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https://www.readbyqxmd.com/read/28515439/the-biomechanics-behind-extreme-osteophagy-in-tyrannosaurus-rex
#1
Paul M Gignac, Gregory M Erickson
Most carnivorous mammals can pulverize skeletal elements by generating tooth pressures between occluding teeth that exceed cortical bone shear strength, thereby permitting access to marrow and phosphatic salts. Conversely, carnivorous reptiles have non-occluding dentitions that engender negligible bone damage during feeding. As a result, most reptilian predators can only consume bones in their entirety. Nevertheless, North American tyrannosaurids, including the giant (13 metres [m]) theropod dinosaur Tyrannosaurus rex stand out for habitually biting deeply into bones, pulverizing and digesting them...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28514353/-mantle-dentin-as-biomodel-of-materials-for-structural-teeth-restoration
#2
A V Starodubova, Yu A Vinnichenko, I Ya Pourovskaya, F S Rusanov
The article describes a structural element of natural teeth - mantle dentin. It has been shown that the presence of this element in the structure of a natural tooth largely ensures its strength under the influence of repeated loads in a functional oral environment and arrests crack growth at the enamel/dentine interface. This later effect is explained by the influence of a thin layer of mantle dentine, which has physical and mechanical characteristics different from that of the main dentin.
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28507826/near-infrared-imaging-for-detecting-caries-and-structural-deformities-in-teeth
#3
Keith Angelino, David A Edlund, Pratik Shah
2-D radiographs, while commonly used for evaluating sub-surface hard structures of teeth, have low sensitivity for early caries lesions, particularly those on tooth occlusal surfaces. Radiographs are also frequently refused by patients over safety concerns. Translucency of teeth in the near-infrared (NIR) range offers a non-ionizing and safe approach to detect dental caries. We report the construction of an NIR (850 nm) LED imaging system, comprised of an NIR source and an intraoral camera for rapid dental evaluations...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28499493/bifunctional-dentifrice-amorphous-polyphosphate-a-regeneratively-active-sealant-with-potent-anti-streptococcus-mutans-activity
#4
Werner E G Müller, Meik Neufurth, Maximilian Ackermann, Emad Tolba, Michael Korzhev, Shunfeng Wang, Qingling Feng, Heinz C Schröder, Xiaohong Wang
OBJECTIVE: In this study we demonstrate that inorganic polyphosphate (polyP) exhibits a dual protective effect on teeth: it elicits a strong antibacterial effect against the cariogenic bacterium Streptococcus mutans and, in form of amorphous calcium polyP microparticles (size of 100-400nm), it efficiently reseals cracks/fissures in the tooth enamel and dentin. METHODS: Three different formulations of amorphous polyP microparticles (Ca-polyP, Zn-polyP and Sr-polyP) were prepared...
May 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28496251/the-management-of-cracked-tooth-syndrome-in-dental-practice
#5
S Banerji, S B Mehta, B J Millar
Cracked tooth syndrome is a commonly encountered condition in dental practice which frequently causes diagnostic and management challenges. This paper provides an overview of the diagnosis of this condition and goes on to discuss current short and long-term management strategies applicable to dental practitioners. This paper also covers the diagnosis and management of this common condition and aims to inform clinicians of the current thinking, as well as to provide an overview of the techniques commonly used in managing cracked tooth syndrome...
May 12, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28467261/stress-reduced-direct-composites-for-the-restoration-of-structurally-compromised-teeth-fiber-design-according-to-the-wallpapering-technique
#6
S Deliperi, D Alleman, D Rudo
PURPOSE: The purpose of this work was to present a restoration technique based on an understanding of the biomechanical properties of the dentinoenamel complex (DEC) and the physical-mechanical properties of the resin-based composite including the stress generated from both polymerization shrinkage and occlusal forces. Technique Summary: The DEC is a functional interphase that provides crack tip shielding; the DEC should be preserved during restorative procedures. Dentists can design the strategic placement of restorative materials into the cavity to both resist the mode of failure and mimic the performance characteristics of the intact natural tooth...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28462180/prevalence-of-dentinogenesis-imperfecta-in-a-french-population
#7
Antoine Cassia, Georges Aoun, Abbass El-Outa, Gérard Pasquet, Robert Cavézian
BACKGROUND: Dentinogenesis imperfecta is a genetic disorder of the dentin occurring during the tooth development. It leads to many structural changes that can be identified clinically (brownish colored teeth, cracked enamel) and radiologically (globular crown, cervical constriction, short roots, and obliterated pulp chamber and/or root canals). The aim of this study was to determine by panoramic radiographs assessment the incidence of dentinogenesis imperfecta in a group of patients attending a specialized maxillofacial imaging center in Paris, France...
March 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28441274/-meth-mouth-an-interdisciplinary-review-of-a-dental-and-psychiatric-condition
#8
Cornel N Stanciu, Magdalena Glass, Brian C Muzyka, Oliver M Glass
OBJECTIVE: Chronic methamphetamine (MA) users experience many dental problems, a condition characterized as "meth mouth." These devastating effects on dentition is the main reason why many seek professional help. Here, we discuss the effects of MA on oral health and advocate for improved collaboration between dentists and mental health providers. We also introduce a dental evaluation tool with the goal of improving the quality of care for this often-marginalized patient population. METHODS: A Medline literature search (1985-2016) was conducted with keywords "meth mouth," "methamphetamine AND oral health"; "methamphetamine AND dental"; "methamphetamine AND dentist...
April 24, 2017: Journal of Addiction Medicine
https://www.readbyqxmd.com/read/28416310/cracked-teeth-and-poor-oral-masticatory-habits-a-matched-case-control-study-in-china
#9
Feng Qiao, Min Chen, Xiaoli Hu, Kaijun Niu, Xu Zhang, Yanqiu Li, Zhou Wu, Zhengyan Shen, Ligeng Wu
INTRODUCTION: Previous studies have suggested that masticatory forces are associated with cracked teeth, but it is not clear which specific poor oral masticatory habits may be more likely to cause cracks. The aim of this study was to quantitatively assess risk factors for cracked teeth among poor oral masticatory habits and create a model for individualized risk predictions. METHODS: We enrolled 35 patients with cracked teeth matched to 70 controls without cracked teeth by age, sex, position of the affected tooth, presence/absence of systemic disease, and diagnosis of symptomatic irreversible pulpitis from the Stomatology Hospital of Tianjin Medical University, Tianjin, China...
April 14, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28326726/-effects-of-different-surface-modifications-on-micro-structure-and-adhesion-of-zirconia-ceramic-an-in-vitro-study
#10
Li Siwen, Li Shishi, Wang Yanhong, Ma Hongmei
OBJECTIVE: This study evaluated the effect of different mechanical-chemical surface treatments on the characteristics, microstructure, and composition of zirconia ceramics and on the zirconia-dentin adhesion. METHODS: The sintered commercial zirconia blocks (IPS e.max ZirCAD) were sectioned into 126 beams (6 mm×6 mm×5 mm) and randomly assigned to seven experimental groups (n=18). The zirconia block specimens were further treated as follows: (A) untreated, as control; (B) sandblasted with 50 μm Al2O3; (C) sandblasted with 50 μm Al2O3+30 μm silica powder; (D) sandblasted with 50 μm Al2O3+30% silica-sol coating; (E) sandblasted with 110 μm Al2O3; (F) sandblasted with 110 μm Al2O3+30 μm silica powder; and (G) sandblasted with 110 μm Al2O3+30% silica-sol coating...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28274036/effect-of-instrumentation-length-and-instrumentation-systems-hand-versus-rotary-files-on-apical-crack-formation-an-in-vitro-study
#11
Madhuri R Devale, M C Mahesh, Shreetha Bhandary
INTRODUCTION: Stresses generated during root canal instrumentation have been reported to cause apical cracks. The smaller, less pronounced defects like cracks can later propagate into vertical root fracture, when the tooth is subjected to repeated stresses from endodontic or restorative procedures. AIM: This study evaluated occurrence of apical cracks with stainless steel hand files, rotary NiTi RaCe and K3 files at two different instrumentation lengths. MATERIALS AND METHODS: In the present in vitro study, 60 mandibular premolars were mounted in resin blocks with simulated periodontal ligament...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28261523/automatic-detection-of-tooth-cracks-in-optical-coherence-tomography-images
#12
Jun-Min Kim, Se-Ryong Kang, Won-Jin Yi
PURPOSE: The aims of the present study were to compare the image quality and visibility of tooth cracks between conventional methods and swept-source optical coherence tomography (SS-OCT) and to develop an automatic detection technique for tooth cracks by SS-OCT imaging. METHODS: We evaluated SS-OCT with a near-infrared wavelength centered at 1,310 nm over a spectral bandwidth of 100 nm at a rate of 50 kHz as a new diagnostic tool for the detection of tooth cracks...
February 2017: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/28185678/in-vitro-fatigue-and-fracture-testing-of-cad-cam-materials-in-implant-supported-molar-crowns
#13
Verena Preis, Sebastian Hahnel, Michael Behr, Laila Bein, Martin Rosentritt
OBJECTIVE: To investigate the fatigue and fracture resistance of different CAD/CAM-materials as implant- or tooth-supported molar crowns with respect to the clinical procedure (screwed/bonded restoration). METHODS: 168 crowns were fabricated from different CAD/CAM-materials (n=8/material): ZLS (zirconia-reinforced lithium silicate ceramic; Suprinity, Vita-Zahnfabrik), COB (composite; Brilliant Crios, Coltene), COL (composite; Lava Ultimate, 3M Espe), PMV/PPV (polyether ether ketone (PEEK)+milled composite veneer/composite paste veneer; BioHPP+HIPC veneer/Crealign veneer, Bredent), COH (composite; Block HC, Shofu), and ZIR (zirconia; IPS e...
April 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28183665/degradation-in-the-fatigue-crack-growth-resistance-of-human-dentin-by-lactic-acid
#14
Santiago Orrego, Huakun Xu, Dwayne Arola
The oral cavity frequently undergoes localized changes in chemistry and level of acidity, which threatens the integrity of the restorative material and supporting hard tissue. The focus of this study was to evaluate the changes in fatigue crack growth resistance of dentin and toughening mechanisms caused by lactic acid exposure. Compact tension specimens of human dentin were prepared from unrestored molars and subjected to Mode I opening mode cyclic loads. Fatigue crack growth was achieved in samples from mid- and outer-coronal dentin immersed in either a lactic acid solution or neutral conditions...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28179924/fracture-resistance-of-roots-after-application-of-different-sealers
#15
Fatemeh Dibaji, Farzaneh Afkhami, Babak Bidkhori, Mohammad Javad Kharazifard
INTRODUCTION: Vertical root fracture inevitably leads to tooth extraction. Thus, root filling with obturating materials and sealers that can reinforce the tooth would be an ideal way to reduce fracture in root treated teeth. This study aimed to assess the fracture resistance of roots following the application of different sealers including Epiphany, iRoot sealer and AH-plus. METHODS AND MATERIALS: Fifty extracted human single-canal premolars without caries, curvature or cracks were used in this study...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28168240/cracked-tooth-syndrome-mimicking-trigeminal-autonomic-cephalalgia-a-report-of-four-cases
#16
Noboru Noma, Kohei Shimizu, Kosuke Watanabe, Andrew Young, Yoshiki Imamura, Junad Khan
BACKGROUND: This report describes four cases of cracked tooth syndrome secondary to traumatic occlusion that mimicked trigeminal autonomic cephalalgias. All patients were referred by general practitioners to the Orofacial Pain Clinic at Nihon University Dental School for assessment of atypical facial pain. CLINICAL PRESENTATION: Case 1: A 51-year-old woman presented with severe pain in the maxillary and mandibular left molars. Case 2: A 47-year-old woman presented with sharp, shooting pain in the maxillary left molars, which radiated to the temple and periorbital region...
2017: Quintessence International
https://www.readbyqxmd.com/read/28160942/correlation-between-symptoms-and-external-characteristics-of-cracked-teeth-findings-from-the-national-dental-practice-based-research-network
#17
Thomas J Hilton, Ellen Funkhouser, Jack L Ferracane, Gregg H Gilbert, Camille Baltuck, Paul Benjamin, David Louis, Rahma Mungia, Cyril Meyerowitz
BACKGROUND: Cracked teeth are ubiquitous in the adult dentition. The objective of this study was to determine which patient traits and behaviors and external tooth and crack characteristics correlate with cracked teeth being symptomatic. METHODS: Dentists in The National Dental Practice-Based Research Network enrolled a convenience sample of patients each with a single, vital posterior tooth with at least 1 observable external crack in this observational study; they enrolled 2,975 cracked teeth from 209 practitioners...
April 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28150439/investigating-the-dental-toolkit-of-primates-based-on-food-mechanical-properties-feeding-action-does-matter
#18
REVIEW
Ghislain Thiery, Franck Guy, Vincent Lazzari
Although conveying an indisputable morphological and behavioral signal, traditional dietary categories such as frugivorous or folivorous tend to group a wide range of food mechanical properties together. Because food/tooth interactions are mostly mechanical, it seems relevant to investigate the dental morphology of primates based on mechanical categories. However, existing mechanical categories classify food by its properties but cannot be used as factors to classify primate dietary habits. This comes from the fact that one primate species might be adapted to a wide range of food mechanical properties...
June 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28052126/the-extent-of-the-crack-on-artificial-simulation-models-with-cbct-and-periapical-radiography
#19
Shuang Wang, Yiran Xu, Zhengyan Shen, Lijun Wang, Feng Qiao, Xu Zhang, Minghua Li, Ligeng Wu
BACKGROUND: The aim of this study was to investigate the extent of the crack of a cracked tooth on an artificial simulation model with Periapical Radiography (PR) and cone beam computed tomography (CBCT) in vitro, providing the basis for early diagnosis and an appropriate treatment plan. METHODS: Forty-four teeth with different extents of artificial cracks, created by exposure to liquid nitrogen after hot water at 100°C, were collected. They were subjected to PR and CBCT...
2017: PloS One
https://www.readbyqxmd.com/read/27995653/influence-of-misfit-on-the-occurrence-of-veneering-porcelain-fractures-chipping-in-implant-supported-metal-ceramic-fixed-dental-prostheses-an-in%C3%A2-vitro-pilot-trial
#20
Nils Löfgren, Christel Larsson, Nikos Mattheos, Martin Janda
OBJECTIVE: Technical complications such as veneer fractures are more common in implant-supported than tooth-supported restorations. The underlying causes have not been fully identified. The aim of this study was to evaluate whether misfit between the restoration and the implant may affect the risk of veneer fractures. MATERIALS AND METHODS: Twenty standardized five-unit implant-supported metal-ceramic fixed dental prostheses (FDP)s were manufactured and fixed in acrylic blocks...
December 19, 2016: Clinical Oral Implants Research
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