Resistencia da união e qualidade de camada hibrida segundo a forma de interação dos sistemas adesivos a dentina
| Autor: | Salvio, Luciana Andrea |
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| Jazyk: | portugalština |
| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UnicampUniversidade Estadual de CampinasUNICAMP. |
| Druh dokumentu: | Doctoral Thesis |
| Popis: | Orientador: Mario Fernando de Goes Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-06T08:38:04Z (GMT). No. of bitstreams: 1 Salvio_LucianaAndrea_D.pdf: 9815435 bytes, checksum: 9c80659f327995fb1aab0fb6244ecb67 (MD5) Previous issue date: 2006 O objetivo foi avaliar a resistência da união e qualidade de camada híbrida de acordo com o modo de interação de diferentes sistemas adesivos com a dentina. Para a avaliação da resistência da união à tração foram utilizados sete terceiros molares humanos hígidos, os quais foram submetidos cortes perpendiculares ao longo eixo do dente para obtenção de superfícies planas de dentina média. Estas foram secionadas em quatro partes iguais, por dois cortes perpendiculares entre si. Os sistemas de ¿passo único¿ Adper Prompt (ADP) e Xeno III (XE); de ¿dois passos¿ Clearfil SE Bond (SE) e Adhe SE (ADSE); e o Single Bond (SB) foram aplicados sobre as superfícies dentinárias seguindo as instruções dos fabricantes. Sobre a dentina tratada foi construído um bloco de resina composta (Filtek Z250, 3M/ESPE) com 5 mm de altura. Após 24 h, cada espécime foi secionado de modo a obter espécimes com formato de ¿palito¿ com área média de 1mm2 para a realização do teste de tração. Os padrões de fratura foram examinados em microscopia eletrônica de varredura (MEV). Os valores foram submetidos à análise da variância e ao teste Tukey (p This study evaluated the bond strength and hybrid layer formation between different adhesive systems and dentine. To evaluate the bond strength, seven molars fresh extracted were sectioned in multiple parallel layers. The middle dentine layers were selected and sectioned into four equal pieces perpendicular to the previous sections. The ¿one step¿ self-etching adhesive systems Adper Prompt (ADP) and XENO III (XE); the ¿two steps¿ self-etching adhesive systems Clearfil SE Bond (SE) and Adhe SE (ADSE) and the ¿total-etch¿ adhesive Single Bond (SB) were applied on dentine surfaces according to the manufactures¿ instructions. A block of resin (Filtek Z250, 3M/ESPE) of 5 mm height was built in three increments, each one light cured for 20 seconds, on the treated dentine. The specimens were stored in 37°C distilled water for 24h and then sectioned in X and Y directions to obtain 1 mm2 area sticks. The sticks were submitted to a microtensile bond strength test in a universal testing machine (Instron 4411) at a crosshead speed of 0.5mm/min. The results were submitted to one-way analysis of variance and Tukey¿s test at a 5% level of significance. To evaluate the hybrid layer, 15 third molars were used. Two adjacent flat surfaces of middle dentine were obtained for each tooth. The same adhesive system was applied on these two adjacent surfaces, which were applied according to manufacturers' instructions. A resin ¿sandwich¿ block of dentine/resin/dentine was made filling the two adjacent slices with a low viscosity resin, which was polymerized for 20s. After 24 h, each block was mesio-distally sectioned producing 12 interfaces per adhesive. Four interfaces were stained with ammoniacal silver nitrate solution and 4 with silver methenamine solution. The other four were kept without stain and used as a control group. All the interfaces were observed under SEM. The bond strength means, in MPa, were: SE (51.48 ± 15.24); ADSE (37.08 ± 12.55); XE (36.24 ± 11.95); SB (26.20 ± 4.39) and ADP (24.92 ± 6.17). There was prevalence of mixed failure between adhesive and hybrid layer for SB, ADSE and XE; and prevalence of cohesive failure in the adhesive layer for SE and ADP. According to the hybrid layer, SB showed a greater intensity of silver grains deposition than the other systems. SE and ADSE presented similar silver grains depositions but in a small quantity. XE and ADP differing from the others, not only showed moderate amounts of silver grains in the hybrid layer, but also inside the adhesive layer. It was possible to identify nanoleakage inside the bond interface with both used stains. According to the interactions of the adhesive systems with dentine, there were different hybrid layer patterns, which may influence the bond strength Doutorado Materiais Dentarios Doutor em Materiais Dentários |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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