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Dental fatigue

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https://www.readbyqxmd.com/read/27880023/effect-of-cyclic-fatigue-tests-on-aging-and-their-translational-implications-for-survival-of-all-ceramic-tooth-borne-single-crowns-and-fixed-dental-prostheses
#1
REVIEW
Mutlu Özcan, Moritz Jonasch
PURPOSE: The objective of this systematic review was to elaborate the aging effect of cyclic fatigue tests on mechanical durability of all-ceramic single crowns and fixed dental prostheses (FDP). MATERIALS AND METHODS: Original scientific papers published in the MEDLINE (PubMed) database in English between 01/01/1950 and 12/31/2013 on cyclic loading on all-ceramics were included in this systematic review. The following MeSH terms, search terms, and their combinations were used: "in vitro," "stress mechanical," "crowns," "denture, partial, fixed," "dentistry," "fatigue," "all-ceramic," "zirconia," "fixed dental prosthesis," "FDP," "bridges," and "cyclic loading...
November 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27871481/impacts-of-contracted-endodontic-cavities-on-instrumentation-efficacy-and-biomechanical-responses-in-maxillary-molars
#2
Brent Moore, Konstantinos Verdelis, Anil Kishen, Thuan Dao, Shimon Friedman
INTRODUCTION: Recently, we reported that in mandibular molars contracted endodontic cavities (CECs) improved fracture strength compared with traditional endodontic cavities (TECs) but compromised instrumentation efficacy in distal canals. This study assessed the impacts of CECs on instrumentation efficacy and axial strain responses in maxillary molars. METHODS: Eighteen extracted intact maxillary molars were imaged with micro-computed tomographic imaging (12-μm voxel), assigned to CEC or TEC groups (n = 9/group), and accessed accordingly...
December 2016: Journal of Endodontics
https://www.readbyqxmd.com/read/27859976/fatigue-failure-of-narrow-implants-with-different-implant-abutment-connection-designs
#3
Dimorvan Bordin, Lukasz Witek, Vinícius P Fardin, Estevam A Bonfante, Paulo G Coelho
PURPOSE: To evaluate the reliability of narrow diameter dental implants (NDIs) with similar macrogeometry and 3 implant-abutment connection designs. MATERIALS AND METHODS: Eighty-four NDIs (3.5 × 10 mm) were selected and divided into 4 groups (n = 21/group) according to implant-abutment connection design, as follows: EH - external hexagon, IH - internal hexagon, IC - internal conical, and IC-M - internal conical connected to a monolithic titanium abutment. Identical abutments were torqued to the implants, and standardized maxillary incisor crowns were cemented and subjected to step-stress accelerated life testing (SSALT) in water...
November 18, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27770436/effect-of-sodium-hypochlorite-and-saline-on-cyclic-fatigue-resistance-of-waveone-gold-and-reciproc-reciprocating-instruments
#4
A M Elnaghy, S E Elsaka
AIM: To compare the cyclic fatigue resistance of WaveOne Gold (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA) and Reciproc (VDW, Munich, Germany) reciprocating instruments during immersion in sodium hypochlorite (NaOCl) and saline solutions at body temperature. METHODOLOGY: A total of 180 new WaveOne Gold primary size 25, .07 taper, and Reciproc size 25, .08 taper were randomly divided into three groups: group 1: no immersion (control, air); group 2: immersion in saline at 37 ± 1 °C; and group 3: immersion in 5% NaOCl at 37 ± 1 °C...
October 21, 2016: International Endodontic Journal
https://www.readbyqxmd.com/read/27694784/myogenic-temporomandibular-disorders-clinical-systemic-comorbidities-in-a-female-population-sample
#5
M de-Pedro-Herráez, J Mesa-Jiménez, C Fernández-de-Las-Peñas, J-L de-la-Hoz-Aizpurua
BACKGROUND: Myogenic temporomandibular disorders (MTMD) frequently coexist with other clinical conditions in the same individual. In the last decades, several authors have analyzed these comorbidities looking for the origin of this overlapping. Objetives: The aim of this study was to perform a comparative anaylisis between a group of patients with MTMD and a control group of dental patients without dysfunctional pathology to assess whether there are significant differences in the presence of systemic medical comorbidities between the two groups...
November 1, 2016: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/27680671/survival-and-failure-modes-platform-switching-for-internal-and-external-hexagon-cemented-fixed-dental-prostheses
#6
Rodolfo B Anchieta, Lucas S Machado, Ronaldo Hirata, Paulo G Coelho, Estevam A Bonfante
This study evaluated the probability of survival (reliability) of platform-switched fixed dental prostheses (FDPs) cemented on different implant-abutment connection designs. Eighty-four-three-unit FDPs (molar pontic) were cemented on abutments connected to two implants of external or internal hexagon connection. Four groups (n = 21 each) were established: external hexagon connection and regular platform (ERC); external hexagon connection and switched platform (ESC); internal hexagon and regular platform (IRC); and internal hexagon and switched platform (ISC)...
October 2016: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/27661621/utilization-of-routine-primary-care-services-among-dancers
#7
Stephanie Alimena, Mary E Air, Caitlin Gribbin, Elizabeth Manejias
This study examines the current utilization of primary and preventive health care services among dancers in order to assess their self-reported primary care needs. Participants were 37 dancers from a variety of dance backgrounds who presented for a free dancer health screening in a large US metropolitan area (30 females, 7 males; mean age: 27.5 ± 7.4 years; age range: 19 to 49 years; mean years of professional dancing: 6.4 ± 5.4 years). Dancers were screened for use of primary care, mental health, and women's health resources using the Health Screen for Professional Dancers developed by the Task Force on Dancer Health...
2016: Journal of Dance Medicine & Science
https://www.readbyqxmd.com/read/27639822/significance-and-implications-of-patient-reported-xerostomia-in-sj%C3%A3-gren-s-syndrome-findings-from-the-national-institutes-of-health-cohort
#8
Monisha Billings, Bruce A Dye, Timothy Iafolla, Alan N Baer, Margaret Grisius, Ilias Alevizos
BACKGROUND: Xerostomia is a chief complaint of patients with Sjögren's syndrome (SS). However, newer proposals for SS classification remove xerostomia and hyposalivation from the criteria list. Given these developments and the importance of patient-centered research outcomes, we sought to evaluate the utility of patient-reported xerostomia with implications for classification criteria, and clinical trials targeting SS treatment modalities. METHODS: A nested case-control study was designed within The National Institute of Dental and Craniofacial Research/National Institutes of Health (NIDCR/NIH) SS Cohort - one of the largest SS cohorts in the US...
September 9, 2016: EBioMedicine
https://www.readbyqxmd.com/read/27617291/atomic-scale-compositional-mapping-reveals-mg-rich-amorphous-calcium-phosphate-in-human-dental-enamel
#9
Alexandre La Fontaine, Alexander Zavgorodniy, Howgwei Liu, Rongkun Zheng, Michael Swain, Julie Cairney
Human dental enamel, the hardest tissue in the body, plays a vital role in protecting teeth from wear as a result of daily grinding and chewing as well as from chemical attack. It is well established that the mechanical strength and fatigue resistance of dental enamel are derived from its hierarchical structure, which consists of periodically arranged bundles of hydroxyapatite (HAP) nanowires. However, we do not yet have a full understanding of the in vivo HAP crystallization process that leads to this structure...
September 2016: Science Advances
https://www.readbyqxmd.com/read/27589397/importance-of-the-surface-roughness-and-residual-stress-of-dental-implants-on-fatigue-and-osseointegration-behavior-in-rabbits
#10
Eugenio Velasco, Loreto Monsalve-Guil, Alvaro Jimenez, Ivà N Ortiz, Jesà S Moreno-Muà Oz, Enrique Nuà Ez-Marquez, Marta Pegueroles, Roman A Perez, Francisco Javier Gil
This study focuses on the fatigue behavior and bone-implant attachment for the more usual surfaces of the different cp-titanium dental implants. The implants studied were: as-received (CTR), acid etching (AE), spark-anodization (SA) and with a grit-blasted surface (GB). Residual stresses were determined by means of X-ray diffraction. The fatigue tests were carried out at 37°C on 160 dental implants and the S-N curve was determined. The fatigue tests show that the grit-blasting process improves the fatigue life...
September 2, 2016: Journal of Oral Implantology
https://www.readbyqxmd.com/read/27548397/use-of-authentic-integrated-dental-implant-components-vital-to-predictability-and-successful-long-term-clinical-outcomes
#11
Steve Hurson
The accepted requirements for achieving long-term maintenance and performance of implant treatments include properly matched implant system components, a precise fit and connection between the abutment and implant, and appropriate preload. Satisfying these requisites can be predictably achieved when authentic and suitably compatible components that are engineered and marketed as an integrated implant system are placed. To the contrary, intermixing third-party or aftermarket implant components could result in unpredictable sequelae that negatively affect implant treatment outcomes...
July 2016: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/27548107/mechanical-reliability-evaluation-of-an-oral-implant-abutment-system-according-to-uni-en-iso-14801-fatigue-test-protocol
#12
Enrico Marchetti, Stefano Ratta, Stefano Mummolo, Simona Tecco, Raffaella Pecci, Rossella Bedini, Giuseppe Marzo
PURPOSE: The aim of this in vitro study was to evaluate the mechanical reliability of a dental implant system by testing its maximum fracture load and mechanical performance under cyclic fatigue stress. METHODS: An experimental study according to the international standards (UNI EN ISO 14801: 2008) was performed using 13 implants (3.80 mm in diameter and 12 mm in length) with straight titanium abutments tightened to 30 N. Five samples were subjected to compression stress at break...
October 2016: Implant Dentistry
https://www.readbyqxmd.com/read/27517052/long-term-fatigue-and-its-probability-of-failure-applied-to-dental-implants
#13
María Prados-Privado, Juan Carlos Prados-Frutos, Sérgio Alexandre Gehrke, Mariano Sánchez Siles, José Luis Calvo Guirado, José Antonio Bea
It is well known that dental implants have a high success rate but even so, there are a lot of factors that can cause dental implants failure. Fatigue is very sensitive to many variables involved in this phenomenon. This paper takes a close look at fatigue analysis and explains a new method to study fatigue from a probabilistic point of view, based on a cumulative damage model and probabilistic finite elements, with the goal of obtaining the expected life and the probability of failure. Two different dental implants were analysed...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27502895/fracture-resistance-of-dental-nickel-titanium-rotary-instruments-with-novel-surface-treatment-thin-film-metallic-glass-coating
#14
Chih-Wen Chi, Yu-Lun Deng, Jyh-Wei Lee, Chun-Pin Lin
BACKGROUND/PURPOSE: Dental nickel-titanium (NiTi) rotary instruments are widely used in endodontic therapy because they are efficient with a higher success rate. However, an unpredictable fracture of instruments may happen due to the surface characteristics of imperfection (or irregularity). This study assessed whether a novel surface treatment could increase fatigue fracture resistance of dental NiTi rotary instruments. METHODS: A 200- or 500-nm thick Ti-zirconium-boron (Ti-Zr-B) thin film metallic glass was deposited on ProTaper Universal F2 files using a physical vapor deposition process...
August 5, 2016: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/27456784/comparative-evaluation-of-cyclic-fatigue-resistance-of-four-different-nickel-titanium-rotary-files-with-different-cross-sectional-designs-and-alloy-properties
#15
Mehmet Emin Kaval, Ismail Davut Capar, Hüseyin Ertas, Bilge Hakan Sen
OBJECTIVE: The purpose of the present study was to evaluate the cyclic fatigue resistance of F6 SkyTaper (Komet Brasseler, Lemgo, Germany), K3XF (SybronEndo, Orange, CA, USA), new generation OneShape (Micro Mega, Besancon, France) and TRUShape 3D conforming files (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA). MATERIAL AND METHODS: Ten instruments from each group were selected and allowed to rotate using a low-torque motor in a stainless steel block with 1...
July 26, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27447147/removal-torque-and-biofilm-accumulation-at-two-dental-implant-abutment-joints-after-fatigue
#16
Jorge Pereira, Carolina S Morsch, Bruno Henriques, Rubens M Nascimento, Cesar Am Benfatti, Filipe S Silva, José López-López, Júlio Cm Souza
PURPOSE: The aim of this study was to evaluate the removal torque and in vitro biofilm penetration at Morse taper and hexagonal implant-abutment joints after fatigue tests. MATERIALS AND METHODS: Sixty dental implants were divided into two groups: (1) Morse taper and (2) external hexagon implant-abutment systems. Fatigue tests on the implant-abutment assemblies were performed at a normal force (FN) of 50 N at 1.2 Hz for 500,000 cycles in growth medium containing human saliva for 72 hours...
July 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27424270/descriptions-of-crack-growth-behaviors-in-glass-zro2-bilayers-under-thermal-residual-stresses
#17
Renan Belli, Michael Wendler, José I Zorzin, Anselm Petschelt, Carina B Tanaka, Josete Meira, Ulrich Lohbauer
OBJECTIVES: This study was intended to separate residual stresses arising from the mismatch in coefficients of thermal expansion between glass and zirconia (ZrO2) from those stresses arising solely from the cooling process. Slow crack growth experimentes were undertaken to demonstrate how cracks grow in different residual stress fields. METHODS: Aluminosilicate glass discs were sintered onto ZrO2 to form glass-ZrO2 bilayers. Glass discs were allowed to bond to the ZrO2 substrate during sintering or prevented from bonding by means of coating the ZrO2 with a thin boron nitrade coating...
September 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27375047/cyclic-fatigue-behavior-of-nickel-titanium-dental-rotary-files-in-clinical-simulated-root-canals
#18
Chih-Wen Chi, Chun-Chieh Li, Chun-Pin Lin, Chow-Shing Shin
BACKGROUND/PURPOSE: Dental rotary instruments can be applied in multiple conditions of canals, but unpredictable fatigue fracture may happen. This study evaluated the fatigue lives of two batches of nickel-titanium (NiTi) dental rotary files operating in clinically simulated root canals. METHODS: Single-step cyclic fatigue tests were carried out to assess the performance of two batches of NiTi files (ProTaper and ProFile) in nine combinations of simulated canals (cylinder radii 5 mm, 7...
June 30, 2016: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/27353062/fatigue-failure-of-dental-implants-in-simulated-intraoral-media
#19
K Shemtov-Yona, D Rittel
Metallic dental implants are exposed to various intraoral environments and repetitive loads during service. Relatively few studies have systematically addressed the potential influence of the environment on the mechanical integrity of the implants, which is therefore the subject of this study. Four media (groups) were selected for room temperature testing, namely dry air, saliva substitute, same with 250ppm of fluoride, and saline solution (0.9%). Monolithic Ti-6Al-4V implants were loaded until fracture, using random spectrum loading...
September 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27351078/influence-of-etching-mode-on-enamel-bond-durability-of-universal-adhesive-systems
#20
T Suzuki, T Takamizawa, W W Barkmeier, A Tsujimoto, H Endo, R L Erickson, M A Latta, M Miyazaki
The purpose of this study was to determine the enamel bond durability of three universal adhesives in different etching modes through fatigue testing. The three universal adhesives used were Scotchbond Universal, Prime&Bond Elect universal dental adhesive, and All-Bond Universal light-cured dental adhesive. A single-step self-etch adhesive, Clearfil S(3) Bond Plus was used as a control. The shear bond strength (SBS) and shear fatigue strength (SFS) to human enamel were evaluated in total-etch mode and self-etch mode...
June 28, 2016: Operative Dentistry
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