Protective effects of cavity liners on dentin

Area of Science:

• Dental Materials Science
• Biomaterials
• Adhesive Dentistry

Background:

• Smear layers are a byproduct of dental procedures, significantly increasing dentin permeability.
• Increased dentin permeability can lead to pulpal irritation and sensitivity.
• Effective smear layer management is crucial for successful dental restorations.

Purpose of the Study:

• To evaluate the protective efficacy of various dental materials against subsequent acid etching.
• To determine how different agents (saline, Barrier, Copalite, LC-Scotchbond, Hydroxyline, DDS 1 & 2) shield dentin from phosphoric acid.
• To rank the materials based on their protective capabilities.

Main Methods:

• Dentin specimens with smear layers were treated with saline or one of six dental materials.
• Treated specimens were subsequently exposed to 37% phosphoric acid for two minutes.
• Protection was assessed using Scanning Electron Microscopy (SEM) and dentin permeability measurements.

Main Results:

• Saline provided minimal protection, followed by Barrier and Copalite, which offered limited efficacy.
• Hydroxyline, LC-Scotchbond, and DDS 1 & 2 demonstrated superior protection against acid attack.
• A clear ranking of protective effectiveness was established, highlighting significant differences between materials.

Conclusions:

• The effectiveness of dental materials in protecting dentin from acid etching varies considerably.
• Hydroxyline, LC-Scotchbond, and DDS 1 & 2 are recommended for their superior smear layer protection.
• Proper material selection is vital to prevent pulpal irritation caused by acid exposure.