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https://www.readbyqxmd.com/read/29188692/complications-of-an-ageing-dentition-part-2-restorative-management-options
#1
Bryan Daniel Murchie
This is the second-part of this three-part series. The first paper discussed the occlusal and cracked tooth aetiological factors which may be responsible for restoration failure. This paper will outline the restorative options for cracked and root canal-treated teeth. It will also briefly give an overview of some of the potential endodontic complications commonly associated with failed restorations. The third, and final, part of the series will provide an overview of the previous papers and conclude with a case report...
May 2017: Dental Update
https://www.readbyqxmd.com/read/29172352/complications-of-an-ageing-dentition-part-1-occlusal-trauma-and-cracked-teeth
#2
Bryan Daniel Murchie
A growing problem in dentistry is complications associated with failing amalgam restorations that have been in place for many years. At present, there is a wide variety of treatment options available in the clinician’s armamentarium when this situation arises, however, without the correct diagnosis, the prognosis for the tooth may quickly diminish, despite the clinician’s best efforts. A confusing array of symptoms and failures may confound even the most experienced dentist, which will inevitably lead to invasive and time consuming approaches in a desperate attempt to rectify the initial problem...
April 2017: Dental Update
https://www.readbyqxmd.com/read/29169512/radiation-related-caries-assessment-through-the-international-caries-detection-and-assessment-system-and-the-post-radiation-dental-index
#3
Natalia Rangel Palmier, Ana Carolina Prado Ribeiro, Jéssica Montenegro Fonsêca, João Victor Salvajoli, Pablo Agustin Vargas, Marcio Ajudarte Lopes, Thaís Bianca Brandão, Alan Roger Santos-Silva
OBJECTIVE: Although radiation-related caries (RRC) are a well-known toxicity of head and neck radiotherapy, a clinical classification system for RRC has not yet been clinically validated. Therefore, the aim of this study was to assess whether the International Caries Detection and Assessment System (ICDAS) and the Post-Radiation Dental Index (PRDI) were viable methods for the assessment of RRC. STUDY DESIGN: Clinicopathologic data and intraoral digital photographs of 60 patients (833 teeth) affected by RRC were assessed and classified according to the ICDAS and PRDI criteria...
December 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/29167712/vertical-root-fracture-initiation-in-curved-roots-after-root-canal-preparation-a-dentinal-micro-crack-analysis-with-led-transillumination
#4
Ramón Miguéns-Vila, Benjamín Martín-Biedma, Purificación Varela-Patiño, Manuel Ruíz-Piñón, Pablo Castelo-Baz
Background: One of the causative factors of root defects is the increased friction produced by rotary instrumentation. A high canal curvature may increase stress, making the tooth more susceptible to dentinal cracks. The purpose of this study was to evaluate dentinal micro-crack formation with the ProTaper NEXT and ProTaper Universal systems using LED transillumination, and to analyze the micro-crack generated at the point of maximum canal curvature. Material and Methods: 60 human mandibular premolars with curvatures between 30-49° and radii between 2-4 mm were used...
October 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29142882/incidence-of-apical-crack-formation-and-propagation-during-removal-of-root-canal-filling-materials-with-different-engine-driven-nickel-titanium-instruments
#5
Taha Özyürek, Vildan Tek, Koray Yılmaz, Gülşah Uslu
Objectives: To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. Materials and Methods: The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29140093/early-diagnosis-and-treatment-of-asymptomatic-vertical-enamel-and-dentin-cracks
#6
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/29079053/dehydration-induces-cracking-in-root-dentin-irrespective-of-instrumentation-a-two-dimensional-and-three-dimensional-study
#7
Hagay Shemesh, Tom Lindtner, Carlos Aznar Portoles, Paul Zaslansky
INTRODUCTION: Water loss strongly affects the mechanical behavior of dentin. Micro-computed tomography (μCT) studies exploring the influence of endodontic procedures on root cracking often lack information on the hydration state of the scanned samples. This study explores the relationship between dehydration and crack formation in root dentin with and without endodontic instrumentation. METHODS: Fifty-three extracted teeth were used. Thirty canals were not instrumented, and 23 canals were instrumented with ProTaper files until F3...
October 24, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29078196/durability-of-adhesive-bonds-to-tooth-structure-involving-the-dej
#8
Enas Elbahie, Dylan Beitzel, Mustafa Murat Mutluay, Hessam Majd, Mobin Yahyazadehfar, Dwayne Arola
The importance of the Dentin Enamel Junction (DEJ) to the durability of adhesive bonds to tooth structure is unclear. In fact, no investigation has been reported on contributions of the DEJ to the fatigue resistance of the bonded interface. In this study, the durability of adhesive bonds to tooth structure involving the DEJ was quantified and compared to that of adhesive bonds to enamel only, not including the DEJ. Two different configurations of enamel bonding were considered, including when tensile stress is focused on the outer enamel (occlusal configuration) or the inner decussated enamel (decussated configuration)...
October 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29060873/tooth-cracks-detection-and-gingival-sulcus-depth-measurement-using-optical-coherence-tomography
#9
Se-Ryong Kang, Jun-Min Kim, Sul-Hee Kim, Hee-Jung Park, Tae-Il Kim, Won-Jin Yi
The aims of this study were to develop an automatic detection technique for tooth cracks and to suggest quantitative methods for measuring gingival sulcus depth using swept-source optical coherence tomography (SS-OCT). We evaluated SS-OCT with wavelength centered at 1310 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 and gingival sulcus depth. The reliability of the SS-OCT images was verified by imaging the crack in extracted human teeth and gingival sulcus of porcine sample...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29037418/was-mesopithecus-a-seed-eating-colobine-assessment-of-cracking-grinding-and-shearing-ability-using-dental-topography
#10
Ghislain Thiery, Geoffrey Gillet, Vincent Lazzari, Gildas Merceron, Franck Guy
Extant colobine monkeys have been historically described as specialized folivores. However, reports on both their behavior and dental metrics tend to ascribe a more varied diet to them. In particular, several species, such as Pygathrix nemaeus and Rhinopithecus roxellana, are dedicated seasonal seed eaters. They use the lophs on their postcanine teeth to crack open the hard endocarp that protects some seeds. This raises the question of whether the bilophodont occlusal pattern of colobine monkeys first evolved as an adaptation to folivory or sclerocarpic foraging...
November 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28941585/a-comparative-study-on-the-wear-behavior-of-a-polymer-infiltrated-ceramic-network-picn-material-and-tooth-enamel
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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