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Dental fatigue

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https://www.readbyqxmd.com/read/29128693/effect-of-adding-support-structures-for-overhanging-part-on-fatigue-strength-in-selective-laser-melting
#1
Yuka Kajima, Atsushi Takaichi, Takayuki Nakamoto, Takahiro Kimura, Nuttaphon Kittikundecha, Yusuke Tsutsumi, Naoyuki Nomura, Akira Kawasaki, Hidekazu Takahashi, Takao Hanawa, Noriyuki Wakabayashi
Selective laser melting (SLM) technology was recently introduced to fabricate dental prostheses. However, the fatigue strength of clasps in removable partial dentures prepared by SLM still requires improvement. In this study, we attempted to improve the fatigue strength of clasps by adding support structures for overhanging parts, which can generally be manufactured at an angle to be self-supporting. The results show that the fatigue strength of the supported specimens was more than twice that of unsupported specimens...
November 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29119096/severe-skeletal-class-ii-division-1-malocclusion-in-postpubertal-girl-treated-using-forsus-with-miniplate-anchorage
#2
Harshal Ashok Patil, Veerendra V Kerudi, B M Rudagi, Jitendra S Sharan, Pawankumar Dnyandeo Tekale
This case report outlines the treatment of a 17-year-old female with Class II Division 1 malocclusion with mandibular retrusion, deep bite, and convex facial profile. The Forsus fatigue resistance device with miniplate was used for this patient and it was very affecting tool in correcting both skeletal and dental parameters. The total active treatment time was 19 months. This method can serve as an alternate choice of treatment, especially those who refuse orthognathic surgery. Hence, Forsus with miniplate might be useful in both growing and postpubertal patients...
October 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/29118255/the-effect-of-stainless-steel-and-silicone-instruments-on-hand-comfort-and-strength-a-pilot-study
#3
Melanie J Hayes
Purpose: Many dental hygienists experience musculoskeletal pain during the course of their careers, often as a result of the sustained grips on instruments and repetitive movements employed during clinical practice. Current research suggests that lighter instruments with a larger diameter reduce force and load on the hand during scaling procedures; therefore, the texture and weight of silicone handles is designed to decrease the strain placed on the hand and fingers. The purpose of this research is to investigate and compare the effect of silicone instrument handles and traditional stainless steel instrument handles on hand comfort and strength...
April 2017: Journal of Dental Hygiene: JDH
https://www.readbyqxmd.com/read/29097830/speed-sintering-translucent-zirconia-for-chairside-one-visit-dental-restorations-optical-mechanical-and-wear-characteristics
#4
Marina R Kaizer, Petra C Gierthmuehlen, Mateus Bf Dos Santos, Sergio S Cava, Yu Zhang
The fabrication of zirconia dental restorations is a time-consuming process due to traditional slow sintering schemes; zirconia (Y-TZP) produced by these conventional routes are predominantly opaque. Novel speed sintering protocols have been developed to meet the demand for time and cost effective chairside CAD/CAM-produced restorations, as well as to control ceramic microstructures for better translucency. Although the speed sintering protocols have already been used to densify dental Y-TZP, the wear properties of these restorations remain elusive...
October 1, 2017: Ceramics International
https://www.readbyqxmd.com/read/29079058/cyclic-and-torsional-fatigue-resistance-of-xp-endo-shaper-and-trushape-instruments
#5
Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Felipe Gonçalves Belladonna, Arthur de Siqueira Zuolo, Henrique Dos Santos Antunes, Daniele Moreira Cavalcante, Carlos Nelson Elias, Gustavo De-Deus
INTRODUCTION: The purpose of this study was to evaluate the cyclic and torsional fatigue resistance of the XP-endo Shaper (FKG Dentaire, La Chaux-de-Fonds, Switzerland) and TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) instruments. METHODS: Twenty XP-endo Shaper (30/0.01) instruments and 20 TRUShape (30/0.06v) instruments were used. Cyclic fatigue resistance was tested by measuring the number of cycles and time to fracture in an artificial stainless steel canal with a 60° angle and a 5-mm radius of curvature (n = 10)...
October 24, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/29060278/a-study-on-setting-of-the-fatigue-limit-of-temporary-dental-implants
#6
M H Kim, E J Cho, J W Lee, E K Kim, S H Yoo, C W Park
A temporary dental implant is a medical device which is temporarily used to support a prosthesis such as an artificial tooth used for restoring patient's masticatory function during implant treatment. It is implanted in the oral cavity to substitute for the role of tooth. Due to the aging and westernization of current Korean society, the number of tooth extraction and implantation procedures is increasing, leading to an increase in the use and development of temporary dental implants. Because an implant performs a masticatory function in place of a tooth, a dynamic load is repeatedly put on the implant...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29030714/cyclic-fatigue-resistance-of-xp-endo-shaper-compared-with-different-nickel-titanium-alloy-instruments
#7
Amr Elnaghy, Shaymaa Elsaka
OBJECTIVE: The aims of this study were to assess and compare the resistance to cyclic fatigue of XP-endo Shaper (XPS; FKG Dentaire, La Chaux-de-Fonds, Switzerland) instruments with TRUShape (TRS; Dentsply Tulsa Dental Specialties, Tulsa, OK, USA), HyFlex CM (HCM; Coltene, Cuyahoga Falls, OH, USA), Vortex Blue (VB; Dentsply Tulsa Dental Specialties), and iRace (iR; FKG Dentaire) nickel-titanium rotary instruments at body temperature. MATERIALS AND METHODS: Size 30, 0...
October 13, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29017761/adm-guidance-ceramics-fatigue-principles-and-testing
#8
REVIEW
J R Kelly, P F Cesar, S S Scherrer, A Della Bona, R van Noort, M Tholey, A Vichi, U Lohbauer
BACKGROUND: Clinical failure of dental ceramics is usually reported as partial fracture of the restoration (chipping) or as catastrophic fracture of the whole structure. In contrast to metals, ceramics are linear-elastic, brittle materials exhibiting extremely low damage tolerance to failure. Well documented clinical and lab reports have shown this fracture event often occurs at loads far below their fracture strength due to intrinsic fatigue degradation via slow crack growth or cyclic fatigue mechanisms...
November 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28954940/influence-of-the-number-of-cycles-on-shear-fatigue-strength-of-resin-composite-bonded-to-enamel-and-dentin-using-dental-adhesives-in-self-etching-mode
#9
Akimasa Tsujimoto, Wayne W Barkmeier, Robert L Erickson, Toshiki Takamizawa, Mark A Latta, Masashi Miyazaki
The influence of the number of cycles on shear fatigue strength to enamel and dentin using dental adhesives in self-etch mode was investigated. A two-step self-etch adhesive and two universal adhesives were used to bond to enamel and dentin in self-etch mode. Initial shear bond strength and shear fatigue strength to enamel and dentin using the adhesive in self-etch mode were determined. Fatigue testing was used with 20 Hz frequency and cycling periods of 50,000, 100,000 and 1,000,000 cycles, or until failure occurred...
September 28, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28951027/fatigue-resistance-of-nickel-titanium-instruments-exposed-to-high-concentration-hypochlorite
#10
Xiangya Huang, Ya Shen, Xi Wei, Markus Haapasalo
INTRODUCTION: The purpose of this study was to introduce a new fatigue test model that simulates the clinical situation for evaluating the corrosion effect of 5.25% sodium hypochlorite (NaOCl) on nickel-titanium (NiTi) files and to evaluate the effect of 3 different temperatures (22°C, 37°C, and 60°C) on the cyclic fatigue of these files. METHODS: Three NiTi files (size 25/.04), K3 (SybronEndo, Orange, CA), K3XF (SybronEndo), and Vortex (Dentsply Tulsa Dental Specialties, Tulsa, OK), were subjected to cyclic fatigue tests inside a novel artificial ceramic canal with a curvature of 60° and a 5-mm radius...
November 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28947040/comparison-of-titrable-thermoplastic-versus-custom-made-mandibular-advancement-device-for-the-treatment-of-obstructive-sleep-apnoea
#11
Frédéric Gagnadoux, Xuan-Lan Nguyen, Marc Le Vaillant, Pascaline Priou, Nicole Meslier, Audrey Eberlein, Jean-Daniel Kun-Darbois, Cyril Chaufton, Bruno Villiers, Maguy Levy, Wojciech Trzépizur, Sandrine Launois
BACKGOUND AND OBJECTIVES: The disadvantages of custom-made mandibular advancement devices (MAD) for obstructive sleep apnoea (OSA) therapy are the cost and delay required to manufacture the device. This study aimed to evaluate the efficacy of a titrable, thermoplastic MAD compared to a custom-made MAD for OSA therapy. METHODS: In this prospective nonrandomized study, 158 patients with OSA from two French sleep centers were treated for 6 months with a titrable thermoplastic MAD (n = 86) or a custom-made MAD (n = 72)...
October 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28886950/influence-of-thermo-mechanical-cycling-on-porcelain-bonding-to-cobalt-chromium-and-titanium-dental-alloys-fabricated-by-casting-milling-and-selective-laser-melting
#12
Maja Antanasova, Andraž Kocjan, Janez Kovač, Borut Žužek, Peter Jevnikar
PURPOSE: The aim has been to determine the effect of thermo-mechanical cycling on shear-bond-strength (SBS) of dental porcelain to Co-Cr and Ti-based alloys fabricated by casting, computer-numerical-controlled milling, and selective-laser-melting (SLM). METHODS: Seven groups (n=22/group) of metal cylinders were fabricated by casting (Co-Cr and commercially pure-cpTi), milling (Co-Cr, cpTi, Ti-6Al-4V) or by SLM (Co-Cr and Ti-6Al-4V) and abraded with airborne-particles...
September 5, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28886762/the-tooth-its-structure-and-properties
#13
REVIEW
Dwayne D Arola, Shanshan Gao, Hai Zhang, Radi Masri
This article provides a brief review of recent investigations concerning the structure and properties of the tooth. The last decade has brought a greater emphasis on the durability of the tooth, an improved understanding of the fatigue and fracture behavior of the principal tissues, and their importance to tooth failures. The primary contributions to tooth durability are discussed, including the process of placing a restoration, the impact of aging, and challenges posed by the oral environment. The significance of these findings to the dental community and their importance to the pursuit of lifelong oral health are highlighted...
October 2017: Dental Clinics of North America
https://www.readbyqxmd.com/read/28885034/treatment-outcomes-of-class-ii-malocclusion-cases-treated-with-miniscrew-anchored-forsus-fatigue-resistant-device-a-randomized-controlled-trial
#14
Osama Eissa, Mahmoud El-Shennawy, Safaa Gaballah, Ghada El-Meehy, Tarek El Bialy
OBJECTIVE: To evaluate the skeletal, dental, and soft tissue effects of the Forsus Fatigue Resistant Device (FRD) used with miniscrew anchorage and compare them with those of the conventional Forsus FRD. MATERIALS AND METHODS: This study was carried out on 38 patients. These patients were randomly allocated into three groups. The 14 patients in group 1 (aged 12.76 ± 1.0 years) were treated with the FRD appliance. In group 2, the 15 patients (aged 12.52 ± 1.12 years) received treatment with FRD using miniscrew anchorage, and the 9 patients in group 3 (aged 12...
September 8, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28867661/influence-of-specimens-geometry-and-materials-on-the-thermal-stresses-in-dental-restorative-materials-during-thermal-cycling
#15
Douglas Fabris, Júlio C M Souza, Filipe S Silva, Márcio Fredel, Michael Gasik, Bruno Henriques
OBJECTIVES: Thermal cycling is widely used to simulate the aging of restorative materials corresponding to the changes of temperature in the oral cavity. However, test parameters present in literature vary considerably, which prevents comparison between different reports. The aim of this work is to assess the influence of the specimens' geometry and materials on the thermal stresses developed during thermal cycling tests. MATERIALS AND METHODS: Finite elements method was used to simulate the conditions of thermal cycling tests for three different sample geometries: a three-points bending test sample, a cylinder rod and more complex shape of a restoration crown...
August 31, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28846561/incidence-and-management-of-fractured-dental-implants-case-reports
#16
Soo-Young Jin, Su-Gwan Kim, Ji-Su Oh, Jae-Seek You, Mi-Ae Jeong
The fracture of dental implants is a rare occurrence in clinical settings. Possible causes of implant fracture include design or production flaws, overloaded occlusion force, implant location, metal fatigue, and bone resorption around the implant. This study reports on the successful removal and reimplantation of fractured implants.
October 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28843960/interfacial-degradation-of-adhesive-composite-restorations-mediated-by-oral-biofilms-and-mechanical-challenge-in-an-extracted-tooth-model-of-secondary-caries
#17
Carola A Carrera, Yuping Li, Ruoquiong Chen, Conrado Aparicio, Alex Fok, Joel Rudney
OBJECTIVE: To study the combined effect of simulated occlusal loading and plaque-derived biofilm on the interfacial integrity of dental composite restorations, and to explore whether the effects are modulated by the incorporation of sucrose. METHODS: MOD-class-II restorations were prepared in third molars. Half of the specimens (n=27) were subjected to 200,000 cycles of mechanical loading using an artificial oral environment (ART). Then, both groups of specimens (fatigued and non-fatigued) were divided into three subgroups for testing in CDC-reactors under the following conditions: no biofilm (Control), biofilm with no sucrose (BNS) and biofilm pulsed with sucrose (BWS)...
November 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28771952/prevalence-and-determinants-of-frailty-and-associated-comorbidities-among-older-gurkha-welfare-pensioners-in-nepal
#18
Sirjana Devkota, Bruce Anderson, Roy L Soiza, Phyo K Myint
AIM: Population aging is increasing in low-income countries. Despite this, there is distinct lack of knowledge about the prevalence of comorbidities and determinants of frailty among older people in these countries. METHODS: We examined data from "Health and Social Care Needs Assessment Survey of the Gurkha Welfare Pensioners" carried out in 2014. Participants were aged ≥60 years from the Gorakha, Lamjung and Tanahu districts of Nepal. Face-to-face interviews were carried out using validated questionnaires...
August 2, 2017: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/28757795/a-new-model-to-study-fatigue-in-dental-implants-based-on-probabilistic-finite-elements-and-cumulative-damage-model
#19
María Prados-Privado, José Antonio Bea, Rosa Rojo, Sérgio A Gehrke, José Luis Calvo-Guirado, Juan Carlos Prados-Frutos
The aim of this study was to predict the fatigue life of two different connections of a dental implant as in load transfer to bone. Two three-dimensional models were created and assembled. All models were subjected to a natural masticatory force of 118 N in the angle of 75° to the occlusal plane. All degrees of freedom in the inferior border of the cortical bone were restrained, and the mesial and distal borders of the end of the bone section were constrained. Fatigue material data and loads were assumed as random variables...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28720340/mechanical-strength-and-fracture-point-of-a-dental-implant-under-certification-conditions-a-numerical-approach-by-finite-element-analysis
#20
Guillermo de la Rosa Castolo, Sonia V Guevara Perez, Pierre-Jean Arnoux, Laurent Badih, Franck Bonnet, Michel Behr
STATEMENT OF PROBLEM: Implant prosthodontics provides high-quality outcomes thanks to recent technological developments and certification procedures such as International Organization for Standardization (ISO) standard 14801. However, these certification tests are costly, and the result is highly uncertain as the influence of design variables (materials and structure) is still unknown. The design process could be significantly improved if the influence of design parameters were identified...
July 15, 2017: Journal of Prosthetic Dentistry
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