Submitted: 20 Dec 2006
Accepted: 25 Feb 2013
ePublished: 25 Feb 2013
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J Iran Dent Assoc. 2006;18(2): 8-14.
  Abstract View: 20

Research

Microtensile bond strength of clearfil SE bond to caries-affected dentin and normal dentin

Amir Ghasemi*, Majid Bargrizan, Mina Mahmoodi
*Corresponding Author: Email: aghasemi@icdr.ac.ir

Abstract

Microtensile bond strength of clearfil SE bond to caries-affected dentin and normal dentin

 Dr. A. Ghasemi* - Dr. M. Bargrizan** - Dr. M. Mahmoodi***

 *- Assistant Professor of Operative Dentistry Dept. - Faculty of Dentistry – Shaheed Beheshti University of Medical Sciences.

**- Assistant Professor of Pedodontics Dept. - Faculty of Dentistry – Shaheed Beheshti University of Medical Sciences.

 ***- Dentist.

Background and Aim: Bonding systems have been traditionally used on normal dentin, even though caries-affected and sclerotic dentin are often the clinically relevant bonding substrates. A self-etching primer adhesive system (Clearfil SE Bond) was evaluated for its ability to bond to caries-affected and normal dentin.

Materials and Methods: In this experimental study, twelve extracted human primary molars with occlusal caries were selected. The enamel and superficial dentin were ground with a diamond disk and stained with a caries detector solution (propylen glycol and 1% acid red). The red-stained soft dentin which was classified as infected dentin was excavated and the affected dentin and surrounding normal dentin were polished with a 600 grit silicon carbide paper under running water to achieve a flat surface. The entire flat surface was bonded with Clearfil SE Bond (Kuraray) according to the manufacturer’s instructions and covered with composite resin Clearfil AP-X (Kuraray) to form a composite crown, approximately 4.5 mm high. The teeth were stored in distilled water at room temprature for 24 hours and were then sectioned with a diamond saw under running water in both X and Y directions, perpendicular to the bonded surface with dimensions of approximately 0.8-1 mm, so that the bonded areas of the affected or normal dentin were isolated. The obtained rods were divided into two groups: Affected and sound dentin. After measuring the cross-sectional areas at the interface, the specimens were mounted in a microtensile tester machine and pulled under tension to failure. The mode of failure was evaluated using a streomicroscope and the data were analyzed by t-test.

 Results: Statistical analysis indicated that the microtensile bond strength in affected dentin (21.53±6.52 MPa) was significantly lower (p<0.05) than normal dentin (26.98±7.31 MPa).

Conclusion: The studied self-etch system, attained lower microtensile bond strength in affected dentin as compared to normal dentin.

Key words: Microtensile - Normal dentin – Affected dentin - Primary teeth

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