Volume 33, Issue 1 pp. 88-98
RESEARCH ARTICLE

Significance of immediate dentin sealing and flowable resin coating reinforcement for unfilled/lightly filled adhesive systems

Marco Aurélio de Carvalho DDS, MSc, PhD

Marco Aurélio de Carvalho DDS, MSc, PhD

Department of Oral Rehabilitation, School of Dentistry, University of Anápolis, Anápolis, Brazil

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Priscilla Cardoso Lazari-Carvalho DDS, MSc, PhD

Corresponding Author

Priscilla Cardoso Lazari-Carvalho DDS, MSc, PhD

Department of Oral Rehabilitation, School of Dentistry, University of Anápolis, Anápolis, Brazil

Correspondence

Priscilla Cardoso Lazari-Carvalho, Department of Oral Rehabilitation, School of Dentistry, University of Anápolis, Anápolis, Brazil.

Email: [email protected]

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Isabella Fonseca Polonial DDS, MSc

Isabella Fonseca Polonial DDS, MSc

Department of Prevention and Oral Rehabilitation, School of Dentistry, University of Goiás, Goiânia, Brazil

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João Batista de Souza DDS, MSc, PhD

João Batista de Souza DDS, MSc, PhD

Department of Prevention and Oral Rehabilitation, School of Dentistry, University of Goiás, Goiânia, Brazil

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Pascal Magne DMD, MSc, PhD

Pascal Magne DMD, MSc, PhD

The Don & Sybil Harrington Professor of Esthetic Dentistry, Division of Restorative Sciences, Ostrow School of Dentistry, University of Southern California, Los Angeles, California, USA

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First published: 06 January 2021
Citations: 37

Funding information: Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant/Award Number: 150054/2018-1

Abstract

Background

Immediate dentin sealing implies applying an adhesive system to dentin directly after tooth preparation, before impression. The technique is universal (inlays, onlays, veneers, crowns) and well documented clinically and experimentally. Different types of dentin bonding agents (DBAs) are available on the market. Major differences lie in the thickness of the hybrid layer and overlaying adhesive resin (filled vs. unfilled/lightly filled adhesives).

Objective

The objective of this work is to provide precise clinical instructions and present new experimental data about the bond strength of five DBAs (Optibond FL, Scotchbond MP, Single Bond Plus, Clearfil SE Bond, and Scotchbond Universal) used conventionally (dentin sealed at the time of restoration delivery) or with immediate dentin sealing, as well as with an additional flowable resin coating.

Methods

Seventy-five human molars were selected, restored/tested according the microtensile bond strength method. Fifteen groups (n=5) were obtained from the combination of the five DBAs and three application modes: delayed dentin sealing, immediate dentin sealing and immediate dentin sealing with flowable resin coating.

Results

It appears that immediate dentin sealing was confirmed to significantly improve the bond strength of all tested adhesives. The use of a flowable resin coating reinforcement after immediate dentin sealing increased the microtensile bond strength of all unfilled/lightly filled adhesives (from 233% of increase for ScotchBond MP, up to 560% for Clearfil SE Bond) and maintained the performance of the 3-step golden standard adhesive. Optibond FL used with (52.51 MPa) or without (54.75 MPa) additional flowable resin coating and Clearfil SE Bond (45.64 MPa) used with flowable resin coating provided the best results.

Clinical Significance

The original immediate dentin sealing (IDS) technique implies the use of a filled DBA. With unfilled/lightly filled adhesives, it is suggested to reinforce IDS with an additional flowable resin coating. This seems especially paramount to the performance of simplified adhesive systems to protect the thin bonding interface from oxygen inhibition and preserve IDS layer during predelivery cleaning of the preparation. The clinical reinforcement of unfilled/lightly filled IDS with flowable resin composite is encouraged for more predictable bonding.

DATA AVAILABILITY STATEMENT

Data available on request from the authors.

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