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Published on: January 6, 2023
Debonding characteristics of innovative 3D-printed lingual retainers following artificial aging and acid challenge
Noor Salam Alnuaimy1, Akram Faisal Alhuwaizi2, Akram Mohammed Altamimi3
1Al-Kunooze University, College of Dentistry, Department of Orthodontics (Albasrah, Iraq).
Introduction:
Traditional fixed retainers used after orthodontic therapy have many downsides.
Objective:
Innovative 3D-printed fixed retainers have been manufactured using nanoceramic hybrid resin-based material (SprintRay OnX®), investigating their durability to support long-term oral functions.
Methods:
One hundred acrylic blocks with mounted premolar pairs were allocated into five groups, including three groups of 3D-printed retainers with 1-mm round cross-section, one group with 1.5-mm oval cross-section, and one group with 1.5-mm semi-elliptical cross-section, and conventional multistranded stainless steel G&H® retainers and Respond® retainers. The models with bonded retainers were exposed to artificial aging or acid challenge. The debonding forces and the subsequent failure patterns were investigated.
Results:
The 3D-printed semi-elliptical retainers exhibited the greatest debonding forces, while the 3D-printed oval, G&H®, 3D-printed round, and Respond® retainers decreased in descending order. After the acid challenge, no statistically significant differences were observed between the 3D-printed semi-elliptical and oval retainers. The 3D-printed retainers showed a prevailing cohesive fracture.
Conclusion:
The debonding forces of 3D-printed semi-elliptical and oval retainers following simulated aging and acid exposure were encouraging. They might be a good candidate as lingual retainers.
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