Influência do cimento resinoso sobre a adesão de pinos intrarradiculares estéticos

Introducao - O objetivo desde trabalho e avaliar a influencia do tipo de agente de uniao e da dentina radicular (1/3 cervical; medio e apical) sobre a cimentacao adesiva de pinos esteticosde fibra de vidro. Metodos - Foram utilizadas 27 raizes de dentes humanos, divididas em 03 grupos de acordo com o agente cimentante: G1- RelyX Unicem(3M / ESPE); G2- RelyXARC(3M / ESPE) + Adper Single Bond 2(3M / ESPE); G3- Cement-Post(Angelus) + AdperSingle Bond 2(3M / ESPE). Apos a cimentacao, as raizes foram seccionadas transversalmente em tres discos (1,0 ± 0,2 mm de espessura) e submetidos a ensaio opush outo. Resultados - Os valores medios de tensao de retencao em mega pascal (MPa) foram: G1: 1/3 cervical- 7,6;1/3 medio-8,9; 1/3 apical-11,1; G2: 1/3 cervical-2,4; 1/3 medio-3,8; 1/3 apical-7,4; G3: 1/3cervical-3,3; 1/3 medio-3,2; 1/3 apical-7,8. O teste de Kruskal-Walis (α=0,05) evidenciou queapesar do G1 (RelyX Unicem - 3M / ESPE) ter apresentado maiores valores de retencao nos tres tercos radiculares, esta superioridade so foi estatisticamente significante nos tercos cervicale medio; os valores de retencao dos Grupos 2 e 3 nao foram diferentes estatisticamente entre si.Conclusao - O cimento autoadesivo RelyX Unicem (3M / ESPE) apresentou os maiores valores de resistencia adesiva, com diferenca estatisticamente significativa nos tercos cervical e medio (AU) Introduction - The objective of this article is to evaluate the influence of the cement type and root dentin (1/3 cervical; medium; apical) on the adhesive cementation of glass fiber aesthetic posts. Methods - They were used 27 roots from human teeth, divided in three groups according the cement agent: G1- RelyX Unicem, 3M / ESPE; G2- RelyX ARC, 3M / ESPE + Adper SingleBond 2, 3M / ESPE; G3- Cement-Post, arngelus + Adper Single Bond 2, 3M / ESPE. After cementation, the root were cross sectioned in three discs (1,0 ± 0,2 mm high) and submitted topush-out test. Results - Mean values of tension (MPa) of retention were: G1 cervical 1/3: 7,6;medium 1/3: 8,9; apical 1/3 11,1; G2 cervical 1/3: 2,4; medium1/3 3,8; apical 1/3: 7,4; G3cervical 1/3: 3,3; medium1/3: 3,2; apical 1/3 7,8. Kruskall-Walis Test (α=0,05) showed thatalthough G1(RelyX Unicem - 3M / ESPE) had presented higher values of retention at the three root thirds, this superiority was statistically significant only in cervical and medium thirds;the values of retention in Goups 2 and 3 didnit were statistically different between each other.Conclusion - The self-adhesive cement RelyX Unicem (3M / ESPE) presented the highest valuesof adhesive strength, with statistically differences at cervical and medium thirds (AU)