MDS PREP
Acrylic resin posterior teeth along with porcelain anterior teeth should not be
used in complete dentures because
1. it produces resorption of posterior residual ridge as acrylic teeth wear
2 they cause resorption of anterior residual ridge
3. the combination produces harmful stress concentrations
4 This combination can be used
Prosthodontics
Answer: 2
Explanation: The combination of acrylic resin posterior teeth
and porcelain anterior teeth can lead to differential wear and stress
concentrations, which may cause resorption of the anterior residual ridge.
Porcelain teeth are harder and can create more stress on the underlying bone
compared to acrylic teeth, leading to potential resorption. Therefore, option 2
is the correct answer, as it highlights the negative impact on the anterior
ridge.
A pantograph is a record of the patient’s
1. jaw movements
2. speech pattern
3. muscular con
4. maxillary movements
Prosthodontics
Answer: 1
A pantograph is a record of the patient’s jaw movements.
The retention and stability of a complete denture may be compromised by
1. large and bulbous tuberosities
2. a deep lingual vestibule
3. absence of mylohyoid ridge
4. a high V- shaped palate
Prosthodontics
Answer: 4
Explanation: A high V-shaped palate can compromise the retention and
stability of a complete denture because it reduces the surface area for the
denture to contact and conform to the palate. This results in less suction and a
smaller seal, making the denture more likely to dislodge during function.
Centric relation is best defined as
1. The relation of the mandible to the maxillary when the teeth are in centric occlusion
2. The retruded contact position (RC)
3. The relation of the mandible to the maxilla when the condyles are in their most posterior position in the glenoid fossae
4. None of the above
Prosthodontics
Answer: 3
Centric relation is best defined as the relation of the mandible to the maxilla when the condyles are in their most posterior position in the glenoid fossae.
The Camper’s plane passes from the
1. lateral commissure of the mouth to the inferior edge of the ear
2. orbitale to the middle of the tragus of the ear
3. ala of nose to the superior edge of the tragus of the ear
4. outer canthus of eye to the most poste rior point on the tragus of the ear
Prosthodontics
Answer: 3
The Camper’s plane passes from the ala of the nose to the superior edge of the tragus of the ear.
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.
The primary purpose of rinsing the algina impression in watery mix of gypsum is to
1. Increase the gel strength
2. Prevent further gelatio
3. To decrease the shrinkage of the impression
4. To remove the residual saliva on the impression
Prosthodontics
Answer: 4
The primary purpose of rinsing the alginate impression in a watery mix of gypsum is to remove the residual saliva on the impression.
Which of the following is not desirable in complete denture occlusion
1 Minimum occlusal contact areas for reduced pressure in comminuting food
2 Functional lever balance by favorable tooth to ridge crest position
3 Balanced occlusal contacts bilaterally for all eccentric movements
4 Anterior incisal contacts during all posterior masticatory functions and para
function
Prosthodontics
Answer: 4
Explanation: Anterior incisal contacts during posterior
masticatory functions are not desirable because they can lead to instability and
improper function of the complete denture. Ideally, posterior teeth should
provide the primary occlusal contacts during chewing, while anterior teeth
should not interfere with these functions. This helps maintain a balanced
occlusion and prevents excessive wear or damage to the denture.