Objective: To compare the forces, moments and moment/ force (M/F) ratio and load deflection rate of T-loop, keyhole loop, teardrop loop and mushroom loop with the finite element method (FEM).
Materials and methods:FEM was used to compare 3D models of closing loops in rectangular (0.017 × 0.025 inch) beta titanium wire. The T-loop, mushroom loop, keyhole loop and teardrop loop were 7 mm in height. The forces, the moments and the M/F ratios at each tooth node were recorded with an activation of 2 mm.
Results:The highest force and moments was produced by the keyhole loop and the lowest force was produced by the mushroom loop.
Conclusion:All the four retraction loops exerted the greatest force levels at the molar node. The maximum value for M/F ratio is seen at the central incisor followed by lateral incisor, molar and canine node. The keyhole loop demonstrated the least load deflection rate making it the most efficient design.
Objective: The aim of this study was to assess the reliability and accuracy of several types of lateral cephalometric attributes commonly used: Angular measurements, linear measurements, and ratio when using digital cephalometric software (Nemoceph) with manual tracing method. Materials and methods: Sample size consisted of 26 lateral cephalometric radiographs. All cephalograms were subjected to both manual and digital cephalometric analysis by the same examiner. Digital analyses were performed on Nemotec digital imaging software. Cephalograms were assessed for a total of 17 cephalometric attributes. The results were assessed using Student's t-test. Results: Six out of 17 measurements, i.e., sella, nasion, B point, ANB, incisor mandibular plane angle, mandibular plane angle, L1-NB, and Jarabak ratio, showed statistically significant difference between the manual and digital methods. Conclusion: Digital measurements obtained with Nemotec digital imaging software were found to be comparable to the manual method for most of the variables used in clinical practice.
Introduction: An accurate evaluation of sagittal jaw relationship is important in orthodontic diagnosis and treatment planning. Numerous angular and linear measurements have been incorporated to assess anteroposterior jaw discrepancy between maxilla and mandible so as to reach the correct diagnosis. So the purpose of this study is to compare Beta angle and YEN angle used to measure anteroposterior dysplasia and to find which is the most reliable between them.
Materials and methods:The sample comprised 26 pretreatment lateral cephalograms of Skeletal class II patients.
Results:Descriptive analysis was performed and highly significant values were found with both Beta angle and YEN angle.Conclusion: Beta and YEN angles are significant ones to assess the sagittal jaw relationship between maxilla and mandible.
Aim:The present study was aimed to evaluate and compare the frictional characteristics of three newly introduced passive ceramic self-ligating brackets (SLBs), Damon clear, Truklear, and Cabriolet, using coated and uncoated stainless steel (SS) and nickel titanium (NiTi) archwires. Materials and methods: Fifteen maxillary right central incisor brackets of dimension 0.022" × 0.028" slot: five brackets, each of Damon Clear, Cabriolet, and Truklear brackets. Thirty coated and uncoated SS and NiTi archwires were part of the study. Results: The frictional resistance (FR) with three different passive self-ligating ceramic brackets was studied using three different types of SS and NiTi archwires based on their coating. The Damon Clear bracket showed less FR, while the highest FR was observed for the Truklear bracket when using various types of NiTi archwires; the Truklear bracket showed less FR, while the highest FR was observed for the Cabriolet bracket. Conclusion: FR with three passive SLBs when carried out with the Damon Clear bracket showed less FR, while the Truklear bracket showed the highest FR; and when the study was carried out using NiTi archwire, the Truklear bracket showed less FR, while the Cabriolet bracket demonstrated the highest FR.
Any Orthodontic treatment aims to achieve desired tooth movement with a minimum number of undesirable side effects. Since the beginning of specialty, strategies for anchorage control have been a main consideration in accomplishing successful orthodontic treatment. For a long time, Orthodontists have struggled to achieve effective anchorage control. The current paper highlights various aspects of miniscrew usage like ideal requirements, fundamentals of design, indications, concepts & controversies, limitations, safe zones, placement protocols, anatomic considerations and complications.
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