An in vitro comparative analysis: scanning electron microscopy of dentin/restoration interfaces

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Microscopy Techniques

Background:

• Accurate evaluation of tooth-restoration interfaces is crucial for assessing restorative material performance.
• Replication techniques are often used to study these interfaces, but their accuracy can vary depending on the material.

Purpose of the Study:

• To compare the accuracy of replicas versus actual tooth sections when evaluating different restorative material interfaces.
• To determine if replication methods introduce significant differences in the observed tooth/restoration interface, particularly for glass ionomer and resin-based bonding systems.

Main Methods:

• Maxillary premolar teeth were restored using ten different techniques.
• Sections were prepared and either directly examined or replicated using vinyl polysiloxane and epoxy resin.
• Both sections and replicas were analyzed using scanning electron microscopy (SEM).

Main Results:

• SEM analysis revealed a marked difference between replicas and tooth sections for glass ionomer-based restorations.
• No significant difference was observed between replicas and tooth sections for resin-based bonding systems.
• Different tooth/restoration interfaces were observed, influenced by the restorative materials used.

Conclusions:

• Replication techniques using vinyl polysiloxane and epoxy resin may not accurately represent the true tooth/restoration interface for glass ionomer materials.
• Resin-based bonding systems appear to be more reliably evaluated using replication methods compared to glass ionomers.
• The choice of replication material and technique is critical when assessing restorative interfaces with SEM.