The purpose of this study was to evaluate the bond strength of metallic orthodontic brackets to feldspathic ceramic with different etching times, bonding materials and with or without silane application. Cylinders of feldspathic ceramic were etched with 10% hydrofluoric acid for 20 or 60 s. For each etching time, half of the cylinders received two layers of silane. Metallic brackets were bonded to the cylinders using Transbond XT (3M Unitek) or Fuji Ortho LC (GC). Light-activation was carried out with total exposure time of 40 s using UltraLume 5. Shear bond strength testing was performed after 24 h storage. Data were submitted to three-way ANOVA and Tukey's test (α=0.05). The adhesive remnant index (ARI) was used to evaluate the amount of adhesive remaining on the ceramic surface at ×8 magnification. Specimens etched for 60 s had significantly higher bond strength compared with 20 s. The application of silane was efficient in increasing the shear bond strength between ceramic and both fixed materials. Transbond XT showed significantly higher (p<0.05) bond strength than Fuji Orth LC. There was a predominance of ARI score 0 (clean ceramic failure surface) for all groups, with an increase in scores 1, 2 and 3 (adhesive material increasingly present on ceramic failure aspect) for the 60-s etching time. In conclusion, 60-s etching time, silane and Transbond XT improved significantly the shear bond strength of brackets to ceramic.233223227Barghi, N., Fischer, D.E., Vatani, L., Effects of porcelain leucite content, types of etchants, and etching time on porcelaincomposite bond (2006) J Esthet Restor Dent, 18, pp. 47-52. , discussion 53Nagayassu, M.P., Shintome, L.K., Uemura, E.S., Araujo, J.E., Effect of surface treatment on the shear bond strength of a resin-based cement to porcelain (2006) Braz Dent J, 17, pp. 290-295Shimada, Y., Yamaguchi, S., Tagami, J., Micro-shear bond strength of dual-cured resin cement to glass ceramics (2002) Dent Mater, 18, pp. 380-388Chen, J.H., Matsumura, H., Atsuta, M., Effect of different etching periods on the bond strength of a composite resin to a machinable porcelain (1998) J Dent, 26, pp. 53-58Gonçalves, P.R., Moraes, R.R., Costa, A.R., Correr, A.B., Nouer, P.R., Sinhoreti, M.A., Effect of etching time and light source on the bond strength of metallic brackets to ceramic (2011) Braz Dent J, 22, pp. 245-248Guler, A.U., Yilmaz, F., Yenisey, M., Guler, E., Ural, C., Effect of acid etching time and a self-etching adhesive on the shear bond strength of composite resin to porcelain (2006) J Adhes Dent, 8, pp. 21-25Novais, V.R., Simamotos Junior, P.C., Rontani, R.M., Correr-Sobrinho, L., Soares, C.J., Bond strength between fiber posts and composite resin core: Influence of temperature on silane coupling agents (2012) Braz Dent J, 23, pp. 8-14Spohr, A.M., Sobrinho, L.C., Consani, S., Sinhoreti, M.A., Knowles, J.C., Influence of surface conditions and silane agent on the bond of resin to IPS Empress 2 ceramic (2003) Int J Prosthodont, 16, pp. 277-282Brentel, A.S., Ozcan, M., Valandro, L.F., Alarca, L.G., Amaral, R., Bottino, M.A., Microtensile bond strength of a resin cement to feldpathic ceramic after different etching and silanization regimens in dry and aged conditions (2007) Dent Mater, 23, pp. 1323-1331Kitayama, S., Nikaido, T., Takahashi, R., Zhu, L., Ikeda, M., Foxton, R.M., Effect of primer treatment on bonding of resin cements to zirconia ceramic (2010) Dent Mater, 26, pp. 426-432Zachrisson, B.J., A posttreatment evaluation of direct bonding in Orthodontics (1977) Am J Orthod, 71, pp. 173-189Christensen, G.J., Dental cements: Are they the weak link (1991) J Am Dent Assoc, 122, pp. 63-64Bishara, S.E., Vonwald, L., Laffoon, J.F., Jakobsen, J.R., Effect of altering the type of enamel conditioner on the shear bond strength of a resin-reinforced glass ionomer adhesive (2000) Am J Orthod Dentofacial Orthop, 118, pp. 288-294Correr-Sobrinho, L., Correr, G.M., Consani, S., Sinhoreti, M.A., Consani, R.L., Influence of post-fixation time on shear bond strength of brackets fixed with different materials (2002) Braz Oral Res, 16, pp. 43-49Costa, A.R., Correr, A.B., Puppin-Rontani, R.M., Vedovello, S.A., Valdrighi, H.C., Correr-Sobrinho, L., Effects of thermocycling and light source on the bond strength of metallic brackets to bovine teeth (2011) Braz Dent J, 22, pp. 486-489Artun, J., Bergland, S., Clinical trials with crystal growth conditioning as an alternative to acid-etch enamel pretreatment (1984) Am J Orthod, 85, pp. 333-340della Bona, A., Shen, C., Anusavice, K.J., Work of adhesion of resin on treated lithia disilicate-based ceramic (2004) Dent Mater, 20, pp. 338-344Salvio, L.A., Correr-Sobrinho, L., Consani, S., Sinhoreti, M.A., de Goes, M.F., Knowles, J.C., Effect of water storage and surface treatments on the tensile bond strength of IPS Empress 2 ceramic (2007) J Prosthodont, 16, pp. 192-199Yen, T.W., Blackman, R.B., Baez, R.J., Effect of acid etching on the flexural strength of a feldspathic porcelain and a castable glass ceramic (1993) J Prosthet Dent, 70, pp. 224-233Ozcan, M., Vallittu, P.K., Effect of surface conditioning methods on the bond strength of luting cement to ceramics (2003) Dent Mater, 19, pp. 725-731Reynolds, I.R., A review of direct orthodontic bonding (1975) Br J Orthod, 2, pp. 171-178Chung, C.H., Cuozzo, P.T., Mante, F.K., Shear bond strength of a resinreinforced glass ionomer cement: An in vitro comparative study (1999) Am J Orthod Dentofacial Orthop, 115, pp. 52-54Bishara, S.E., Olsen, M.E., Damon, P., Jakobsen, J.R., Evaluation of a new light-cured orthodontic bonding adhesive (1998) Am J Orthod Dentofacial Orthop, 114, pp. 80-87Lippitz, S.J., Staley, R.N., Jakobsen, J.R., In vitro study of 24-hour and 30-day shear bond strengths of three resin-glass ionomer cements used to bond orthodontic brackets (1998) Am J Orthod Dentofacial Orthop, 113, pp. 620-624Sant'Anna, E.F., Monnerat, M.E., Chevitarese, O., Stuani, M.B., Bonding brackets to porcelain-in vitro study (2002) Braz Dent J, 13, pp. 191-196