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Background: Space closure by en masse intrusion and retraction in orthodontics is of particular interest. Aim: The aim of this study was to evaluate the stress distribution and displacement of maxillary anterior teeth. Materials and Methods: Four different finite element models of maxillary arch were constructed to understand the nature of stresses and displacement patterns of anterior teeth during en masse intrusion and retraction on force application with different combinations of mini-implants and retraction hooks. Results: In this study, tensile stresses were seen in the cervical region and various movements of teeth such as lingual crown tipping, bodily movement, lingual root tipping, intrusion, and extrusion were observed. Conclusion: Nature of stresses changes from tensile to compressive from cervical area to apical area. Various tooth displacements suggest that different combinations of mini-implants and retraction hooks affect the direction of the tooth movement.

Introduction The aim of this study is to evaluate stress and displacement effects of maxillary posterior intrusion mechanics with mini-implant anchorage by using finite element method. Materials and Methods A computer stimulation of three-dimensional model maxilla with all teeth, PDL, bone, mini-implants, brackets, arch wire, force element, and transpalatal arch was constructed on the basis of average anatomic morphology. Finite element analysis was done to evaluate the amount of stress and its distribution during orthodontic intrusive force. Results Increased Von Mises stress values were observed in mesio-cervical region of first molar. The middle third of second premolar and second molar and regions adjacent to force application sites also showed relatively high stress values. Minimum stress values were observed in apical region of first premolar as it is away from force application. Conclusion Using three mini-implant and transpalatal arches, this study demonstrates that significant amount of true intrusion of maxillary molars could be obtained with lesser concentration of stresses in the apical area recorded.

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Objective: To assess skeletal, dentoalveolar, and soft-tissue effects of fixed functional appliances (FFAs), alone or in combination with multibracket appliances (comprehensive treatment), on Class II malocclusion in postpubertal patients. Data Sources: Literature survey was conducted using the Medline, SCOPUS, Latin American and Caribbean Health Sciences, and Scientific Electronic Library Online databases and the Cochrane Library, and through a manual search. No restrictions were set regarding the type of fixed appliance, treatment length, or to the cephalometric analysis used. Data extraction was mostly predefined at the protocol stage by 2 authors. Study Selection: Only double-blind randomized controlled trials (RCTs) of Class II skeletal cases treated by any FFA that had assessed specific skeletal, dental, or soft-tissue parameters were included. Data Synthesis: A total of 8 articles qualified for the final analysis. The studies were composed of late-adolescent or adult patients who were at the end of their postpubertal growth period. This meta-analysis included data from 271 subjects (142 Class II patients and 129 untreated individuals) and 8 RCTs, which assessed linear as well as angular cephalometric changes induced by Class II treatment with FFAs. Conclusions: Based on the data available on postpubertal patients, it was concluded that the fixed functional treatment is effective in Class II malocclusion and shows changes in skeletal, dental, as well as soft tissue.

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Skeletal class II malocclusion in adult patients with severe gummy smile is challenging for orthodontist and often requires surgical intervention. The difficulty increases when patients refuse orthognathic surgery, and orthodontists have limited treatment alternatives. This report describes the case of a patient with severe dento-skeletal class II malocclusion with excessive gingival display while smiling. The patient was treated with temporary anchorage devices, and an innovative method of lip repositioning was devised to correct the irregularity.

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