An 8-year old child with normal tooth calcification and eruption has primary mandibular second molar extracted. The resulted space should be:
Maintained until the premolar root is 2/3 developed Closed slightly to accommodate the smaller premolar Ignored, because the second premolar will erupt in a short time Left untreated, because the difference in size between the primary molar and the premolar will compensate for any drifting that might occur