Hardness of denture reline materials polymerized with different techniques

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Materials Science

Background:

• Denture reline materials are crucial for maintaining denture fit and function.
• Self-cured materials offer convenience but their properties can be influenced by polymerization methods.
• Optimizing the mechanical properties of denture reline materials is essential for patient comfort and durability.

Purpose of the Study:

• To evaluate the effect of different polymerization techniques on the hardness of hard type self-cured denture reline materials.
• To compare the hardness development of materials cured on a glass plate, under water, and under water with a hardening agent.
• To determine the time course of hardness changes in these dental materials.

Main Methods:

• Two types of hard denture reline materials were used.
• Polymerization was performed using three distinct methods: glass plate, water immersion, and water immersion with a hardening agent.
• Specimen hardness was measured over a three-week period while stored in 37°C water.

Main Results:

• Specimens cured with the hardening agent exhibited superior hardness compared to those cured solely in water.
• A significant increase in hardness was observed for all tested materials.
• The majority of hardness changes occurred within the initial three days of the experimental period.

Conclusions:

• Incorporating a hardening agent during polymerization enhances the final hardness of self-cured denture reline materials.
• The polymerization method significantly impacts the mechanical properties of these dental materials.
• Understanding the kinetics of hardness development is crucial for clinical application and material selection.