Nano- and microscale evaluation of human enamel after different debonding methods

Area of Science:

• Dental Materials Science
• Orthodontic Technology
• Biomaterials Engineering

Background:

• Orthodontic bracket debonding is crucial for enamel preservation.
• Current debonding methods lack comparative analysis regarding enamel surface integrity.
• Determining the most appropriate debonding technique is essential for clinical practice.

Purpose of the Study:

• To compare the effects of six common orthodontic bracket debonding methods.
• To evaluate impacts on enamel surface roughness, volume loss, and color change.
• To assess the time required for each debonding method.

Main Methods:

• Six debonding techniques were tested on 60 extracted teeth: low-speed (LS-TCB) and high-speed tungsten carbide burs (HS-TCB), Sof-Lex discs, fiberglass bur, Enhance disc, and adhesive removal pliers with pumice (ARP-P).
• Enamel roughness was measured using atomic force microscopy and scanning electron microscopy.
• Enamel volume loss, color change, and debonding time were quantified using micro-computed tomography, spectrophotometry, and direct recording, respectively.

Main Results:

• High-speed tungsten carbide burs (HS-TCB) and adhesive removal pliers with pumice (ARP-P) significantly increased enamel roughness.
• HS-TCB resulted in the greatest enamel volume loss, while fiberglass burs caused the least.
• All methods caused detectable color changes, with Sof-Lex discs showing the most significant alteration; HS-TCB was the fastest method, and ARP-P was the slowest.

Conclusions:

• Debonding methods exhibit varying degrees of enamel damage.
• Faster methods, such as HS-TCB, are associated with increased enamel alteration.
• Slower, gentler methods prioritize enamel preservation, which should be clinicians' primary concern.