Characterization of surface topography and chemical composition of mini-implants

Knop, Luégya Amorim Henriques; Soares, Ana Prates; Shintcovsk, Ricardo Lima; Martins, Renato Parsekian; Gandini, Luiz Gonzaga

doi:10.1590/1677-3225v14n3a15

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…The higher percentage of oxygen in the retrieved group could be attributed to the atmospheric oxygen exposure of the miniscrew surface during insertion/removal [2]. The higher oxygen content is proof of the oxidation process that has occurred on the implant surface which is an indication of the increased corrosion rate of the retrieved miniscrew group.…”

Section: Discussionmentioning

confidence: 91%

“…The presence of nitrogen on the surface implies that proteins were adsorbed from body fluids. In a study conducted by Knop et al [2], 1.59% of nitrogen was found on a miniscrew surface. Morra et al [28] suggested that nitrogen contamination is the result of inadequate surface treatment or implant handling The source of calcium on the surface of the retrieved miniscrews could be from the contact of the miniscrew surface with blood involving mainly adsorption of proteinaceous integuments, which are calcified later with the precipitation of calcium [29].…”

Section: Discussionmentioning

confidence: 94%

“…Temporary Anchorage Devices (TADs) provide absolute anchorage to carry out tooth movement [1]. A temporary anchorage device is a device that is temporarily fixed to the bone to enhance orthodontic anchorage either by supporting the teeth of the reactive unit or by obviating the need for the reactive unit altogether and which is subsequently removed after use [2].…”

Section: Introductionmentioning

confidence: 99%

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The Evaluation of Biocompatibility, Elemental Composition and Surface Analysis of Retrieved Infra-zygomatic Screws

et al. 2022

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The study aimed to assess the alterations in the morphology, elemental composition, and biocompatibility of infra-zygomatic crest (IZC) miniscrews, before and after their insertion in the patient’s oral cavity. The study was conducted on 16 IZC miniscrews (8 as-received and 8 retrieved). Scanning electron microscopy (SEM) was used to evaluate the miniscrew surfaces. Micrographs were obtained at ×50, ×100, and ×500 magnification. The miniscrews were subjected to Energy-dispersive x-ray (EDX) analysis to investigate the elemental composition. It was performed at four zones of each miniscrew- head, neck, body, tip. Corrosion of the miniscrews was analyzed through the potentiodynamic polarization (PDP) test by immersing the stainless steel (SS) miniscrews in an artificial saliva medium (pH 5.8) and then allowing it to obtain a steady-state open-circuit potential (OCP) for 15 min. Gingival fibroblasts were cultured using gingival tissue which was used to check the biocompatibility of the miniscrews by observing their proliferation and viability by MTT colorimetric assay. The SEM analysis showed generalized surface dullness, variable corrosion, craters, and blunting in the retrieved miniscrews. EDX analyses showed the deposition of additional elements: carbon, oxygen, calcium, and nitrogen in the retrieved miniscrews. PDP tests showed a higher corrosion rate in the retrieved miniscrews, but the results were not significant. The MTT assay showed that the cell viability was higher in the as-received group and the results were statistically significant with a p value of 0.002. It was concluded that the retrieved miniscrews exhibited morphologic surface changes in the form of dullness, blunting of threads and tips, corrosion, craters, and cracks which were not seen in the as-received miniscrews. A higher percentage of adsorbed elements were seen on the retrieved miniscrew surface. The corrosion rate assessed through the PDP test for both groups was comparable. The fibroblast cell viability was significantly reduced in the retrieved miniscrews when compared to as-received miniscrews.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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The Evaluation of Biocompatibility, Elemental Composition and Surface Analysis of Retrieved Infra-zygomatic Screws

et al. 2022

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“…These devices are widely used in Orthodontics offering excellent results and solving anchorage problems that could not be addressed previously. [9] Despite all the advantages of the miniimplants, there is a small present of the placed mini-implants show failure and loosening due to inaccurate bone support for mechanical retention or fracture during their removal [1] . The fracture may be due to partial osteointegration of mini-screw when left in contact with bone for a long period or due to roughness of the surface that promote osteointegration of bone on the surface of the mini-screw.…”

Section: Introductionmentioning

confidence: 99%

Detection Of Bone Deposition On The Surface Of Immediately Removed Or Left Mini-Screw After Canine Retraction (SEM Study)

El-Mezayen

Gaber

Refai

2022

Egyptian Orthodontic Journal

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The aim of the study is to detect the changes happed on the surface of the mini-screw regarding bone deposition and ions deposited on the surface after retraction of the canine tooth.Patient and method: This study was performed over 10 patients, each one received 2 machined titanium mini-screws in the upper arch between the first molar and second premolar for retraction of canine tooth. After retraction of canine the left side was removed (group 1) and the right side was left in place unloaded until treatment finished then removed (group 2) . The two groups were transferred for scanning electron microscopy to analyze the changes happened on the surface regarding bone and ions deposited on the surface.Results: group 2 samples showed huge differences than group 1 regarding bone deposition on the surface and deposition of calcium and phosphorus ions. Group 2 showed higher bone deposition (3.466 %) than group 1 (0.034%), and in group 2 higher calcium and phosphorous deposition which equal 3.754 , 2.954 mass% respectively than calcium and phosphorus in group 1 which equal 1.949 , 1.606 mass % respectively. Conclusion: using titanium alloy mini-screws for a long term contact with the bone and body fluids result in alteration on the surface, calcium and phosphorus deposition and randomly organized bony tissue osteointegrated on the surface in spite of smoother surface. This bony tissue formation might be enhanced by extended period of retention of mini-screw inside the alveolar bone.

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“…TAD body parts come into contact with the alveolar bone and ensure the stability of the mini-screw. It is essential that the structural and mechanical properties are maintained until the TADs are removed [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

New and Recovered Temporary Anchorage Devices, In Vitro Assessment of Structural and Surface Properties

et al. 2021

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The orthodontic miniscrew (TADs) is a device that is fixed into bone in the short term for the purpose of enhancing orthodontic anchorage. The aim of our study was to investigate the structural and surface properties of recovered TADs after orthodontic treatment, and compare them to new TADs. TADs (n = 15) from the same manufacturer (Absoanchor; Dentos, Daegu, Korea) were assessed; n = 10 were recovered from patients after orthodontic treatment and n = 5 were new. We performed electrochemical investigations, scanning electron microscopy (SEM) and microbiological analysis. Qualitative analysis on general electrochemical polarization revealed that the TADs retrieved from the patients provided much lower current densities in the passivity zone, and the oxidative processes taking place on their surface were of lower intensity. The surface morphologies of the tips of the retrieved mini-implants showed less sharp tips and smooth surfaces. Defects in the form of pores or cracks could be identified in both evaluated TAD groups. All retrieved TADs showed signs of biological materials (SEM analysis) and contamination on their surfaces. In conclusion, these results can assist orthodontists in comprehending the complexities of TAD behavior with respect to their design and structure.

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Characterization of surface topography and chemical composition of mini-implants

Cited by 7 publications

References 16 publications

The Evaluation of Biocompatibility, Elemental Composition and Surface Analysis of Retrieved Infra-zygomatic Screws

The Evaluation of Biocompatibility, Elemental Composition and Surface Analysis of Retrieved Infra-zygomatic Screws

Detection Of Bone Deposition On The Surface Of Immediately Removed Or Left Mini-Screw After Canine Retraction (SEM Study)

New and Recovered Temporary Anchorage Devices, In Vitro Assessment of Structural and Surface Properties

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