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https://www.readbyqxmd.com/read/29432650/effects-of-ultrasonic-removal-of-fractured-files-from-the-middle-third-of-root-canals-on-dentinal-cracks-a-micro-computed-tomography-study
#1
M Fu, X Huang, W He, B Hou
AIM: To evaluate the frequency of dentinal microcracks after ultrasonic removal of fractured files from the middle third of root canals using micro-computed tomography (micro-CT). METHODOLOGY: Eighteen bilaterally matched pairs of human mandibular incisors extracted for periodontal reasons were included. The matched pairs of teeth were then divided into a control group and an experimental group, with one member of each pair assigned to each group. In the control group, the canals were instrumented using the ProTaper Next (PTN) system...
February 12, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29429822/12-month-success-of-cracked-teeth-treated-with-orthograde-root-canal-treatment
#2
Keith V Krell, Daniel J Caplan
INTRODUCTION: Long-term studies examining the treatment outcomes of "cracked teeth" that received orthograde root canal treatment in the United States do not exist. The purpose of the present study was to examine the distribution and 1-year treatment outcomes of cracked teeth receiving orthograde root canal treatment in 1 private endodontic practice over a 25-year period. METHODS: A total of 3038 cracked teeth were initially examined, and data from 2086 unique patients were analyzed...
February 8, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29380610/in-vitro-performance-of-ultrasound-enamel-preparation-compared-with-classical-bur-preparation-on-pit-and-fissure-sealing
#3
G F Ferrazzano, A Ingenito, B Alcidi, G Sangianantoni, M G Schiavone, T Cantile
AIM: Fissure sealants are effective in preventing caries. The aim of this in vitro study was to evaluate the effects of two different enamel surface preparation techniques for pit and fissure sealing. MATERIALS AND METHODS: Sixty extracted sound third molars were used. For each tooth, the mesial half of the occlusal fissures was treated with ultrasound diamond tip T1 mounted on an ultrasonic handpiece, while the distal half with conventional diamond bur. The teeth were randomly divided into 2 groups (n = 30/each)...
December 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29289728/associations-of-types-of-pain-with-crack-level-tooth-level-and-patient-level-characteristics-in-posterior-teeth-with-visible-cracks-findings-from-the-national-dental-practice-based-research-network
#4
Thomas J Hilton, Ellen Funkhouser, Jack L Ferracane, Valeria V Gordan, Kevin D Huff, Julie Barna, Rahma Mungia, Timothy Marker, Gregg H Gilbert
OBJECTIVES: The objective of this study was to determine which patient traits, behaviors, external tooth and/or crack characteristics correlate with the types of symptoms that teeth with visible cracks exhibit, namely pain on biting, pain due to cold stimuli, or spontaneous pain. METHODS: Dentists in the National Dental Practice-Based Research Network enrolled a convenience sample of subjects each of whom had a single, vital posterior tooth with at least one observable external crack (cracked teeth); 2,858 cracked teeth from 209 practitioners were enrolled...
December 28, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29285154/impact-of-cusp-inclinations-on-dental-fractures-in-cracked-tooth-syndrome-model-and-relevant-risk-evaluation
#5
Nina Xie, Penglai Wang, Cui Wu, Wenting Song, Wen Wang, Zongxiang Liu
We explored the impact of cusp inclinations on dental fractures in cracked tooth syndrome model and formulated corresponding risk scale. Forty maxillary premolars were randomized into four groups for cusp inclination measurements by digital radiovisiography (RVG). For cracked tooth models, buccal and palatal cusp inclinations were achieved by grinding in groups I (59°-50°), II (64°-55°) and III (69°-60°), with group IV as blank control. All groups underwent compression loading test, with fracture levels recorded for statistical analysis...
December 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29275853/fractographic-analysis-of-a-split-tooth-presenting-radiographically-as-a-horizontal-root-fracture-in-an-unrestored-mandibular-second%C3%A2-molar
#6
Unni Krishnan, Alex Moule, Shaji Michael, Michael Swain
INTRODUCTION: Spontaneously catastrophic fracture of intact unrestored molar teeth is not common. Nevertheless, cracks do occur that progress apically, resulting in the complete splitting of the tooth and root. This report describes a catastrophic fracture that occurred in an unrestored mandibular second molar resulting in a previously unreported combination of a longitudinal and horizontal root fracture, appearing radiographically as a single horizontal root fracture. METHODS: Tooth fragments were examined clinically, stereoscopically, and by scanning electron microscopy...
December 21, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29275170/complete-rehabilitation-of-compromised-full-dentitions-with-adhesively-bonded-all-ceramic-single-tooth-restorations-long-term-outcome-in-patients-with-and-without-amelogenesis-imperfecta
#7
Andrea Klink, Martin Groten, Fabian Huettig
OBJECTIVES: This clinical follow-up evaluated the long-term outcome of full-mouth rehabilitations with adhesively bonded all-ceramic restorations in patients suffering from amelogenesis imperfecta (AI) or affected by extensive tooth wear including a loss of the vertical dimension of occlusion. MATERIALS AND METHODS: Included for evaluation were all patients treated with adhesively bonded monolithic single-tooth restorations made of silicate or lithium disilicate ceramics; allowing a maximum four missing teeth and a facial feldspathic veneering of LDS anterior crowns...
December 21, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29273236/effect-of-tooth-substrate-and-porcelain-thickness-on-porcelain-veneer-failure-loads-in-vitro
#8
Chunling Ge, Chad C Green, Dalene A Sederstrom, Edward A McLaren, James A Chalfant, Shane N White
STATEMENT OF PROBLEM: Bonded porcelain veneers are widely used esthetic restorations. High success and survival rates have been reported, but failures do occur. Fractures are the commonest failure mode. Minimally invasive or thin veneers have gained popularity. Increased enamel and porcelain thickness improve the strength of veneers bonded to enamel, but less is known about dentin or mixed substrates. PURPOSE: The purpose of this in vitro study was to measure the influences of tooth substrate type (all-enamel, all-dentin, or half-dentin-half-enamel) and veneer thickness on the loads needed to cause initial and catastrophic porcelain veneer failure...
December 19, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29188692/complications-of-an-ageing-dentition-part-2-restorative-management-options
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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