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Dental fatigue

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https://www.readbyqxmd.com/read/29351113/fatigue-failure-of-external-hexagon-connections-on-cemented-implant-supported-crowns
#1
João Malta Barbosa, Daniel Navarro da Rocha, Ronaldo Hirata, Gileade Freitas, Estevam A Bonfante, Paulo G Coelho
PURPOSE: To evaluate the probability of survival and failure modes of different external hexagon connection systems restored with anterior cement-retained single-unit crowns. The postulated null hypothesis was that there would be no differences under accelerated life testing. MATERIALS AND METHODS: Fifty-four external hexagon dental implants (∼4 mm diameter) were used for single cement-retained crown replacement and divided into 3 groups: (3i) Full OSSEOTITE, Biomet 3i (n = 18); (OL) OEX P4, Osseolife Implants (n = 18); and (IL) Unihex, Intra-Lock International (n = 18)...
January 17, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29320883/the-prevalence-of-oral-stage-dysphagia-in-adults-presenting-with-temporomandibular-disorders-a-systematic-review-and-meta-analysis
#2
Órla Gilheaney, Sibylle Béchet, Patrick Kerr, Ciaran Kenny, Shauna Smith, Rita Kouider, Rachel Kidd, Margaret Walshe
OBJECTIVE: Temporomandibular disorders (TMDs) are the most commonly experienced non-dental orofacial pain disorders, with pain and dysfunction potentially resulting in oral stage dysphagia (OD). However, limited research has been conducted on this condition, with potential negative effects on clinical practice. Therefore, the aim of this study was to determine the prevalence of OD in adults presenting with TMDs, diagnosed as per the Research Diagnostic Criteria for Temporomandibular Disorders or the Diagnostic Criteria for Temporomandibular Disorders protocols...
January 11, 2018: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/29306534/low-environmental-temperature-influences-the-fatigue-resistance-of-nickel-titanium-files
#3
Ya Shen, Xiangya Huang, Zhejun Wang, Xi Wei, Markus Haapasalo
INTRODUCTION: The purpose of this study was to evaluate the effect of different temperatures (0°C, 10°C, 22°C, 37°C, and 60°C) on the cyclic fatigue life of nickel-titanium (NiTi) files using a new fatigue test model in zirconium oxide. METHODS: Three superelastic NiTi files (EndoSequence [Brasseler USA, Savannah, GA], ProFile [Dentsply Tulsa Dental Specialties, Tulsa, OK], and K3 [SybronEndo, Orange, CA]), and 3 heat-treated (K3XF [SybronEndo], Vortex [Dentsply Tulsa Dental Specialties], and HyFlex CM [Coltene-Whaledent, Allstetten, Switzerland]) NiTi files, all size 25/...
January 3, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29302289/preload-loss-of-abutment-screws-after-dynamic-fatigue-in-single-implant-supported-restorations-a-systematic-review
#4
REVIEW
Beatriz Pardal-Peláez, Javier Montero
Background: To carry out a systematic literature review of the causes of preload loss of the abutment screws, of internal and external connection implants, tightened to different torque values and subjected to cyclic loading. Material and Methods: A systematic search was conducted in PubMed, EMBASE, and Cochrane Library databases with reference to in vitro studies in which internal and external connection implants were subjected to cyclic loads to determine the degree of loosening of the abutment screws after loading...
November 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29299189/in-vitro-resistance-to-fracture-of-two-nickel-titanium-rotary-instruments-made-with-different-thermal-treatments
#5
Gabriele Miccoli, Gianfranco Gaimari, Marco Seracchiani, Antonio Morese, Tatyana Khrenova, Dario Di Nardo
Aim: Aim of the study was to evaluate effectiveness of different heat treatments in improving Ni-Ti endodontic rotary instruments' resistance to fracture. Methods: 24 new NiTi instruments similar in length and shape: 12 M3 instruments, tip size 25 and .06 taper (United Dental, Shanghai, China), and 12 M3 Pro Gold instruments tip size 25 and .06 taper (United Dental, Shanghai, China), were tested in a 60° curved artificial root canal. Each group received a different heat treatment...
April 2017: Annali di Stomatologia
https://www.readbyqxmd.com/read/29284956/effect-of-surface-modifications-on-the-retention-of-cement-retained-implant-crowns-under-fatigue-loads-an-in-vitro-study
#6
R Ajay, K Suma, Seyed Asharaf Ali, Jambai Sampath Kumar Sivakumar, V Rakshagan, V Devaki, K Divya
Background: Masticatory forces cause fatigue to the dental luting agents, adversely affecting the retention of these cement-retained crowns. Sandblasting (SB) and diamond abrading the abutment surface improves the bond strength of luting agents. However, the effect of acid etching (AE) on the implant abutment surface and the effect of other surface modifications under masticatory load are yet to be documented. Purpose: The aim of the study was to evaluate the effect of abutment surface modifications on the retention of cement-retained restorations subjected to cyclic fatigue loads...
November 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/29258696/residual-stress-of-porcelain-fused-to-zirconia-3-unit-fixed-dental-prostheses-measured-by-nanoindentation
#7
Vinicius P Fardin, Estevam A Bonfante, Paulo G Coelho, Malvin N Janal, Nick Tovar, Lukasz Witek, Dimorvan Bordin, Gerson Bonfante
OBJECTIVE: To evaluate the residual stress (nanoindentation based on hardness) of fatigued porcelain-fused to zirconia 3-unit fixed dental prostheses (FDP) with different framework designs. METHODS: Twenty maxillary 3-unit FDP replacing second-premolar (pontic) were fabricated with conventional framework-design (even-thickness of 0.5mm and 9mm2 connector area) and modified framework-design (thickness of 0.5mm presenting lingual collar connected to proximal struts and 12mm2 connector area)...
December 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29224061/cyclic-fatigue-and-torsional-strength-of-three-different-thermally-treated-reciprocating-nickel-titanium-instruments
#8
Murilo Priori Alcalde, Marco Antonio Hungaro Duarte, Clovis Monteiro Bramante, Bruno Carvalho de Vasconselos, Mario Tanomaru-Filho, Juliane Maria Guerreiro-Tanomaru, Jader Carvalho Pinto, Marcus Vinicius Reis Só, Rodrigo Ricci Vivan
OBJECTIVES: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of the reciprocating single-file systems Reciproc Blue 25.08 (VDW GmbH, Munich, Germany), Prodesign R 25.06 (Easy Dental Equipment, Belo Horizonte, Brazil), and WaveOne Gold 25.07 (Dentsply/Tulsa Dental Specialties, Tulsa, OK, USA). MATERIALS AND METHODS: Sixty reciprocating instruments of the systems Reciproc Blue R25 (RB #25 .08 taper), Prodesign R (PDR #25 .06 taper), and WaveOne Gold (WOG #25 ...
December 9, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29152618/effect-of-mechanical-fatigue-on-the-bond-between-zirconia-and-composite-cement
#9
Hugo A Vidotti, Ricardo M Carvalho, Paulo G Coelho, Willian F Zambuzzi, Gerson Bonfante, Accácio L do Valle, Estevam A Bonfante
PURPOSE: To examine the effect of mechanical fatigue on the bond strength of resin composite cemented to silicacoated yttria-tetragonal zirconia polycrystal ceramic (Y-TZP). MATERIALS AND METHODS: Ten Y-TZP blocks were polished down to 600-grit silicon carbide paper. Specimens were silica coated by airborne-particle abrasion with 30-μm silica-modified Al2O3 particles. Blocks were cleaned in an ultrasonic bath, and a dental adhesive was applied and light cured for 20 s...
November 17, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29128693/effect-of-adding-support-structures-for-overhanging-part-on-fatigue-strength-in-selective-laser-melting
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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