Serving your Orthodontic needs since 1990.

EX230 W Arch Expander

Appliance Purpose / Function:
The W Arch,or Porter expander is used to expand the posterior segments of the arch, correct bilataral or unilataral cross bites, and help align crowded teeth.

Appliance Components:

  • Bands on the 1st permanent molars
  • W Arch wire

Suggested Materials:

  • .036 Chromium Cobalt wire
  • Silver Solder (Cadmium Free)


  • Laser welding (no solder)
  • Face mask hooks
  • Archwire Tubes
  • Headgear Tubes

Appliance Fabrication Standards:

  • .036 Blue Elgiloy wire
  • Wire should rest 1 – 1.5mm off the soft tissue
  • Approximately 4mm of wire should lay on the band for soldering or welding
  • Lingual bars should extend to the mesial of the cuspids

All information is from