Renewal MI Dental Composite Etch and Seal Properties

Area of Science:

• Dental Materials Science
• Biomaterials Engineering

Background:

• Minimally invasive dentistry (MID) requires materials with excellent adhesion and sealing capabilities.
• Current dental composites face challenges in effectively managing demineralized dentine and achieving durable seals.

Purpose of the Study:

• To evaluate the self-etching potential of Renewal MI composite on enamel.
• To assess Renewal MI's ability to seal sound cavities.
• To determine Renewal MI's efficacy in stabilizing demineralized dentine.

Main Methods:

• Scanning electron microscopy (SEM) for etching assessment.
• ISO-11405 dye microleakage test for cavity sealing.
• Evaluation of resin tag formation, enzyme activity, and mineral precipitation for demineralized dentine stabilization.

Main Results:

• Renewal MI demonstrated mild enamel etching, comparable to 37% phosphoric acid.
• It achieved a comparable cavity seal to Z250/Scotchbond Universal and superior to Activa, Fuji IX, and Fuji II LC.
• Renewal MI formed significant resin tags (300-400 µm) on demineralized dentine, correlating with reduced enzyme activity and promoting mineral precipitation.

Conclusions:

• Renewal MI exhibits novel self-etching and sealing properties.
• Its ability to stabilize demineralized dentine through resin tag formation and mineral precipitation is significant.
• These characteristics suggest Renewal MI is a promising material for minimally invasive dental applications.