W Spring for Management of Impacted Teeth |
Author : Dr. Umal Hiralal Doshi |
Abstract | Full Text |
Abstract :Forced eruption of an impacted tooth necessitates a firm and versatile attachment for force application. The present article describes a simple modification of NiTi closed coil spring called W spring for predictable forced eruption of impacted teeth. |
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Evaluation of the Effects of the Chincup Appliance on the Craniofacial Structures by the Finite Element Analysis |
Author : Dr. Beril Demir Karamanli |
Abstract | Full Text |
Abstract :Aims
The aim of this study is to evaluate the effects of the chincup appliance used in the treatment of Class III malocclusions, not only on the mandible or temporomandibular joint (TMJ) but also on all the craniofacial structures.
Materials And Methods
Chincup simulation was performed on a three-dimensional finite element (FE) model. 1000 g (500 g per side) force was applied in the direction of chin-condyle head. Nonlinear FE analysis was used as the numerical analysis method.
Results
By the application of chincup, stresses were distributed not only on TMJ or mandible but also on the circummaxillary sutures and other craniofacial structures.
Conclusions
Clinical changes obtained by chincup treatment in Class III malocclusions are not limited by only mandible. It was seen that also further structures were affected. |
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Interdisciplinary Management of an Orthodontic Patient with Temporomandibular Disorder |
Author : Dr. Franklin Tsang Tsang She |
Abstract | Full Text |
Abstract : 21-year-old female patient presented with temporomandibular disorder, skeletal Class II, Angle Class II division 2 malocclusion, gummy smile, and incomplete overbite was managed successfully by splint therapy and orthodontic camouflage with miniscrew anchorage and extraction. She was treated with occlusal splint to alleviate signs and symptoms of anterior disc displacement without reduction and the associated masticatory dysfunction and revealed the true malocclusion before orthodontic treatment. Computer software facilitated the formulation of visual treatment objective (VTO) and occlusogram which guided the whole arch intrusion, retraction of the upper anterior segment, mesialization of lower left dentition, and distalization of lower right dentition. In this case report, the rationale and importance of preorthodontic splint therapy and specific considerations in orthodontic mechanics for managing this patient were discussed. |
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Accuracy of Three-dimensional Cone Beam Computed Tomography Digital Model Measurements Compared with Plaster Study Casts |
Author : Prof. Donald J. Ferguson |
Abstract | Full Text |
Abstract :Purpose
The purpose of this study was to assess the accuracy of three-dimensional (3D) cone beam computed tomography (CBCT) study casts by comparing with direct measurements taken from plaster study casts.
Materials And Methods
The dental arches of 30 patient subjects were imaged with a Kodak 9300 3D CBCT devise; Anatomodels were created and in vivo 5 imaging software was used to measure 10 dental arch variables which were compared to measurements of plaster study casts.
Results:
Three of the 10 variables, i.e., overbite, maxillary intermolar width, and arch length, were found significantly smaller (P < 0.05) using the Anatomodels following nonparametric Wilcoxon signed-rank testing. None of the differences found in the study averaged <0.5 mm.
Conclusions
3D CBCT imaging provided clinically acceptable accuracy for dental arch analysis. 3D CBCT imaging tended to underestimate the actual measurement compared to plaster study casts. |
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Comparison of the Changes in Hyoid Bone Position in Subjects with Normodivergent and Hyperdivergent Growth Patterns: A Cephalometric Study |
Author : Dr. Faisal Arshad |
Abstract | Full Text |
Abstract :Objective
The aim of this study is to test the hypothesis that there is no difference in hyoid bone position among individuals with different growth patterns before and after treatment.
Materials And Methods
Pre- and post-treatment lateral cephalogram of forty Class I adults in the age group of 20–27 years were grouped. All the cases were treated with the first premolar extraction in all quadrants. Based on the growth pattern of the face, individuals were divided into: (1) Group 1 (n = 20): Normodivergent, i.e., FH/MP angle smaller than 30.5° (20 patients). (2) Group 2 (n = 20): Hyperdivergent, i.e., FH/MP angle larger than 30.5° (20 patients). Lateral cephalograms were traced and analyzed manually for evaluation of hyoid bone position. Patients in both groups were treated with preadjusted appliances. Pre- and post-treatment lateral cephalograms were traced, and variables were compared using paired t-test, and the relationship between dentofacial variables, growth pattern, and the hyoid bone position was analyzed using Karl Pearson’s correlation coefficient method. The changes of hyoid position after treatment were compared using t-test.
Results
The data were analyzed by Kolmogorov–Smirnov and paired t-test. Karl Pearson’s correlation coefficient test was performed to determine whether there was an association between the changes of hyoid and growth pattern. Following retraction of incisors, statistically significant correlation was observed in the pre- and post-treatment values of dentofacial structures and hyoid bone, but no significant correlation was found in position of the hyoid bone in the normodivergent and hyperdivergent groups. In both the groups, hyoid bone moved in an inferior and posterior direction after orthodontic treatment.
Conclusion
No change was seen in position of the hyoid bone in normodivergent and hyperdivergent groups. |
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Class III Molar Finish as a Different Treatment Approach to Correct an Adolescent Class II Patient Using Headgear, Forsus, and Lower Arch Extraction |
Author : Dr. Shafees Koya |
Abstract | Full Text |
Abstract :Various treatment strategies are adopted to correct a Class II malocclusion depending on the age, the amount of remaining growth and severity of malocclusion. Single arch extraction of the lowers is rarely done in a Class II malocclusion. The following case report describes an alternate treatment approach of an adolescent Class II patient treated with a combination of headgear, fixed functional appliance (forsus), and single arch extraction only in the lower arch. The case was finished in a Class III molar and a Class I canine relationship. The results were stable in 3 years follow-up. |
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Responsibilities and Retention |
Author : Dr. Simon J. Littlewood |
Abstract | Full Text |
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Through the Murky Waters of “Web-based Orthodontics,” Can Evidence Navigate the Ship? |
Author : Prof. Nikhilesh Vaid |
Abstract | Full Text |
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