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Bonding of auto-adhesive cements to discolored dentin after amalgam removal

Objectives: To evaluate the bond strengths of a conventional and an auto-adhesive resin cement to discolored dentin beneath amalgam restorations. Methods: Twenty amalgam-filled extracted human teeth were used. After the removals of amalgam, flat surfaces of discolored dentin surrounded by sound dentin were bonded with a conventional (Panavia F / Kuraray) or with an auto adhesive (RelyX Unicem / 3M ESPE) resin cement according to the manufacturer's instructions. Trimmed resin-dentin bonded interfaces (1 mm2) were stored in distilled water for 24 h and subjected to microtensile bond strength (µTBS) evaluation. Specimens stressed in tension at 0.5 mm/min. Data were analyzed by 2-way ANOVA and Tukey test (α=0.05). Results: Mean µTBS and standard deviations are listed (MPa). Within the same column, identical letters indicate no differences (P<0.05).

 

Sound dentin

Discolored dentin

Panavia F

17.8 (7.8) A

14.5 (6.7) A

RelyX Unicem

11.0 (4.5) B

9.9 (3.7) B

The resin bond to dentin was not affected by the type of dentin (P=.171) but was affected by the cement (P<.001). µTBS of Panavia F was significantly higher than that to RelyX Unicem for both dentin types. Irrespective the luting agent used, no differences were found between bond strengths to sound and discolored dentin. Conclusions: As compared to sound dentin, there were not remarkable differences in interfacial bond strength to discolored dentin when luting with resin-based cements. The conventional resin cement remains as a standard in terms of resin-dentin bonds quality.


Division: Pan European Federation Meeting
Meeting: 2008 Pan European Federation Meeting (London, England)
Location: London, England
Year: 2008
Final Presentation ID: 47
Abstract Category|Abstract Category(s): PEF IADR 2008
Authors
  • Pisani-proenca, Jatyr  ( University of Granada, Granada, N/A, Spain )
  • Erhardt, Maria Carolina Guilherme  ( University of Granada, Granada, N/A, Spain )
  • Valandro, Luiz Felipe  ( Federal University of Santa Maria, Santa Maria, N/A, Brazil )
  • Salmerón, Ramón. Del Castillo  ( University of Granada, Granada, N/A, Spain )
  • González-lópez, Santiago  ( University of Granada, Granada, N/A, Spain )
  • Bolaños-carmona, Maria Victoria  ( University of Granada, Granada, N/A, Spain )
    • SESSION INFORMATION
    Poster Session
    Adhesion/Dentin/Luting/Siloranes
    09/10/2008