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Updated: Jun 1, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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Nanoleakage distribution at adhesive-dentin interfaces in 3D.

E Coutinho¹, M V Cardoso, C P Fernandes

¹Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium.

Journal of Dental Research

|May 19, 2011

Summary

Nanoleakage evaluation in dental biomaterials is inconsistent. This study reveals that 3D imaging shows nanoleakage patterns are significantly affected by viewing angle and position, potentially introducing artifacts.

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Area of Science:

Biomaterials Science
Dental Research
Nanotechnology

Background:

Nanoleakage at tooth-biomaterial interfaces is implicated in degradation.
Existing reports on nanoleakage assessment are often inconsistent.
Understanding nanoleakage is crucial for improving dental restoration longevity.

Purpose of the Study:

To qualitatively and quantitatively assess nanoleakage in three dimensions (3D).
To investigate the influence of viewing direction, position, and inclination on nanoleakage patterns.
To identify potential artifacts in conventional nanoleakage evaluation methods.

Main Methods:

Application of a 3-step etch-and-rinse adhesive to dentin surfaces.
Sectioning of interface samples and infiltration with ammoniacal silver nitrate.
Generation of high-resolution 3D models using focused ion beam (FIB) and electron tomography.
Analysis of silver nitrate uptake using Monte Carlo simulations for optimized imaging conditions.

Main Results:

Focused ion beam (FIB) tomography revealed morphological characteristics similar to transmission electron microscopy (TEM).
Significant variations in silver nitrate uptake were observed in 2D projections depending on the viewing direction.
Silver nitrate fractions in 2D projections showed poor correlation with the total 3D volumetric fraction.
Electron tomography indicated that sample inclination influenced the observed nanoleakage morphology.

Conclusions:

Conventional 2D nanoleakage evaluation methods are highly susceptible to artifacts.
The direction, position, and inclination of the field-of-view significantly impact nanoleakage assessment.
Results highlight the need for advanced 3D imaging techniques for accurate nanoleakage characterization in dental biomaterials.