CAD/CAM nitinol bonded retainer versus a chairside rectangular-chain bonded retainer: A multicentre randomised...

Area of Science:

• Orthodontics
• Dental Materials Science
• Clinical Trials

Background:

• Bonded retainers are crucial for maintaining anterior tooth positions post-orthodontic treatment.
• Evidence comparing the efficacy of different bonded retainer types is limited.
• This study addresses the need for comparative data on retainer stability and patient outcomes.

Purpose of the Study:

• To compare the stability, failure rates, and patient satisfaction of CAD/CAM nitinol bonded retainers (Memotain®) versus chairside rectangular-chain bonded retainers (Ortho-FlexTech™).
• To evaluate the performance of these retainers in both upper and lower arches.

Main Methods:

• A multi-center, randomized controlled trial with 68 patients allocated to Memotain® or Ortho-FlexTech™ retainers.
• Measurements included study models at debond and six months post-treatment.
• Patient satisfaction was assessed via questionnaires at six months.

Main Results:

• The trial was terminated early due to a 50% failure rate in upper Memotain® retainers within six months.
• Memotain® retainers showed a significantly higher risk of failure in the upper arch compared to Ortho-FlexTech™ retainers (HR=2.82).
• Patient satisfaction levels were comparable between the two retainer groups.

Conclusions:

• Upper Memotain® bonded retainers exhibit a higher failure rate compared to upper Ortho-FlexTech™ retainers.
• The trial's early termination due to high failure rates necessitates cautious interpretation of findings.
• Further research may be needed to optimize nitinol retainer design or explore alternative materials.