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Articoli di riviste sul tema "Fixed arches"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 4 febbraio 2022

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1

Pi, Y. L. "Elastic flexural-torsional buckling of fixed arches". Quarterly Journal of Mechanics and Applied Mathematics 57, n. 4 (1 novembre 2004): 551–69. http://dx.doi.org/10.1093/qjmam/57.4.551.

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2

Xi, Kuan Tang, Jin Li, Tie Gang Zhou e Qing Xing Xu. "Out-of-Plane Stability Analysis of U-Section Pin-End Steel Arch". Applied Mechanics and Materials 351-352 (agosto 2013): 169–73. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.169.

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Two kinds of finite element model which can reflect the effects of different loading positions were constructed with Beam 188 and Shell 181. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. As for out-of-plane stability, pin-end arches are better than fixed arches when rise-span ratio is big. Compared with U-section pin-end circular arches with diaphragm, those with batten plates have batter out-of-plane stability, and they are more economical and easier to construct.

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3

Xi, Kuan Tang, Jin Li, Tie Gang Zhou e Tao Lin. "Out-of-Plane Stability Analysis of I-Section Steel Arch". Applied Mechanics and Materials 405-408 (settembre 2013): 781–85. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.781.

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Finite element model which can reflect the effects of different loading positions were constructed with Beam 188. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. For ideal restraints, out-of-plane stability of pin-end arches is better than fixed arches when rise-span ratio is big. Effects of different loading positions on out-of-plane buckling were studied. Buckling loads of arches which are loaded at arch-axises are bigger than those of top flanges, but smaller than those of bottom flanges.

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4

Liu, Airong, Zhicheng Yang, Hanwen Lu, Jiyang Fu e Yong-Lin Pi. "Experimental and analytical investigation on the in-plane dynamic instability of arches owing to parametric resonance". Journal of Vibration and Control 24, n. 19 (11 agosto 2017): 4419–32. http://dx.doi.org/10.1177/1077546317726210.

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When an arch is subjected to a periodic load, it may lose in-plane stability dynamically owing to parametric resonance. Previous investigations have been concentrated on in-plane dynamic buckling of pin-ended shallow arches. However, in engineering practice, fixed arches with different rise-to-span ratios are often encountered. Little research on in-plane dynamic instability of deep fixed arches has been reported in the literature. This paper is concerned with experimental and analytical investigations for in-plane dynamic instability of fixed circular arches with rise-to-span ratios 1/8–1/2 under a central periodic load owing to parametric resonance. Experiments are carried out to determine the in-plane frequency and damping ratio of arches, to investigate critical regions of frequencies and amplitudes of the periodic load for in-plane dynamic instability of arches, and to explore effects of the rise-to-span ratio and additional weights on dynamic instability. The analytical method for determining the region of excitation frequencies and amplitudes of the periodic load causing in-plane instability of the arch is established using the Hamilton’s principle by accounting for effects of additional concentrated weights. Comparisons of analytical solutions with test results show that they agree with each other quite well. These results show that the rise-to-span ratio significantly influences the bandwidth of regions of critical excitation frequencies for in-plane dynamic instability of arches. The critical frequencies of the periodic load and their bandwidth increase with a decrease of the rise–span ratio of the arch, whereas the corresponding amplitude of the periodic load decreases at the same time. It is also found that the central concentrated weight influences in-plane dynamic instability of arches significantly. As the weight increases, the critical frequencies of excitation and their bandwidth for in-plane dynamic instability of arches decreases, whereas the corresponding amplitude of excitation increases.

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5

Sabale, Aditya, e K. V. Nagendra Gopal. "Nonlinear In-Plane Stability of Deep Parabolic Arches Using Geometrically Exact Beam Theory". International Journal of Structural Stability and Dynamics 18, n. 01 (gennaio 2018): 1850006. http://dx.doi.org/10.1142/s0219455418500062.

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In this paper, we investigate the in-plane stability and post-buckling response of deep parabolic arches with high slenderness ratios subjected to a concentrated load on the apex, using the finite element implementation of a geometrically exact rod model and the cylindrical version of the arc-length continuation method enabled with pivot-monitored branch-switching. The rod model used here includes geometrically exact kinematics of the cross-section, exact kinetics, and a linear elastic constitutive law; and advantageously employs quaternion parameters to treat the cross-sectional rotations and to compute the exponential map in the configurational update of rotations. The evolution of the Frenet frame along the centroidal curve is used to determine the initial curvature of the rod. Three sets of boundary conditions, i.e. fixed–fixed (FF), fixed–pinned (FP) and pinned–pinned (PP), are considered, and arches with a wide range of rise-to-span ratios are analyzed for each set. Complete post-buckling response has been derived for all cases. The results reveal that although all the PP arches and all the FF arches (with the exception of FF arches with rise-to-span ratio less than 0.3) considered in this study buckle via bifurcation, the nature of stability of the different solution branches in the post-buckling regime differs from case to case. All FP slender parabolic arches exhibit limit-point buckling, again with several markedly different post-buckling behaviors. Also, some arches in the FF and PP case are shown to exhibit a clear bistable behavior in the post-buckled state.

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6

Song, Xi, e Shi Rong Li. "Nonlinear Stability of Fixed-Fixed FGM Arches Subjected to Mechanical and Thermal Loads". Advanced Materials Research 33-37 (marzo 2008): 699–706. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.699.

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Based on Kirchhoff’s assumption of straight normal line of beams and considering the effects of the axial elongation, the initial curvature and the stretching-bending coupling on the arch deformation, geometrically nonlinear governing equations of functionally graded arch subjected to mechanical and thermal loads are derived. In the analysis, it is assumed that the material properties of the arch vary through the thickness as a power function. As a numerical example, the critical buckling load and the corresponding mode shapes of a semicircle arch, with both of the ends fixed, subjected to normally uniform distributed follower force is obtained by the shooting method. The effects of the parameters of material gradient on the critical loads and the deformation of the structure are examined in detail. Equilibrium configurations for different values of the load or temperature rise are plotted. Analysis and numerical results show that the behavior of buckling of the arch is of bifurcation and the buckling modes corresponding to minimum buckling load is asymmetric. In other words, bifurcation buckling occurs prior to the snap-through buckling.

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7

Pi, Yong-Lin, e Mark Andrew Bradford. "Nonlinear elastic analysis and buckling of pinned–fixed arches". International Journal of Mechanical Sciences 68 (marzo 2013): 212–23. http://dx.doi.org/10.1016/j.ijmecsci.2013.01.018.

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8

Cai, JianGuo, Jian Feng, Yao Chen e LiFeng Huang. "In-plane elastic stability of fixed parabolic shallow arches". Science in China Series E: Technological Sciences 52, n. 3 (24 febbraio 2009): 596–602. http://dx.doi.org/10.1007/s11431-009-0057-9.

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9

Albati, Mohammed, Riham Showlag, Alaa Akili, Halah Hanafiyyah, Hanadi AlNashri, Waad Aladwani, Ghaida Alfarsi, Mashael Alharbi e Abdulrahman Almutairi. "Space maintainers application, indication and complications". International Journal Of Community Medicine And Public Health 5, n. 11 (25 ottobre 2018): 4970. http://dx.doi.org/10.18203/2394-6040.ijcmph20184251.

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Dental space maintenance is essential in cases of premature loss of primary dentition to prevent malposition, supra-eruption, impaction, or crowding of the developing permanent teeth. Many types of space maintainers are available and each type is specifically designated for particular indications. Space maintainers have many classifications according to their design, their fixation pattern, their position, and their site. They can be fixed, semi-fixed, or removable, with or without loops, wires, and/or bands, unilateral or bilateral, and are placed on mandibular or maxillary arches. The most commonly used space maintainers are loops and bands, fixed lingual arches, Nance appliances, and transpalatal arches. Though space maintainers are generally safe, several complications are sometimes inevitable. This article will review the different types of space maintainers and their application and will discuss their indications and potential complications.

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10

Bradford, M. A., e Y. L. Pi. "Flexural–torsional buckling of fixed steel arches under uniform bending". Journal of Constructional Steel Research 62, n. 1-2 (gennaio 2006): 20–26. http://dx.doi.org/10.1016/j.jcsr.2005.02.012.

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11

Tebo, Emmanuel-Peters Teke, Leonard Masu e Patrick Nziu. "Effects of Factors That Influence Out-of-Plane Lateral-Torsional Buckling on Freestanding Circular Arches". Journal of Engineering 2020 (1 maggio 2020): 1–12. http://dx.doi.org/10.1155/2020/4892070.

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This paper presents the effects of the several factors that influence lateral-torsional buckling on freestanding circular arches. The studied factors that attribute to the effects of lateral-torsional buckling include cross section type, included angle, slender ratio, imperfection, loading, and boundary conditions. From the reviewed studies, the misrepresentation of these factors to a certain extent may yield inaccurate results. Several studies and design codes have proposed different solutions to account for these factors in designs against lateral-torsional buckling for some structural elements. However, there were no studies reported on the out-of-plane lateral-torsional buckling of fixed circular arches made of structural aluminum channel sections subjected to central concentrated load. Therefore, there is a need for further research on the lateral-torsional buckling real behavior of fixed circular arches of structural aluminum channels.

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12

Song, Xiaochun, Hanwen Lu, Airong Liu e Yonghui Huang. "In-Plane Instability of Fixed Arches under Linear Temperature Gradient Field and Uniformly Distributed Radial Load". Mathematical Problems in Engineering 2019 (18 agosto 2019): 1–12. http://dx.doi.org/10.1155/2019/5938030.

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This paper focuses on an in-plane instability analysis of fixed arches under a linear temperature gradient field and a uniformly distributed radial load, which has not been reported in the literature. Combining a linear temperature gradient field and uniformly distributed radial load leads to the changes in axial expansion and curvature of arches, producing the complex in-plane nonuniform bending moment and axial force. Therefore, it is necessary to explore the in-plane thermoelastic mechanism behavior of fixed arches under a linear temperature gradient field and a uniformly distributed radial load in the in-plane instability analysis. Based on the energy method and the exact solutions of internal force before instability, the analytical solutions of the critical uniformly distributed radial load considering the linear temperature gradient field associated with in-plane thermoelastic instability of arches are derived. Comparisons show that agreements of analytical solutions against FE (finite element) results are excellent. Influences of various factors on in-plane instability are also studied. It is found that the change of the linear temperature gradient field has significant influences on the in-plane instability load. The in-plane instability load decreases as the temperature differential of the linear temperature gradient field increases.

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13

Saneja, Ritu, Atul Bhatnagar, Nancy Raj e Pavan Dubey. "Semiprecision attachment: a connecting link between the removable and fixed prosthesis". BMJ Case Reports 13, n. 8 (agosto 2020): e233744. http://dx.doi.org/10.1136/bcr-2019-233744.

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Oral rehabilitation of partially edentulous arches requires careful treatment planning before any prosthodontic intervention. The connection of the metal framework of fixed (fixed dental prosthesis (FPD)) and removable partial denture using adhesive attachments is a good alternative prosthetic option when solely fixed prosthesis (FPD or implant) cannot be used due to anatomical limitation. Attachments are the tiny interlocking devices that act as a hybrid link to join removable prosthesis to the abutment and direct the masticatory forces along the long axis of the abutment. This joint acts as a non-rigid stress breaker, which helps in distributing the occlusal load. Precision and semiprecision attachment have always been bordered by an aura of mystery due to technique sensitive procedure and lack of knowledge. The following case describes a combined contemporary and conventional approach and treatment sequence with the use of attachments for the rehabilitation of partially edentulous arches.

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14

Parajuli, Umesh, Manish Bajracharya, Manju Pandey, Ima Gurung e Sapna Laxmi Tuladhar. "Assessment of arch width changes in Class I and Class II Division 1 patients treated with fixed orthodontics". Journal of Gandaki Medical College-Nepal 14, n. 1 (13 giugno 2021): 3–7. http://dx.doi.org/10.3126/jgmcn.v14i1.37023.

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Background: The orthodontic treatment should aim to maintain the inter-canine and inter-molar width to that of the pre-treatment values. The study was conducted with objective to evaluate arch width changes in Class I and Class II patients treated with fixed orthodontics. Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed. A paired sample t-test was used to evaluate the treatment changes within each group. Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post treatment Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed. A paired sample t-test was used to evaluate the treatment changes within each group. Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post-treatment inter-molar width in both arches with significant decrease in the maxillary inter-molar width. Conclusion: There was increase in inter-canine width in both Class I extraction group and Class II Div 1 maxillary extraction group with decrease in inter-molar width in both the groups.

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15

Lu, Hanwen, Airong Liu, Yong-Lin Pi, Mark Andrew Bradford, Jiyang Fu e Yonhui Huang. "Localized loading and nonlinear instability and post-instability of fixed arches". Thin-Walled Structures 131 (ottobre 2018): 165–78. http://dx.doi.org/10.1016/j.tws.2018.06.019.

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16

Pi, Yong-Lin, e Mark Andrew Bradford. "Out-of-Plane Strength Design of Fixed Steel I-Section Arches". Journal of Structural Engineering 131, n. 4 (aprile 2005): 560–68. http://dx.doi.org/10.1061/(asce)0733-9445(2005)131:4(560).

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17

Pi, Yong-Lin, e Mark A. Bradford. "In-plane strength and design of fixed steel I-section arches". Engineering Structures 26, n. 3 (febbraio 2004): 291–301. http://dx.doi.org/10.1016/j.engstruct.2003.09.011.

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18

Pi, Yong-Lin, Mark Andrew Bradford e Airong Liu. "Nonlinear Equilibrium and Buckling of Fixed Shallow Arches Subjected to an Arbitrary Radial Concentrated Load". International Journal of Structural Stability and Dynamics 17, n. 08 (ottobre 2017): 1750082. http://dx.doi.org/10.1142/s0219455417500821.

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This paper is concerned with an analytical study of the nonlinear in-plane equilibrium and buckling of fixed shallow circular arches that are subjected to an arbitrary radial concentrated load. The structural behavior of an arch under an arbitrary radial concentrated load is quite different from that of an arch under a central concentrated load. It is shown that a fixed arch under an arbitrary radial concentrated load can buckle in a limit point instability mode, but cannot buckle in a bifurcation mode, which is different from that of a fixed arch under a central concentrated load that can buckle in a bifurcation mode or in a limit point instability mode. Analytical solutions for the nonlinear equilibrium path and limit point buckling load of shallow circular arches under an arbitrary radial concentrated load are derived. It is found that the load position influences the buckling load significantly and the influence is much related to the modified slenderness of the arch defined in the paper. It is also found that when the modified slenderness of an arch is smaller than a specific value, the arch has no typical buckling behavior. The analytical solution for the relationship of the specific modified slenderness with the load position is also derived. Comparisons with finite element (FE) results show that the analytical solutions can accurately predict the nonlinear equilibrium and buckling load of shallow fixed arches under an arbitrary radial concentrated load.

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19

Almeida, Kélei Cristina de Mathias, Ricardo Fabris Paulin, Taísa Barnabé Raveli, Dirceu Barnabé Raveli e Ary Santos-Pinto. "Two-Step Extraction of the Lower First Molar for Class III Treatment in Adult Patient". Case Reports in Dentistry 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/1580313.

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The aim of this article is to describe a case report of Class III malocclusion treatment with lower first molar extraction. The 27-year-old Caucasian male patient presented a symmetric face with a straight profile, hyperdivergent growth pattern, molar and cuspid Class III relation, and an anterior crossbite as well as a mild crowding on cuspids area, in both upper and lower arches and a tendency to posterior crossbite. The treatment was performed by the use of Haas expansion appliance followed by an initial alignment and leveling of the upper and lower arches with a fixed edgewise appliance, extraction of lower teeth aiming the correction of the incisors proclination and end the treatment with a Class I molar relationship. It resulted in a significant change in the patient’s profile, dentoalveolar Class III correction, upper arch expansion, leveling and alignment of the upper and lower arches, and improvement of tipping of the upper and lowers incisors. In cases of a dentoalveolar compensation in well positioned bone bases the treatment with fixed appliances is an alternative and extraction of lower teeth is considered.

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20

Kiss, László. "Stability of pinned-rotationally restrained arches". Theoretical and Applied Mechanics, n. 00 (2020): 10. http://dx.doi.org/10.2298/tam200402010k.

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The article aims to find the buckling loads for pinned-rotationally restrained shallow circular arches in terms of the rotational end stiffness, geometry and material distribution. The loading is a concentrated vertical force placed at the crown. A geometrically nonlinear model is presented which relates not only the axial force but also the bending moment to the membrane strain. The nonlinear load-strain relationship is established between the strain and load parameters. This equation is then solved and evaluated analytically. It turns out that the stiffness of the end-restraint has, in general, a significant effect on the lowest buckling load. At the same time, some geometries are not affected by this. As the stiffness becomes zero, the arch is pinned-pinned and as the stiffness tends to infinity, the arch behaves as if it were pinned-fixed and has the best load-bearing abilities.

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21

Ho, K. K., e W. J. S. Kerr. "Arch Dimensional Changes during and following Fixed Appliance Therapy". British Journal of Orthodontics 14, n. 4 (novembre 1987): 293–97. http://dx.doi.org/10.1179/bjo.14.4.293.

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A retrospective investigation of the study casts of 23 subjects, treated by Fixed Appliances and the extraction of four premolars, using the Reflex Metrograph showed a general trend for a reduction in mean arch dimensions both during and following treatment. An exception was demonstrated in the inter-canine width, which for both arches showed slight expansion during treatment, although this was lost post-treatment in the mandibular arch while it was maintained in some cases in the maxillary arch.

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22

MIRMIRAN, AMIR, AMDE M. AMDE e ZEFANG XU. "ELASTO-PLASTIC BUCKLING OF PRESTRESSED ARCHES". International Journal of Structural Stability and Dynamics 02, n. 03 (settembre 2002): 295–313. http://dx.doi.org/10.1142/s0219455402000580.

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Intentional buckling as a fabrication technique for arch frameworks results in prestrains at every section of the arch, which in turn affect its strength and stability. A nonlinear corotational straight beam element with elastic, linear strain hardening material has been developed to study the elasto-plastic buckling of prestressed arches. The study indicates that for prestressed arches there is an interdependence between the slenderness and steepness ratios of the arch with the ratio of prestresses to the yield strength of the material, all of which control the magnitude and shape of buckling mode. While steeper arches are generally more stable in their elastic range, the effect of steepness ratio is reduced as the prestress exceeds 55% of the yield strength. Effects of loading and support conditions have also been considered. Although fixed supports result in more stable arches, their effectiveness depends on the steepness ratio and the level of prestresses. Finally, the effect of strain hardening on the plastic buckling of the arch is more pronounced for lower values of the plastic tangent modulus.

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23

Dou, Chao, Yan-Lin Guo, Yong-Lin Pi, Si-Yuan Zhao e Mark Andrew Bradford. "Effects of shape functions on flexural–torsional buckling of fixed circular arches". Engineering Structures 59 (febbraio 2014): 238–47. http://dx.doi.org/10.1016/j.engstruct.2013.10.028.

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24

Castellano, Anna, Aguinaldo Fraddosio, Jacopo Scacco, Gabriele Milani e Mario Daniele Piccioni. "Dynamic Response of FRCM Reinforced Masonry Arches". Key Engineering Materials 817 (agosto 2019): 285–92. http://dx.doi.org/10.4028/www.scientific.net/kem.817.285.

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The problem of the dynamic behavior of masonry arches and vaults has gained increasing interest in recent years, since the key role of these structural elements in the masonry constructions, especially of historic interest. Despite this, the literature still lacks a sufficiently large number of contributions on this important subject, and this deficiency is even more marked for the case of reinforced masonry. In this context, the present paper shows and discusses some preliminary experimental results on full-scale dynamic tests on unreinforced and GFRCM-reinforced Apulian tuff masonry arches. The experiments have been performed by using a test bench appositely designed and built; the dynamic excitation consisted of a harmonic base motion with fixed amplitude and increasing frequency. The acceleration in suitable points of the arches, the base shear and the base motion have been continuously monitored during the tests.

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Claro, Cristiane Aparecida de Assis, Jorge Abrão e Silvia Augusta Braga Reis. "Forces in stainless steel, TiMolium® and TMA® intrusion arches, with different bending magnitudes". Brazilian Oral Research 21, n. 2 (giugno 2007): 140–45. http://dx.doi.org/10.1590/s1806-83242007000200008.

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The present study compared forces in stainless steel, TiMolium® and TMA®, V-bend intrusion arches with different magnitudes of flexion. The sample consisted of rectangular-section wires, caliber .017" x .025", with ten arches of each alloy. All V-bends were made 48 mm from the midline, using the same phantom upper jaw, maintaining the same distance between the tubes fixed to the molars and the midline. Loads necessary to deflect the arches by 5, 10, 15 and 20 mm were measured by means of an Instron dynamometer with a 1 kgf load cell. Calculations for sample size confirmed the suitability of using 10 arches of each alloy. Variance tests (ANOVA) of one factor and three levels, complemented by the Tukey test for multiple comparisons, identified that TMA® intrusion arches required a smaller quantity of load in relation to conventional steel and TiMolium® at all levels of flexion. Furthermore, TiMolium® presented intermediary characteristics between steel and TMA®, and in all alloys increase in distance entailed a significant increase in force between all registered values, and that the increase in load necessary to deflect the arches at the intervals tended to decrease from first to last interval, these differences being more significant in steel, less in TiMolium® and practically non-existent in TMA®.

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Yang, Zhicheng, Jiamian Xu, Hanwen Lu, Jiangen Lv, Airong Liu e Jiyang Fu. "Multiple Equilibria and Buckling of Functionally Graded Graphene Nanoplatelet-Reinforced Composite Arches with Pinned-Fixed End". Crystals 10, n. 11 (5 novembre 2020): 1003. http://dx.doi.org/10.3390/cryst10111003.

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This paper presents an analytical study on the multiple equilibria and buckling of pinned-fixed functionally graded graphene nanoplatelet-reinforced composite (FG-GPLRC) arches under central point load. It is assumed that graphene nanoplatelets (GPLs) in each GPLRC layer are uniformly distributed and randomly oriented with its concentration varying layer-wise along the thickness direction. The Halpin–Tsai micromechanics-based model is used to estimate the effective elastic modulus of GPLRC. The non-linear equilibrium path and buckling load of the pinned-fixed FG-GPLRC arch are subsequently derived by employing the principle of virtual work. The effects of GPLs distribution, weight fraction, size and geometry on the buckling load are examined comprehensively. It is found that the buckling performances of FG-GPLRC arches can be significantly improved by using GPLs as reinforcing nanofillers. It is also found that the non-linear equilibrium path of the pinned-fixed FG-GPLRC arch have multiple limit points and non-linear equilibrium branches when the arch is with a special geometric parameter.

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Hajrasi, Manar K., Ahmad A. Al-Fraidi, Abdulkarim A. Hatrom e Ali H. Hassan. "Nonextraction Management of Severely Malaligned and Constricted Upper Arch". Case Reports in Dentistry 2020 (25 agosto 2020): 1–9. http://dx.doi.org/10.1155/2020/8836061.

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This case report presents the treatment of a 12-year-old female with a severely crowded upper arch, severely palatally displaced upper premolars and lateral incisors, large midline diastema, lower midline deviation to the right, class III dental and skeletal relationships due to mild maxillary deficiency, retroclined lower incisors, straight profile, and retrusive lips. A nonextraction treatment approach is described, in which the upper and lower arches were expanded to their original three dimensions using a trihelix expander, a lip bumper appliance, and a fixed orthodontic appliance. Retention was also planned in accordance with the original malocclusion, which inclued a full-time-wear upper wraparound retainer, upper and lower anterior fixed lingual retainers, upper frenectomy, and fibrotomy for rotated teeth. Conclusion. Severe malalignment of teeth does not necessarily require extraction treatment. Gaining space is an art that requires a proper assessment of the anteroposterior and transverse dimensions of alveolar arches, lip prominence, and postorthodontic stability.

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Huh, Yoon-Hyuk, Yang-Jin Yi, Min-Jung Kwon, Young-Kyun Kim e Min-Sang Cha. "Clinical outcomes of implant supported fixed-hybrid prostheses in the fully edentulous arches". Journal of Korean Academy of Prosthodontics 51, n. 3 (2013): 183. http://dx.doi.org/10.4047/jkap.2013.51.3.183.

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29

YABUKI, Tetsuya, Le-Wu LU e Shigeru KURANISHI. "An ultimate strength design aid for fixed-end steel arches under vertical loads." Doboku Gakkai Ronbunshu, n. 380 (1987): 141–49. http://dx.doi.org/10.2208/jscej.1987.380_141.

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30

YABUKI, Tetsuya, e Shigeru KURANISHI. "Ultimate strength design provisions for fixed-end steel arches with variable cross-sections." Doboku Gakkai Ronbunshu, n. 392 (1988): 103–9. http://dx.doi.org/10.2208/jscej.1988.392_103.

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31

Wu, Xinrong, Changyong Liu, Wei Wang e Yuyin Wang. "In-Plane Strength and Design of Fixed Concrete-Filled Steel Tubular Parabolic Arches". Journal of Bridge Engineering 20, n. 12 (dicembre 2015): 04015016. http://dx.doi.org/10.1061/(asce)be.1943-5592.0000766.

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32

Pi, Yong-Lin, e Mark Andrew Bradford. "In-plane thermoelastic behaviour and buckling of pin-ended and fixed circular arches". Engineering Structures 32, n. 1 (gennaio 2010): 250–60. http://dx.doi.org/10.1016/j.engstruct.2009.09.012.

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33

Udupi, Suman, e Pushpa Gowda. "Patterns of Arterial Arcades of the Superficial Palmar Arch: A Study In Embalmed Cadaver Palms". International Journal of Anatomy and Research 9, n. 3.3 (5 settembre 2021): 8097–102. http://dx.doi.org/10.16965/ijar.2021.156.

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Abstract (sommario):

Background: The complex and variable pattern of the arterial arcades of the palm form an interesting area of study anatomically and surgically. In the present study arches were classified into complete and incomplete types, the complete type being the most prominent in 88.6% of the palms. Among the complete type, arch formed by ulnar artery alone supplying the thumb and index finger was found in majority of the specimens (50%). The classical or standard superficial palmar arch formed by the superficial palmar branch of radial and ulnar arteries was found in only 28.5%. Different patterns of the arterial arcades of the superficial palmar arch are normally encountered during routine anatomical dissections of the palm which needs to be emphasized and highlighted for a desired surgical out come during microvascular reconstructive surgeries of the palm and during radial artery cannulation. Context: With technological advancements in microsurgical procedures of the hand, fields of anatomical interest like the classification of arterial arcades of the palm, now becomes essential for operating vascular surgeons for a desired surgical outcome Purpose of the study: The present study was taken up to analyze and document varying patterns of the arterial arcades of the superficial palmar arch. Methods and Material: the study was conducted by dissecting 70 randomly obtained formalin fixed cadaver palms. Results: In the present study arches were classified into complete and incomplete types, the complete type being the most prominent in 88.6% of the palms. Among the complete type, arch formed by ulnar artery alone supplying the thumb and index finger was found in majority of the specimens (50%). The classical or standard superficial palmar arch formed by the superficial palmar branch of radial and ulnar arteries was found in only 28.5%. Out of the 70 hands, incomplete arches were found only in 8 hands with an incidence of 11.4%. Conclusion: Knowledge of arterial pattern of the hand is very important to vascular and reconstructive surgeons for effective treatment of injuries of the hand. Such a knowledge of the disposition of the arterial arcades of the palm also enables cardio-vascular surgeons to plan and modify surgical procedures such as radial artery harvesting, cannulation and in preventing the ischemia of hands in such procedures. KEY WORDS: Superficial palmar arch, Arterial arcades, Complete arch, Incomplete arch.

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34

Teke Tebo, Emmanuel-Peters, Leonard Masu e Patrick Nziu. "Inelastic Lateral-Torsional Buckling Load on Fixed Circular Channels Arches Under Transverse Point Load". International Journal of Engineering Research and Technology 13, n. 10 (31 ottobre 2020): 2851. http://dx.doi.org/10.37624/ijert/13.10.2020.2851-2863.

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35

Teke Tebo, Emmanuel-Peters, Leonard Masu e Patrick Nziu. "Elastic Lateral-Torsional Buckling Load on Circular Fixed Channels Arches Under Transverse Point Load". International Journal of Engineering Research and Technology 13, n. 10 (31 ottobre 2020): 2870. http://dx.doi.org/10.37624/ijert/13.10.2020.2870-2883.

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36

Lu, Hanwen, Lulu Liu, Airong Liu, Yong-Lin Pi, Mark Andrew Bradford e Yonghui Huang. "Effects of movement and rotation of supports on nonlinear instability of fixed shallow arches". Thin-Walled Structures 155 (ottobre 2020): 106909. http://dx.doi.org/10.1016/j.tws.2020.106909.

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37

Romeo, Eugenio, Diego Lops, Emilio Margutti, Marco Ghisolfi, Matteo Chiapasco e Giorgio Vogel. "Implant-supported fixed cantilever prostheses in partially edentulous arches. A seven-year prospective study". Clinical Oral Implants Research 14, n. 3 (maggio 2003): 303–11. http://dx.doi.org/10.1034/j.1600-0501.2003.120905.x.

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38

Liu, Airong, Zhicheng Yang, Mark Andrew Bradford e Yong-Lin Pi. "Nonlinear Dynamic Buckling of Fixed Shallow Arches under an Arbitrary Step Radial Point Load". Journal of Engineering Mechanics 144, n. 4 (aprile 2018): 04018012. http://dx.doi.org/10.1061/(asce)em.1943-7889.0001425.

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39

Guo, Yan-Lin, Si-Yuan Zhao, Yong-Lin Pi, Mark Andrew Bradford e Chao Dou. "An experimental study on out-of-plane inelastic buckling strength of fixed steel arches". Engineering Structures 98 (settembre 2015): 118–27. http://dx.doi.org/10.1016/j.engstruct.2015.04.029.

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40

Pi, Y. L., e M. A. Bradford. "Effects of prebuckling deformations on the elastic flexural-torsional buckling of laterally fixed arches". International Journal of Mechanical Sciences 46, n. 2 (febbraio 2004): 321–42. http://dx.doi.org/10.1016/j.ijmecsci.2004.02.012.

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41

Pi, Yong-Lin, e Mark Andrew Bradford. "Nonlinear dynamic buckling of pinned–fixed shallow arches under a sudden central concentrated load". Nonlinear Dynamics 73, n. 3 (27 marzo 2013): 1289–306. http://dx.doi.org/10.1007/s11071-013-0863-2.

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42

Mahoorkar, Sudhindra Sudhakar, V. Somwanshi Adesh e Manju George. "Rehabilitation of Edentulous Arches with Fixed Prosthesis Supported by Tilted Implants: A Systematic Review". International Journal of Prosthodontics and Restorative Dentistry 11, n. 1 (12 agosto 2021): 33–53. http://dx.doi.org/10.5005/jp-journals-10019-1299.

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43

Kochar, Gagan Deep. "Management of Tooth Size Arch Perimeter Discrepancy: An Indian Board of Orthodontics Case Report". Journal of Indian Orthodontic Society 55, n. 3 (luglio 2021): 310–14. http://dx.doi.org/10.1177/03015742211026217.

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Abstract (sommario):

This case was submitted to the board under Category I for the Indian Board of Orthodontics examination. This communication describes the management of a female patient who presented with severe crowding in both upper and lower arches. Comprehensive fixed orthodontic mechanotherapy including extractions of all first premolars was carried out. Stable harmonious occlusion was achieved on long-term follow-up.

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44

Costea, Radu Cătălin, Viorel Ștefan Perieanu, Claudia-Camelia Burcea, Mihai Burlibaşa, Mihaela Chirilă, Narcis Marcov, Gabriela Tănase et al. "Practical Aspects Regarding Magnetic Retained Overdenture". Acta Medica Transilvanica 26, n. 2 (1 giugno 2021): 62–66. http://dx.doi.org/10.2478/amtsb-2021-0037.

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Abstract (sommario):

Abstract Overdenture is a type of treatment suitable for subtotal and complete edentulous patients and is characterized by making a total prosthesis, with the mucosal face embedding remaining teeth (remaining roots) or dental implants. In this material we will try to present some practical aspects, regarding retained overdenture with magnetic systems fixed in the remaining roots at the level of the dental arches.

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45

Battagel, Joanna M., A. S. Johal e V. P. Crow. "The Assessment of Crowding without the Need to Record Arch Perimeter. Part II: Crowded and Irregular Arches". British Journal of Orthodontics 23, n. 3 (agosto 1996): 229–36. http://dx.doi.org/10.1179/bjo.23.3.229.

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Abstract (sommario):

A mathematically determined technique which seemed to be valid for the calculation of crowding and spacing in arches with acceptable alignment, was tested on a series of arches with varying degrees of crowding and irregularity. Upper and lower study casts of 30 individuals with sufficient malalignment and crowding to warrant orthodontic treatment with fixed appliances were examined. Models were measured by three operators, using a reflex microscope interfaced to an IBM compatible PC and a customized calculation program. The degree ofcrowdmg was compared with a ‘clinical’ assessment of each arch, in which the irregularity was measured directly using a steel ruler. Both the computer calculated and clinical values varied between observers, but the agreement between observers was better using the reflex microscope. Correlation coefficients ranged from 0·92 to 0·96 for the reflex microscope, and between 0·86 and 0·91 for the clinical assessment. Inter-observer agreement for the three operators was high: 0·93 for the reflex microscope and 0·87 where a ruler was used. This suggests that the computer program used to calculate the crowding was valid for the crowded arches under consideration.

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46

Sfondrini, Maria Francesca, Simone Gallo, Benedetta Turcato, Mona A. Montasser, Nehal Fouad Albelasy, Pekka K. Vallittu, Paola Gandini e Andrea Scribante. "Universal Adhesive for Fixed Retainer Bonding: In Vitro Evaluation and Randomized Clinical Trial". Materials 14, n. 6 (10 marzo 2021): 1341. http://dx.doi.org/10.3390/ma14061341.

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Abstract (sommario):

This study aims to assess the efficacy of a universal adhesive (Scotchbond Universal, 3M ESPE) (SB) in total-etch mode, compared to a traditional orthodontic primer (Transbond XT Primer, 3M ESPE) (XT Primer), to perform bonding of orthodontic fixed retainers along with the Transbond XT Light Cure Adhesive Paste (3M ESPE). For the in vitro study, a round section wire (Ortosmail Krugg) was bonded using XT Primer for 20 bovine incisors (Group 1) and SB for other 20 (Group 2). Samples were debonded in a universal testing machine applying a tangential force to specimens (crosshead speed of 1 millimeter per minute). Shear bond strength (SBS) and adhesive remnant index (ARI) scores were calculated. For the in vivo study, 100 patients needing upper and lower canine-to-canine fixed retainers after orthodontic treatment were randomly assigned to two groups of 50 participants each, i.e., group 1 (retainer bonding with XT Primer) and group 2 (retainer bonding with SB). Over two years, examinations were carried out monthly, and detachments were registered by considering the teeth and arches affected. In vitro, no statistically significant differences in SBS and ARI scores were demonstrated between the two groups, both showing a mean bond strength of about 12 MPa and major frequency of ARI “2” (>50% remnant adhesive on the enamel). Conversely, a significantly lower failure rate over 2 years was assessed clinically for group 2 in both arches. Independently of the adhesive and arch, incisors reported a significantly higher failure rate than canines. Scotchbond Universal used in total-etch mode could be a valid alternative to the traditional orthodontic Transbond XT Primer.

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47

Mihali, Sorin Gheorghe, e Emanuel Adrian Bratu. "Clinical Outcomes in Implant-Supported Full-Arch Fixed Prosthesis Utilizing Pressed Composite Restorations". Materiale Plastice 54, n. 4 (30 dicembre 2017): 795–99. http://dx.doi.org/10.37358/mp.17.4.4948.

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Abstract (sommario):

The author wants to evaluate the clinical advantages and limitations of the composite pressed on metal framework for full-arch implant-supported fixed prosthesis in comparing with dental ceramic restorations. A total of thirty-two edentulous arches were restored. All complications were recorded at each follow-up visit up to 1 year after insertion. No complications were reported on pressed composite restoration. Complications were found in the ceramic restorations like chipping or fracture of the ceramic veneer. The composite pressed restorations are a treatment option for full arch restorations over implants, showing a better success rate in the present study in comparing with ceramic restorations.

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48

Yang, Zhicheng, Airong Liu, Yong-Lin Pi, Jiyang Fu e Zhongkang Gao. "Nonlinear dynamic buckling of fixed shallow arches under impact loading: An analytical and experimental study". Journal of Sound and Vibration 487 (novembre 2020): 115622. http://dx.doi.org/10.1016/j.jsv.2020.115622.

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49

Pi, Yong-Lin, Mark Andrew Bradford e Weilian Qu. "Energy approach for dynamic buckling of shallow fixed arches under step loading with infinite duration". Structural Engineering and Mechanics 35, n. 5 (30 luglio 2010): 555–70. http://dx.doi.org/10.12989/sem.2010.35.5.555.

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50

Wei, Jiangang, Qingxiong Wu, Baochun Chen e Ton-Lo Wang. "Equivalent Beam-Column Method to Estimate In-Plane Critical Loads of Parabolic Fixed Steel Arches". Journal of Bridge Engineering 14, n. 5 (settembre 2009): 346–54. http://dx.doi.org/10.1061/(asce)1084-0702(2009)14:5(346).

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