This fact is from Space Maintainers in Pedodontics. It is a commonly tested concept in NEET MDS examinations. Understanding this fact is crucial for answering MCQs correctly.
Band and loop = unilateral posterior premature loss
Lingual arch = bilateral mandibular space maintenance
Nance button = bilateral maxillary space maintenance
Distal shoe = second primary molar lost before first permanent molar erupts
Transpalatal arch = maxillary anchorage
Leeway space = E space difference primary second molar and premolar