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Published on: December 20, 2024
Comparison of mechanical properties and color stability of various vacuum-formed orthodontic retainers: An in vitro
Aljazi H Aldweesh1, Nassr S Al-Maflehi2, Muhannad AlGhizzi3
1Division of Orthodontics, Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Abstract:
Vacuum-formed retainer (VFR) is the most used retainer due to its higher aesthetic properties and lower cost, their mechanical properties of are important in determining the stability and long-term use of appliances made out of them.
Aim:
This study aimed to evaluate and compare the flexural modulus, surface hardness, and color stability of three different VFR materials.
Methods:
Three different VFR materials, namely Duran, Keystone, and Zendura, of 1 mm thickness, were tested after thermoforming for flexural modulus, hardness, and color stability. They were formed over a stainless-steel model of 12 mm diameter and 6 mm height.
Results:
There were significant statistical differences (p = 0.000) in the flexural modulus and hardness of the three materials. Regarding color stability, Zendura exhibited significantly higher ΔE* values than Keystone and Duran (p < 0.05).
Conclusions:
Zendura had the highest flexural modulus and hardness compared with Duran and Keystone; however, it is more susceptible to color change compared to the other tested materials.
