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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

Summer 2004
Volume 6 , Issue 2



Pages: 105-110
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Evaluation of Etching Time on Dentin Bond Strength Using Single Bottle Bonding Systems

Abu-Hanna, Amer/Gordan, Valeria V.

Incomplete infiltration of the demineralized collagen network may result in a weak zone within the hybrid layer and between the hybrid layer and dentin. The current study evaluates whether reducing the etching time to 5 s from the recommended 15 s or increasing it to 30 s has an effect on dentin bonding. 108 extracted molars were assigned to 3 bonding agent groups (n = 36): (a) Single Bond (SB), (b) One-Step (OS), and (c) Syntac Single Component (SSC). Each group was further divided into three subgroups (n = 12) of different etching times: 5, 15, and 30 s. All groups were bonded with Z100 composite resin according to the manufacturer’s instructions. All specimens were thermocycled 300 times between 5C and 55C, and shear bond strength testing and mode of failure analysis were performed. The bond strength of SB (5 s: 15.5 MPa 4.4; 15 s: 16.5 MPa 3.1; 30 s: 16.8 MPa 3.2) and OS (5 s: 13.7 MPa 1.8; 15 s: 12.4 MPa 3.8; 30 s: 10.6 MPa 3.8) showed no significant differences (p < 0.05) for the different etching times. For SSC, different etching times showed significant differences (5 s: 10.9 MPa 1.8; 15 s: 7.5 MPa 2.5; 30 s: 6.4 MPa 2.1). The mode of failure for SB and OS was adhesive or mixed adhesive/cohesive. For SSC, all failures were adhesive. Etching times of less than 15 s do not seem to adversely affect bonding to dentin.

Keywords: etching time, dentin, shear bond strength, adhesion, single-component adhesive systems, dental materials

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