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Dental fatigue

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
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...
February 23, 2018: Environmental Research
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
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
Ti40Zr10Cu36Pd14 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
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...
February 2, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
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
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...
February 2, 2018: Journal of Endodontics
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...
January 24, 2018: Annals of the Royal College of Surgeons of England
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
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
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
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
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
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
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
Murilo Priori Alcalde, Marco Antonio Hungaro Duarte, Clovis Monteiro Bramante, Bruno Carvalho de Vasconselos, Mario Tanomaru-Filho, Juliane Maria Guerreiro-Tanomaru, Jader Camilo 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
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 silica-coated 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...
2017: Journal of Adhesive Dentistry
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
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
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
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