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https://www.readbyqxmd.com/read/28941585/a-comparative-study-on-the-wear-behavior-of-a-polymer-infiltrated-ceramic-network-picn-material-and-tooth-enamel
#1
Zhou Xu, Ping Yu, Dwayne D Arola, Jie Min, Shanshan Gao
OBJECTIVE: To investigate the wear mechanisms of a polymer infiltrated ceramic network (PICN) material, to compare its wear behavior with that of tooth enamel, and to provide evidence relevant to its clinical use. METHODS: The Vickers hardness (HV) and elastic modulus (E) of a commercial PICN material (ENAMIC) and enamel were measured. Reciprocating wear tests were performed under a ball-on-flat configuration. Three wear pairs were explored including ENAMIC and enamel subjected to Si3N4 ball antagonists and ENAMIC subjected to enamel cusp antagonists...
September 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28862590/the-compression-dome-concept-the-restorative-implications
#2
Graeme Milicich
Evidence now supports the concept that the enamel on a tooth acts like a compression dome, much like the dome of a cathedral. With an overlying enamel compression dome, the underlying dentin is protected from damaging tensile forces. Disruption of a compression system leads to significant shifts in load pathways. The clinical restorative implications are significant and far-reaching. Cutting the wrong areas of a tooth exposes the underlying dentin to tensile forces that exceed natural design parameters. These forces lead to crack propagation, causing flexural pain and eventual fracture and loss of tooth structure...
September 2017: General Dentistry
https://www.readbyqxmd.com/read/28828148/spectrophotometric-analysis-of-crown-discoloration-following-the-use-of-silver-nanoparticles-combined-with-calcium-hydroxide-as-intracanal-medicament
#3
Farzaneh Afkhami, Sadaf Elahy, Alireza Mahmoudi-Nahavandi
BACKGROUND: Optimal antibacterial efficacy of intracanal medicaments containing silver nanoparticles (Ag-NPs) has been well documented. However, concerns remain regarding the effect of Ag-NPs on tooth color. This study aimed to assess the effects of calcium hydroxide (CH) mixed with Ag-NPs as intracanal medicaments on tooth color. The effect of location of application of medicament on the degree of discoloration was evaluated as well. MATERIAL AND METHODS: Fifty extracted single-rooted, single-canal human teeth with straight roots, no caries, no cracks or fractures were collected and accessed...
July 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28756865/influence-of-remaining-coronal-tooth-structure-on-fracture-resistance-and-failure-mode-of-restored-endodontically-treated-maxillary-incisors
#4
Domingo Santos Pantaleón, Brian R Morrow, David R Cagna, Cornelis H Pameijer, Franklin Garcia-Godoy
STATEMENT OF PROBLEM: Limited information is available on the effect of an incomplete ferrule because of the varying residual axial wall heights and the volume of residual tooth structure on the fracture resistance of endodontically treated and restored maxillary incisors. PURPOSE: The purpose of this in vitro investigation was to examine the effect of varying residual axial wall heights, residual coronal tooth structure, and the absence of 1 proximal axial wall on the fracture resistance and failure mode of endodontically treated teeth restored with metal posts...
July 27, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28748049/effect-of-different-nickel-titanium-rotary-files-on-dentinal-crack-formation-during-retreatment-procedure
#5
Mehmet Çitak, Taha Özyürek
Background. The aim of this study was to compare the dentinal defects caused by Reciproc, TF Adaptive and ProTaper Next NiTi rotary file systems during the retreatment procedure. Methods. A total of 150 mandibular incisors with straight and single root canals were included in the present study. All the root canals were prepared up to an apical diameter 0.40 mm using stainless steel files. Thirty teeth were randomly stored as the negative control group. A total of 120 specimens were obturated with gutta-percha and AH Plus sealer using vertical compaction technique...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28734650/treatment-of-cracked-teeth
#6
Shaymaa Alkhalifah, Halimah Alkandari, Prem N Sharma, Alex J Moule
Although many options are proposed for the treatment of cracked posterior teeth, most treatment decisions are not evidence based. Thus, considerable individual variation can occur regarding treatment recommendations for the same scenario. To our knowledge, there are no studies in the literature assessing practitioners' attitudes toward the treatment of cracked teeth. This research recorded variations between general practitioners and specialist groups regarding the treatment approaches of cracked teeth. In a cross-sectional structured questionnaire survey, 32 prosthodontists, 34 endodontists, and 29 general practitioners working in public and private dental health services in Kuwait were assessed regarding their treatment approach to 5 different clinical cracked tooth scenarios...
July 19, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28711375/the-prevalence-of-orodental-trauma-during-epileptic-seizures-in-terms-of-dental-treatment-survey-study
#7
Dominika Gawlak, Joanna Łuniewska, Wiktoria Stojak, Anahit Hovhannisyan, Anna Stróżyńska, Katarzyna Mańka-Malara, Marcin Adamiec, Andrzej Rysz
INTRODUCTION: Epilepsy is one of the most common neurological disorders. Seizures that occur during attacks may lead to head injuries. It is crucial to establish proper prophylactic management against trauma occurrence, as nowadays prevention is not sufficient. AIM: Assessment of the frequency of head and intraoral trauma during epileptic seizures and to evaluate factors that may predispose to injuries. MATERIAL AND METHODS: The questionnaire was carried out among 106 patients with epilepsy...
June 29, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28700729/the-association-between-electronic-cigarette-use-and-self-reported-oral-symptoms-including-cracked-or-broken-teeth-and-tongue-and-or-inside-cheek-pain-among-adolescents-a-cross-sectional-study
#8
Jun Ho Cho
BACKGROUND: Little is known about oral health related to electronic-cigarette (EC) use, even though EC use is increasing rapidly. The aim of this study is to assess the relationship between EC use and oral health, including 'gingival pain and/or bleeding', 'tongue and/or inside-cheek pain', and 'cracked or broken teeth' among adolescents. METHODS: A total of 65,528 students in 2016 were included in this cross-sectional study. RESULTS: For EC use, 0...
2017: PloS One
https://www.readbyqxmd.com/read/28624073/predicting-extension-of-cracks-to-the-root-from-the-dimensions-in-the-crown-a-preliminary-in%C3%A2-vitro-study
#9
Min Chen, Kaiyu Fu, Feng Qiao, Xu Zhang, Yi Fan, Lijun Wang, Peng Li, Zhou Wu, Ligeng Wu
BACKGROUND: In this study, the authors investigated whether extension of a tooth crack into the root can be predicted by the appearance of the crack in the crown in vitro. METHODS: The authors obtained 22 cracked teeth from 22 patients who underwent extraction, and they scanned the teeth using microcomputed tomography. The length and width of the crack on the occlusal surface (LOS and WOS, respectively) and the length of the crack on the proximal surface (LCPS) were measured on 3-dimensional reconstruction images...
June 14, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28515439/the-biomechanics-behind-extreme-osteophagy-in-tyrannosaurus-rex
#10
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
#11
REVIEW
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
#12
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
#13
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...
July 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
#14
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
#15
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
#16
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
#17
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...
July 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
#18
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...
June 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
#19
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
#20
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
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