The objective of this study was to investigate the bone repair of carbonate apatite (cHA) in comparison to hydroxyapatite (HA, control group) on osseous repair of rabbit’s tibia. Spheres (400-500 µm) of both materials were synthesized under 37°C (cHA) and 90°C (HA) and were not sinterized. Ethics Commission on Teaching and Research in Animals approved this project (CEPA/NAL 208/10). Six White New Zealand rabbits were submitted to general anesthesia and one perforation (2mm) was made in each tibia for implantation of cHA (left tibia) and HA spheres (right tibia). After 4 weeks all animals were killed and one fragment of each tibia with the biomaterial was collected with a total of 6 bone blocks for each group. Five bone blocks of each group were demineralized and 5-µm thick semi-serial sections were stain with Hematoxillin and Eosin and Trichromic of Masson for histological analysis and two fragments were collected and embedded in a methacrylate-based resin and cut into slices with ~30 µm and were analyzed by light microscopy (bright field and polarized microscopy). Both groups didn’t show the spheres after 4 weeks, new-formed bone was observed from the periphery toward to the center of the surgical defect, which was even filled with connective tissue. Both materials are biocompatible, promote osteoconduction and showed to be resorbable.

Objective To compare the bond strength of two dual-cure resin cements to Ni-Cr alloy test specimens (TS), with and without surface treatment. Methods RelyX ARC and Panavia Fluoro RESUMO ObjetivoComparar a força de adesão de dois cimentos resinosos duais em liga de Ni-Cr, em corpos de prova (CP) com e sem tratamento de superfície. MétodosOs cimentos Rely-X ARC e Panavia Fluoro Cement foram testados. Oitenta CP foram fundidos em liga de níquel, nas dimensões 10mm x 7mm x 2,5mm em um total de 40 pares. Quatro grupos de CP foram obtidos. Vinte pares foram tratados com jato de alumínio de 50µm e 20 sem tratamento. Os CP foram limpos em ultrassom. As peças foram cimentadas conforme instruções dos fabricantes. O ensaio de cisalhamento foi conduzido até o momento da falha adesiva. ResultadosA análise da variância (ANOVA) mostrou que houve diferença estatística (p>0,05) entre os grupos. A análise visual das imagens de microscopia óptica mostrou um padrão de fratura mista com predomínio adesiva para o Rely-X ARC e mista com predomínio coesiva para o Panavia F. Os grupos jateados obtiveram melhor adesividade, onde o Panavia F alcançou valores maiores que o Rely-X ARC.Conclusão O grupo liga de Ni-Cr/Panavia F em superfície tratada se comportou melhor em termos de adesividade.Termos de indexação: Resinas compostas. Cimentos dentários. Resistência ao cisalhamento.