Principles of Cavity Design in Deciduous Teeth Flashcards
(17 cards)
List some reasons on why you should restore deciduous teeth (8)
- Eradicate disease and restore health
- Simplest form of treatment (easier than extraction)
- Prevent pain/suffering
- Avoid infection
- Maintain arch length
- Restore function
- Psychological benefits
- Quality of life
Comment on the difference in enamel between permanent and primary molars
Primary enamel is thinner
Where is the thickest dentin in a primary molar found?
Greater thickness of dentin is over the pulpal wall at the occlusal surface compared to anywhere else in the tooth
Comment on the difference in pulp chamber sizes between permanent and primary molars
Primary pulp chamber is bigger
Comment on the difference in pulpal horn sizes between permanent and primary molars
Higher pulpal horns in primary
Comment on the difference in cervical ridges between permanent and primary molars
The cervical ridges are more pronounced on primary especially at buccal aspect of primary 1st molars
Comment on the difference in enamel rod orientation between permanent and primary molars
The enamel rods at the cervix in primary teeth slope occlusally instead of gingivally
Comment on the difference in roots compared to crown size between permanent and primary molars
The roots of the primary teeth are longer and more slender in comparison with crown size
What factors may you need to consider before restoring a deciduous tooth? (5)
- Developmental stage of child
- Caries risk assessment
- Oral hygiene
- Parent compliance
- Child compliance
Name some restorative materials used for deciduous teeth (5)
- Composite
- GIC
- RMGIC
- Compomers (Polyacid modified composite resin)
- Stainless steel crown
What considerations need to take place when preparing a deciduous cavity? (4)
- Risk of pulpal exposure as pulpal horns are higher
- Buccal and lingual wall should be parallel to the outer tooth surface
- Isthmus width should be 1/3 the intercuspal distance
- No bevel at the gingival seat
What is isthmus?
Central portion of the cavity preparation on the occlusal surface of a bicuspid or molar
In a class I preparation where is the isthmus located?
Between the mesial and distal dovetails
In a class II preparation where is the isthmus located?
Between two proximal flares or one proximal flare and dovetail
What instrument do we use to prepare deciduous cavities?
330 Tungsten Carbide Bur
Pear shaped
On a 2 surface restoration where is caries most likely to begin?
Contact area (where two teeth meet)
When carrying out a 2 surface deciduous restoration what should be the depth of;
The occlusal aspect?
The proximal box?
What may happen if you exceed these depths?
- 1.5mm depth
- 2.5mm depth
- Drill into pulp
