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NEET MDS Quiz - Practice Test
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Practice Test

Conservative Dentistry - 3 Questions

1
Conservative Dentistry
Retention grooves are placed in a class V cavity for non-adhesive restoration in 
 1. Mesioaxial and distoaxial line angles
 2. Occlusoaxial and gingivoaxial line angles
 3. All line angles of the cavity
 4. None of the above

πŸ“ Explanation:

Retention grooves in a class V cavity for non-adhesive restoration are placed in the mesioaxial and distoaxial line angles. These grooves help hold the restoration in place by providing mechanical retention and reducing the risk of microleakage.

2
Conservative Dentistry
Which is not a property of resin ionomer restorative material
1) It is a dual core polymerization system
2) It is radiolucent
3) It releases fluoride
4) It adheres to the dentin

πŸ“ Explanation:

Resin ionomer restorative materials (also known as resin-modified glass ionomer cements) are designed to be radiopaque, meaning they show up on X-rays, which allows dentists to distinguish them from tooth decay or normal tooth structure. 
They typically use a dual-cure (dual core polymerization) system involving both an acid-base reaction (like conventional glass ionomers) and a light-cured resin polymerization.
 
A key characteristic of these materials is their ability to release fluoride over time, which helps prevent secondary tooth decay. 

3
Conservative Dentistry
Failure of casting to seat on the cast is overcome by
1) Scraping the cast to seat
2) Forcefully positioning the casting
3) Wash the casting with HCI
4) Discard if the discrepancy is more than 0.3 mm

πŸ“ Explanation:

Failure of a cast to seat properly on the cast during the restoration process can be due to various factors such as distortion during fabrication or changes in the cast material. To overcome this, the cast can be scraped with a sharp instrument to remove any excess material that may be preventing proper seating. Washing the casting with HCI (hydrochloric acid) may help to clean and smooth the surface, but it is not a common practice for this specific purpose. Forcefully positioning the casting can cause damage to the cast and is not recommended. If the discrepancy is more than 0.3 mm, it is generally advised to discard the cast and make a new one to ensure a precise and accurate fit.

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