Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties
[eng] The purpose of the present thesis is to be a basic and initial contribution to the knowledge about the corrosive behaviour of the archwires commonly used in lingual orthodontics. Once corrosive behaviour is understood, conclusions could be drawn regarding clinical implications both for the pro...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/35848 |
| Acceso en línea: | https://hdl.handle.net/2445/35848 http://www.tdx.cat/TDX-0408108-114645 http://hdl.handle.net/10803/2509 |
| Access Level: | acceso abierto |
| Palabra clave: | Materials dentals Níquel Aparells d'ortodòncia Dental materials Nickel Orthodontic appliances |
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Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| title |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| spellingShingle |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties Suárez Martínez, Carlos Materials dentals Níquel Aparells d'ortodòncia Dental materials Nickel Orthodontic appliances |
| title_short |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| title_full |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| title_fullStr |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| title_full_unstemmed |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| title_sort |
Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their properties |
| dc.creator.none.fl_str_mv |
Suárez Martínez, Carlos |
| author |
Suárez Martínez, Carlos |
| author_facet |
Suárez Martínez, Carlos |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Gil, F. X. (Francesc Xavier) Vilar Martínez, Ma. Teresa Universitat de Barcelona. Departament d'Odontoestomatologia |
| dc.subject.none.fl_str_mv |
Materials dentals Níquel Aparells d'ortodòncia Dental materials Nickel Orthodontic appliances |
| topic |
Materials dentals Níquel Aparells d'ortodòncia Dental materials Nickel Orthodontic appliances |
| description |
[eng] The purpose of the present thesis is to be a basic and initial contribution to the knowledge about the corrosive behaviour of the archwires commonly used in lingual orthodontics. Once corrosive behaviour is understood, conclusions could be drawn regarding clinical implications both for the progress of the treatment and the patients' safety. The archwires chosen for the study were:1. Respond® 0.0175 inches 2. D-Rect® 0.016x0,022 inches 3. Stainless Steel 0.016 inches 4. Stainless Steel 0.016x0,022 inches 5. Ni-Ti® 0.016 inches 6. TMA® 0.016 inches 7. Copper Ni-Ti® 0.017x0.017 inches. The objectives of the thesis are: 1. To study the as-received microscopical aspect of the lingual orthodontics archwires and the surface structural changes of the archwires after being in contact with a saline preparation for 30 days through scanning electronic microscopy (SEM) and atomic force microscopy (AFM) 2. To study the basic corrosive properties of the archwires in order to determine the potential of corrosion and the pitting potential for each archwire and also the microscopical effects of corrosion on archwires with SEM and AFM after anodic potentiostatic polarization. 3. To study the ionic release of Ni of the Ni containing archwires to evaluate its potential danger for the patient. 4. To evaluate the changes that corrosion may have on the martensitic and austenitic phase transformations of the nickel and titanium containing archwires. The highest tendency to general corrosion was seen for Respond archwires followed by D-Rect and 0.016 inch Stainless Steel archwires. Cyclic Voltammetry results showed that Ecorr values were similar for Respond, D-Rect and 0.016x0.022 Stainless Steel archwires being the 0.016 Stainless Steel archwires the most prone to corrosion processes. It was seen that archwires made of Ti alloys were highly resistant to general corrosion processes. The lowest Eb values were obtained for Respond archwires followed by D-Rect and 0.016 Stainless Steel archwires. Higher values were observed for 0.016x0.022 Stainless Steel archwires. AFM enabled an objective characterisation of surface changes by measuring the Roughness Mean Surface (RMS). This value allowed a comparison between archwires immersed in Hank's Balanced Salt Solution for 30 days and a control group. Results show statistically significant differences after immersion for all archwires with the exception of NiTi archwires. Scanning electronic microscopy did not enable to see differences between both groups. Ni release has been seen to be very low and it is far below the limits set by the European Union legislation and the levels known to inflict cell damage. The highest amount of Ni was released by the Stainless Steel archwires followed by Respond and NiTi archwires. The lowest amounts of Ni released were recorded for CuNiTi and D-Rect archwires. With regards to calorimetry, NiTi archwires showed a clear R-phase while none of the CuNiTi archwires did in the new, polarised and immersed groups. Immersion seems to have no impact on the phase transition temperatures of NiTi archwires while some changes observed in CuNiTi arches should be further studied. |
| publishDate |
2008 |
| dc.date.none.fl_str_mv |
2008 |
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info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion |
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doctoralThesis |
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publishedVersion |
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https://hdl.handle.net/2445/35848 http://www.tdx.cat/TDX-0408108-114645 http://hdl.handle.net/10803/2509 |
| url |
https://hdl.handle.net/2445/35848 http://www.tdx.cat/TDX-0408108-114645 http://hdl.handle.net/10803/2509 |
| dc.language.none.fl_str_mv |
Inglés |
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Inglés |
| dc.rights.none.fl_str_mv |
(c) Suárez Martínez, 2008 info:eu-repo/semantics/openAccess |
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(c) Suárez Martínez, 2008 |
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openAccess |
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application/pdf |
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Universitat de Barcelona |
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Universitat de Barcelona |
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Tesis Doctorals - Departament - Odontoestomatologia reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
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Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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1869423274543284224 |
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Degradation of lingual orthodontics archwires. The effect of corrosion and nickel release on their propertiesSuárez Martínez, CarlosMaterials dentalsNíquelAparells d'ortodònciaDental materialsNickelOrthodontic appliances[eng] The purpose of the present thesis is to be a basic and initial contribution to the knowledge about the corrosive behaviour of the archwires commonly used in lingual orthodontics. Once corrosive behaviour is understood, conclusions could be drawn regarding clinical implications both for the progress of the treatment and the patients' safety. The archwires chosen for the study were:1. Respond® 0.0175 inches 2. D-Rect® 0.016x0,022 inches 3. Stainless Steel 0.016 inches 4. Stainless Steel 0.016x0,022 inches 5. Ni-Ti® 0.016 inches 6. TMA® 0.016 inches 7. Copper Ni-Ti® 0.017x0.017 inches. The objectives of the thesis are: 1. To study the as-received microscopical aspect of the lingual orthodontics archwires and the surface structural changes of the archwires after being in contact with a saline preparation for 30 days through scanning electronic microscopy (SEM) and atomic force microscopy (AFM) 2. To study the basic corrosive properties of the archwires in order to determine the potential of corrosion and the pitting potential for each archwire and also the microscopical effects of corrosion on archwires with SEM and AFM after anodic potentiostatic polarization. 3. To study the ionic release of Ni of the Ni containing archwires to evaluate its potential danger for the patient. 4. To evaluate the changes that corrosion may have on the martensitic and austenitic phase transformations of the nickel and titanium containing archwires. The highest tendency to general corrosion was seen for Respond archwires followed by D-Rect and 0.016 inch Stainless Steel archwires. Cyclic Voltammetry results showed that Ecorr values were similar for Respond, D-Rect and 0.016x0.022 Stainless Steel archwires being the 0.016 Stainless Steel archwires the most prone to corrosion processes. It was seen that archwires made of Ti alloys were highly resistant to general corrosion processes. The lowest Eb values were obtained for Respond archwires followed by D-Rect and 0.016 Stainless Steel archwires. Higher values were observed for 0.016x0.022 Stainless Steel archwires. AFM enabled an objective characterisation of surface changes by measuring the Roughness Mean Surface (RMS). This value allowed a comparison between archwires immersed in Hank's Balanced Salt Solution for 30 days and a control group. Results show statistically significant differences after immersion for all archwires with the exception of NiTi archwires. Scanning electronic microscopy did not enable to see differences between both groups. Ni release has been seen to be very low and it is far below the limits set by the European Union legislation and the levels known to inflict cell damage. The highest amount of Ni was released by the Stainless Steel archwires followed by Respond and NiTi archwires. The lowest amounts of Ni released were recorded for CuNiTi and D-Rect archwires. With regards to calorimetry, NiTi archwires showed a clear R-phase while none of the CuNiTi archwires did in the new, polarised and immersed groups. Immersion seems to have no impact on the phase transition temperatures of NiTi archwires while some changes observed in CuNiTi arches should be further studied.[spa] Esta tesis pretende realizar un estudio de los arcos diseñados específicamente para la técnica de ortodoncia lingual y contribuir al conocimiento de su comportamiento. Particularmente se centra en los cambios de las propiedades superficiales de los arcos, su desprendimiento iónico, y en los arcos en que corresponde, la variación de propiedades que afectan a la expresión de la memoria de forma. Se estudiaron los siguientes arcos: 1. Respond® 0.0175 pulgadas. 2. D-Rect® 0.016 x 0.022 pulgadas 3. Stainless Steel 0.016 pulgadas. 4. Stainless Steel 0.016 x 0.022 pulgadas 5. Ni-Ti® 0.016 pulgadas 6. TMA® 0.016 pulgadas 7. Copper Ni-Ti® 0.017 x 0.017 pulgadas. En concreto, se han establecido los siguientes objetivos: 1. Caracterizar microscópicamente (microscopía electrónica de barrido o SEM) los arcos de ortodoncia lingual tal y como son recibidos del fabricante y comparar los efectos que tiene el contacto durante 30 días de una solución que simula las propiedades de la saliva sobre los arcos, caracterizando los cambios ocurridos con SEM y de fuerzas atómicas (AFM). 2. Caracterizar las propiedades corrosivas básicas de los arcos de ortodoncia lingual para conocer el potencial de corrosión, los potenciales de picadura para cada arco y los efectos que la polarización anódica potenciostática tiene sobre la superficie de los arcos con SEM. 3. Determinar el desprendimiento iónico de Ni de los arcos linguales de aleaciones que contienen Ni. 4. Evaluar los cambios que la inmersión de los arcos en solución de saliva artificial y los arcos sometidos a corrosión potenciostática tienen sobre las temperaturas de transformación de fase de los arcos de aleaciones NiTi y CuNiTi. La mayor tendencia a la corrosión general se ha visto en los arcos Respond, D-Rect y acero inoxidable 0,016 pulgadas. Los resultados de CV han mostrado que los valores de Ecorr fueron muy similares para los arcos Respond, D-Rect y de acero inoxidable de 0,016x0,022 pulgadas. Los arcos de acero inoxidable de 0,016 pulgadas obtuvieron el valor más bajo de Ecorr, indicando ser el más sensible a los procesos de corrosión. Se observó que los arcos de aleación de Ti son muy resistentes a los procesos de corrosión general Los valores más pequeños de Eb fueron obtenidos para los arcos de Respond, seguidos por los D-Rect y los arcos de acero inoxidable de 0,016 pulgadas. Se observaron valores de Eb en un rango más alto para los arcos de acero inoxidable de 0,016x0,022 pulgadas. La técnica microscópica de AFM ha permitido caracterizar de una forma objetiva la de su rugosidad superficial (RMS). Este valor se ha comparado con los valores de rugosidad en muestras que permanecieron 30 días expuestas al contacto con la solución de Hank. Los resultados obtenidos muestran diferencias estadísticamente significativas excepto para los arcos de NiTi Se ha visto que el desprendimiento de Ni es muy pequeño y que está muy por debajo de los límites establecidos por la regulación vigente en la Unión Europea, y por debajo de los límites conocidos como nocivos para las células. La mayor cantidad de Ni ha sido desprendida por los arcos de acero inoxidable, seguidos por el Respond y los arcos de NiTi. Los arcos de CuNiTi y D-Rect fueron los que desprendieron menores cantidades de Ni al final de la prueba. Por lo que respecta al estudio de calorimetría, no se ha hallado la fase R en los ensayos de calorimetría con los arcos de CuNiTi (nuevos, usados en prueba de inmersión de 30 días y los polarizados), en los de NiTi sí. La inmersión de los arcos de NiTi en solución de Hank parece no tener ningún impacto en las temperaturas de transición de fase.Universitat de BarcelonaGil, F. X. (Francesc Xavier)Vilar Martínez, Ma. TeresaUniversitat de Barcelona. Departament d'Odontoestomatologia2008info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/35848http://www.tdx.cat/TDX-0408108-114645http://hdl.handle.net/10803/2509Tesis Doctorals - Departament - Odontoestomatologiareponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglés(c) Suárez Martínez, 2008info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/358482026-05-27T06:46:51Z |
| score |
15.301603 |