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Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives

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Published on: May 17, 2020

Does the universal adhesive's film thickness affect dentin-bonding effectiveness?

Chuliang Tang¹, Ben Mercelis¹, Kumiko Yoshihara^2,3

¹KU Leuven (University of Leuven), Department of Oral Health Sciences, BIOMAT - Biomaterials Research Group & UZ Leuven (University Hospitals Leuven), Dentistry, Kapucijnenvoer 7 blok a - bus 7001, Leuven, 3000, Belgium.

Clinical Oral Investigations

|February 15, 2024

Summary

Proper air-blowing of universal adhesives (UA) is crucial for optimal bond strength in high C-factor cavities. Gentle air-blowing ensures better film thickness and bond effectiveness, while improper techniques can compromise restoration longevity.

Keywords:

Adhesive Bonding Class I Durability Interface

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Published on: December 20, 2024

Area of Science:

Dental Materials Science
Adhesive Dentistry
Biomaterials Engineering

Background:

Universal adhesives (UA) are widely used in self-etch (SE) bonding modes.
High C-factor cavities present challenges for achieving optimal bond strength.
Adhesive resin film thickness is a critical factor influencing bond performance.

Purpose of the Study:

To evaluate how different adhesive resin application methods affect film thickness.
To determine the impact of these methods on the bond strength of a two-step UA in high C-factor cavities.
To assess the influence of aging on bond strength under various application conditions.

Main Methods:

Four application modalities of a two-step UA were tested on human molars.
Adhesive resin film thickness was measured using optical microscopy.
Micro-tensile bond strength (μTBS) was assessed immediately and after thermocycling.

Main Results:

Gentle air-blowing resulted in significantly higher immediate μTBS compared to strong air-blowing or no air-blowing.
No significant difference in μTBS was observed between single or double gently air-blown applications.
Adhesive resin film thickness varied significantly based on the application modality.

Conclusions:

Both excessively thin and thick adhesive resin films negatively impact bond strength in high C-factor cavities.
Proper air-blowing technique is essential for maximizing the bonding performance of two-step UAs.
Clinicians should adhere strictly to manufacturer instructions for UA application to ensure reliable bonding.