Enzyme marker of acute alcohol toxicity

 # A person with a long history of alcohol intake reports with acute alcohol intoxication. Which of the following enzymes is a marker of acute toxicity?

A. AST

B. ALT

C. GGT

D. Alkaline phosphatase

The correct answer is:

C. GGT (Gamma-Glutamyl Transferase)

Explanation:
Gamma-glutamyl transferase (GGT) is a sensitive marker for alcohol consumption and acute alcohol toxicity. It is elevated in conditions involving liver damage, particularly from chronic alcohol use. While AST and ALT may also be elevated in liver damage, GGT is more specific for alcohol-related effects. Alkaline phosphatase is primarily associated with biliary obstruction or bone disorders.

Calcium hydroxide applied directly to the exposed pulp to preserve its vitality

 # A patient with pulp exposure has calcium hydroxide applied directly to the exposed pulp to preserve its vitality. What is this procedure called?

A. Indirect pulp capping

B. Partial pulpotomy

C. Direct pulp capping

D. Cvek pulpotomy

The correct answer is:

C. Direct pulp capping

Direct pulp capping involves the application of a biocompatible material, such as calcium hydroxide, directly onto an exposed pulp to preserve its vitality and encourage the formation of reparative dentin.

Soreness of the muscles after wearing the denture for sometime

 # A newly fabricated complete denture patient reports with the complaint of soreness of the muscles after wearing the denture for sometime. What could be the probable cause?

A. Increased interocclusal space

B. Decreased interocclusal space

C. Excessive muscular force on the denture

D. Repeated muscle trauma

The correct answer is: B. Decreased interocclusal space

Explanation:

Soreness of the muscles after wearing newly fabricated complete dentures is often due to a decreased interocclusal space (or excessive occlusal vertical dimension). When the interocclusal space is inadequate:

1. The denture teeth are set too far apart, increasing the vertical dimension of occlusion (VDO).
2. This forces the muscles of mastication to remain overly contracted, leading to muscle fatigue and soreness over time.
3. The patient may also experience difficulty closing their mouth comfortably or feel that the dentures are "too tall."

Other options:

• A. Increased interocclusal space: Excessive interocclusal space (reduced VDO) might cause overclosure of the jaws but typically leads to different problems like angular cheilitis and lack of proper function, rather than muscle soreness.
• C. Excessive muscular force on the denture: While excessive force can cause issues, it is usually secondary to improper fit or function, not a primary cause related to soreness.
• D. Repeated muscle trauma: This is uncommon with new dentures unless associated with improper extension or faulty design, but it is not the primary explanation in this case.

Key Takeaway:

Proper assessment of the vertical dimension and interocclusal space is crucial in denture fabrication to avoid muscular discomfort and ensure comfort during function.

 # RPI clasp in a distal extension cast partial denture:

A. Used for buccally tilted molar

B. Provides push type retention

C. Provides pull type retention

D. Is contraindicated

The correct answer is:

B. Provides push type retention

Explanation:

The RPI clasp (Rest, Proximal plate, I-bar) system in a distal extension removable partial denture provides push-type retention because the I-bar clasp moves in a downward direction towards the gingiva when the denture base moves occlusally during function. This ensures that forces are directed in a manner that minimizes torque on the abutment tooth and enhances tissue support.

Breakdown of Key Features:

1. Rest: Positioned mesially to redirect forces along the long axis of the abutment tooth.
2. Proximal Plate: Contacts the guiding plane to stabilize the denture and control path of insertion and removal.
3. I-bar clasp: Engages an undercut and moves gingivally (pushes) as the denture is seated or when occlusal forces displace the denture base.

The push-type action of the I-bar helps maintain a stress-relieving design by allowing movement and reducing torque on the abutment during function.