# Space Management in Orthodontics > Space management in BDS Orthodontics: band and loop, Nance arch, distal shoe, LLHA, TPA, removable space maintainers and space regaining protocols. - Canonical URL: https://prepelephant.com/topics/bds/orthodontics/space-management-ortho-bds - Exam / course: BDS · Subject: Orthodontics - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Space Management in Orthodontics", PrepElephant, https://prepelephant.com/topics/bds/orthodontics/space-management-ortho-bds ## Direct answer Every prematurely lost deciduous tooth leaves a management decision: hold the space, regain it, or watch it close and treat the crowding later. Space maintainers preserve arch length until the successor erupts, and they classify three ways — fixed or removable, functional or non-functional, active or passive — with named designs for specific situations: the band-and-loop for unilateral single-tooth loss, the Nance holding arch and transpalatal arch for the maxilla, the lower lingual holding arch for bilateral mandibular loss (and for banking leeway space), the distal shoe for loss of a second deciduous molar before the first permanent molar has erupted, and removable partial-denture type maintainers when multiple teeth are lost or abutments are unsuitable. Space regaining, by contrast, applies after drift has already occurred — up to about 3 mm per quadrant — using lip bumpers, molar distalisers, screw plates and headgear. The contraindications matter as much as the appliances: an imminent eruption or a successor already absent removes the reason to maintain at all. ## What you must remember - **Classification to quote:** fixed versus removable; functional (replace occlusal function) versus non-functional; active (regain space) versus passive (maintain). - **Band-and-loop:** fixed, non-functional, unilateral — the workhorse for a single lost deciduous molar with the permanent successor due; cheap, no cooperation needed, no vertical stop. - **Nance holding arch:** maxillary bilateral maintainer with an acrylic button on the palate; the transpalatal arch alternative runs a bar across the palate to stop molar rotation and mesial drift. - **Lower lingual holding arch (LLHA):** passive bilateral mandibular maintainer that also banks up to about 3.4 mm of leeway space for crowded incisors. - **Distal shoe (intra-alveolar maintainer):** the only maintainer for loss of the second deciduous molar before the first permanent molar erupts, its subgingival extension guiding the molar's eruption path; contraindicated in blood dyscrasias, immunocompromised children and poor hygiene because it is an intra-alveolar foreign body. - **Removable maintainers:** acrylic partial dentures for multiple losses, and overlay or complete prostheses after extensive early loss; they need cooperation and a retentive design. - **General contraindications:** the successor is absent (plan prosthetics instead), its eruption is imminent, the abutment teeth cannot carry bands, or hygiene is hopeless. - **Space regaining:** indicated for roughly 3 mm or less per quadrant of molar mesial drift; appliances include the lip bumper (also building arch length and lip competence), sagittal screw plates, molar distalisers and extraoral traction. ## Choosing the maintainer for three losses A five-year-old loses a single mandibular second deciduous molar to caries, with the first permanent molar still unerupted: the radiograph decides the appliance — with the molar unerupted, a distal shoe is placed so its subgingival extension holds the line and guides the molar to erupt into position rather than tipping mesially over the premolar crypt. Now picture the same child one year later, first molar erupted, and the loss is of a maxillary first deciduous molar only: a band-and-loop on the first permanent molar suffices, no palatal coverage, delivered in a single visit. Change the history to bilateral loss of deciduous molars with crowded incisors on the verge of eruption, and the choice becomes the Nance arch in the maxilla and the LLHA in the mandible — passive, symmetric, and in the mandible deliberately preserving the leeway space the molars would otherwise consume. The teaching point examiners draw from these three: the maintainer is chosen by the tooth lost, the status of the successor, the arch, and whether the space is to be preserved for a tooth or banked for alignment — in that order, each answerable from one radiograph. ## How Indian exams test space management Theory papers ask for the classification of space maintainers with ideal requirements and contraindications — the classification triple (fixed/removable, functional/non-functional, active/passive) carries the marks. Vivas probe appliance selection by scenario, and the distal shoe earns its own question: which maintainer for a second deciduous molar lost before first molar eruption, and why it is contraindicated in bleeding disorders and immunosuppression. Indian departments emphasise cement choice too — glass ionomer cement for its fluoride release and chemical adhesion to the band. The regaining question expects the 3 mm threshold and a named appliance with its mechanism; case presentations reward stating the successor's eruption status from the radiograph before naming the maintainer, since examiners listen for exactly that justification. ## Frequently asked questions ### How are space maintainers classified? As fixed or removable, functional or non-functional, and active or passive — a single appliance is described across all three axes. ### Which space maintainer suits loss of a second deciduous molar before first permanent molar eruption? The distal shoe, whose intra-alveolar extension guides the unerupted molar and prevents its mesial drift. ### What does a Nance holding arch do? A fixed bilateral maxillary maintainer whose palatal acrylic button prevents mesial drift and rotation of the banded molars after multiple deciduous molar loss. ### When is a space maintainer contraindicated? When the permanent successor is congenitally absent, its eruption is imminent, suitable abutments are unavailable, or oral hygiene and cooperation make failure likely. ### How much space can be regained and with which appliances? Roughly up to 3 mm per quadrant, using lip bumpers, sagittal screw appliances, molar distalisers or extraoral traction, provided the molar has tipped rather than bodily moved.