What is the recommended action when a first deciduous molar is lost in a 10-year-old child?

The recommended action when a first deciduous molar is lost in a 10-year-old child is to evaluate the case radiographically and then decide whether a space maintainer is needed. This approach is crucial because the first deciduous molars play an important role in maintaining the proper alignment of the teeth as well as guiding the eruption of the permanent molars. If the space is not maintained, adjacent teeth may drift into the gap, potentially leading to crowding or misalignment in the future.

Radiographic evaluation allows the dental professional to assess the developing permanent teeth and determine whether they are adequately positioned to take over the space left by the lost molar. If there is potential for complications resulting from the loss of the primary tooth, such as an increased risk of spacing issues or misalignment, the need for a space maintainer can be established.

The other options are less effective in ensuring proper dental development and alignment. Using a band and loop as a routine response might not be necessary if the radiographic assessment shows that the permanent tooth will erupt appropriately within a reasonable time frame. Conversely, choosing no treatment at all does not consider the potential consequences of losing the tooth, which may lead to more significant orthodontic issues later on.