RESUMO
Los nuevos materiales estéticos no han ocasionado el abandono de las obturaciones de amalgama, es por eso que es importante proponer elementos que le den longevidad a las restauraciones. El propósito de este estudio fue determinar la relación entre los niveles de bioelectricidad y la presencia de base intermedia en obturaciones de amalgama. El presente estudio es un diseño de tipo descriptivo transversal, la población de estudio se conformó por un total de 30 de obturaciones de pacientes que fueron atendidos en la Clínica Odontológica de la Universidad Cooperativa de Colombia de la ciudad de Pasto en el segundo semestre académico del 2007. Los niveles de bioelectricidad se midieron en microamperios con un tester Techma TM-086 en sensibilidad de 20 uA. El mayor promedio de bioelectricidad lo generaron las restauraciones de amalgama que no presentaron base intermedia con un promedio de 0,02867 UA (Mann-Whitney- p=0.031) con respecto a las que tenían base intermedia con un promedio de -0.07133uA y la marca de amalgama que más bioelectricidad generó fue la New Stetic con un promedio de 0,01535 uA (Kruskal wallis - p=0.008) con respecto a SDI con un promedio de -0.16633 uA y Kerr con un promedio de -0.0998 uA. La intensidad del pasaje de corriente disminuye en las obturaciones de amalgamas cuando presentan base intermedia.
Assuntos
Amálgama Dentário , Condutividade Elétrica , Eletrogalvanismo IntrabucalRESUMO
Titanium and its alloys are used in dentistry for implants because of its unique combination of chemical, physical, and biological properties. They are used in dentistry in cast and wrought form. The long term presence of corrosion reaction products and ongoing corrosion lead to fractures of the alloy-abutment interface, abutment, or implant body. The combination of stress, corrosion, and bacteria contribute to implant failure. This article highlights a review of the various aspects of corrosion and biocompatibility of dental titanium implants as well as suprastructures. This knowledge will also be helpful in exploring possible research strategies for probing the biological properties of materials.
Assuntos
Materiais Biocompatíveis/química , Corrosão , Ligas Dentárias/química , Implantes Dentários/efeitos adversos , Falha de Restauração Dentária , Eletrogalvanismo Intrabucal , Humanos , Saliva/química , Saliva/microbiologia , Titânio/químicaRESUMO
<p><b>OBJECTIVE</b>To measure the magnitude of galvanic currents produced by different occluding metallic contact.</p><p><b>METHODS</b>The circuits of instantly different metallic contact were simulated in artificial saliva, and electrical potential of every couple and 15 currents of instant contact were then measured. After 8 hours' soaking, 15 currents were obtained in addition.</p><p><b>RESULTS</b>Galvanic currents variation produced hy intermittently metallic contact was ruleless. During early soaking, gold/titanium, gold/high zinc-containing amalgam and low/high zinc-containing amalgam exhibited much higher current, and there was significant difference on currents between titanium/high zinc-containing amalgam and other couples (P < 0.05). There was also significant difference on currents between titanium/high zinc containing amalgam, titanium/low zinc-containing amalgam and gold/titanium, gold/low zinc-containing amalgam and gold/high zinc-containing amalgam after 8 hours' soaking (P < 0.05). In contrast with currents produced by couples before and after 8 hours' soaking, only the currents produced by gold/high zinc-containing amalgam proved to be no significant of difference (P > 0.05), while the currents produced by gold/low zinc-containing amalgam and titanium/high zinc-containing amalgam increased. Potential of high zinc-containing amalgam was more negative than other alloys, and it was always under anodic behavior during the experiment corrupted acceleratedly.</p><p><b>CONCLUSION</b>Dentists can't ignore the case that the patient feels normal at the beginning of wearing different occluding metallic restorations. Either of gold/ titatium, gold/high zinc-containing amalgam and low/high zinc-containing amalgam appearing in oral will do harm to the patients' health. Neither of gold/low zinc-containing amalgam nor titanium/high zinc-containing amalgam can coexist in oral. Zinc-free or low zinc-containing amalgam should be selected instead of high zinc-containing amalgam.</p>
Assuntos
Humanos , Ligas , Corrosão , Ligas Dentárias , Amálgama Dentário , Eletrogalvanismo Intrabucal , Ouro , TitânioAssuntos
Ligas Dentárias/química , Colagem Dentária , Metais/química , Ligas Metalo-Cerâmicas/química , Cimentação/métodos , Cimentos de Ionômeros de Vidro/química , Ligas de Cromo/química , Coroas/normas , Porcelana Dentária/química , Prótese Adesiva/normas , Eletrogalvanismo Intrabucal , Ligas de Ouro/química , Condicionamento Ácido do Dente/métodos , Óxido de Alumínio/química , Cimentos de Resina/química , Propriedades de SuperfícieRESUMO
A açäo galvânica entre o ouro e três tipos de amálgamas foi utilizada como recurso para se ressaltar a influência do polimento nos amálgamas, precedido ou näo da brunidura, na produçäo de corrente elétrica "in vitro" e na evoluçäo da corrosäo "in vivo". Ambos os testes demonstraram que a brunidura seguida de polimento reduz os níveis de corrente elétrica e corrosäo dos amálgamas, sendo as ligas de maior conteúdo de cobre as mais sensíveis a este tipo de acabamento