Effect of simulated pulpal pressure on self-adhesive cements bonding to dentin

Mazzitelli, Claudia; Monticelli, Francesca; Osorio, Raquel; Casucci, Alessio; Toledano, Manuel; Ferrari, Marco

doi:10.1016/j.dental.2008.01.005

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Volume 24, Issue 9 , Pages 1156-1163, September 2008

Effect of simulated pulpal pressure on self-adhesive cements bonding to dentin

Claudia Mazzitelli
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, 53100 Siena, Italy
Francesca Monticelli
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, 53100 Siena, Italy
- Department of Dental Materials, School of Dentistry, University of Granada, Granada, Spain
Raquel Osorio
- Department of Dental Materials, School of Dentistry, University of Granada, Granada, Spain
Alessio Casucci
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, 53100 Siena, Italy
Manuel Toledano
- Department of Dental Materials, School of Dentistry, University of Granada, Granada, Spain
Marco Ferrari
- Department of Dental Materials and Restorative Dentistry, Policlinico “Le Scotte”, University of Siena, Viale Bracci, 53100 Siena, Italy
- Corresponding author. Tel.: +39 0577233131; fax: +39 0577233117.

Received 25 August 2007; received in revised form 30 December 2007; accepted 7 January 2008.

Abstract

Objectives

To evaluate the bonding effectiveness of self-adhesive luting cements to dentin in the presence of simulated hydrostatic intrapulpal pressure (PP).

Methods

Thirty composite overlays (Aelite All Purpose Body) were luted to deep-coronal dentin surfaces using four self-adhesive resin cements (Rely X Unicem, G-Cem, Multilink Sprint, Bis-Cem) and one total-etch system (Calibra). Half of the specimens resin cements were applied under a PP of 15cm H₂O. After storage in a moist condition for 1 month (37°C, 100% relative humidity), specimens were sectioned into microtensile beams (1mm²) and stressed to failure with the microtensile bond strength test (μTBS). Data were statistically analyzed with Kruskal–Wallis ranking (p<0.05) and Mann–Whitney tests (p<0.001). The fracture pattern was evaluated under SEM.

Results

Bond strength of Calibra fell significantly when PP was applied during bonding (p<0.05). Rely X Unicem and Bis-Cem performed better under PP. No significant differences for Multilink Sprint and G-Cem bonded specimens were recorded with or without PP.

Significance

Simulated PP influences the adhesive performance of resinous cements. The predominance of acid–base reactions or radical polymerization may explain the different behavior of self-adhesive cements when changing substrate wetness. The application of constant intrapulpal perfusion should be considered when simulating luting procedures in vitro.

Keywords: Self-adhesive cement, Pulpal pressure, Permeability, Dentinal fluid, Hydrophilic polymers