[Application of succinoxy methacrylates for direct bonding system]

Area of Science:

• Materials Science
• Biomaterials
• Dental Adhesives

Background:

• Development of direct-bonding adhesives is crucial for orthodontic bracket fixation.
• Existing adhesives require optimization for enhanced bond strength and durability.
• Novel methacrylate monomers are explored to improve adhesive properties.

Purpose of the Study:

• Synthesize novel succinoxy methacrylates for direct-bonding orthodontic adhesives.
• Evaluate the bond strength of experimental adhesives to etched enamel and stainless steel.
• Assess the influence of different etchants and monomer concentrations on adhesive performance.

Main Methods:

• Synthesis of three succinoxy methacrylates: 2-succinoxyethyl methacrylate (2SEM), 2-succinoxypropyl methacrylate (2PrM), and 2-succinoxy-3-phenoxypropyl methacrylate (SPPM).
• Formulation of experimental adhesives using MMA solution with synthesized monomers, PMMA powder, and tri-n-butyl borane initiator.
• Application of various etchants (phosphoric acid, maleic acid) and evaluation of bond strength to enamel, stainless steel, and brackets using SEM analysis.

Main Results:

• Experimental adhesives exhibited higher bond strength to polished enamel, stainless steel, and simulated brackets compared to the control.
• Maleic acid and 40% phosphoric acid etchants provided comparable bond strength to enamel, with minimal degradation after water immersion and thermal cycling.
• The direct-bonding adhesive containing 2SEM demonstrated the highest bond strength to etched enamel under all tested conditions.

Conclusions:

• Synthesized succinoxy methacrylates, particularly 2SEM, enhance the performance of direct-bonding orthodontic adhesives.
• The developed adhesives offer sufficient bond strength for orthodontic applications, with 2SEM-based formulations showing the most promise.
• Further research into optimizing monomer concentration and etchant selection can lead to improved dental adhesive systems.