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  • Arch guide with 5 arch forms
  • Selection of proper form –Arch width at the II molars
  • Maxillary arch form is selected one size larger than the   mandibular arch form
  • Drawback – Excessive narrowing in the cuspid region & excessive wear of the incisal portion of the cuspids
  • Inter cuspid width was expanded during Rx but had a strong tendency to return to its original pre Rx width in both ext & nonext cases.
  • Inter I pm width showed the greatest Rx increase in width with only a minimal post Rx reduction
  • II pm width for nonext cases showed a significant increase with slight tendency for post- retn decrease.

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