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Dental fatigue

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https://www.readbyqxmd.com/read/29773402/hydroxypropylmethyl-cellulose-hpmc-crosslinked-chitosan-ch-based-scaffolds-containing-bioactive-glass-bg-and-zinc-oxide-zno-for-alveolar-bone-repair
#1
Rabia Zeeshan, Zeeshan Mutahir, Haffsah Iqbal, Moazzam Ali, Farasat Iqbal, Kashif Ijaz, Faiza Sharif, Asma Tufail Shah, Aqif Anwar Chaudhry, Muhammad Yar, Shifang Luan, Ather Farooq Khan, Ihtesham-Ur-Rehman
The success of a dental implant relies on the presence of an optimal alveolar ridge. The aim of this study was to fabricate HPMC crosslinked chitosan based scaffolds for alveolar bone repair. Our results indicated that HPMC crosslinked CH/BG foams presented better morphological structure (132-90.5 μm) and mechanical responses (0.451 MPa with 100 mg BG) as confirmed by SEM analysis and fatigue testing respectively. Cytotoxicity analysis at day 2, 4 and 8 demonstrated that all composites were non-toxic and supported cellular viability...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29765904/cyclic-fatigue-resistance-torsional-resistance-and-metallurgical-characteristics-of-m3-rotary-and-m3-pro-gold-niti-files
#2
Eugenio Pedullà, Fabio Lo Savio, Giusy Rita Maria La Rosa, Gabriele Miccoli, Elena Bruno, Silvia Rapisarda, Seok Woo Chang, Ernesto Rapisarda, Guido La Rosa, Gianluca Gambarini, Luca Testarelli
Objectives: To evaluate the mechanical properties and metallurgical characteristics of the M3 Rotary and M3 Pro Gold files (United Dental). Materials and Methods: One hundred and sixty new M3 Rotary and M3 Pro Gold files (sizes 20/0.04 and 25/0.04) were used. Torque and angle of rotation at failure ( n = 20) were measured according to ISO 3630-1. Cyclic fatigue resistance was tested by measuring the number of cycles to failure in an artificial stainless steel canal (60° angle of curvature and a 5-mm radius)...
May 2018: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29715172/how-hedstrom-files-fail-during-clinical-use-a-retrieval-study-based-on-sem-optical-microscopy-and-micro-xct-analysis
#3
Spiros Zinelis, Youssef S Al Jabbari
This study was conducted to evaluate the failure mechanism of clinically failed Hedstrom (H)-files. Discarded H-files (n=160) from #8 to #40 ISO sizes were collected from different dental clinics. Retrieved files were classified according to their macroscopic appearance and they were investigated under scanning electron microscopy (SEM) and X-ray micro-computed tomography (mXCT). Then the files were embedded in resin along their longitudinal axis and after metallographic grinding and polishing, studied under an incident light microscope...
May 1, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29684777/random-spectrum-fatigue-performance-of-severely-plastically-deformed-titanium-for-implant-dentistry-applications
#4
D Rittel, K Shemtov-Yona, R Lapovok
Severe plastic deformation (SPD) has long been known to confer superior mechanical properties for many metals and alloys. In the general field of biomedical devices, and dental implants in particular, the superior strength of SPD-processed commercially pure (CP) titanium, that may surpass that of the stronger Ti6Al4V alloy, has been associated with a superior fatigue resistance. Such a property would make those materials both biocompatible and strong alternatives to the currently used titanium alloy. However, the fatigue characterization reported so far in the literature relies on a very small sample size, thereby precluding any meaningful statistical analysis...
April 14, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29678328/chairside-cad-cam-materials-part-3-cyclic-fatigue-parameters-and-lifetime-predictions
#5
Michael Wendler, Renan Belli, Diana Valladares, Anselm Petschelt, Ulrich Lohbauer
OBJECTIVES: Chemical and mechanical degradation play a key role on the lifetime of dental restorative materials. Therefore, prediction of their long-term performance in the oral environment should base on fatigue, rather than inert strength data, as commonly observed in the dental material's field. The objective of the present study was to provide mechanistic fatigue parameters of current dental CAD/CAM materials under cyclic biaxial flexure and assess their suitability in predicting clinical fracture behaviors...
April 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29627218/effect-of-chemical-surface-treatment-of-titanium-on-its-bond-with-dental-ceramics
#6
Monika Parchańska-Kowalik, Emilia Wołowiec-Korecka, Leszek Klimek
STATEMENT OF PROBLEM: Airborne-particle abrasion of titanium is a clinically accepted method of surface preparation. As a side effect of airborne-particle abrasion, particles of the abrasive material get embedded into the surface. How particle presence or removal from the titanium surface affects the strength of the titanium-ceramic bond is unclear. PURPOSE: The purpose of this in vitro study was to determine the effect of removing Al2 O3 particles embedded into the surface by means of chemical surface treatment on the strength of the titanium-ceramic bond...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29556556/an-epidemiological-study-on-the-prevalence-of-temporomandibular-disorder-and-associated-history-and-problems-in-nepalese-subjects
#7
Dinesh Rokaya, Kanokwan Suttagul, Shraddha Joshi, Bishwa Prakash Bhattarai, Pravin Kumar Shah, Shantanu Dixit
Background: Temporomandibular disorder (TMD) represents a subgroup of painful orofacial disorders involving pain in the temporomandibular joint (TMJ) region, fatigue of the cranio-cervico-facial muscles (especially masticatory muscles), limitation of mandible movement, and the presence of a clicking sound in the TMJ. TMD is associated with multiple factors and systemic diseases. This study aimed to assess the prevalence of TMD in Nepalese subjects for the first time. Methods: A total of 500 medical and dental students (127 men and 373 women) participated in this study from May 2016 to September 2016...
February 2018: Journal of Dental Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29482185/mercury-exposure-and-health-impacts-in-dental-personnel
#8
REVIEW
Jan Aaseth, Bjørn Hilt, Geir Bjørklund
Based on toxicological, clinical, and epidemiological knowledge, the present paper reviews the status regarding possible deleterious health effects from occupational exposure to metallic mercury (Hg) in dental practice. Symptoms from the central nervous system are among the health problems that most often are attributed to Hg exposure in dentists and dental nurses working with amalgam. Uncharacteristic symptoms of chronic low-level Hg vapor exposure including weakness, fatigue, and anorexia have been observed in numerous studies of dental personnel...
July 2018: Environmental Research
https://www.readbyqxmd.com/read/29416466/exacerbation-of-chronic-pain-after-dental-extractions-in-a-patient-with-post-treatment-lyme-disease-syndrome
#9
Stephanie Lim, Sakura Kinjo
A subset of patients who had Lyme disease experience postinfectious signs or symptoms called post-treatment Lyme disease syndrome (PTLDS). PTLDS is a chronic condition including pain in joints and muscles, neurological symptoms including demyelinating diseases, peripheral neuropathy, headaches, sleep disturbances, fatigue, and cardiac conditions. We report a case of difficult acute pain management in a patient with PTLDS who underwent dental extractions and required admission to an intensive care unit for pain control...
January 2018: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/29415490/on-the-potential-of-bulk-metallic-glasses-for-dental-implantology-case-study-on-ti-40-zr-10-cu-36-pd-14
#10
Alethea Liens, Aurélien Etiemble, Pascaline Rivory, Sandra Balvay, Jean-Marc Pelletier, Sandrine Cardinal, Damien Fabrègue, Hidemi Kato, Philippe Steyer, Tais Munhoz, Jerome Adrien, Nicolas Courtois, Daniel J Hartmann, Jérôme Chevalier
Ti40 Zr10 Cu36 Pd14 Bulk Metallic Glass (BMG) appears very attractive for future biomedical applications thanks to its high glass forming ability, the absence of toxic elements such as Ni, Al or Be and its good mechanical properties. For the first time, a complete and exhaustive characterization of a unique batch of this glassy alloy was performed, together with ISO standard mechanical tests on machined implant-abutment assemblies. The results were compared to the benchmark Ti-6Al-4V ELI (Extra-Low-Interstitial) to assess its potential in dental implantology...
February 6, 2018: Materials
https://www.readbyqxmd.com/read/29402538/approximate-relative-fatigue-life-estimation-methods-for-thin-walled-monolithic-ceramic-crowns
#11
Sadia Nasrin, Noriko Katsube, Robert R Seghi, Stanislav I Rokhlin
OBJECTIVES: The objective is to establish an approximate relative fatigue life estimation method under simulated mastication load for thin-walled monolithic restorations. METHODS: Experimentally measured fatigue parameters of fluormica, leucite, lithium disilicate and yttrium-stabilized zirconia in the existing literature were expressed in terms of the maximum cyclic stress and stress corresponding to initial crack size prior to N number of loading cycles to assess their differences...
May 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29399950/a-literature-review-on-the-new-polymer-infiltrated-ceramic-network-material-picn
#12
REVIEW
Júlia Cadorim Facenda, Marcia Borba, Pedro Henrique Corazza
OBJECTIVES: Ceramics and composites are the most used materials for dental application. Recently, the characteristics of both were combined on the called "polymer-infiltrated ceramic-network" (PICN). The aim of this review is to report the behavior of PICN, comparing the findings that may support the correct clinical application. OVERVIEW: The PICN material is a structure with a sintered ceramic matrix infiltrated with a polymer matrix. Studies evaluated this material microstructure and composition, mechanical properties and adhesive behavior...
February 5, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29398091/correlation-between-temperature-dependent-fatigue-resistance-and-differential-scanning-calorimetry-analysis-for-2-contemporary-rotary-instruments
#13
Ana Arias, José C Macorra, Sanjay Govindjee, Ove A Peters
INTRODUCTION: The aim of this study was to assess differences in cyclic fatigue (CF) life of contemporary heat-treated nickel-titanium rotary instruments at room and body temperatures and to document corresponding phase transformations. METHODS: Forty Hyflex EDM (H-EDM) files (Coltene, Cuyahoga Falls, OH [#25/.08, manufactured by electrical discharge machining]) and 40 TRUShape (TS) files (Dentsply Tulsa Dental Specialties, Tulsa, OK [#25/.06v, manufactured by grinding and shape setting]) were divided into 2 groups (n = 20) for CF resistance tests in a water bath either at room (22°C ± 0...
April 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29364010/the-patient-concerns-inventory-integrated-as-part-of-routine-head-and-neck-cancer-follow-up-consultations-frequency-case-mix-and-items-initiated-by-the-patient
#14
S N Rogers, F Thomson, D Lowe
Introduction The National Institute for Health and Care Excellence guidance Improving Supportive and Palliative Care for Adults with Cancer (2004) and the Cancer Reform Strategy (2007) support the premise that assessment and discussion of patients' needs for physical, social, psychological, and spiritual wellbeing should be undertaken during oncology follow-up. We report the use of the Patient Concerns Inventory in a routine head and neck cancer clinic setting over a seven-year period, summarising the number of available clinics, the number of patients completing the inventory within a clinic, the range of clinical characteristics and the concerns they wanted to discuss...
March 2018: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/29351113/fatigue-failure-of-external-hexagon-connections-on-cemented-implant-supported-crowns
#15
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
#16
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
#17
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/...
April 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
#18
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
#19
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
#20
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
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