76409

The goal of bone removal during the extraction of an impacted molar is to expose enough of the tooth to allow for proper grasping with forceps and to reduce the risk of fracturing the tooth or surrounding structures. It is typically not necessary to remove bone up to the furcation or half the roots unless there are specific pathological reasons to do so.

33747

Focal periapical osteopetrosis is NOT a radiolucent lesion - it appears as a well-defined radiopaque (sclerotic) area around the apex of teeth. It represents a localized increase in bone density. Ameloblastoma appears as multilocular radiolucency with soap-bubble appearance, cherubism shows bilateral multilocular radiolucencies, and odontogenic cysts appear as well-defined radiolucent lesions with radiopaque borders.

43649

1. Infectious hepatitis (Hepatitis A virus): While HAV is resistant to some environmental conditions, it is generally less resistant than HBV.

2. Mumps virus: This is an enveloped virus and is not particularly resistant to environmental factors.

3. Influenza virus: This is also an enveloped virus and is susceptible to heat and many disinfectants.

4. Serum hepatitis (Hepatitis B virus): HBV is known for its resilience. It can survive outside the body for long periods and is resistant to many disinfectants and physical agents, making it one of the more resistant viruses.

95503

Chronic constitutional symptoms (fever, weight loss) and a strongly positive Mantoux test (>15mm) are highly suggestive of TB even if initial sputum smears are negative.

48388

Ethohepatazine is a chemical derivative of meperidine

74028

Solution

28908

File scalers are designed with multiple blades and are used to fracture or crush large deposits of calculus effectively.

39129

Pressure on a tooth root, such as during orthodontic treatment, stimulates osteoclast activity on the compression side of the tooth. This process is a basic principle of root resorption, where bone is removed to allow for tooth movement.

86421

Integrins are likely under-expressed in this boy, as they play a crucial role in cell adhesion and signaling, and their deficiency can lead to various immunological issues.

63241

 Etching of tooth surface with 37% phosphoric acid creates microporosities in the enamel and dentin. This is the main method of adhesion of composite resin to tooth surface.
 After etching the surface energy of the enamel will increase. This will make it very sticky to any kind of contaminants. If salivary contamination will occur, the salivary proteins will precipitate in the microporosities. This will prevent the adequate penetration of the bonding agent, therby reducing the micotag formation. Hence, complete isolation is essential.