MDS PREP
Which of the following movement(s) is/are involved in the opening of the mouth?
1. Only hinge
2. Only translation
3. Hinge followed by translation
4. Translation followed by hinge
Prosthodontics
Answer: 3
The movement involved in the opening of the mouth is hinge followed by translation.
Guiding planes
1) Determine the path of insertion
2) Determine the path of removal
3) Assure predicatable clasp design
4) All of the above
Prosthodontics
Answer: 4
Guiding planes are flat, polished surfaces on the abutment teeth that guide the RPD into place. They are crucial for the predictable placement of retentive elements such as clasps and for ensuring that the forces are transmitted along the long axis of the teeth, minimizing horizontal movements. Additionally, they help in the overall stability and function of the denture.
Because of the great length of this clasp it must be designed with additional sup port, usually in the form of an auxiliary bracing arm. Which clasp is this?
1. Ring clasp
2, Combination clasp
3. Fish hook clasp
4. Multiple circlet clasp
Prosthodontics
Answer: 1
A ring clasp is a type of clasp used in removable partial dentures that encircles the abutment tooth. Due to its length and the potential for movement, it often requires additional support, typically provided by an auxiliary bracing arm, to ensure stability and retention of the prosthesis. This design helps distribute forces more evenly and prevents dislodgment during function.
All of the following are types of face bows, except
1 earpiece face bow
2 twirl bow
3. shaft face bow
4. facia face bow
Prosthodontics
Answer: 3
Types of Face Bows
1. Earpiece Face Bow
Description: This type of face bow has earpieces that
rest against the patient's ears. It is designed to record the relationship
of the maxilla to the hinge axis of the mandible.
Use: It is commonly used in clinical practice for
obtaining accurate records of the maxillary arch in relation to the TMJ. The
earpieces help in aligning the face bow with the patient's anatomical
landmarks.
2. Twirl Bow (or Twirl Face Bow)
Description: The twirl bow features a unique design
that allows for easy adjustment and positioning. It typically has a rotating
mechanism that helps in aligning the bow with the patient's facial midline.
Use: This type is particularly useful for obtaining a
more precise relationship of the maxilla to the TMJ, especially in cases
where the anatomy may be challenging to assess.
3. Bite Fork Face Bow
Description: This face bow incorporates a bite fork
that is used to capture the occlusal relationship of the maxillary arch. The
bite fork is attached to the face bow and is used to record the patient's
bite.
Use: It is often used in conjunction with other face
bows to ensure that the occlusal plane is accurately recorded in relation to
the TMJ.
4. Facial Bow
Description: This is a more general term that can refer
to any face bow used to record facial relationships. It may include various
designs and configurations.
Use: Facial bows are used in different prosthodontic
applications, including complete dentures, partial dentures, and fixed
prosthodontics.
5. Shaft Face Bow
Description: This type of face bow is less common and
may refer to a design that includes a shaft for stability and alignment.
Use: It is used in specific clinical situations where a
more rigid structure is needed to maintain the relationship of the maxilla
to the TMJ.
6. Kavo Face Bow
Description: This is a specific brand of face bow that
is designed for ease of use and accuracy. It often features adjustable
components for better alignment.
Use: Kavo face bows are used in various prosthodontic
procedures to ensure accurate records of the maxillary arch.
7. Hanau Face Bow
Description: The Hanau face bow is a well-known design
that allows for precise recording of the maxillary arch's relationship to
the TMJ. It typically includes a bite fork and adjustable arms.
Use: It is widely used in dental laboratories and
clinics for creating accurate dental prostheses.
Decreased vertical dimension of occlusion (increased interocclusal space) results in all of the following except
1. Loss of muscle power
2. Sagging of the corners of the mouth
3. Senile appearance
4. Increase in the masticatory efficiency
Prosthodontics
Answer: 4
Decreased vertical dimension of occlusion results in all of the following except an increase in masticatory efficiency.
Penumbra in a processed film is related to
1. Magnification
2. Sharpness of image
3. Detail of the image
4. All of the above
Prosthodontics
Answer: 4
Penumbra in a processed film is related to all of the above: magnification, sharpness of image, detail of the image.
What does the term "height of contour" refer to in dental
surveying?
1) The lowest point of a tooth
2) The greatest circumference of a tooth at a selected axial position
3) The average height of all teeth
4) The position of the gum line
Prosthodontics
Answer: 2
The height of contour is defined as the line encircling a tooth that designates its greatest circumference at a specific axial position.
Size of the bur for preparing lingual rest seat for an RPD is
1) 1/10th inch
2) 1/4th inch
3) 1/2 inch
4) 1 inch
Prosthodontics
Answer: 2
Explanation:
The appropriate size of the bur for preparing a lingual rest seat for a removable partial denture (RPD) is typically 1/4th inch. This size allows for the proper shaping and contouring of the rest seat to ensure a secure fit for the prosthesis.