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The photograph demonstrates another variation on the bilateral use of fixed unilateral space maintainers. In this case, a fixed unilateral band and loop space maintainer was used on one side and a fixed unilateral crown and loop space maintainer was used on the other side. Crown and loop space maintainers can be used when a stainless steel crown is needed on a tooth which also is an abutment for a space maintainer.
However, often band and loop space maintainers are used over stainless steel crowns. The rationale for using a band and loop space maintainer over a stainless steel crown is that if the band and loop appliance is no longer needed or if it fails, replacing the stainless steel crown will not also be necessary.
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