MDS PREP
The polishing agent which can be used to polish amalgam restoration is
1) Garnet
2) Emery
3) Silex
4) Alumina
Conservative Dentistry
Answer: 2
Emery is a polishing agent that can be used to polish amalgam restorations. It is a natural abrasive material that is relatively safe for metal surfaces and does not cause significant wear on the amalgam. Garnet, silex, and alumina are also abrasive materials, but they are less commonly used for polishing amalgam due to potential issues with scratching or wearing down the restoration.
Axial wall in class V cavity in transverse section appears
1. Convex mediodistally and uniformaly placed in the dentin
2. Straight with flat wall
3. Kidney shaped with converging mesial and distal
4. Concave shaped
Conservative Dentistry
Answer: 1
The axial wall in class V cavity in transverse section appears convex
mediodistally and uniformly placed in the dentin. This is because the cavity is
typically shallower in the center and deeper towards the line angles, providing
a good seal and preventing food and plaque accumulation.
Primary determinant of the outline form in class V preparation
1. Height of the gingival crest
2. Extension of the caries
3. Type of the restorative material
4. Teeth anatomy
Conservative Dentistry
Answer: 2
Explanation: The outline form of a Class V cavity preparation
is primarily determined by the extent of carious tissue. The goal is to remove
all carious dentin while preserving as much healthy tooth structure as possible.
The outline form must encompass the entire area affected by caries to ensure
that the restoration is effective and durable. Other factors, such as the height
of the gingival crest, type of restorative material, and tooth anatomy, may
influence the preparation but are secondary to the extent of caries.
Upper limit of urinary mercury attributed to extensive amalgam restoration
1) 1 microgram/g of creatinine
2) 3 microgram/g of creatinine
3) 2 microgram/g of creatinine
4) 4 microgram/g of creatinine
Conservative Dentistry
Answer: 4
The upper limit of urinary mercury attributed to extensive amalgam restoration is typically considered to be 4 micrograms/g of creatinine. While the actual limit can vary based on the individual and the extent of amalgam fillings, a level of 4 micrograms/g of creatinine is commonly used as a benchmark for evaluating potential health concerns related to mercury exposure from dental amalgam.
During cavity preparation, more incidence of exposure is in
1. Class V cavity in first premolar
2. Class II mesioocclusal cavity
3. Class II distoocclusal cavity
4. Class IV cavity
Conservative Dentistry
Answer: 1
During cavity preparation, the incidence of pulpal exposure is higher in class V
cavities on first premolars due to the proximity of the margins to the pulp
horns.
When dental bur is sterlized by autoclaving, which of the following chemicals is used for protection of the bur
1) Sodium nitrate
2) Sodium nitrite
3) Silver nitrate
4) Silver nitrite
Conservative Dentistry
Answer: 2
Explanation:Sodium nitrite is often used as a protective agent during the autoclaving process to prevent corrosion of dental instruments, including burs. It helps to maintain the integrity of the metal during the sterilization process.
The advantage of natural glaze compared to applied artificial glaze
1) More smooth finish is achieved
2) More permanent glaze is achieved
3) More shiny surface is achieved
4) All of the above
Conservative Dentistry
Answer: 2
Natural glaze is often more durable and permanent compared to applied artificial
glaze, providing a better finish.
Good supplement to radiographs in diagnosing class III caries clinically is
1) Caries activity tests
2) Examine colour changes below marginal ridges
3) Mirror and explorer
4) Vitality tests
Conservative Dentistry
Answer: 2
To diagnose class III caries clinically, which is caries that involves the proximal surfaces of teeth, a good supplement to radiographs is to examine the proximal surfaces for any color changes, particularly at the contact points where two teeth touch. This is often done using a combination of visual inspection and the use of a dental explorer to detect cavities and softened enamel. However, the answer provided, "Caries activity tests," refers to methods used to assess the activity or inactivity of a caries lesion, not necessarily for diagnosis.