Microleakage of porcelain veneer restorations bonded to enamel and dentin with a new self-adhesive resin-based dental cement

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Microleakage of porcelain veneer restorations bonded to enamel and dentin with a new self-adhesive resin-based dental cement
Dental Materials
Volume 23, Issue 2, February 2007, Pages 218-225

Gabriela Ibarra, a, Glen H. Johnson, a, Werner Geurtsen, a and Marcos A. Vargas, b
a - School of Dentistry, Department of Restorative Dentistry, University of Washington, Seattle, WA, USA
b - College of Dentistry, Department of Operative Dentistry, University of Iowa, Iowa City, USA
Received 29 September 2005; revised 19 December 2005; accepted 10 January 2006. Available online 24 February 2006.

Cementation technique of bonded ceramic restorations is a time-consuming and technique-sensitive procedure critical to long-term success.

Objective
Evaluate the performance of a self-adhesive, modified-resin dental cement (Rely-X UniCem, 3M-ESPE) for the cementation of ceramic veneer restorations without previous conditioning of the tooth surface, and in combination with a one-bottle adhesive and a self-etching adhesive.

Methods
Thirty-six premolars received a veneer preparation that extended into dentin. Leucite-reinforced pressed glass ceramic (Empress 1) veneers were cemented following manufacturersÌ instructions, according to the following treatment groups (n = 9): (1) VariolinkÒExcite IvoclarÒVivadent (V + E control), (2) Unicem + Single Bond 3M-ESPE (U + SB), (3) Unicem + Adper Prompt L-Pop 3M-ESPE (U + AP), (4) Unicem 3M-ESPE (U). After 24 h storage at 37 ?C, teeth were thermocycled (2000 cycles) at 5 and 55 ?C, immersed in ammoniacal silver nitrate for 24 h, placed in a developer solution overnight and sectioned using a slow-speed saw. Three 1 mm longitudinal sections were obtained from each tooth and evaluated for leakage with a microscope (1? to 4?). Imaging software was used to measure stain penetration along the dentin and enamel surfaces.

Results
ANOVA with SNK (α = 0.05) revealed that on dentin, U had significantly less leakage than U + SB and U + AP, but no different than V + E; on enamel U had leakage values that were significantly greater than the groups with adhesives.

Significance
The self-adhesive cement U gave low leakage on dentin that was comparable to the cement that employed an adhesive for sealing dentin, whereas this cement benefits from use of an adhesive when cementing to enamel.

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