What does adding a metal slot to plastic brackets accomplish?

What does adding a metal slot to plastic brackets accomplish?

• A. Resolves poor dimensional stability and high friction
• B. Increases staining
• C. Decreases enamel roughness
• D. Increases archwire rigidity

Answer: (A)

Adding a metal slot to plastic brackets improves two critical aspects of wire–bracket interaction: slot stability and friction. Plastic brackets tend to creep, absorb moisture, and deform under load, which enlarges the slot and alters how the wire fits—reducing precision and torquing control. A metal slot, being rigid, maintains a consistent, accurate slot size, so the archwire sits more predictably. This rigidity also minimizes wear and deformation at the interface, lowering friction and binding as the wire slides through the bracket during movement. Staining or enamel roughness aren’t direct benefits of this change, and the slot’s material doesn’t inherently make the archwire more rigid—the wire’s own properties do that.