The mechanical testing and performance analysis of three-dimensionally produced lingual retainers

Area of Science:

• Orthodontics
• Biomaterials Engineering
• Dental Technology

Background:

• Three-dimensional (3D) printing is revolutionizing orthodontics.
• This study investigates the properties of 3D-printed orthodontic retainers.
• Evaluation of 3D-printed retainers includes bond strength, failure analysis, discoloration, and biodegradation.

Purpose of the Study:

• To evaluate the in vitro performance of 3D-printed orthodontic retainers.
• To compare 3D-printed retainers with conventional methods.
• To assess the potential clinical applicability of novel 3D printing techniques in orthodontics.

Main Methods:

• 30 human lower incisor teeth specimens were divided into three groups (n=10 each) for bond strength testing.
• Experimental groups used lingual retainers fabricated with a 3D dental pen (Group 1) and 3D printing (Group 2).
• Control group (Group 3) used a conventional wire and composite retainer. Discoloration and biodegradation tests were conducted on separate specimens exposed to water, tea, and coffee.

Main Results:

• Significant differences were observed across all tested parameters among the groups.
• The 3D dental pen group exhibited the highest bond strength.
• Discoloration varied significantly between the groups, indicating material sensitivity to environmental factors.

Conclusions:

• 3D-printed retainers demonstrate potential for future clinical use in orthodontics.
• Further research is warranted to address limitations and optimize 3D printing applications.
• The study highlights the evolving role of additive manufacturing in dental restorative and corrective treatments.