Development and clinical evaluation of Chitra visible light cure composite

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• Bisphenol A glycidyl methacrylate (BIS-GMA) based resins are widely used in dental applications.
• Development of improved self-cured and light-cured resins is crucial for enhanced clinical performance.
• Orthodontic bracket bonding requires materials with optimal physicochemical and biological properties.

Purpose of the Study:

• To develop and characterize novel BIS-GMA based self-cured and light-cured dental resins.
• To evaluate the physicochemical properties, including setting time, strength, and hardness.
• To assess the biological safety and clinical efficacy for orthodontic bracket bonding.

Main Methods:

• Synthesis and characterization of two-paste, self-cured BIS-GMA resin.
• Development and evaluation of a light-cured BIS-GMA resin.
• Physicochemical testing: setting time, compressive strength, diametral tensile strength, microhardness, water sorption, exothermic reaction.
• Biological evaluation: cytotoxicity and biocompatibility studies on animal models.
• Clinical trials for direct bonding of orthodontic brackets comparing novel resins with commercial controls.

Main Results:

• Self-cured resin showed 83% success rate in clinical trials, comparable to control (85%).
• Light-cured resin demonstrated superior handling and easier flash removal.
• Initial light-cured resin had lower bond strength (66%) than control (79%), but improvements increased this significantly.
• Ongoing trials show reduced failure rates (11%) compared to control (13%).

Conclusions:

• BIS-GMA based self-cured and light-cured resins are safe and suitable for clinical dental applications.
• The developed light-cured resin offers improved handling characteristics for orthodontic bracket bonding.
• Further material optimization has led to enhanced bond strength and reduced failure rates in clinical trials.