Cure kinetics of composites using video imaging.

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Dental composites are widely used restorative materials.
• Understanding their curing kinetics is crucial for clinical success.
• Factors like light intensity and irradiation time influence polymerization.

Purpose of the Study:

• To investigate the curing rates of three dental composites: Heliomolar, Z100, and Renew.
• To determine the effect of varying light intensity and irradiation time on the curing rate of Renew composite.
• To compare the gel times and kinetic constants of the investigated composites.

Main Methods:

• Volumetric shrinkage was measured using the Acuvol at 25°C with an RG610 red filter.
• Dynamic measurements were performed in single view mode.
• Kinetic studies involved varying light intensity (100mW - 500mW) and irradiation time (3s - 30s).
• Statistical analysis included ANOVA, Fisher's LSD test, and Kruskall-Wallis test.

Main Results:

• Gel times followed the order: Heliomolar > Renew > Z100 under specific conditions (20 seconds and 500 mW).
• Irradiation time did not significantly affect the gel time of Renew composite.
• Light intensity significantly influenced the gel time of Renew composite.
• Detailed kinetic studies provided insights into the curing process of Renew.

Conclusions:

• Light intensity is a critical factor affecting the curing kinetics of Renew composite.
• The curing characteristics and gel times differ significantly among the tested dental composites.
• Further research into optimizing curing parameters for dental composites is warranted.