Journal of Prosthetic Dentistry
Research Article| Volume 103, ISSUE 6, P369-379, June 2010

Evaluation of a one-piece milled zirconia post and core with different post-and-core systems: An in vitro study

      Statement of problem

      One-piece milled zirconia posts and cores present an esthetic option as foundation restorations for ceramic crowns. To date, dimensional fit and load capacity of 1-piece zirconia posts and cores have not been determined.


      The purpose of this study was to evaluate the accuracy of fit of milled zirconia posts and cores and to compare the shear strength with other post-and-core systems.

      Material and methods

      Eighty-five maxillary central incisors and canines received endodontic treatment and were divided into 5 groups (n=17) as follows: cast gold post and core (Au) as control, 1-piece milled zirconia post and core (Zr), prefabricated zirconia post with heat-pressed ceramic core (Zr/Cer), titanium post and composite resin core (Ti), and combined fiber/zirconia post with composite resin core (Fiber/Zr). The posts and cores were cemented with dual-polymerized composite resin cement (Multilink). Zirconia copings were made for each specimen, cemented, and loaded to failure. Fracture loads and modes of failure were recorded. Fracture loads were compared with a linear model. Differences in the mean marginal gap distance between the post-and-core patterns and the adjusted milled zirconia posts and cores were analyzed with a paired t test (α=.05).


      A significant difference was found in the marginal gap distance of group Zr (P<.001), compared with the marginal gap distance of the acrylic resin patterns. Mean loads to failure were highest for the Fiber/Zr group in comparison with custom-made milled zirconia posts and cores (P<.001).


      All systems evaluated presented sufficient mean load-to-failure values for anterior tooth restorations, including the recently developed 1-piece milled zirconia post and core. (J Prosthet Dent 2010;103:369–379)
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        • Bergman B
        • Lundquist P
        • Sjögren U
        • Sundquist G
        Restorative and endodontic results after treatment with cast posts and cores.
        J Prosthet Dent. 1989; 61: 10-15
        • Creugers NH
        • Mentink AG
        • Käyser AF
        An analysis of durability data on post and core restorations.
        J Dent. 1993; 21: 281-284
        • Carossa S
        • Lombardo S
        • Pera P
        • Corsalini M
        • Rastello ML
        • Preti PG
        Influence of posts and cores on light transmission through different all-ceramic crowns: spectrophotometric and clinical evaluation.
        Int J Prosthodont. 2001; 14: 9-14
        • Deger S
        • Akgüngör G
        • Caniklioglu B
        An alternative method for fabricating a custom-made metal post with a ceramic core.
        Dent Traumatol. 2005; 21: 179-182
        • Vichi A
        • Ferrari M
        • Davidson CL
        Influence of ceramic and cement thickness on the masking of various types of opaque posts.
        J Prosthet Dent. 2000; 83: 412-417
        • Nakamura T
        • Saito O
        • Fuyikawa J
        • Ishigaki S
        Influence of abutment substrate and ceramic thickness on the colour of heat-pressed ceramic crowns.
        J Oral Rehabil. 2002; 29: 805-809
        • Michalakis KX
        • 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
        • Plasmans PJ
        • Visseren LG
        • Vrijhoef MM
        • Kayser AF
        In vitro comparison of dowel and core techniques for endodontically treated molars.
        J Endod. 1986; 12: 382-387
        • Meyenberg KH
        • Lüthy H
        • Schärer P
        Zirconia posts: a new all-ceramic concept for nonvital abutment teeth.
        J Esthet Dent. 1995; 7: 73-80
        • Sirimai S
        • Riis DN
        • Morgano SM
        An in vitro study of the fracture resistance and the incidence of vertical root fracture of pulpless teeth restored with six post-and-core systems.
        J Prosthet Dent. 1999; 81: 262-269
        • Käyser AF
        • Leempoel PJ
        • Snoek PA
        The metal post and composite core combination.
        J Oral Rehabil. 1987; 14: 3-11
        • Assif D
        • Gorfil C
        Biomechanical considerations in restoring endodontically treated teeth.
        J Prosthet Dent. 1994; 71: 565-567
        • Fraga RC
        • Chaves BT
        • Mello GS
        • Siqueira Jr, JF
        Fracture resistance of endodontically treated roots after restoration.
        J Oral Rehabil. 1998; 25: 809-813
        • Fernandes AS
        • Shetty S
        • Coutinho I
        Factors determining post selection: a literature review.
        J Prosthet Dent. 2003; 90: 556-562
        • Segerström S
        • Astbäck J
        • Ekstrand KD
        A retrospective long term study of teeth restored with prefabricated carbon fiber reinforced epoxy resin posts.
        Swedish Dent J. 2006; 30: 1-8
        • Reagan SE
        • Fruits TJ
        • Van Brunt CL
        • Ward CK
        Effects of cyclic loading on selected post-and-core systems.
        Quintessence Int. 1999; 30: 61-67
        • Awad MA
        • Marghalani TY
        Fabrication of a custom-made ceramic post and core using CAD-CAM technology.
        J Prosthet Dent. 2007; 98: 161-162
        • Rosentritt M
        • Sikora M
        • Behr M
        • Handel G
        In vitro fracture resistance and marginal adaptation of metallic and tooth-coloured post systems.
        J Oral Rehabil. 2004; 31: 675-681
        • Mannocci F
        • Ferrari M
        • Watson TF
        Intermittent loading of teeth restored using quartz fiber, carbon-quartz fiber, and zirconium dioxide ceramic root canal posts.
        J Adhes Dent. 1999; 1: 153-158
        • Butz F
        • Lennon AM
        • Heydecke G
        • Strub JR
        Survival rate and fracture strength of endodontically treated maxillary incisors with moderate defects restored with different post-and-core systems: an in vitro study.
        Int J Prosthodont. 2001; 14: 58-64
        • Olivia RA
        • Lowe JA
        Dimensional stability of composite used as a core material.
        J Prosthet Dent. 1986; 576: 554-561
        • Kovarik RE
        • Breeding LC
        • Caughman WF
        Fatigue life of three core materials under simulated chewing conditions.
        J Prosthet Dent. 1992; 68: 584-590
        • Rosenstiel SF
        • Land MF
        • Fujimoto J
        Contemporary fixed prosthodontics. 4th ed. Elsevier, St Louis2006: 336-378
        • Stricker EJ
        • Göhring TN
        Influence of different posts and cores on marginal adaptation, fracture resistance, and fracture mode of composite resin crowns on human mandibular premolars. An in vitro study.
        J Dent. 2006; 34: 326-335
        • Kwiatkowski S
        • Geller W
        A preliminary consideration of the glass-ceramic dowel post and core.
        Int J Prosthodont. 1989; 2: 51-55
        • Fernandes AS
        • Dessai GS
        Factors affecting the fracture resistance of post-core reconstructed teeth: a review.
        Int J Prosthodont. 2001; 14: 355-363
        • Rosentritt M
        • Fürer C
        • Behr M
        • Lang R
        • Handel G
        Comparison of in vitro fracture strength of metallic and tooth-coloured posts and cores.
        J Oral Rehabil. 2000; 27: 595-601
        • Bakke M
        • Holm B
        • Jensen BL
        • Michler L
        • Möller E
        Unilateral, isometric bite force in 8 68 year-old women and men related to occlusal factors.
        Scand J Dent Res. 1990; 98: 149-158
        • Streacker AB
        • Geissberger M
        The milled ceramic post and core: a functional and esthetic alternative.
        J Prosthet Dent. 2007; 98: 486-487
        • R Development Core Team
        R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing.
        (Accessed on February 18, 2008)
        • Heintze SD
        • Cavalleri A
        • Zellweger G
        • Büchler A
        • Zappini G
        Fracture frequency of all-ceramic crowns during dynamic loading in a chewing simulator using different loading and luting protocols.
        Dent Mater. 2008; 24: 1352-1361