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https://www.readbyqxmd.com/read/28211566/applying-standard-perikymata-profiles-to-pongo-pygmaeus-canines-to-estimate-perikymata-counts-between-linear-enamel-hypoplasias
#1
Mackie O'Hara
OBJECTIVES: Recently, studies have interpreted regular spacing and average number of perikymata between dental enamel defects in orangutans to reflect seasonal episodes of physiological stress. To estimate the amount of time between developmental defects (enamel hypoplasia), studies have relied on perikymata counts. Unfortunately, perikymata are frequently not continuously visible between defects, significantly reducing data sets. A method is presented here for estimating the number of perikymata between defects using standard perikymata profiles (SPP) that allow the number of perikymata between all pairs of defects across a tooth to be analyzed...
February 17, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28210442/a-portable-fiber-optic-raman-spectrometer-concept-for-evaluation-of-mineral-content-within-enamel-tissue
#2
Anna Akkus, Shan Yang, Renato Roperto, Hathem Mustafa, Sorin Teich, Ozan Akkus
BACKGROUND: Measurement of tooth enamel mineralization using a clinically viable method is essential since variation of mineralization may be used to monitor caries risk or in assessing the effectiveness of remineralization therapy. Fiber optic Raman systems are becoming more affordable and popular in context of biomedical applications. However, the applicability of fiber optic Raman systems for measurement of mineral content within enamel tissue has not been elucidated significantly in the prior literature...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210436/effect-of-disinfecting-the-cavity-with-chlorhexidine-on-the-marginal-gaps-of-cl-v-giomer-restorations
#3
Soodabeh Kimyai, Fatemeh Pournaghi-Azar, Fereshteh Naser-Alavi, Ashkan Salari
BACKGROUND: Considering the effect of cavity disinfecting agents on the bonding and sealing ability of restorations bonded to dentin, the aim of this study was to evaluate the effect of chlorhexidine (CHX) disinfecting agent on the marginal gaps of Cl V giomer restorations. MATERIAL AND METHODS: Cl V cavities were prepared on the buccal surfaces of 60 sound bovine permanent incisors in this in vitro study, with the occlusal and gingival margins in enamel and dentin, respectively...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28208997/comparison-of-self-etch-primers-with-conventional-acid-etching-system-on-orthodontic-brackets
#4
Amit Zope, Yogita Zope-Khalekar, Shrikant S Chitko, Veerendra V Kerudi, Harshal Ashok Patil, Prasad Vasudeo Bonde, Pratik Jaltare, Siddhesh G Dolas
INTRODUCTION: The self-etching primer system consists of etchant and primer dispersed in a single unit. The etching and priming are merged as a single step leading to fewer stages in bonding procedure and reduction in the number of steps that also reduces the chance of introduction of error, resulting in saving time for the clinician. It also results in smaller extent of enamel decalcification. AIM: To compare the Shear Bond Strength (SBS) of orthodontic bracket bonded with Self-Etch Primers (SEP) and conventional acid etching system and to study the surface appearance of teeth after debonding; etching with conventional acid etch and self-etch priming, using stereomicroscope...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208995/a-comparative-analysis-of-caries-inhibitory-effect-of-remineralizing-agents-on-human-enamel-treated-with-er-yag-laser-an-in-vitro-atomic-emission-spectrometry-analysis
#5
Aswin Saseendran Nair, R Krishna Kumar, Sunil Thomas Philip, Syed Shaheed Ahameed, Sairaj Punnathara, Joby Peter
INTRODUCTION: The tug of war to maintain tooth integrity is dependent on a ratio between demineralization and remineralization. Hence, demineralization should be retarded and remineralization should be enhanced to maintain a natural equilibrium in the oral cavity. AIM: To compare in-vitro acid resistance of human enamel when using Casein Phosphopeptides Amorphous Calcium Phosphate (CPP-ACP) [GC Tooth mousse] cream, Casein Phosphopeptide Amorphous Calcium Fluoride Phosphate (CPP-ACFP) [GC Tooth mousse plus] cream, Er:YAG laser alone, combination of CPP-ACP with Er:YAG laser, CPP-ACFP with Er:YAG laser...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28206901/assessment-of-enamel-bond-strength-of-hypoplastic-primary-teeth
#6
Lisa Scheidt, Mariane Emi Sanabe, Fabrãcio Mezzomo Collares, Vicente Castelo Branco Leitune, Eduardo Bresciani, Michele Baffi Diniz
PURPOSE: The purpose of this study was to compare the enamel bond strength of hypoplastic and healthy primary teeth. METHODS: Twenty-five hypoplastic teeth (experimental group) and 25 healthy primary teeth (control group) were selected and conditioned with 35 percent orthophosphoric acid before a two-layer adhesive system (Single Bond) was applied. Composite resin (Filtek Z350) was inserted in a single application, two-mm high and one-mm in diameter, and then light-cured for 20 seconds...
October 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28203014/-influence-of-surface-treatment-with-sodium-hypochlorite-solution-on-dentin-bond-strength
#7
Y Wang, Y H Liang
OBJECTIVE: To evaluate the influence of sodium hypochlorite (NaOCl) solution used during root canal therapy on dentin bond strength. METHODS: In the study, 15 freshly extracted human third molars with complete dental crowns, caries and filling-free were selected. The occlusal enamel was removed perpendicular to the long axis of the tooth to expose middle flat surfaces of sound dentin. The occlusal dentin surfaces were then polished using 600-grit silicon papers for 1 min and rinsed with deionized water for 1 min...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203009/-digital-imaging-fiber-optic-transillumination-difoti-method-for-determining-the-depth-of-cavity
#8
J L Yu, R T Tang, L Feng, Y M Dong
OBJECTIVE: To analyze the accuracy of the digital imaging fiber optic transillumination (DIFOTI) on diagnosis of caries lesions depth using DIAGNOcam system. METHODS: This experiment adopted self-matching design. Seventy-four extracted teeth (molar: sixty-six, premolar: eight) with one caries lesions in proximity which were not damaged in surface marginal ridge were selected. Dental calculus and dental stains were removed from the extracted teeth for standby application...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28198976/role-of-candida-species-from-hiv-infected-children-in-enamel-caries-lesions-an-in-vitro-study
#9
Senda Charone, Maristela Barbosa Portela, Karol de Oliveira Martins, Rosangela Maria Soares, Gloria Fernanda Castro
Objectives: This study analyzed the capacity of Candida spp. from dental biofilm of HIV infected (HIV+) children to demineralize primary molar enamel in vitro by Transversal Microhardness (TMH), Polarized Light Microscopy (PLM) and the quantity of calcium ions (Ca2+) released from the enamel. Material and Methods: Candida spp. samples were isolated from the supragingival biofilm of HIV+ children. A hundred and forty (140) enamel blocks were randomly assigned to six groups: biofilm formed by C...
January 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28197416/evaluation-of-metal-ion-concentration-in-hard-tissues-of-teeth-in-residents-of-central-poland
#10
Piotr Wychowanski, Konrad Malkiewicz
Objectives. The aim of the study was an assessment of the content of trace elements in enamel and dentin of teeth extracted in patients residing in urban and agricultural areas of Poland. Methods. The study included 30 generally healthy patients with retained third molars. 65 samples of enamel and dentin from individuals living in urban areas and 85 samples of enamel and dentin from individuals living in agricultural areas were prepared. The content of manganese, lead, cadmium, and chromium in the studied enamel and dentin samples from retained teeth was determined by Graphite Furnace Atomic Absorption Spectrometry...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28197397/timing-considerations-on-the-shear-bond-strength-of-orthodontic-brackets-after-topical-fluoride-varnish-applications
#11
Gianguido Cossellu, Valentina Lanteri, Andrea Butera, Nicola Laffi, Alberto Merlini, Giampietro Farronato
OBJECTIVES: To assess the best temporal association between the application of a fluoride varnish on enamel and bonding procedures. MATERIALS AND METHODS: Eighty mandibular bovine incisors were used. Teeth were divided into 4 groups (20 per group); Groups 1-3 were treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent, Schaan, Liechtenstein), and Group 4 served as control with no pretreatment. Tooth were stored in deionized water (37°C) and subjected to thermal cycling for 400 (Group 1), 800 (Group 2), and 2500 (Group 3) cycles corresponding, respectively, to 15, 30, and 90 days in order to simulate the three different timing of bracket bonding...
January 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28196895/intrinsically-disordered-proteins-drive-enamel-formation-via-an-evolutionarily-conserved-self-assembly-motif
#12
Tomas Wald, Frantisek Spoutil, Adriana Osickova, Michaela Prochazkova, Oldrich Benada, Petr Kasparek, Ladislav Bumba, Ophir D Klein, Radislav Sedlacek, Peter Sebo, Jan Prochazka, Radim Osicka
The formation of mineralized tissues is governed by extracellular matrix proteins that assemble into a 3D organic matrix directing the deposition of hydroxyapatite. Although the formation of bones and dentin depends on the self-assembly of type I collagen via the Gly-X-Y motif, the molecular mechanism by which enamel matrix proteins (EMPs) assemble into the organic matrix remains poorly understood. Here we identified a Y/F-x-x-Y/L/F-x-Y/F motif, evolutionarily conserved from the first tetrapods to man, that is crucial for higher order structure self-assembly of the key intrinsically disordered EMPs, ameloblastin and amelogenin...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28196166/direct-resin-composite-restoration-of-maxillary-central-incisors-with-fractured-tooth-fragment-reattachment-case-report
#13
Monika Szmidt, Maciej Górski, Katarzyna Barczak, Jadwiga Buczkowska-Radlińska
This article presents a clinical protocol to reconstruct two accidentally damaged maxillary central incisors using composite resin material and a fractured tooth component. A patient was referred to the clinic with fracture of the two maxillary central incisors. Clinical examination revealed that both teeth were fractured in the middle third of the crown and that the fractures involved enamel and dentin with no pulp exposure. The patient had also suffered a lower lip laceration. When the lip was evaluated, a fractured fragment of the maxillary right central incisor was found inside the wound...
March 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28196163/entire-papilla-preservation-technique-a-novel-surgical-approach-for-regenerative-treatment-of-deep-and-wide-intrabony-defects
#14
Serhat Aslan, Nurcan Buduneli, Pierpaolo Cortellini
Primary wound closure and uneventful early wound stability over the biomaterials are the most critical elements of successful periodontal regeneration. Yet the surgical elevation of the interdental papilla to access deep and wide intrabony defects entails an impairment of the papillary blood supply that can result in difficult healing due to a lack of primary closure in the early healing period. This negative event might complicate the healing process, favoring bacterial contamination. A novel modified tunnel surgical technique designed to maintain the integrity of the interdental papilla is presented in this article, with the aim of providing an optimal environment for wound healing in regenerative procedures...
March 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28196135/mammalian-enamel-maturation-crystallographic-changes-prior-to-tooth-eruption
#15
Anna Kallistová, Ivan Horáček, Miroslav Šlouf, Roman Skála, Michaela Fridrichová
Using the distal molar of a minipig as a model, we studied changes in the microstructural characteristics of apatite crystallites during enamel maturation (16-23 months of postnatal age), and their effects upon the mechanical properties of the enamel coat. The slow rate of tooth development in a pig model enabled us to reveal essential heterochronies in particular components of the maturation process. The maturation changes began along the enamel-dentine junction (EDJ) of the trigonid, spreading subsequently to the outer layers of the enamel coat to appear at the surface zone with a 2-month delay...
2017: PloS One
https://www.readbyqxmd.com/read/28195749/restorative-thresholds-for-carious-lesions
#16
N P T Innes, F Schwendicke
Current evidence supports noninvasive/nonrestorative treatment of "early" carious lesions: those confined to enamel or reaching the enamel-dentin junction. The extent that dentists' thresholds for intervening restoratively have changed with this evidence is unknown. This systematic review aimed to determine dentists' and therapists' current lesion threshold for carrying our restorative interventions in adults/children and primary/permanent teeth. Embase, Medline via PubMed, and Web of Science were searched for observational studies, without language, time, or quality restrictions...
February 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28194533/the-diagnostic-accuracy-of-a-laser-fluorescence-device-and-digital-radiography-in-detecting-approximal-caries-lesions-in-posterior-permanent-teeth-an-in-vivo-study
#17
R Menem, I Barngkgei, N Beiruti, I Al Haffar, Easter Joury
The aim of this in vivo study was to test the diagnostic accuracy of a pen-type laser fluorescence (LFpen) device in detecting approximal caries lesions, in posterior permanent teeth, at the cavitation and non-cavitation thresholds, and compare it with that of digital bitewing radiography. Thirty patients (aged 18-37), who attended the Faculty of Dentistry at Damascus University for a dental examination, were consecutively screened. Ninety approximal surfaces of posterior permanent teeth without frank cavitations, enamel hypoplasia or restorations were selected and examined using the LFpen (DIAGNOdent pen) and digital bitewing radiography...
February 14, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28191797/digital-transillumination-in-caries-detection-versus-radiographic-and-clinical-methods-an-in-vivo-study
#18
Cynthia Lara-Capi, Maria Grazia Cagetti, Peter Lingström, Gianfranco Lai, Fabio Cocco, Charlotte Simark-Mattsso, Guglielmo Campus
OBJECTIVES: This paper was aimed to evaluate: a) the agreement between a near-infrared light transillumination device and clinical and radiographic examinations in caries lesion detection and b) the reliability of images captured by the transillumination device. METHODS: Two calibrated examiners evaluated the caries status in premolars and molars on 52 randomly selected subjects using: for the occlusal surfaces the transillumination device comparing it with a clinical examination, and for the approximal surfaces, the transillumination device with a radiographic examination (bitewings radiographs)...
February 13, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28191355/morquio-s-syndrome-a-case-report-of-two-siblings
#19
Sathish Muthukumar Ramalingam, Daya Srinivasan, Sandhya ArunKumar, Joe Louis ChiriyanKandath, Sriram Kaliamoorthy
Morquio syndrome or MPS IVA is a rare type of lysosomal storage disease associated with highly specific dental abnormalities. We present two siblings with enamel hypoplasia and skeletal abnormalities. A diagnosis of mucopolysaccharidosis type IVA was reached based on the clinical, radiographic, and dental findings of the patients. The dental findings are useful diagnostic aid for the early diagnosis of this debilitating disorder.
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28190815/structural-analysis-of-strontium-in-human-teeth-treated-with-surface-pre-reacted-glass-ionomer-filler-eluate-by-using-extended-x-ray-absorption-fine-structure-analysis
#20
Motohiro Uo, Takahiro Wada, Kiyotaka Asakura
The bioactive effects of strontium released from surface pre-reacted glass-ionomer (S-PRG) fillers may aid in caries prevention. In this study, the local structure of strontium taken up by teeth was estimated by extended X-ray absorption fine structure analysis. Immersing teeth into S-PRG filler eluate increased the strontium content in enamel and dentin by more than 100 times. The local structure of strontium in enamel and dentin stored in distilled water was the same as that in synthetic strontium-containing hydroxyapatite (SrHAP)...
February 11, 2017: Dental Materials Journal
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