Long-term effects of different cleaning methods on copolyester retainer properties

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Copolyester retainers are widely used in orthodontics.
• Maintaining the physical properties of retainers during long-term use is crucial for efficacy.
• The impact of various cleaning methods on copolyester retainer properties requires thorough investigation.

Purpose of the Study:

• To evaluate the long-term effects of different cleaning methods on the light transmittance, surface roughness, and flexural modulus of copolyester retainer material.
• To compare the efficacy of seven chemical cleaning solutions and mechanical brushing on retainer material properties.

Main Methods:

• Standardized copolyester retainer specimens were exposed to seven chemical cleaning solutions and mechanical brushing for six months.
• Light transmittance, surface roughness, and flexural modulus were measured at baseline and after six months.
• Scanning electron microscopy (SEM) was used for qualitative assessment of surface changes.

Main Results:

• All tested cleaning methods significantly decreased light transmittance over six months.
• Flexural modulus significantly decreased with most cleaning methods, except for Invisalign cleaning crystals and Retainer Brite.
• Hydrogen peroxide (H2O2) showed the greatest change in flexural modulus, while Listerine caused the most significant light transmittance reduction.

Conclusions:

• Different cleaning methods adversely affect the long-term physical properties of copolyester retainer material.
• Current cleaning solutions may compromise the optical and mechanical integrity of copolyester retainers.
• Further research is needed to identify ideal cleaning protocols for maintaining copolyester retainer performance.