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Adhesion on collagen-depleted dentin

 
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vjau



Joined: 08 Jul 2009
Posts: 76

PostPosted: Wed Aug 05, 2009 8:49 am    Post subject: Adhesion on collagen-depleted dentin Reply with quote

J Adhes Dent. 2008 Dec;10(6):419-22.
Adhesion of a two-step etch-and-rinse adhesive on collagen-depleted dentin.
Saboia VP, Nato F, Mazzoni A, Orsini G, Putignano A, Giannini M, Breschi L.

Department of Restorative Dentistry, Federal University of Ceará, Fortaleza, Brazil.

PURPOSE: To evaluate microtensile bond strength and interfacial nanoleakage expression of adhesive interfaces created by XP-Bond on human deproteinized dentin immediately after bonding and after 6 months of artificial aging. MATERIALS AND METHODS: Noncarious human molars were selected, middle/deep dentin substrates were exposed, and either assigned to group 1 (XP-Bond applied on collagen-depleted dentin) or to group 2 (XP-Bond applied in accordance with manufacturers' instructions). In group 1, the etched dentin surface was treated with 10% NaOCl for 60 s to remove the exposed demineralized organic matrix before XP-Bond application. Composite/dentin beams were obtained in accordance with the microtensile nontrimming technique and either pulled to failure after 24 h or after 6 months' artificial aging. Data were analyzed with two-way ANOVA and Tukey's post-hoc test (p < 0.05). Interfacial nanoleakage evaluation was performed on additional adhesive interfaces to quantify the amount of silver tracer along the interface. RESULTS: The use of NaOCI before XP-Bond application (group 1: 18.9 +/- 5.8 MPa) reduced immediate bond strength by 62% compared to controls (group 2: 49.9 +/- 10.3 MPa; p < 0.5). After 6 months of artificial aging, the bond strength of groups 1 and 2 significantly decreased to 10.1 +/- 2.7 MPa and 35.2 +/- 8.7 MPa, resp (p < 0.05). Interfacial nanoleakage expression along XP-Bond adhesive interfaces was increased either by sodium hypochlorite or by artificial aging. CONCLUSION: The role of collagen fibrils is pivotal for the bonding of XP-Bond to dentin, as decreased immediate bond strength and reduced bond stability over time was found on collagen-depleted dentin.

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Does it means that bonded cores after RCT is not a good idea ? Should we treat somewhat the surface prior to bonding ?
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Fri Aug 07, 2009 4:50 pm    Post subject: Reply with quote

The short answer is use Surpass. I cannot go into too much detail because I am on a ship.
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