Assessment of Bracket Surface Morphology and Dimensional Change

Area of Science:

• Orthodontic materials science
• Biomaterials engineering
• Dental research

Background:

• Orthodontic brackets are crucial for tooth movement.
• Assessing bracket dimensional stability and enamel interaction is vital for treatment outcomes.
• Different bracket types (self-ligating, ceramic with metal slot, stainless steel) may exhibit varying intraoral behavior.

Purpose of the Study:

• To compare the surface morphology and dimensional stability of three orthodontic bracket types after 12 months of intraoral exposure.
• To evaluate enamel loss associated with each bracket type using calcium quantification.

Main Methods:

• Sixty 0.022" MBT canine brackets were divided into three groups: self-ligating, ceramic with metal slot, and stainless steel (SS).
• Slot dimensions and micromorphology were analyzed using stereomicroscopy and scanning electron microscopy (SEM).
• Enamel loss was quantified by measuring calcium at the bracket base via energy-dispersive X-ray spectrometry (EDX).

Main Results:

• Ceramic brackets exhibited minimal dimensional changes in slot dimensions compared to SS and self-ligating brackets.
• SEM revealed increased surface roughness in ceramic with metal slot brackets; self-ligating brackets showed the least surface irregularity.
• EDX detected calcium on all brackets, with ceramic with metal slot brackets showing significantly higher levels, indicating greater enamel loss.

Conclusions:

• Ceramic brackets demonstrate superior dimensional stability during orthodontic treatment.
• Self-ligating brackets offer advantages in maintaining surface integrity.
• Ceramic brackets with metal slots pose a higher risk of enamel loss, necessitating careful consideration.