Journal of Prosthetic Dentistry
Research Article| Volume 95, ISSUE 3, P224-229, March 2006

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Effect of silica coating and silanization on flexural and composite-resin bond strengths of zirconia posts: An in vitro study

      Statement of problem

      The bond strength of composite resin cores to the smooth surface of prefabricated zirconia-based ceramic posts is problematic because it might not be sufficient to ensure stability of the post-and-core system. It is also not clear whether any alteration of the post surface to provide additional mechanical or chemical retention would compromise flexural strength of the posts.


      This study tested the effect of a tribochemical treatment on the bond strength (BS) between zirconia-based ceramic posts and composite resin and on the flexural strength (FS) of the posts.

      Material and methods

      For the BS test, 2 groups of specimens (n=10) were prepared as follows: In the experimental (E) group, zirconia-based ceramic posts (Cosmopost), 21 mm long and 1.7 mm in diameter, were treated with a tribochemical silica coating and silanization system (Rocatec). For the control (C) group, zirconia-based ceramic posts were used as supplied by the manufacturer. For the 2 groups, posts were centered and vertically positioned in a metal mold, and composite resin (Tetric Ceram) was polymerized around the posts to form rings (6 mm diameter × 4 mm height). All specimens were positioned in a universal testing machine, and a load was applied axially on the protruding heads of posts in a shear push-out mode test until bond failure (MPa). Fracture mode was assessed as cohesive, cohesive/adhesive, or adhesive. Following this, the FS of the posts was measured in MPa using a 3-point bending test. Data were recorded and statistically analyzed using the Student t test for both tests (α=.01).


      Mean fracture load values ± SDs for the BS test were 28.1 ± 2.3 MPa and 8.9 ± 3.97 MPa for the E and C groups, respectively. The mean FS values were 1544.9 ± 214.1 MPa and 844.8 ± 50.8 MPa for the E and C groups, respectively. The tribochemically treated posts exhibited significantly higher values for both bond strength to composite resin and resistance to fracture when compared to posts in the control group (P<.001). Fracture analysis showed 100% cohesive/adhesive fractures for group E specimens and 100% adhesive fractures for group C specimens.


      The use of a tribochemical silica coating process and silanization on zirconia-based ceramic posts increased both the bond strength to composite resin as well as the fracture strength of posts.
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        • Paul S.J.
        • Pietrobon N.
        • Scharer P.
        The new In-Ceram Spinell system—a case report.
        Int J Periodontics Restorative Dent. 1995; 15: 520-527
        • Kakehashi Y.
        • Luthy H.
        • Naef R.
        • Wohlwend A.
        • Scharer P.
        A new all-ceramic post and core system: clinical, technical and in vitro results.
        Int J Periodontics Restorative Dent. 1998; 18: 586-593
        • McLaren E.A.
        • White S.N.
        Survival of In-Ceram crowns in a private practice: a prospective clinical trial.
        J Prosthet Dent. 2000; 83: 216-222
        • Ahmad I.
        Yttrium–partially stabilized zirconium dioxide posts: an approach to restoring coronally compromised nonvital teeth.
        Int J Periodontics Restorative Dent. 1998; 18: 45-66
        • Gemalmaz D.
        • Ergin S.
        Clinical evaluation of all-ceramic crowns.
        J Prosthet Dent. 2002; 87: 189-196
        • Koutayas S.O.
        • Kern M.
        All-ceramic posts and cores: the state of the art.
        Quintessence Int. 1999; 30: 383-392
        • Michalakis K.X.
        • Hirayama H.
        • Sfolkos J.
        • Sfolkos K.
        Light transmission of posts and cores used for the anterior esthetic region.
        Int J Periodontics Restorative Dent. 2004; 24: 462-469
        • Paul S.J.
        • Werder P.
        Clinical success of zirconium oxide posts with resin composite or glass-ceramic cores in endodontically treated teeth: a 4-year retrospective study.
        Int J Prosthodont. 2004; 17: 524-528
        • Oblak C.
        • Jevnikar P.
        • Kosmac T.
        • Funduk N.
        • Marion L.
        Fracture resistance and reliability of new zirconia posts.
        J Prosthet Dent. 2004; 91: 342-348
        • Picconi C.
        • Maccauro G.
        Zirconia as a ceramic biomaterial.
        Biomaterials. 1999; 20: 1-25
        • Guazzato M.
        • Albakry M.
        • Ringer S.P.
        • Swain M.V.
        Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part II. Zirconia-based dental ceramics.
        Dent Mater. 2004; 20: 449-456
        • Kosmac T.
        • Oblak C.
        • Jevnikar P.
        • Funduk N.
        • Marion L.
        The effect of surface grinding and sandblasting on flexural strength and reliability of Y-TZP zirconia ceramic.
        Dent Mater. 1999; 15: 426-433
        • Fischer H.
        • Rentzsch W.
        • Marx R.
        Elimination of low-quality ceramic posts by proof testing.
        Dent Mater. 2002; 18: 570-575
        • Blatz M.B.
        • Sadan A.
        • Kern M.
        Resin-ceramic bonding: a review of the literature.
        J Prosthet Dent. 2003; 89: 268-274
        • Al-harbi F.
        • Nathanson D.
        In vitro assessment of retention of four esthetic dowels to resin core foundation and teeth.
        J Prosthet Dent. 2003; 90: 547-555
        • Cohen B.I.
        • Pagnillo M.K.
        • Newman I.
        • Musikant B.L.
        • Deutsch A.S.
        Retention of core material supported by three post head designs.
        J Prosthet Dent. 2000; 83: 624-628
        • Dietschi D.
        • Romelli M.
        • Goretti A.
        Adaptation of adhesive posts and cores to dentin after fatigue testing.
        Int J Prosthodont. 1997; 10: 498-507
        • Yaman P.
        • Thorsteinsson T.S.
        Effect of core materials on stress distribution of posts.
        J Prosthet Dent. 1992; 68: 416-420
        • Nergiz I.
        • Schmage P.
        • Plazter U.
        • McMullan-Vogel C.G.
        Effect of different surface textures on retentive strength of tapered posts.
        J Prosthet Dent. 1997; 78: 451-457
        • Mannocci F.
        • Bertelli E.
        • Sherriff M.
        • Watson T.F.
        • Ford T.R.
        Three-year clinical comparison of survival of endodontically treated teeth restored with either full cast coverage or with direct composite restoration.
        J Prosthet Dent. 2002; 88: 297-301
        • Della Bona A.
        • Anusavice K.J.
        • Hood J.A.
        Effect of ceramic surface treatment on tensile bond strength to a resin cement.
        Int J Prosthodont. 2002; 15: 248-253
        • Della Bona A.
        • Shen C.
        • Anusavice K.J.
        Work of adhesion of resin on treated lithia disilicate-based ceramic.
        Dent Mater. 2004; 20: 338-344
        • Stangel I.
        • Nathanson D.
        • Hsu C.S.
        Shear strength of the composite bond to etched porcelain.
        J Dent Res. 1987; 66: 1460-1465
        • Hooshmand T.
        • van Noort R.
        • Keshvad A.
        Bond durability of the resin-bonded and silane treated ceramic surface.
        Dent Mater. 2002; 18: 179-188
        • Madani M.
        • Chu F.C.S.
        • McDonald A.V.
        • Smales R.J.
        Effects of surface treatments on shear bond strengths between a resin cement and an alumina core.
        J Prosthet Dent. 2000; 83: 644-647
        • Kern N.
        • Thompson V.P.
        Bonding to glass-infiltrated alumina ceramic: adhesive methods and their durability.
        J Prosthet Dent. 1995; 73: 240-249
        • Blixt M.
        • Adamczak E.
        • Linden L.
        • Oden A.
        • Arvidson K.
        Bonding to densely sintered alumina surfaces: effect of sandblasting and silica coating on shear bond strength of luting cements.
        Int J Prosthodont. 2000; 13: 221-226
        • Awliya W.
        • Oden A.
        • Yaman P.
        • Dennison J.B.
        • Razzoog M.E.
        Shear bond strength of a resin cement to densely sintered high-purity alumina with various surface conditions.
        Acta Odontol Scand. 1998; 56: 9-13
        • Ozcan M.
        • Alkumru H.N.
        • Gemalmaz D.
        The effect of the surface treatment on the shear bond strength of luting cement to glass-infiltrated alumina ceramic.
        Int J Prosthodont. 2001; 14: 335-339
        • Wegner S.M.
        • Kern M.
        Long-term resin bond strength to zirconia ceramic.
        J Adhes Dent. 2000; 2: 139-147
        • Rueggeberg F.A.
        • Jordan D.M.
        Effect of light-tip distance on polymerization of resin composite.
        Int J Prosthodont. 1993; 6: 364-370