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Immediate dentin sealing supports delayed restoration placement.

Pascal Magne¹, Woong-Seup So, Domenico Cascione

¹Division of Primary Oral Health Care, University of Southern California, School of Dentistry, Los Angeles, CA 90089, USA. magne@usc.edu

The Journal of Prosthetic Dentistry

|September 15, 2007

Summary

Immediate dentin sealing (IDS) maintains strong dentin bond strength for indirect restorations, even after 12 weeks. This technique ensures reliable bonding of resin-coated dentin to final restorations.

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Area of Science:

Dental Materials Science
Adhesive Dentistry
Restorative Dentistry

Background:

Immediate dentin sealing (IDS) is an innovative technique for indirect restorations, involving sealing dentin immediately after tooth preparation before impression making.
The long-term efficacy of bonding to resin-coated dentin after provisional restoration placement remains unclear.

Purpose of the Study:

To evaluate microtensile bond strength to human dentin using the IDS technique with varying delays (2, 7, and 12 weeks) before definitive restoration.
To compare two different dentin bonding agents (DBAs) and incorporate previously published IDS data.

Main Methods:

Fifty human molars were divided into groups using a 3-step etch-and-rinse (Optibond FL) and a 2-step self-etching (SE Bond) DBA.
Control groups received direct immediate bonding, while experimental groups utilized delayed dentin sealing (DDS) or immediate dentin sealing (IDS) with provisional restorations for 2, 7, or 12 weeks.

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Microtensile bond strength (MTBS) was tested 24 hours after definitive restoration, with data analyzed using two-way ANOVA.

Main Results:

All IDS groups and control groups exhibited comparable microtensile bond strengths exceeding 45 MPa.
Delayed dentin sealing (DDS) groups showed significantly lower bond strengths compared to IDS and control groups.
Optibond FL demonstrated higher bond strengths than SE Bond at 7 and 12 weeks, with IDS-7W and IDS-12W failures occurring between the IDS resin and overlaying composite.

Conclusions:

Immediate dentin sealing (IDS) with either etch-and-rinse or self-etching DBAs yields microtensile bond strength comparable to immediate adhesive placement.
The bond strength achieved through IDS is not adversely affected by delays of up to 12 weeks before definitive restoration placement.