Journal articles: 'Fatigue Resistant Device'

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Elkordy, Sherif A., Mona M. Salah Fayed, Khaled H. Attia, and Amr M. Abouelezz. "Complications encountered during Forsus Fatigue Resistant Device therapy." Dental Press Journal of Orthodontics 25, no. 3 (2020): 65–72. http://dx.doi.org/10.1590/2177-6709.25.3.065-072.oar.

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ABSTRACT Introduction: Fixed functional appliances are non-compliant solutions to Class II malocclusion treatment. The clinician, however, should be careful of unexpected complications during the therapy. Methods: 58 female adolescents who presented with Class II malocclusion due to deficient mandible were treated with Forsus Fatigue Resistant Device (FFRD) therapy until an overcorrection to an edge to edge incisor relationship was achieved. Results: Incisor relationship and overjet were corrected successfully in all the subjects. Twenty-two patients had a complications-free treatment, while several complications were encountered with the remaining 36 subjects. In particular, mandibular canine rotation and development of posterior crossbites were the most common complications, with percentages of 51.7% and 25.9% respectively. Other complications included the breakage and shearing of the extraoral tubes of the first molar bands, and excessive intrusion of the upper first molars. Conclusions: FFRD is an efficient appliance for treatment of Class II malocclusion; however, different complications were encountered during the appliance therapy. A focus on taking precautions and applying preventive measures can help to avoid such problems, reducing the number of emergency appointments and enhancing the treatment experience with the appliance.

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Bowman, Amy C., Humam Saltaji, Carlos Flores-Mir, Brian Preston, and Sawsan Tabbaa. "Patient experiences with the Forsus Fatigue Resistant Device." Angle Orthodontist 83, no. 3 (2012): 437–46. http://dx.doi.org/10.2319/081112-647.1.

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ABSTRACT Objective: To investigate patients' experiences with the Forsus Fatigue Resistant Device (FFRD). Methods: This was a survey focused on patient's comprehensive experience with FFRD, both initially and after several months of wear, including the patient's overall impression of the appliance. The survey was administered to 70 patients wearing FFRD in both university and private practice settings. Results: A high percentage (81.5%) reported a neutral to favorable experience with FFRD; 89.8% reported growing accustomed to the appliance within 4 weeks. The majority of those who had previously worn rubber bands found FFRD to be “easier.” Cheek irritation was the most serious side effect (about 50%). Cheek irritation and other negative effects generally decreased over time. Conclusions: The FFRD is relatively well accepted by patients. Most patients experience some discomfort and functional limitations; however, the effect generally diminishes with time, and patients adapt to the appliance. Practitioners should be especially vigilant about problems with cheek irritation.

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Aslan, Belma I., Ebru Kucukkaraca, Cagri Turkoz, and Mufide Dincer. "Treatment effects of the Forsus Fatigue Resistant Device used with miniscrew anchorage." Angle Orthodontist 84, no. 1 (2013): 76–87. http://dx.doi.org/10.2319/032613-240.1.

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ABSTRACT Objective: To evaluate the dentofacial effects of the Forsus Fatigue Resistant Device (FRD) used with miniscrew anchorage (FRDMS) and compare them with those of conventional FRD and an untreated Class II control group. Materials and Methods: The sample consisted of 48 Class II subjects. Sixteen patients (13.68 ± 1.09 years of age) were treated with FRDMS, whereas 17 subjects (14.64 ± 1.56 years of age) were treated with only FRD. Also, a control sample of 15 untreated Class II subjects (14.13 ± 1.50 years of age) was constructed. Angular and linear measurements were made on 96 lateral cephalograms. Paired t, one-way analysis of variance, and Tukey tests were used for statistical analysis. Results: Class I molar relationship and overjet correction were achieved in an average period of 6.5 ± 1.97 and 5.5 ± 1.80 months in the FRDMS and FRD groups, respectively. No skeletal effect was determined in both treatment groups. Greater overbite correction was found in the FRD group. Retrusion and extrusion of maxillary incisors, distalization of maxillary molars, and extrusion of mandibular molars were significant in both treatment groups. Labial tipping of mandibular incisors was significantly greater in the FRD group than in the FRDMS group. Conclusion: Overjet and molar correction was totally dentoalveolar. Unfavorable labial tipping of mandibular incisors was effectively minimized with the usage of miniscrews.

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Jonnalagadda, VenkataNaga Sravanthi, and SB V. Ramana Reddy. "Treatment of Class II division 1 malocclusion using forsus fatigue-resistant device." International Journal of Orthodontic Rehabilitation 9, no. 4 (2018): 168. http://dx.doi.org/10.4103/ijor.ijor_19_18.

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Sood, S., Om Kharbanda, R. Duggal, M. Sood, and S. Gulati. "Muscle Response during Treatment of Class II Division 1 Malocclusion with Forsus Fatigue Resistant Device." Journal of Clinical Pediatric Dentistry 35, no. 3 (2011): 331–38. http://dx.doi.org/10.17796/jcpd.35.3.5v86511u4h1mw144.

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Purpose: To evaluate the muscle response in order to determine the mechanism of neuromuscular adaptations with Forsus Fatigue Resistant DeviceTM which has greater elasticity and flexibility; allows greater range of movement of mandible; is available in pre fabricated assembly of springs, tubes and rods and is a simple, effective and reliable corrective appliance that benefits not only growing patients but also malocclusions that previously required extractions, headgears and surgery. Method: Bilateral EMG activity from anterior temporalis and masseter muscles was monitored longitudinally on 10 young growing females with Class II Division 1 malocclusion to determine changes in postural, swallowing, and maximal voluntary clenching over an observation period of 6 months. Results: There was a significant decrease in the muscle activity at one month after Forsus Fatigue Resistant DeviceTM insertion during swallowing of saliva and maximal voluntary clenching which gradually returned to pre treatment levels at the end of six months.Conclusion: This study suggests that Forsus Fatigue Resistant DeviceTM should be given for at least six months to allow for adequate neuromuscular adaptations to occur for long term stability of the result.

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Aras, Isil, and Aylin Pasaoglu. "Class II subdivision treatment with the Forsus Fatigue Resistant Device vs intermaxillary elastics." Angle Orthodontist 87, no. 3 (2016): 371–76. http://dx.doi.org/10.2319/070216-518.1.

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ABSTRACT Objective: To compare the effectiveness of comprehensive fixed appliance treatments implemented in combination with Forsus or intermaxillary elastics in Class II subdivision subjects. Materials and Methods: Twenty-eight Class II subdivision patients were allocated to two groups using matched randomization: Forsus group (mean age, 14.19 ± 1.02 years) and elastics group (mean age, 13.75 ± 1.16 years). Patients received fixed appliance therapy in combination with either Forsus or intermaxillary elastics. The study was conducted on lateral cephalograms and digital models acquired before orthodontic treatment and 10–12 weeks after the fixed appliances were removed. Results: The treatment phase comprising the use of Forsus (4.53 ± 0.91 months) was significantly shorter compared with elastics application (6.85 ± 1.08 months). This was also true for comparing duration of overall comprehensive treatment in both groups. Extrusion and palatal tipping of maxillary incisors and clockwise rotation of the occlusal plane were greater in the elastics group (P &lt; .05). The mandibular incisors were proclined in both groups (P &lt; .001), but no significant difference was observed between groups (P &gt; .05). The mandibular incisors showed intrusion in the Forsus group and extrusion in the elastics group; the difference between groups was significant (P &lt; .05). Overbite was decreased in both groups (P &lt; .001) in similar amounts. Improvement in overjet, mandibular midline deviation, and correction of molar relationship on the Class II side were greater in the Forsus group (P &lt; .05). Conclusion: Forsus is more effective for correcting Class II subdivision malocclusion in a shorter treatment period with minimal patient compliance required.

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Li, Hegang, Xun Ren, Yun Hu, and Lijun Tan. "Effects of the Forsus Fatigue-resistant Device on Skeletal Class II Malocclusion Correction." Journal of Contemporary Dental Practice 21, no. 1 (2020): 105–12. http://dx.doi.org/10.5005/jp-journals-10024-2748.

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Testarelli, L., N. M. Grande, G. Plotino, et al. "Cyclic Fatigue of Different Nickel-Titanium Rotary Instruments: A Comparative Study." Open Dentistry Journal 3, no. 1 (2009): 55–58. http://dx.doi.org/10.2174/1874210600903010055.

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Since the introduction of nickel-titanium alloy to endodontics, there have been many changes in instrument design, but no significant improvements in the raw material properties, or enhancements in the manufacturing process. Recently, a new method to produce nickel-titanium rotary (NTR) instruments has been developed, in an attempt to obtain instruments that are more flexible and resistant to fatigue. NTR instruments produced using the process of twisting (TF, SybronEndo, Orange, CA) were compared to NTR instruments from different manufacturers produced by a traditional grinding process. The aim of the study was to investigate whether cyclic fatigue resistance is increased for TF NTR files. Tests were performed with a cyclic fatigue device that evaluated cycles to failure of rotary instruments inside curved artificial canals. Results indicated that size 06-25 TF instruments showed a significant increase (P< .05). In the mean number of cycles to failurewhen compared to the other tested 06-25 NTR. Hence, it can be concluded that size 06-25 TF NTR instruments were found to be significantly more resistant to fatigue than those produced with the traditional grinding process.

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Goyal, Varun, and US Krishna Nayak. "Treatment of division II malocclusion in young adult with Forsus™ fatigue-resistant device." Indian Journal of Dental Research 23, no. 2 (2012): 289. http://dx.doi.org/10.4103/0970-9290.100444.

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Ren, Yongyuan, Jiangna Guo, Ziyang Liu, et al. "Ionic liquid–based click-ionogels." Science Advances 5, no. 8 (2019): eaax0648. http://dx.doi.org/10.1126/sciadv.aax0648.

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Gels that are freeze-resistant and heat-resistant and have high ultimate tensile strength are desirable in practical applications owing to their potential in designing flexible energy storage devices, actuators, and sensors. Here, a simple method for fabricating ionic liquid (IL)–based click-ionogels using thiol-ene click chemistry under mild condition is reported. These click-ionogels continue to exhibit excellent mechanical properties and resilience after 10,000 fatigue cycles. Moreover, due to several unique properties of ILs, these click-ionogels exhibit high ionic conductivity, transparency, and nonflammability performance over a wide temperature range (−75° to 340°C). Click-ionogel–based triboelectric nanogenerators exhibit excellent mechanical, freeze-thaw, and heat stability. These promising features of click-ionogels will promote innovative applications in flexible and safe device design.

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Jones, Graham, Peter H. Buschang, Ki Beom Kim, and Donald R. Oliver. "Class II Non-Extraction Patients Treated with the Forsus Fatigue Resistant Device Versus Intermaxillary Elastics." Angle Orthodontist 78, no. 2 (2008): 332–38. http://dx.doi.org/10.2319/030607-115.1.

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Abstract Objective: To evaluate the Forsus Fatigue Resistant Device (FRD) as a compliance-free alternative to Class II elastics. Materials and Methods: A sample of 34 (14 female, 20 male) consecutively treated nonextraction FRD patients (12.6 years of age) were matched with a sample of 34 (14 female, 20 male) consecutively treated nonextraction Class II elastics patients (12.2 years of age) based on four pretreatment variables (ANB, L1-GoMe, SN-GoMe, and treatment duration). Pretreatment and posttreatment cephalometric radiographs were traced and analyzed using the pitchfork analysis and a vertical cephalometric analysis. t-Tests were used to evaluate group differences. Group differences were evaluated using t-tests. Results: No statistically significant differences were found in the treatment changes between the groups. There was a general trend for mesial movement of the maxilla, mandible, and dentition during treatment for both groups. The mandibular skeletal advancement and dental movements were greater than those in the maxilla, which accounted for the Class II correction. Lower incisor proclination was evident in both groups. Vertically, the maxillary and mandibular molars erupted during treatment in both groups, while lower incisors proclined. With the exception of lower molar mesial movements and total molar correction, which were significantly (P &lt; .05) greater in the Forsus group, there were no statistically significant group differences in the treatment changes. Conclusions: The Forsus FRD is an acceptable substitute for Class II elastics for noncompliant patients.

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Elkordy, Sherif A., Ramy Abdeldayem, Mona M. S. Fayed, Ibrahim Negm, Dina El Ghoul, and Amr M. Abouelezz. "Evaluation of the splint-supported Forsus Fatigue Resistant Device in skeletal Class II growing subjects." Angle Orthodontist 91, no. 1 (2020): 9–21. http://dx.doi.org/10.2319/040320-250.1.

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ABSTRACT Objectives To evaluate the use of the Forsus Fatigue Resistant Device (FFRD), supported with bimaxillary splints, in treatment of skeletal Class II malocclusion. Materials and Methods Data from 46 skeletal Class II females who received either conventional Forsus alone (FFRD group) (15 patients, 12.54 ± 0.90 years), FFRD and bimaxillary splints (splint-FFRD group) (15 patients, 12.29 ± 0.82 years), or were untreated controls (16 subjects, 12.1 ± 0.9 years) were retrieved from previous clinical trials. FFRD was inserted onto the mandibular archwire in the FFRD group after leveling and alignment with multibracket appliances. In the splint-FFRD group, Forsus was inserted between fixed maxillary and mandibular splints. Treatment continued until reaching an edge-to-edge incisor relationship. Results Both treatment groups failed to induce significant mandibular skeletal effects compared to the normal growth exhibited by untreated controls. The splint-FFRD group showed significant reduction of SNA (−0.88° ± 0.51°) and ANB (−1.36° ± 0.87°). The mandibular incisors showed significant proclination in the FFRD (9.17° ± 2.42°) and splint-FFRD groups (7.06° ± 3.34°). Conclusions The newly proposed splint-supported FFRD was equally effective as the conventional FFRD in treatment of Class II malocclusion with dento-alveolar changes and additional maxillary restricting effect. It has an additional advantage of immediate initiation of the Class II correction.

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Akan, Burçin, and İlknur Veli. "Evaluation of soft-tissue changes in young adults treated with the Forsus fatigue-resistant device." American Journal of Orthodontics and Dentofacial Orthopedics 157, no. 4 (2020): 481–89. http://dx.doi.org/10.1016/j.ajodo.2019.05.014.

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Dada, Doa M., Maria Therese Galang-Boquiren, Grace Viana, Ales Obrez, and Budi Kusnoto. "Treatment effects of Forsus fatigue resistant device on class II malocclusion cases: A cephalometric evaluation." Journal of the World Federation of Orthodontists 4, no. 1 (2015): 14–17. http://dx.doi.org/10.1016/j.ejwf.2014.11.004.

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Elkordy, Sherif A., Amr M. Abouelezz, Mona M. Salah Fayed, Khaled H. Attia, Ramy Abdul Rahman Ishaq, and Yehya A. Mostafa. "Three-dimensional effects of the mini-implant–anchored Forsus Fatigue Resistant Device: A randomized controlled trial." Angle Orthodontist 86, no. 2 (2015): 292–305. http://dx.doi.org/10.2319/012515-55.1.

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ABSTRACT Objective: To detect three-dimensionally the effects of using mini-implant anchorage with the Forsus Fatigue Resistant Device (FFRD). Materials and Methods: The sample comprised 43 skeletal Class II females with deficient mandibles. They were randomly allocated into three groups: 16 patients (13.25 ± 1.12 years) received FFRD alone (Forsus group), 15 subjects (13.07 ± 1.41 years) received FFRD and mini-implants (FMI group), and 12 subjects (12.71 ± 1.44 years) were in the untreated control group. Three-dimensional analyses of cone beam computed tomographic images were completed, and the data were statistically analyzed. Results: Class I relationship and overjet correction were achieved in 88% of the cases. None of the two treatment groups showed significant mandibular skeletal effects. In the FMI group, significant headgear effect, decrease in maxillary width, and increase in the lower facial height were noted. In the FMI group, retroclination of maxillary incisors and distalization of maxillary molars were significantly higher. Proclination and intrusion of mandibular incisors were significantly greater in the Forsus group. Conclusions: FFRD resulted in Class II correction mainly through dentoalveolar effects and with minimal skeletal effects. Utilization of mini-implant anchorage effectively reduced the unfavorable proclination and intrusion of mandibular incisors but did not produce additional skeletal effects.

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Barth, Fernando André, Renata Rodrigues de Almeida-Pedrin, Maurício de Almeida Cardoso, Paula Vanessa Pedron Oltramari, Thaís Maria Freire Fernandes, and Ana Cláudia de Castro Ferreira Conti. "Perception of facial profile changes after treatment with Forsus fatigue-resistant device in Class II patients." Journal of the World Federation of Orthodontists 8, no. 2 (2019): 73–77. http://dx.doi.org/10.1016/j.ejwf.2019.03.002.

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Parvathy, Ram Mohan, Sandeep Shetty, and Parveen Katheesa. "Evaluation of changes seen in TMJ after mandibular advancement in treatment of Class II malocclusions, with functional appliances, a CBCT study." Biomedicine 41, no. 2 (2021): 236–42. http://dx.doi.org/10.51248/.v41i2.789.

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Introduction and Aim: Various functional appliances are developed to remodel the glenoid fossa and, thereby change the position of the mandible and correct Class II malocclusion. Many diagnostic aids have already been used to evaluate the changes ,but Cone Beam computed tomography (CBCT), three -dimensional diagnostic tool is rarely used .So this study was conducted with an aim is to evaluate the changes seen in the temporomandibular joint (TMJ) after mandibular advancement in class II malocclusions with functional appliance therapy, using CBCT, and also to assess and compare the efficacy of Twin Block, Power Scope and Forsus Fatigue Device used for the correction of class II malocclusion.Materials and Methods: The retrospective study was performed using the 52 CBCT scans of 26 patients with class II malocclusion due to retrognathic mandible. The subjects were divided into three groups based on appliance (Twin Block, Power Scope and Forsus Fatigue Resistant Device) used for the treatment. The changes seen in TMJ after mandibular advancement and condylar response to functional therapy was evaluated using the six. Data obtained were subjected to one-way Anova analysis with Posthoc Tukey test. Software SPSS version 20 was used to analyse the data. The level of significance was set at p < 0.05.Results: In subjects treated with Twin Block, the condyle was displaced slightly downwards and anteriorly; and condylar height was reduced. The decrease in the anterior and superior joint spaces were also found. In subjects treated with PowerScope and Forsus Fatigue Resistant Device, there was an increase in condylar height and width with a decrease in anterior and superior joint space.Conclusion: All three appliances were found to bring about changes in TMJ structures, but amongst them the Twin block has proved to be more efficient.

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Mészáros, István, and János Ginsztler. "Magnetic Investigation of Thermal Shock Fatigue Process." Key Engineering Materials 345-346 (August 2007): 1283–86. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1283.

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In the present paper we summarize some of our results obtained in the field of magnetic testing of thermal shock fatigue testing of power plant steels. In this work 15Mo3 type ferritic heat resistant steel was investigated. This steel and several similar grades are commonly used in power plants boilers as the material of reheating steam pipelines and pressure vessels. Their typical application temperature is about 500-550 °C. It is commonly accepted that a combined form of mechanical, thermal fatigue and the creep processes causes the long term deterioration of this structural steels. The applied thermal shock fatigue test can model the material degradation due to long term service in high temperature environment. A parallel motion vibrating sample magnetometer, an AC permeameter and a magnetic Barkhausen noise measuring device was used for testing the magnetic properties of the samples and several different magnetic properties were measured to characterize the microstructural processes of the deterioration.

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Cacciatore, Giorgio, Lisa Alvetro, Efisio Defraia, Luis Tomas Huanc Ghislanzoni, and Lorenzo Franchi. "Active-treatment effects of the Forsus fatigue resistant device during comprehensive Class II correction in growing patients." Korean Journal of Orthodontics 44, no. 3 (2014): 136. http://dx.doi.org/10.4041/kjod.2014.44.3.136.

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Franchi, Lorenzo, Lisa Alvetro, Veronica Giuntini, Caterina Masucci, Efisio Defraia, and Tiziano Baccetti. "Effectiveness of comprehensive fixed appliance treatment used with the Forsus Fatigue Resistant Device in Class II patients." Angle Orthodontist 81, no. 4 (2011): 678–83. http://dx.doi.org/10.2319/102710-629.1.

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Zhang, Ruofang, Yuxing Bai, and Song Li. "Use of Forsus fatigue-resistant device in a patient with Class I malocclusion and mandibular incisor agenesis." American Journal of Orthodontics and Dentofacial Orthopedics 145, no. 6 (2014): 817–27. http://dx.doi.org/10.1016/j.ajodo.2013.08.021.

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Bavbek, Nehir Canigur, Burcu Balos Tuncer, Cagri Turkoz, Cagri Ulusoy, and Cumhur Tuncer. "Changes in airway dimensions and hyoid bone position following class II correction with forsus fatigue resistant device." Clinical Oral Investigations 20, no. 7 (2015): 1747–55. http://dx.doi.org/10.1007/s00784-015-1659-1.

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İnce-Bingöl, Sinem, and Burçak Kaya. "Pharyngeal airway and hyoid bone position changes of skeletal anchored Forsus Fatigue Resistant Device and activator appliances." Clinical Oral Investigations 25, no. 8 (2021): 4841–50. http://dx.doi.org/10.1007/s00784-021-03789-9.

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Eiselstein, Lawrence E., and Robert D. Caligiuri. "Ion Leaching from Implantable Medical Devices." Materials Science Forum 638-642 (January 2010): 754–59. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.754.

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Implantable medical devices must be able to withstand the corrosive environment of the human body for 10 or more years without adverse consequences. Most reported research and development has been on developing materials and devices that are biocompatible and resistant to corrosion-fatigue, pitting, and crevice corrosion. However, little has been directly reported regarding implantable materials with respect to the rate at which they generate soluble ions in-vivo. Most of the biocompatibility studies have been done by examining animal implants and cell cultures rather than examining the rate at which these materials leach ions into the body. This paper will discuss what is currently known about the rate at which common implant materials (such as stainless steels, cobalt-chromium alloys, and nitinol) elute ions under in vitro conditions, what the limitations are of such data, and how this data can be used in medical device development.

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Yavan, Mehmet Ali, Merve Aycan, Dicle Aksoyler, and Aysegul Essiz. "Comparison of twin block appliance and Forsus Fatigue Resistant Device therapies on uvulo-glossopharyngeal dimensions: A retrospective study." APOS Trends in Orthodontics 11 (April 10, 2021): 23–31. http://dx.doi.org/10.25259/apos_173_2020.

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Objectives: The aim of this study was to compare the effects of two different functional appliances on skeletal, dental, and uvulo-glossopharyngeal dimensions. Materials and Methods: Pre- and post-treatment lateral cephalograms of 50 adolescent Class II patients with a retrognathic mandible were obtained from an archive and divided into two groups according to functional therapy. Twenty-five patients (14 females, 11 males, mean age: 13.5 ± 2.8) who were treated with Forsus Fatigue Resistant Device (FFRD) and 25 patients (17 females, eight males, mean age: 12.5 ± 0.4) who had received functional therapy through the twin block (TWB) were enrolled. Skeletal, dentoalveolar, tongue, uvula, hyoid position, and oropharyngeal airway parameters were measured using the Dolphin software, and uvulo-glossopharyngeal area measurements were performed with the AutoCAD software. Results: The TWB group exhibited remarkable mandibular advancement compared to the FFRD group (P < 0.05). Both of the treatments proclined mandibular incisors, and tongue dimensions increased significantly in both groups (P < 0.05). While the hyoid point moved forward and the oropharyngeal area increased significantly in the TWB group, no significant changes were observed in the FFRD group. The comparison of the TWB and FFRD groups with regard to uvulo-glossopharyngeal dimensions showed no significant differences between the groups (P > 0.05). Conclusion: Changes in uvulo-glossopharyngeal dimensions did not significantly vary between the two different functional therapies.

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Hart, Genevieve A., Scott D. Moss, Dylan J. Nagle, and Steve C. Galea. "Endurance Testing of a Vibration Energy Harvester for Structural Health Monitoring." Advanced Materials Research 891-892 (March 2014): 1261–67. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1261.

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The Australian Defence Science and Technology Organisation (DSTO) is developing a variety of in-situ structural health monitoring (SHM) approaches for potential use in high value platforms across the Australian Defence Force (ADF). The implementation of SHM systems would allow the ADF to move from expensive interval based inspection and maintenance regimes for ageing platforms to more cost-effective condition-based approaches, and therefore reduce aircraft through - life support costs. One critical issue is determining the optimal means of supplying power to these in-situ SHM systems. To address this issue DSTO has developed a bi-axial vibration energy harvesting approach based on a vibrating spherical-mass, magnet and wire-coil transducer arrangement. It is important that the vibration energy harvesting devices themselves are resistant to fatigue and wear related damage as they may need to operate in service for many years. This paper examines work done on mitigating wear effects in vibration energy harvesting devices, with the goal of ensuring device longevity.

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Eissa, Osama, Mahmoud El-Shennawy, Safaa Gaballah, Ghada El-Meehy, and Tarek El Bialy. "Treatment outcomes of Class II malocclusion cases treated with miniscrew-anchored Forsus Fatigue Resistant Device: A randomized controlled trial." Angle Orthodontist 87, no. 6 (2017): 824–33. http://dx.doi.org/10.2319/032717-214.1.

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ABSTRACT 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 12.82 ± 0.9 years) received no treatment as a control group. Linear and angular measurements were made on lateral cephalograms before and immediately after Forsus treatment. Data were analyzed statistically using paired t-, ANOVA, and Tukey tests. Results: Class I molar relationship and overjet correction were achieved in both treatment groups. Although mandibular growth was statistically nonsignificant, there was a significant headgear effect on the maxilla. Mandibular incisor proclination, maxillary incisor retroclination, and distalization of maxillary molars were significant in both treatment groups. However, no significant differences were found between the treatment groups. Conclusions: Class II correction was mainly dentoalveolar in both treatment groups. Use of miniscrews with Forsus did not enhance mandibular forward growth nor prevent labial tipping of the mandibular incisors.

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Elkordy, Sherif A., Amr M. Abouelezz, Mona M. S. Fayed, Mai H. Aboulfotouh, and Yehya A. Mostafa. "Evaluation of the miniplate-anchored Forsus Fatigue Resistant Device in skeletal Class II growing subjects: A randomized controlled trial." Angle Orthodontist 89, no. 3 (2018): 391–403. http://dx.doi.org/10.2319/062018-468.1.

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ABSTRACT Objectives: To evaluate the use of direct miniplate anchorage in conjunction with the Forsus Fatigue Resistant Device (FFRD) in treatment of skeletal Class II malocclusion. Materials and Methods: Forty-eight females with skeletal Class II were randomly allocated to the Forsus plus miniplates (FMP) group (16 patients, age 12.5 ± 0.9 years), Forsus alone (FFRD; 16 patients, age 12.1 ± 0.9 years), or the untreated control group (16 subjects, age 12.1 ± 0.9 years). After leveling and alignment, miniplates were inserted in the mandibular symphysis in the FMP group. The FFRD was inserted directly on the miniplates in the FMP group and onto the mandibular archwires in the FFRD group. The appliances were removed after reaching an edge-to-edge incisor relationship. Results: Data from 46 subjects were analyzed. The effective mandibular length significantly increased in the FMP group only (4.05 ± 0.78). The mandibular incisors showed a significant proclination in the FFRD group (9.17 ± 2.42) and a nonsignificant retroclination in the FMP group (−1.49 ± 4.70). The failure rate of the miniplates was reported to be 13.3%. Conclusions: The use of miniplates with the FFRD was successful in increasing the effective mandibular length in Class II malocclusion subjects in the short term. The miniplate-anchored FFRD eliminated the unfavorable mandibular incisor proclination in contrast to the conventional FFRD.

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Giuntini, Veronica, Andrea Vangelisti, Caterina Masucci, Efisio Defraia, James A. McNamara Jr, and Lorenzo Franchi. "Treatment effects produced by the Twin-block appliance vs the Forsus Fatigue Resistant Device in growing Class II patients." Angle Orthodontist 85, no. 5 (2015): 784–89. http://dx.doi.org/10.2319/090514-624.1.

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ABSTRACT Objective: To compare the dentoskeletal changes produced by the Twin-block appliance (TB) followed by fixed appliances vs the Forsus Fatigue Resistant Device (FRD) in combination with fixed appliances in growing patients having Class II division 1 malocclusion. Materials and Methods: Twenty-eight Class II patients (19 females and 9 males; mean age, 12.4 years) treated consecutively with the TB followed by fixed appliances were compared with a group of 36 patients (16 females and 20 males; mean age, 12.3 years) treated consecutively with the FRD in combination with fixed appliances and with a sample of 27 subjects having untreated Class II malocclusion (13 females and 14 males; mean age, 12.2 years). Mean observation interval was 2.3 years in all groups. Cephalometric changes were compared among the three groups by means of ANOVA and Tukey's post hoc tests. Results: The FRD produced a significant restraint of the maxilla compared with the TB and control samples (SNA, −1.1° and −1.8°, respectively). The TB sample exhibited significantly greater mandibular advancement and greater increments in total mandibular length than either the FRD or control groups (SNB, 1.9° and 1.5°, respectively; and Co-Gn, 2.0 mm and 3.4 mm, respectively). The FRD produced a significantly greater amount of proclination of the mandibular incisors than what occurred with the TB or the control samples (2.9° and 5.6°, respectively). Conclusion: The TB appliance produced greater skeletal effects in terms of mandibular advancement and growth stimulation while the Forsus caused significant proclination of the mandibular incisors.

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Elkordy, Sherif A., Mona M. Salah Fayed, Amr M. Abouelezz, and Khaled H. Attia. "Comparison of patient acceptance of the Forsus Fatigue Resistant Device with and without mini-implant anchorage: A randomized controlled trial." American Journal of Orthodontics and Dentofacial Orthopedics 148, no. 5 (2015): 755–64. http://dx.doi.org/10.1016/j.ajodo.2015.06.015.

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Jivrajani, Sagar, and Wasundhara Bhad. "Treatment of class II malocclusion in young patient with ForsusTM fatigue resistant device and non extraction approach: A case report." IP Indian Journal of Orthodontics and Dentofacial Research 6, no. 1 (2020): 24–27. http://dx.doi.org/10.18231/j.ijodr.2020.007.

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Turkkahraman, Hakan, Sule Kocabas Eliacik, and Yavuz Findik. "Effects of miniplate anchored and conventional Forsus Fatigue Resistant Devices in the treatment of Class II malocclusion." Angle Orthodontist 86, no. 6 (2016): 1026–32. http://dx.doi.org/10.2319/122515-887.1.

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ABSTRACT Objective: To compare the skeletal, dentoalveolar, and soft tissue effects of the miniplate anchored Forsus Fatigue Resistant Device (FRD) and the conventional Forsus FRD in the treatment of Class II malocclusion. Materials and Methods: The study was carried out with 30 patients (10 girls, 20 boys). In the MA-Forsus group, 15 patients (2 girls, 13 boys) were treated with a miniplate anchored Forsus FRD for 9.40 ± 2.25 months. In the C-Forsus group, 15 patients (8 girls, 7 boys) were treated with a conventional Forsus FRD for 9.46 ± 0.81 months. A total of 16 measurements were calculated and statistically analyzed to find intragroup and intergroup differences. Results: Statistically significant differences were found between the groups in IMPA, SN/Occ, SN/GoGn, overjet, overbite, and Li-S measurements (P &lt; .05). In the C-Forsus group, a substantial amount of lower incisor protrusion was observed, whereas retrusion was found in the MA-Forsus group (P &lt; .001). The mandible rotated backward in the MA-Forsus group, whereas it remained unchanged in the C-Forsus group (P &lt; .05). Reductions in overjet (P &lt; .001) and overbite were greater in the C-Forsus group (P &lt; .05). Conclusion: Stimulation of mandibular growth and inhibition of maxillary growth were achieved in both treatment groups. In the C-Forsus group, a substantial amount of lower incisor protrusion was observed, whereas retrusion of lower incisors was found in the MA-Forsus group. The MA-Forsus group was found to be more advantageous as it had no dentoalveolar side effects on mandibular dentition.

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ElKordy, Sherif, Amr Aboulezz, Mona Fayed, Mai Aboulfotouh, and Yehya Mostafa. "Use of direct miniplate anchorage in conjugation with Forsus Fatigue Resistant device in class II growing females: a randomized controlled trial." Egyptian Orthodontic Journal 54, no. 12 (2018): 19–38. http://dx.doi.org/10.21608/eos.2018.77159.

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Aslan, Belma. "RE: response to: Treatment effects of the Forsus Fatigue Resistant Device used with miniscrew anchorage. The Angle Orthodontist. 2014;84:76–87." Angle Orthodontist 84, no. 5 (2014): 934. http://dx.doi.org/10.2319/0003-3219-84.5.934.

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Bayram, Mehmet. "Combined orthodontic-orthopedic treatment of an adolescent Class II Division 2 patient with extreme deepbite using the Forsus Fatigue Resistant Device." American Journal of Orthodontics and Dentofacial Orthopedics 152, no. 3 (2017): 389–401. http://dx.doi.org/10.1016/j.ajodo.2016.07.023.

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Aras, Aynur, Emel Ada, Hatice Saracoğlu, Naciye S. Gezer, and Isil Aras. "Comparison of treatments with the Forsus fatigue resistant device in relation to skeletal maturity: A cephalometric and magnetic resonance imaging study." American Journal of Orthodontics and Dentofacial Orthopedics 140, no. 5 (2011): 616–25. http://dx.doi.org/10.1016/j.ajodo.2010.12.018.

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Beer, Tomasz M., Neal D. Shore, Alicia K. Morgans, et al. "DaroACT: Darolutamide and enzalutamide effects on physical and neurocognitive function and daily activity in patients with castration-resistant prostate cancer (CRPC)." Journal of Clinical Oncology 38, no. 15_suppl (2020): TPS5587. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.tps5587.

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TPS5587 Background: The androgen receptor inhibitors (ARIs) apalutamide and enzalutamide (Enza) are approved for the treatment of men with advanced prostate cancer. These ARIs are associated with adverse events (AEs) including fatigue, neurocognitive dysfunction, and falls. Darolutamide (Daro) is a structurally distinct ARI approved by the FDA to treat nonmetastatic CRPC, based on significantly improved metastasis-free survival vs placebo in the ARAMIS Phase III clinical trial. Daro was not associated with a significant increase in AEs beyond that of concomitant androgen deprivation therapy, compared with placebo. DaroAcT is the first prospective trial to compare the effects of Daro to those of Enza on physical and neurocognitive function, and daily physical activity, in men with CRPC. Methods: This randomized, open-label, multicenter, Phase IIb trial (NCT04157088), involving ~20 sites across the US, is open for enrollment. After a lead-in phase of 30 pts treated with Daro alone, approximately 120 pts will be randomized 1:1 to receive Daro (600 mg twice daily) or Enza (160 mg once daily). Eligibility criteria include CRPC (metastatic and non-metastatic); age ≥18 years; Karnofsky performance status ≥80; no prior abiraterone within 6 months of enrollment, and no prior immunotherapy or apalutamide. All patients will continue luteinizing hormone-releasing hormone agonist or antagonist treatment for the duration of the study. The primary endpoint is the proportion of pts with slowed Timed Up and Go (TUG) time during the 24-week period from baseline. Secondary endpoints include the proportion of pts with worsening in short Physical Performance Battery (sPPB), mean change from baseline in daily physical activity, the proportion of pts with a decline in neurocognitive function or worsening of fatigue, and AEs. This study uses objective measures to assess physical function, including TUG and sPPB, measurements of daily activity levels with an accelerometry device for ≥7 days at designated time points, and neurocognitive tests. Fatigue is measured using the Brief Fatigue Inventory. Primary completion is estimated to be December 31, 2022. Clinical trial information: NCT04157088 .

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Patil, Harshal Ashok, Pawankumar Dnyandeo Tekale, Veerendra V. Kerudi, Jitendra S. Sharan, Ratnadip Arunrao Lohakpure, and Nakul N. Mude. "Assessment of stress changes in dentoalveolar and skeletal structures of the mandible with the miniplate anchored Forsus: A three-dimensional finite element stress analysis study." APOS Trends in Orthodontics 7 (April 1, 2017): 87–93. http://dx.doi.org/10.4103/apos.apos_121_16.

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ObjectiveThe study conducted to assess the effects of a fixed functional appliance (Forsus Fatigue Resistant Device; 3M Unitek, Monrovia, CA, USA) on the mandible with three-dimensional (3D) finite element stress analysis.Materials and MethodsA 3D finite element model of mandible with miniplate at mandibular symphysis was prepared using SolidEdge software along with the plate geometry. The changes were deliberated with the finite element method, in the form of highest von Mises stress and maximum principal stress regions.ResultsMore areas of stress were seen in the model of the mandible at cortical bone in canine region at bone and miniplate interface.ConclusionsThis fixed functional appliance studied by finite element model analysis caused more von Mises stress and principal stress in both the cortical bone and the condylar region.

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Celikoglu, Mevlut. "Re: Aslan BI, Kucukkaraca E, Turkoz C, Dincer M. Treatment effects of the Forsus Fatigue Resistant Device used with miniscrew anchorage.The Angle Orthodontist. 2014;84:76–87." Angle Orthodontist 84, no. 5 (2014): 933. http://dx.doi.org/10.2319/0003-3219-84.5.933.

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Bakdach, Wesam Mhd Mounir, and Rania Hadad. "Is there any enhanced treatment effect on class II growing patients when Forsus Fatigue Resistant Device is reinforced by either miniplates or miniscrews? A systematic review and meta-analysis." International Orthodontics 19, no. 1 (2021): 15–24. http://dx.doi.org/10.1016/j.ortho.2021.01.003.

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Lim, Jea Seang, Tae Sung Park, Yu Min Choi, and Ik Keun Park. "Improvement in Accuracy of a Multi-Joint Robotic Ultrasonic Inspection System for the Integrity of Composite Structures." Applied Sciences 10, no. 19 (2020): 6967. http://dx.doi.org/10.3390/app10196967.

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Composite materials have attracted significant attention with regard to the manufacturing of structures that require weight reduction, such as automobiles and aircraft, because they are more resistant to corrosion and fatigue than conventional metal materials. However, such materials exhibit a reliability degradation problem, i.e., their mechanical and physical properties deteriorate due to the occurrence of delamination and voids. Ultrasonic inspection methods have been widely applied for nondestructive detection of such defects in structures; however, the application of these approaches has been impeded due to high anisotropy and acoustic attenuation. In addition, the existing ultrasonic inspection methods require considerable time and cost for the inspection of large materials or structures. These problems were addressed in this study by developing an automatic ultrasonic inspection system; this was achieved by adopting a squirter-type water injection device, which uses a multi-joint robot and the through-transmission ultrasonic method. In addition, a software program to correct axis misalignment was developed and verified to solve the deterioration in defect detectability and accuracy that was caused by axis misalignment, which may occur during the use of the developed system. This development was accomplished after measuring the coordinates of the deformed mechanical part using a three-dimensional laser measuring instrument.

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Ozdemir, Fulya, Feyza Ulkur, and Didem Nalbantgil. "Effects of fixed functional therapy on tongue and hyoid positions and posterior airway." Angle Orthodontist 84, no. 2 (2013): 260–64. http://dx.doi.org/10.2319/042513-319.1.

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ABSTRACT Objective: To evaluate how therapy with a fixed functional appliance affects airway dimensions, dentoalveolar changes, and tongue and hyoid positions. Materials and Methods: A retrospective study was carried out on 46 pre- and posttreatment lateral cephalometric radiographs of 23 post-peak Class II patients (12 girls, 11 boys) treated with a Forsus Fatigue Resistant Device (FRD) appliance. The radiographies were taken at the start and at the end of Forsus FRD appliance therapy when a Class I or overcorrected Class I canine and molar relationship was achieved. The process took an average of 5 months 13 days ± 1 month 4 days. Skeletal and dental parameters were measured using Dolphin software, and the sagittal airway area was measured by AutoCAD software. Results: Analyses of the pre- and posttreatment means revealed that there was no statistically significant skeletal correction of the sagittal malocclusion; increase of lower incisor inclination, decrease of upper incisor inclination, decrease of interincisal angle, and rotation of occlusal plane all contributed to the reduction of overjet. The tongue area and intermaxillary space area increased in response to these dentoalveolar changes; however, there was no statistically significant change in the hyoid position or the oropharyngeal area between the two time points. Conclusions: The dentoalveolar changes produced by Forsus FRD appliance did not cause any significant posterior airway changes in young adult patients.

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Unal, Tuba, Mevlut Celikoglu, and Celal Candirli. "Evaluation of the effects of skeletal anchoraged Forsus FRD using miniplates inserted on mandibular symphysis: A new approach for the treatment of Class II malocclusion." Angle Orthodontist 85, no. 3 (2014): 413–19. http://dx.doi.org/10.2319/051314-345.1.

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ABSTRACT Objective: To evaluate the skeletal, dentoalveolar, and soft tissue effects of the Forsus Fatigue Resistant Device (FRD) appliance with miniplate anchorage for the treatment of skeletal Class II malocclusion. Material and Methods: The prospective clinical study group included 17 patients (11 girls and 6 boys; mean age 12.96 ± 1.23 years) with Class II malocclusion due to mandibular retrusion and treated with skeletal anchoraged Forsus FRD. After 0.019 × 0.025-inch stainless steel archwire was inserted and cinched back in the maxillary arch, two miniplates were placed bilaterally on the mandibular symphysis. Then, the Forsus FRD EZ2 appliance was adjusted to the miniplates without leveling the mandibular arch. The changes in the leveling and skeletal anchoraged Forsus FRD phases were evaluated by means of the Paired and Student's t-tests using the cephalometric lateral films. Results: The success rate of the miniplates was found to be 91.5% (38 of 42 miniplates). The mandible significantly moved forward (P &lt; .001) and caused a significant restraint in the sagittal position of the maxilla (P &lt; .001). The overjet correction (−5.11 mm) was found to be mainly by skeletal changes (A-VRL, −1.16 mm and Pog-VRL, 2.62 mm; approximately 74%); the remaining changes were due to the dentoalveolar contributions. The maxillary and mandibular incisors were significantly retruded (P &lt; .001). Conclusion: This new approach was an effective method for treating skeletal Class II malocclusion due to the mandibular retrusion via a combination of skeletal and dentoalveolar changes.

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Eissa, Osama, Mahmoud ElShennawy, Safaa Gaballah, Ghada ElMehy, and Tarek El-Bialy. "Treatment of Class III malocclusion using miniscrew-anchored inverted Forsus FRD: Controlled clinical trial." Angle Orthodontist 88, no. 6 (2018): 692–701. http://dx.doi.org/10.2319/110717-760.1.

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ABSTRACT Objectives: To evaluate the skeletal, dental, and soft tissue changes after the use of miniscrew-anchored inverted Forsus fatigue-resistant device (FRD) in treatment of Class III malocclusion. Materials and Methods: In this controlled clinical trial, 16 patients (9 girls and 7 boys; age 12.45 ± 0.87 years) were consecutively treated with miniscrew-anchored inverted Forsus FRD. This group was compared with a matched control group of 16 untreated patients (8 girls and 8 boys; age 11.95 ± 1.04 years). Miniscrews were inserted bilaterally between the maxillary canine and first premolar. Forsus FRD was selected and inserted in an inverted manner mesial to the mandibular headgear tube and distal to the maxillary canine bracket. Results: Class I molar and canine relationships with positive overjet were achieved in an average period of 6.4 ± 1.46 months. Maxillary forward growth showed a statistically significant increase (SNA°: 1.73 ± 0.53, P &lt; .5), maxillary incisor proclination was statistically significant (U1 to NA°: −0.39 ± 0.33, P &gt; .5), and the lower incisors exhibited significant retroclination (L1 to NB°: 1.65 ± 0.83, P &lt; .5). Significant lower lip retrusion and upper lip protrusion were obvious treatment outcomes (P &lt; .5). Conclusions: The use of miniscrew-anchored inverted FRD could effectively increase maxillary forward growth, but it did not prevent mesial movement of the maxillary dentition. Significant lower incisor retroclination was observed. Significant esthetic improvement of the facial profile was achieved primarily because of lower lip retrusion and upper lip protrusion.

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Sudhakar, P., Sunil Arora, Amit Maheshwari, et al. "Biomechanical and Clinical Considerations in correcting Skeletal Class II Malocclusion with ForsusTM." Journal of Contemporary Dental Practice 13, no. 6 (2012): 918–24. http://dx.doi.org/10.5005/jp-journals-10024-1254.

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ABSTRACT Aim The present case report describes the importance of understanding of biomechanical and clinical considerations in application of Forsus appliance in correction of class II skeletal malocclusion. Background Angle's class II malocclusion is one of the most prevailing that may be either skeletal or dental presenting with different clinical manifestations. There are number of appliances to treat such a malocclusion in a growing child. Fixed functional appliances are indicated for class II corrections in patients who report late with minimal residual growth left. Case description A case of class II skeletal and dental malocclusion treated with preadjusted edgewise appliance supplemented with Forsus Fatigue Resistant Device (FRD) (3M Unitek Corp, California, USA) is reported. Conclusion Forsus device is an effective alternative in treating moderate skeletal class II malocclusion. The Forsus FRD (3M Unitek Corp, California, USA) can be used instead of class II elastics in mild cases and in place of Herbst appliance in severe cases. Alteration of force vector by modifying the archwire as shown in this case report while applying Forsus and incorporation of 10 degree labial root torque in lower archwire will minimize the effects on dentition. Engaging modules or tubing on to the pushrod and leaving 1 to 2 mm clearance between distal end of the upper tube and L-pin as shown in this case report will significantly improve the patient compliance. Clinical significance Much emphasis should be given to biomechanical considerations which were discussed in this article while treating patients with Forsus to prevent the unwanted effects. Clinical considerations and certain modifications advised in this case report should be utilized while treating class II skeletal malocclusions with Forsus appliance to eliminate the patient cooperation factor and make treatment time estimates much more accurate. How to cite this article Adusumilli SP, Sudhakar P, Mummidi B, Varma DPK, Arora S, Radhika A, Maheshwari A. Biomechanical and Clinical Considerations in correcting Skeletal Class II Malocclusion with ForsusTM. J Contemp Dent Pract 2012; 13(6):918-924.

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Chuong, Le Hong, Ung Quoc Trang, and Ngo Lam. "Asphalt concrete testing device: Studying and designing based on the properties of asphalt concrete." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 13, no. 1 (2019): 60–65. http://dx.doi.org/10.31814/stce.nuce2019-13(1)-06.

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With the purpose of obtaining the shear strength parameters (friction angle, φ, and cohesion, c) of asphalt concretes. At the present time, almost the testing devices were designed based on the condition of the vehicle's load when they are moving on the pavement structure. That means, the fatigue resistance of the interfaces was determined through the loads acting at the interfaces between layers are repetitive mechanical action of the moving vehicles. With that view, the ratio of the normal and shear fatigue loads of asphalt concrete was not considered in terms of the nature of the material. An asphalt concrete testing device is proposed based on the modification from AST-2 instrument and Shear Fatigue Test instrument. The main parameters of this device are calculated from the ratio of shear stress and normal stress at the fatigue of the asphalt concrete according to the Mohr-Coulomb failure criterion. Test results with asphalt specimens show that the device is stable, the acting vertical loads were smaller and more stable. Keywords: normal strength; shear stress; asphalt concrete; fatigue stresses. Received 4 December 2018, Revised 20 December 2018, Accepted 24 January 2019

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Krbata, Michal, Maros Eckert, Jozef Majerik, and Igor Barenyi. "Wear Behaviour of High Strength Tool Steel 90MnCrV8 in Contact with Si3N4." Metals 10, no. 6 (2020): 756. http://dx.doi.org/10.3390/met10060756.

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Tool steels are used in technological processes of forming and cutting and as cutting tools due to their good mechanical properties. During their working cycle, steels are exposed to several aggressive conditions, such as thermal stress, fatigue and various forms of wear. In this article, the selected 90MnCrV8 tool steel slid against the Si3N4 testing ceramic bearing ball. All measurements were performed on a universal tribometric device UMT TriboLab (TA Instruments, New Castle, Delaware, USA) under dry conditions. The main objective of the performed experiments was to analyse the frictional properties and compare the wear of the 90MnCrV8 tested tool steel in contact with the 6.35 mm diameter ceramic ball at different friction speeds. In this measurement evaluation, the authors of the article mainly focused on the influence of the magnitude of the peripheral speed on the wear change and coefficient of friction. Further analysis was focused on the change of surface roughness of the counterpart ceramic balls as well as of the tested tool steel samples. Experimental results show the fact that tested tool steels, which can also be considered as high strength steels, can also successfully represent wear-resistant steels. It has been shown experimentally that increasing the friction speed also leads to significant degradation of the material on the sample surface. Finally, the effect of hardness on wear has also been experimentally demonstrated. The Si3N4 ceramic ball with its high strength also behaves like an abrasive, thus increasing the wear rate on the experimental tool steel samples.

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Murarka, Shriya Prakash, Sunita Shrivastav, Ranjit Kamble, et al. "Comparative Evaluation of Discomfort, Expectations and Functional Experiences during Treatment of Class II Malocclusion with Forsus Fixed Functional Appliance and Sharma’s Class II Corrector - A Questionnaire Based Survey." Journal of Evolution of Medical and Dental Sciences 10, no. 8 (2021): 474–78. http://dx.doi.org/10.14260/jemds/2021/104.

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BACKGROUND The Forsus fatigue resistant device (FFRD) appliance is known to correct Class II malocclusion. The disadvantage of it are labial flaring of lower incisors, distalisation and extrusion of maxillary molars, difficulty in procuring the appliances in remote areas and cost. No research has documented the comparison of patient’s experience with FFRD and Sharma’s Class II corrector appliance. Therefore, a questionnaire survey was conducted. METHODS 40 patients having Class II Division 1 malocclusion were included and were divided into two groups- FFRD appliance (group 1, 20 patients) and Sharma’s Class II corrector (group 2, 20 patients). A questionnaire was framed that consisted of 15 questions. Descriptive and analytical statistics was done using SPSS software. The difference in proportions was calculated by chi-square test. The level of significance was set at P < 0.05. RESULTS 30 % of cases in group 2 indicated that the Sharma’s Class II corrector looks good (Q1) as compared to 15 % in group 1. (P = 0.630) 5 % indicated it was not aesthetic in group 2 as compared to 10 % in group 1. 30 % of cases in group 1 indicated that there were problems associated with speech as compared to 0 % in group 2. (P < 0.05). Values were statistically significant. CONCLUSIONS Sharma’s Class II corrector has similar patient acceptance as compared to FFRD appliance with the additional benefit of cost effectiveness. Hence, this can be considered as a better option in treating Class II malocclusion with fixed therapy. KEY WORDS FFRD, Fixed Function Appliance, Economic Orthodontics, Growth Modification, Sharma’s Class II Corrector

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Prieto-Diaz, Cynthia, Mathew R. Anderle, Laura Zagrocki Brinker, Randall Allard, and Jeremi Leasure. "Biomechanical Comparison of First Tarsometatarsal Arthrodesis Constructs Over Prolonged Cyclic Testing." Foot & Ankle Orthopaedics 4, no. 4 (2019): 247301141989224. http://dx.doi.org/10.1177/2473011419892240.

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Background: Traditionally, a lengthy period of nonweightbearing is required following arthrodesis of the first tarsometatarsal (TMT) joint in order to provide a stable healing environment for the bones. The goal of this research was to determine the resistance to plantar gapping of 2 locked intramedullary devices and a medial plate with crossing screw, all specifically designed for hallux valgus correction, and compare them to traditional 2–crossing screw fixation under a cyclic testing protocol. We hypothesized the locked intramedullary devices and the medial plate with crossing screw would better resist plantar gapping. Methods: Forty cadaver specimens received 1 of 4 operative treatments: a locked intramedullary device with 2 points of fixation in the cuneiform, a locked intramedullary device with 1 point of fixation in the cuneiform, a medial plate with crossing screw, or 2 crossing screws. We applied dorsiflexion bending forces to the first TMT joint using a cadaveric fatigue model for 20 000 cycles. The plantar gap between the metatarsal and cuneiform was measured at the beginning and end of cyclic testing. Thirty-six specimens were included in the final data set. Results: Both locked intramedullary device groups and the medial plate with crossing screw group exhibited significantly less gap widening compared to the 2–crossing screw group (vs 3-hole intramedullary device, P = .014; vs 4-hole intramedullary device, P = .010; and vs medial plate with crossing screw, P = .044). The intramedullary device groups were the most stable during the cyclic fatigue test, exhibiting the smallest gap widening. The medial plate with crossing screw fixation was also more stable than crossing screws in the cyclic fatigue model. Conclusions: The locked intramedullary devices and medial plate with crossing screw resisted plantar gapping better than 2 crossing screws when used for first TMT arthrodesis. Clinical Relevance: These results indicate that locked intramedullary devices and medial plates with crossing screws may promote superior bone healing and may better tolerate early weightbearing compared with 2 crossing screws.

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Askew, Graham N., Valerie M. Cox, John D. Altringham, and David F. Goldspink. "Mechanical properties of the latissimus dorsi muscle after cyclic training." Journal of Applied Physiology 93, no. 2 (2002): 649–59. http://dx.doi.org/10.1152/japplphysiol.00218.2002.

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Cardiomyoplasty is a procedure developed to improve heart performance in patients suffering from congestive heart failure. The latissimus dorsi (LD) muscle is surgically wrapped around the failing ventricles and stimulated to contract in synchrony with the heart. The LD muscle is easily fatigued and as a result is unsuitable for cardiomyoplasty. For useful operation as a cardiac-assist device, the fatigue resistance of the LD muscle must be improved while retaining a high power output. The LD muscle of rabbits was subjected to a training regime in which cyclic work was performed. Training transformed the fiber-type composition from approximately equal proportions of fast oxidative glycolytic (FOG) and fast glycolytic (FG) fibers to one composed of almost entirely of FOG with no FG, which increased fatigue resistance while retaining rapid contraction kinetics. Muscle mass and cross-sectional area increased but power output decreased, relative to control muscles. This training regime represents a significant improvement in terms of preserving muscle mass and power compared with other training regimes, while enhancing fatigue resistance, although some fiber damage occurred. The power output of the trained LD muscle was calculated to be sufficient to deliver a significant level of assistance to a failing heart during cardiomyoplasty.

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Journal articles on the topic 'Fatigue Resistant Device'

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