Orthodontics
Pasupureddi Keerthana; Meghna Mukhopadhyay; Shubhnita Verma; Prasad Chitra
Abstract
Aim: The aim of this study was to analyze and synthesize data from animal research on the impact of hormones and their synthetic derivatives on orthodontic tooth movement by altering calcium metabolism.Methods: Eight databases were scanned electronically, followed by a manual search, until 27 February ...
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Aim: The aim of this study was to analyze and synthesize data from animal research on the impact of hormones and their synthetic derivatives on orthodontic tooth movement by altering calcium metabolism.Methods: Eight databases were scanned electronically, followed by a manual search, until 27 February 2022. Animal experiments were chosen with control groups exploring the impact on orthodontic tooth movement with calcitonin, calcium, parathyroid hormone, teriparatide, and vitamin D. The reporting quality of primary studies was assessed using the CAMARADES tool. Data was collected from related studies and SYRCLE’s risk of bias tool was utilized to determine risk of bias.Results: Of the 2388 documents obtained in the search, 11 studies were included. The amount of orthodontic tooth movement reduced with the administration of calcitonin and calcium. However, with parathyroid hormone, teriparatide, and vitamin D, acceleration of tooth movement was noted. The results were statistically significant omitting three studies that assessed orthodontic tooth movement with calcium, vitamin D, and parathyroid hormone. Root resorption increased with calcium, vitamin D, PGE2, and a dose-dependent decrease was seen in higher doses of calcitonin. Bone mineral density improved with increased parathyroid hormone levels.Conclusion: Vitamin D, their synthetic derivatives, and parathyroid hormone were found to increase orthodontic tooth movement. Calcitonin showed a dose dependent reduction in orthodontic tooth movement.
Massoud Seifi; Roya Hamedi; Maryam Nazirii
Abstract
Background and aim: Orthodontic tooth movement requires remodeling of periodontal tissues, especially alveolar bone. A major objective of investigators is to achieve maximum tooth movement with minimal root damage. The aim of this study is to determine if the rate and amount of orthodontic tooth movement ...
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Background and aim: Orthodontic tooth movement requires remodeling of periodontal tissues, especially alveolar bone. A major objective of investigators is to achieve maximum tooth movement with minimal root damage. The aim of this study is to determine if the rate and amount of orthodontic tooth movement in a sample of rats could be enhanced by the injection of a vitamin D metabolite and Prostaglandin E2.Materials and Methods: Thirty-Two male Wistar rats were randomly divided into 4 groups of eight rats each: 1- 1.5 IU/ml vitamin D was injected into the thigh muscle after installation the orthodontic appliance in first group (Vit D group)
2- 0.1 ml of 1 mg/ml PGE2 was injected submucosally in the second group (PGE2 group).
3- In the third group, 1.5 IU/ml vitamin D and 0.1 ml of 1 mg/ml PGE2 was injected submucosally (Vit D+ PGE2).
4- Distilled water (0.1 ml) was used in control group .In order to calculate the tooth movement; the distance between the upper right first and second molars was measured.Results: All groups have a significant difference with control group (p<0.05). The most mean OTM was observed in the Vit D+PGE2 group (Mean = 0.702± 0.04897mm) that was significantly higher than the Vit D, PGE2 and control groups (P< 0.05). A significant difference (P< 0.05) in root resorption was observed between the PGE2 (0.0192 ±0.000675 mm2) and the other groups.Conclusion: In order to achieve a decrease in root resorption and an increase in OTM, the combination Vit D+PGE2 is useful and there is a synergism effect with Vit D and PGE2.
Allahyar Geramy; Hannane Ghadirian
Abstract
Aim: Bent root forms are always a challenging point in an orthodontic treatment. The main aim of this study has been to assess the stress effects of a dilaceration in apical third of an upper central incisor in orthodontic movement.Materials and Methods: Three FEM models of an upper central incisor were ...
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Aim: Bent root forms are always a challenging point in an orthodontic treatment. The main aim of this study has been to assess the stress effects of a dilaceration in apical third of an upper central incisor in orthodontic movement.Materials and Methods: Three FEM models of an upper central incisor were designed with cortical and spongy bone, PDL, and teeth. The only difference between 3D models was the anatomy of the apical fourth of their root. A 30-deg (the first model) and a 60-degree (the second model) dilaceration in the apical fourth of the root were designed in a labial direction. The calculation was in ANSYS Workbench Ver. 11.0. A 1.0 N labio-palatal force was applied in 45 degrees to the horizontal plane in the labial side of the crown. Von mises stress was evaluated along a path of nodes starting at the mid root area at labial moving towards the apex and continuing to reach the mid root lingual region on root surface.
Results: The apical stress did not show a dramatic increase in dilacerated form models starting from 0.11 MPa in normal model to 0.17 MPa in a 60-degree dilacerations model. Moving away from the apex, the stress findings increased which was noticeable between the normal model (0.48 MPa) and the 60-degree model (2.11 MPa).Conclusion: Based on the findings of this FEN! study, It was shown that the increase in the stress in areas away from the apex can be interpreted as the reason to the start of the external root resorption. There may be other models of the pointed apex root forms to show an increase in the apical area stress which was not the case in this model.
Allahyar Geramy; Amir hooman Sadr Haghighi; Saeede Mokhtari Khoee
Abstract
Aim: Orthodontic treatment outcomes are combination of advantages and disadvantage. The force implied during treatment could affect dental pulp status. Amount of changes in pulp complex depend on the types of tooth movements and whether the apex is open or not. The aim of this study is to compare the ...
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Aim: Orthodontic treatment outcomes are combination of advantages and disadvantage. The force implied during treatment could affect dental pulp status. Amount of changes in pulp complex depend on the types of tooth movements and whether the apex is open or not. The aim of this study is to compare the effects of different orthodontic tooth movements in two kinds of open and normal apices by 3D Finite element analysis.
Materials and Methods: Two three-dimensional Finite element models of an upper central incisor were modeled based on average dimensions. The models contained cortical and spongy bone, uniform thickness PDL of 0.25 mm and an upper central incisor. The differences between the models was the apex development which was complete in the first model and open in the second one in Solid- works 2006 and transferred to ANSYS Workbench Ver. 11.0. Different force systems to produce tipping, bodily and intrusion were applied in the tooth crown. The Von Mises stress was assessed along two defined paths.
Results: Maximum amount of the stress along the long axis of pulp belonged to open apex by tipping movement then intrusion with normal apex and finally bodily movement in open apex samples. In evaluation as regard of stress along apical third of PDL the highest stress created by intrusion in normal apex group.
Conclusion: In open apex, tipping and bodily movement could induce much more stress and in normal apex the concern of root resorption by intrusion was more than other types of tooth movements.
