Durability of four composite resin cements bonded to dentin under simulated pulpal pressure

Lin, Jun; Mehl, Christian; Yang, Bin; Kern, Matthias

doi:10.1016/j.dental.2010.06.004

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Volume 26, Issue 10 , Pages 1001-1009, October 2010

Durability of four composite resin cements bonded to dentin under simulated pulpal pressure

Jun Lin
- Department of Stomatology, First Affiliated Hospital, Faculty of Dentistry, Zhejiang University, Qin Chun Road 79, Hangzhou, China
Christian Mehl
- Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University at Kiel, Arnold-Heller-Straße 16, 24105 Kiel, Germany
- Corresponding author at: Private Practice, 10 Brook Street, W1S 1BG, London, United Kingdom. Tel.: +44 845 0944004; fax: +44 845 0943003.
Bin Yang
- Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University at Kiel, Arnold-Heller-Straße 16, 24105 Kiel, Germany
Matthias Kern
- Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian-Albrechts University at Kiel, Arnold-Heller-Straße 16, 24105 Kiel, Germany

Received 24 September 2009; received in revised form 4 May 2010; accepted 10 June 2010.

Abstract

Objectives

This study aimed to investigate the durability of four adhesive luting systems bonded to dentin with and without simulated hydrostatic pulpal pressure (PP).

Methods

Composite blocks were bonded to dentin with four adhesive systems: Multilink Automix (MA), Multilink Sprint (MS), Clearfil Esthetic cement (CE) and RelyX ARC (RAC) under either a PP of 0 or 15cm H₂O. After 3d water storage at 37°C or thermal cycling (TC), of 30d with 5000 TC or 90d with 15,000 TC micro-tensile bond strength (μTBS) was tested. Failure analysis of the bonding interface was performed using a scanning electron microscope (SEM).

Results

Independent of PP application groups MA and RAC showed significantly higher μTBS than CE and MS (P≤0.05). A significant decrease in μTBS was found for RAC and MS when subjected to PP (P≤0.05), whereas CE and MA showed no significant difference (P>0.05). TC had no significant influence on the μTBS in RAC, MA and CE without PP application (P>0.05), whereas CE with PP and MS showed a significant decrease in μTBS (P≤0.05) when subjected to TC.

Significance

Based on these results, there were significant differences between materials. Pulpal pressure and artificial aging also seem to have an effect on in-vitro evaluation of bonding durability. If considered relevant to the materials’ service performance then these conditions should be applied in the materials’ testing.

Keywords: Adhesion, Micro-tensile bond strength, Pulpal pressure, SEM, Hydrostatic pressure, Surface properties, Dentin