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orbegosoflores_vh_dr_arafo.pdf: 838219 bytes, checksum: 839e8fda83a571e900cce3e586d69abb (MD5) / O objetivo deste trabalho foi avaliar a formação de fendas marginais cervicais através da microscopia eletrônica de varredura, assim como, a microinfiltração marginal em preparos de classe V. foram utilizadas duas técnicas de preparo: P1 utilizando fresa carbide no 245 e P2 que utilizou o jato de ar abrasivo Mach 4.0 (80psi de pressão, 27 æm de tamanho de partícula). O tamanho das cavidades foi padronizado com 1,5 mm de profundidade, 2,0 mm de altura e 3,0 mm de largura. Os materiais utilizados foram: G1 -Optibond solo Plus, G2 - Prime & BondNT e G3 - Scotchbond Multiuso Plus (grupo controle), a resina composta Point 4 utilizada para restaurar as cavidades foi padronizada para todas as restaurações. Foram utilizados 42 dentes molares hígidos divididos em 3 grupos de 14 cada, utilizando a face vestibular e lingual sendo que os preparos mostraram a margem oclusal em esmalte e a margem cervical em cemento/dentina. Após as restaurações serem confeccionadas foram armazenadas em água deionizada durante 24 horas, para posteriormente realizar os procedimentos de acabamento e polimento, a seguir os dentes foram isolados com araldite e esmalte para unha e submetidos a testes de ciclagem térmico (400 ciclos)e imediatamente imersos numa solução de nitrato de prata, durante 2 horas, removidos, lavados e colocados numa solução fotoreveladora durante 16 horas. Nessas condições os dentes foram limpos e seccionados no sentido mésio/distal obtendo duas metades as quais por sua vez foram seccionadas no sentido vestíbulo lingual dividindo as restaurações pela metade. Assim, uma metade da restauração foi avaliada através da lupa esteroscópica para observar a microinfiltração e a outra metade preparada e metalizada para ser avaliada através da microscopia eletrônica de varredura. A análise estatística aplicada aos resultados permite concluir que... . / The aim of this study was to evaluate the formation of cervical gap with SEM, and the marginal microleakage in cavities class V. There were used two techniques for the preparations: P1 using a carbide # 245 and P2 using abrasive air Mach 4.0 (80 psi of preasure, 27nm measurement of the particle). The measurements of the cavities were standardized in 1.5mm of deepness, 2,0mm of highness and 3,0mm of lengthiness. The materials used were: G1 Optibond Solo Plus, G2 Prime & Bond NT and G3 Scotchbond Multiuso Plus (control group), it was used the composite Point 4 as the restorative material for all cavities. Forty-two healthy molars, divided in three groups of 14 each one, were used. Cavities were prepared in the buccal and lingual faces, its occlusal margin was in enamel and its cervical margin was in dentin/cement. After that finishing and polishing was made. Teeth were isolated with analdite and nail varnish and thermocycled (400 times). The preparations were dyed with silver nitrate for two hours. Preparations were stored in a photo developing solution for 16 hours. After that time teeth were cleaned and cut (buccal/lingual) Half of the preparation was observed in a stereoscopic microscope and the other half in a SEM. Results: 1.Preparations with abrasive air had a bigger gap; 2.Adhesive systems do not eliminate the formation of gaps; 3.Best results were found in the group prepared with bur and the adhesive Optibond Solo Plus, with a cervical gap 0,84nm, and in the other hand Scotchbond Multiuso Plus showed marginal gaps of 6,36nm; 4.In the occlusal margin Optibond Solo Plus had more microleakage tha Scotchbond Multiuso Plus and Prime & Bond NT.; 5. In the cervical margin, Optibond Solo Plus had good behavior controlling the marginal microleakage, compared with Scotchbond Multiuso Plus and Prime & Bond that had similar leakage between... (Complete abstract, click electronic address below).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/101403 |
| Date | 07 May 2001 |
| Creators | Orbegoso Flores, Victor Humberto [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Andrade, Marcelo Ferrarezi de [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | 250 f. : il. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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