Mechanical Properties of 3D Printed Orthodontic Retainers

Area of Science:

• Biomaterials Science
• Dental Materials
• Orthodontics

Background:

• Orthodontic retention is crucial for maintaining tooth position post-treatment.
• Fixed wire retainers are common for adults, but alternatives are sought.
• 3D printing offers a novel approach to fabricating orthodontic retainers.

Purpose of the Study:

• To analyze the mechanical properties of novel 3D printed fixed orthodontic retainers.
• To compare the influence of retainer thickness on mechanical performance.
• To evaluate 3D printed retainers as an alternative to metal options.

Main Methods:

• Samples of 3D printed resin (Nextdent MFH C&B N1) were fabricated in cuboid shapes.
• Retainer thickness varied (0.8 mm, 1 mm, 1.2 mm) to assess its impact.
• Mechanical tests included flexural strength, elastic properties, deflection, and creep, with aging in artificial saliva.

Main Results:

• Retainer thickness significantly influenced elastic and strength properties.
• The 1.2 mm thick samples demonstrated the highest flexural modulus, deflection, creep, and strength.
• Samples with 1 mm thickness exhibited the lowest modulus of elasticity.

Conclusions:

• 3D printed retainers possess mechanical properties suitable for orthodontic retention.
• Thickness is a key factor influencing the performance of these novel retainers.
• These 3D printed devices present a potential alternative for patients with aesthetic concerns or metal allergies.