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- Alamadi, E., et al.
(författare)
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A comparative study of cone beam computed tomography and conventional radiography in diagnosing the extent of root resorptions
- 2017
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Ingår i: Progress in Orthodontics. - : Springer Science and Business Media LLC. - 2196-1042. ; 18, s. 1-8
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Tidskriftsartikel (refereegranskat)abstract
- Root resorptions are assessed and diagnosed using different radiographical techniques. A comparison of the ability to assess resorptions on two-dimensional (2D) and three-dimensional (3D) radiographs is, hitherto, lacking. The aims of this study were to evaluate the accuracy of 2D (periapical radiographs, PA and panoramic radiograph, PAN) and 3D (cone beam computed tomography, CBCT) radiographic techniques in measuring slanted root resorptions compared to the true resorptions, a histological gold standard, in addition to a comparison of all the radiographic techniques to each other. Radiographs (CBCT, PA, and PAN), in addition to histological sections, of extracted deciduous canines from thirty-four patients were analyzed. Linear measurements of the most and least resorbed side of the root, i.e., "slanted" resorptions, were measured using an analyzing software (Facad A (R)). For classification of slanted root resorptions, a modified Malmgren index was used. PAN underestimated the root length on both the least and most resorbed side. Small resorptions, i.e., low modified Malmgren scores, were more difficult to record and were only assessed accurately using CBCT. The root resorption scores were underestimated using PA and PAN. In assessment of linear measures, PAN differed significantly from both CBCT and PA. CBCT is the most accurate technique when measuring and scoring slanted root resorptions.
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- Çevik Aras, Hülya, 1975, et al.
(författare)
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Monitoring Salivary Levels of Interleukin 1 Beta (IL-1 β) and Vascular Endothelial Growth Factor (VEGF) for Two Years of Orthodontic Treatment: A Prospective Pilot Study
- 2021
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Ingår i: Mediators of Inflammation. - : Hindawi Limited. - 0962-9351 .- 1466-1861. ; 2021
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Tidskriftsartikel (refereegranskat)abstract
- Background and Objective. Vascular endothelial growth factor (VEGF) and interleukin 1 beta (IL-1β) perform functions in orthodontic tooth movement and can be measured in the saliva. This novel approach is aimed at monitoring continuous changes in IL-1β and VEGF levels in saliva during two years of orthodontic treatment. Material and Methods. Nine healthy females (15-20 years of age) with crowding requiring four premolar extractions and fixed appliances in both jaws were included in this prospective pilot study. A total of 134 stimulated and 134 unstimulated saliva samples were collected during two years of treatment: before tooth extractions (baseline) and then every 6-8 weeks at follow-up appointments. All saliva samples were analysed by the enzyme-linked immunosorbent assay. The mean levels of IL-1β and VEGF were calculated according to the different orthodontic treatment stages: alignment, space closure, and finishing. Repeated analysis of variance (ANOVA) measurements were used to compare the means between different treatment stages. The percentage difference in IL-1β and VEGF between the different treatment stages was analysed by Bland-Altman plots. Results. A gradual increase in IL-1β and VEGF was observed at alignment, reaching significance at space closure (p=0.002 and p=0.025, respectively). At finishing, both IL-1β and VEGF declined, however, without reverting to baseline values (p=0.172 and p=0.207, respectively). Bland-Altman analysis showed the agreement between IL-1β and VEGF in terms of a systematic increase, with a higher percentage difference for VEGF. Conclusions. The salivary levels of both IL-1β and VEGF increased following orthodontic treatment and reached their peaks during the treatment stage of space closure. This novel approach provides a hint on how and when to sample saliva during orthodontic treatment to analyse bone remodelling. © 2021 Hülya Çevik-Aras et al.
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- Lundgren, Ted, 1959, et al.
(författare)
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How sandblasting on lingual surfaces can be carried out with minimum enamel damage: An in vitro study on human teeth
- 2020
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Ingår i: International Orthodontics. - : Elsevier BV. - 1761-7227. ; 18:4, s. 820-826
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Tidskriftsartikel (refereegranskat)abstract
- Objective > The aim was to assess the extent of enamel damage sandblasting might cause and to identify a combination of sandblasting durations and MicroEtcher nozzle-tooth surface distance (NTD) resulting in the least enamel damage. Materials and methods > Lingual surfaces of 30 human teeth were sandblasted with 2 different distances: 1, 2 mm and 3 different durations: 1, 2, 3s and photographed using a light microscope. The cavity depth and diameter of the sandblasted teeth were measured on the light microscope's pictures. A pilot study was performed to minimize possible combinations of sandblasting durations and distances. To validate the measurement method, sandblasted teeth were ground cut for comparison. Inter-examiner reliability was assessed with Bland-Altman analysis. Mann-Whitney Utest was used to detect cavity and diameter changes for every sandblasting duration and NTD combination. Results > From the pilot study sandblasting durations 1,2 and 3s and NTD < 2 mm were chosen. The cavity diameter of the sandblasted area did not change with increased sandblasting duration nor NTD (P > 0.05). The cavity depth of the sandblasted area increased statistically with an increased sandblasting duration (P < 0.05) but did not increase with an increase NTD (P > 0.05). The 95% limits of inter-examiner agreement were narrow. Conclusion > All distance and duration combinations tested caused enamel damage. Sandblasting duration had greater impact on the cavity depth than the NTD. The blasting duration should, therefore, not exceed 2s and the NTD should be held at maximum 2 mm to minimize the risk of unintentional spread.
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