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As you see demonstrated in red, a space maintainer is indicated to prevent mesial movement of the second primary molar. A band and loop space maintainer is the best choice. It is especially important to start space maintenance therapy prior to the eruption phase of the first permanent molar, since the force of eruption of the permanent molar will exert a lot of pressure to push the second primary molar forward. The eruption phase of the permanent molar is the time of greatest force exerted against the primary molar.
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