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30 Cards in this Set
- Front
- Back
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Ideal prerequisites of space maintainer?
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1. Simple to construct and maintain
2. Durable, strong, stable 3. Passive 4. Easily cleanable and not enhance dental caries or soft tissue pathology 5. Adjustable for flexible application |
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When should a space maintainer be placed?
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When space for permanent tooth is being invaded (encroached)
Take consideration of dental health, motivation and occlusion status |
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What factors to consider when placing a space maintainer?
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1. Dental and periodontal condition
2. Arch length 3. Presence/absence of permanent successor 4. Time elapsed since loss of primary tooth 5. Status of first permanent molar eruption 6. Status of permanent successor’s development and eruption potential 7. Cooperation level of child and parents 8. Which tooth is lost, in which arch, at what time? |
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When is space maintainer not required?
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1. Existence of cuspal interference.
2. Widely spaced primary dentition. 3. If succeeding tooth is expected to erupt within 6 months. 4. If present space is not adequate for the succeeding tooth. 5. The possibility of future orthodontic work. 6. Where the opposing 6's are locked into a desirable and stable relationship |
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Succeeding tooth is most likely to erupt in 6 months if?
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1. 75% of the root is present on the succeeding tooth.
2. Less than 1 mm of alveolar bone is covering succeeding tooth. 3. Destruction of the alveolar bone occurred when the primary tooth was lost. 4. Mixed-dentition is in its later stages |
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Parental consent: what are the information to be aware by the parents when placing space maintainer?
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1. SM requires monitoring.
2. Patient must maintain adequate OH. 3. Appliance may break, requiring repair or replacement. 4. Broken appliances are hazardous to the child and will be ineffective. 5. Even properly maintained appliances may fail to preserve the space. |
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What are basic space maintainers?
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DISTAL SHOE
NANCE appliance LOWER LINGUAL ARCH (LLA) BAND/CROWN and LOOP |
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When to use which space maintainer?
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Distal Shoe: 2nd Primary Molar Extraction with unerupted 1st Permanent Molar
Nance or Band/Crown Loop: Maxillary problem with 1st Permanent Molars present Lower Lingual Holding Arch: Mandibular Problem with 1st Primary Molars ( or 2nd primary molar) and Permanent Incisors present Band/Crown and Loop: Primary 1st and 2nd Molar Extraction |
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Disad of removable SM appliances?
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High failure rate due to:
can be lost break easily require exceptional compliance |
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What is this called?
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Distal shoe
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What is this SM called?
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Band and loop
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Label
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a. wire
b. band c. crib d. loop |
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What is this?
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Crown and loop
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Name this
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Trans Palatal Arch
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name this
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Nance appliance
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Name this
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Lower Lingual Arch
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Distal shoes can be used in which arch? At what circumstance?
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MAXILLARY or MANDIBULAR
when second primary molar requires extraction and first permanent molar has not erupted |
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What must be evaluated with
radiograph prior to cementation of Distal Shoe? |
Length
Position |
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What happens when permanent teeth erupt while Distal Shoe is sitting?
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Will be replaced with another space maintainer when permanent teeth erupt.
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When to use band and loop?
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Loss of any primary posterior teeth
but not when two primary molars in series are missing |
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Disadvantages of band and loop?
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Masticatory function not restored
Extrusion of opposing tooth not prevented Prevention of normal distal movement of primary cuspids |
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Advantages of Crown and loop over Band&Loop?
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Stronger
Lower cementation failure Can be used when tooth require restoration |
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Nance Appliance is used on which arch?
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Maxillary only
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Nance Appliance band is tied to which tooth?
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first permanent molars
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Advantage of TPA over Nance App?
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No acrylic button so easier to clean and less tissue irritation
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The best indication for TPA?
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When one side of the arch is intact and the other side is missing several teeth
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In LLA, anterior stop is placed at where?
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Cingulum of permanent anteriors
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Advantages of LLA?
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Maintains arch form
Allows eruption of perm teeth w/o interference (duh!) Ease of cleaning Can be modified easily Patient comfort |
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Disadvantages of LLA?
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Does not prevent extrusion of opposing tooth
Not advisable to band teeth that are: hypoplastic hypocalcified highly prone to caries Can promote decay in noncompliant patients. DISTORTION, BREAKAGE |
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LLA should not be placed with primary incisors.
T/F? |
True
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