Preendodontic Dentin Hybridization - Effect on Coronal Dentin Microhardness and Resin-Dentin Bond Strength: An In...

Area of Science:

• Dental Materials Science
• Endodontics
• Biomaterials

Background:

• Endodontic chemical substances (ECS) can compromise coronal dentin integrity.
• This structural impact can negatively affect the success of endodontic therapy.
• Pre-endodontic dentin hybridization (PEDH) is proposed as a protective strategy.

Purpose of the Study:

• To evaluate the impact of ECS on dentin microhardness and resin-dentin microshear bond strength (µSBS).
• To assess the protective efficacy of PEDH against ECS-induced degradation.
• To compare different hybridization timings and ultrasonic repreparation effects.

Main Methods:

• Eighty dentin specimens were divided into Control, Late Dentin Hybridization (LDH), PEDH, and Ultrasonic LDH (ULDH) groups.
• Specimens were exposed to ECS, followed by or preceded by dentin hybridization.
• Microhardness and µSBS were measured using Vickers micro indenter and universal testing machine, respectively.

Main Results:

• LDH significantly reduced bond strength compared to all other groups.
• The PEDH group demonstrated microhardness and µSBS values comparable to the control group.
• ULDH improved bond strength over LDH but significantly decreased microhardness.

Conclusions:

• ECS exposure detrimentally affects coronal dentin microhardness and µSBS.
• PEDH effectively preserves dentin properties, yielding results similar to untreated controls.
• PEDH offers a protective benefit without requiring additional ultrasonic procedures.