Correction of persistent crowding in the lower anterior region: A case report

Aim: This case report demonstrates the application of piezocision in correcting persistent crowding in the lower anterior region of dental arch. Methodology: A female aged 14 years and 3 months presented to the Selcuk University Department of Orthodontics due to aesthetic complaints. Clinical and radiological examination revealed crowding in the upper and lower dental arches as well as skeletal and dental Class I malocclusion. First, bonding and arch wire were applied to the patient’s upper jaw. The patient then had check-up appointments at 4-week intervals. In the second session, bonding was applied to the lower jaw. As the leveling was completed in the upper jaw, thicker arch wires were used. However, 4 months after the bonding of the lower anterior region, leveling did not occur. Consequently, piezocision was applied to the lower anterior region. Then, two applications of 0.014'' and 0.016'' NiTi wire were carried out, respectively. After the completion of the leveling, intrusion was provided with the utility arch placed on the lower incisor brackets. Orthodontic treatment was concluded with the use of NiTi and steel angle wires. Conclusion: Efficient leveling was achieved in the lower anterior region with piezocision applications. How to cite this article: Cime Akbaydogan L, Baka ZM, Uulusoy Mutluol E. Correction of persistent crowding in the lower anterior region: A case report. Int Dent Res 2021;11(Suppl.1):303-7. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.45 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Failure Modes Of Cold Formed Steel Angle Sections

Tension members consisting of single and double angles, single channels and similar sections are frequently used for lateral bracing and as truss elements. Such members normally have eccentric connections which results in bending of tension member. It is often permitted, by current design specifications, to neglect this eccentricity in the design of the member. The present study is focus on mode of failure on cold formed steel angle. This analysis carries single angles and double angles sections of 2mm under plain (without Lipped) and with Lipped conditions subjected to tension. Analyses were carried out for thirty-six numbers of angle sections under condition such as double angle were connected same side to gusset plate and connected to opposite side. Figure shows connection failure and mode of failure. Local buckling, global buckling, tearing failure, net section failure, and block shear failure.

Analysis Of Light Gauge Steel By Using Fem Subjected To Tension Load

The effective sectional area concept was adopted to conduct the analysis of cold-formed Tension members. ANSYS software was utilized to simulate the behavior of cold-formed steel angle under tension load. The paper describes the results from a finite element investigation into the load capacity tension members of single angle sections of 1.5,.1.6,2 3,4 mm and double angles sections of 2mm under plain (without Lipped) and with Lipped conditions subjected to tension. Numerical investigations were carried out using finite element software ANSYS. In order to simulate the experimental behavior using the analytical model, material non-linearity’s and geometric nonlinearity’s were incorporated. The ultimate strength for cross – sectional dimensions with varying eccentricity loads under tension loading conditions was achieved through the ANSYS 15.0 workbench. In the numerical investigation, 180 specimens were modeled on tensioning elements attached to bolts. To find equivalent stress, equivalent elastic strain and total deformation of single and double-angle sections were investigated.