A STUDY OF HUMIDITY AND ITS EFFECT ON BOND STRENGTH: WHAT DOES IT DO AND WHAT CAN WE DO ABOUT IT?

Authors

Michael J. Melkers, DDS, FAGD

Study Presented at World Congress of Minimally Invasive Dentistry

San Francisco, California August 13, 2004.

This study was conducted with two objectives in mind:

1)To determine the effect of 100% humidity on bond strength;

2)To determine the efficacy of rubber dam and a new isolation device (Isolite by Isolitesystem - USA) onreducing intra-oral humidity levels. The study concluded that under the conditions of this study, application of the dentin bonding agent and placement of the composite resin in the presence of high humidity significantly reduced the mean bond strength to dentin. The clinical significance of this finding is that reducing humidity is important for generating optimum bond strengths to dentinal surfaces.

*A Study ofHumidity and Its Effect on Bond Strength by MichaelJ. Melkers,DDS, FAGD

Key Study Points & Findings

1.The study found that reducing oral humidity is important for generating optimum bond strengths to dentinal surfaces;

2.Under the conditions of this study, both rubber dam and Isolite isolation were found to significantly reduce the relative intra-oral humidity;

3.Under the conditions of this study, average intra-oral humidity with Isolite was reduced at a level equal to, or slightly better than, that achieved with rubber dam isolation;

4.Under the conditions of this study, Isolite was found to be effective in isolation and humidity reduction. Isolite was also found to be versatile for a variety of dental applications;

5.The Primary Investigator (PI) observed that the use of Isolite delivers predictable, practical results which  facilitates 20% - 30% faster procedures.

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