Crystal growth by fluoridated adhesive resins

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Crystallography

Background:

• Microleakage at the tooth-adhesive interface is a common issue in restorative dentistry.
• Fluoride-releasing adhesive resins aim to prevent secondary caries and improve longevity.
• Understanding the long-term structural changes in these adhesives is crucial for clinical success.

Purpose of the Study:

• To evaluate the in vitro long-term effects of fluoride-releasing adhesive resins on structural changes within simulated microleakage gaps.
• To investigate the potential self-reparative properties of these materials over extended periods of water storage.

Main Methods:

• Three fluoride-releasing resin adhesives (One-Up Bond F, OptiBond Solo, Reactmer Bond) were tested.
• Standardized interfacial gaps were created between resin disks and human tooth surfaces (enamel/dentin).
• Specimens were stored in distilled water for 1000 days, followed by SEM and laser-Raman spectroscopy analysis.

Main Results:

• SEM revealed crystal formation on enamel, dentin, and resin surfaces for OptiBond Solo and Reactmer Bond after 1000 days.
• No crystal formation was observed in control groups or with One-Up Bond F.
• Laser-Raman spectroscopy identified unknown crystal structures associated with OptiBond Solo.

Conclusions:

• OptiBond Solo and Reactmer Bond exhibit self-reparative potential by inducing crystal growth in interfacial gaps.
• This crystal formation may contribute to sealing microleakage and enhancing the longevity of dental restorations.
• One-Up Bond F did not show similar crystal-forming or self-reparative properties under the tested conditions.