
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