MDS PREP
What forces best accomplish orthodontic tooth movement?
Prosthodontics Answer: 3
1. Heavy and continuous
2. Heavy and intermittent
3. Light and continuous
4. Light and intermittent
What forces best accomplish orthodontic tooth movement: light and continuous.
In anterior teeth "rests" are ideally prepared and located on
1) Incisal edges
2) Lingual surfaces
3) Mesial surfaces
4) Distal surfaces
Prosthodontics
Answer: 2
In anterior teeth, "rests" are ideally prepared and located on the lingual surfaces. This is because the lingual surfaces provide better support for the denture and distribute the occlusal forces more evenly across the palatal mucosa, reducing the risk of denture movement and discomfort.
After extraction and healing, the maxillary denture encloses severe bony undercuts in both the tuberosities. The best treatment for this condition
1. Reduce the undercuts on one side to allow the path of insertion
2. Reduce both the undercuts so that no bony undercuts exists anywhere on the ridge
3. Use selective pressure technique to displace the tuberosity
4. Do the surgical trimming of the ridge and allow the undercuts to exist
Prosthodontics
Answer: 2
After extraction and healing, the maxillary denture encloses severe bony undercuts in both the tuberosities. The best treatment for this condition is to reduce both the undercuts so that no bony undercuts exist anywhere on the ridge.
A tooth that has been out of function for a long time is used as abutment for a FPD. The continuous pain resulting from the tooth is mainly due to
1) Irritation of the pulp during preparation for retainer
2) Traction of the periodontal ligament fibres
3) Deflective occlusal contacts
4) Periapical inflammation
Prosthodontics
Answer: 2
When a tooth has been out of function for an extended period, it can experience changes in the periodontal ligament that supports it. The periodontal ligament is a fibrous connective tissue that connects the tooth to the bone and allows for a certain degree of movement. This movement is essential for the health of the ligament and the surrounding tissues. When a tooth is no longer subjected to the normal forces of biting and chewing, the periodontal ligament fibres can become weak or atrophied.
When this tooth is then used as an abutment for a fixed partial denture (FPD), it is once again exposed to the functional stresses that were previously absent. These stresses can cause traction on the periodontal ligament fibres, leading to pain and discomfort. The pain is mainly due to the sudden reintroduction of forces to the ligament that it is not accustomed to handling.
Main advantage of RPD over fixed bridge in replacing bilateral lost teeth
1) Cross arch stabilisation
2) Aesthetics
3) Less expensive
4) Comfort of the patient
Prosthodontics
Answer: 1
Cross Arch Stabilization: RPDs provide cross arch stabilization by distributing the forces of mastication more evenly across the remaining natural teeth and the edentulous (toothless) regions of the arches. This is particularly beneficial when there are missing teeth on both sides of the mouth. An RPD connects to the teeth on both sides of the mouth, which helps maintain the alignment and stability of the remaining dentition. In contrast, a fixed bridge typically relies on the adjacent natural teeth for support, which can result in increased load and stress on these abutment teeth. This additional stress can potentially lead to issues such as tooth decay, root fracture, or periodontal disease if not managed properly.
Identify the wrong statement regarding salivary scan
1. Specifity is less than sialograms
2. Salivary scan is functional whereas sialagram is anatomical
3. When both are indicated scan is done first
4. When both are indicated sialogram is done first
Prosthodontics
Answer: 4
Identify the wrong statement regarding salivary scan: When both are indicated, sialogram is done first.
In a complete denture, the position of the mandibular first premolar is
determined by the
1. mental foramen
2. adjacent second premolar
3. termination of the mylohyoid ridge
4. mandibular canine
Prosthodontics
Answer: 4
Explanation: In the arrangement of teeth in a complete denture, the
mandibular first premolar is typically positioned with its mesial aspect in
contact with the lateral aspect of the mandibular canine. This is part of the
denture setup to ensure proper occlusal relationships and aesthetics.
Before construction of the complete denture, patient"s natural dentition is evaluated because it helps in
1. Establishing vertical dimension
2. Arranging the teeth in balanced occlusion
3. Selection of form, shape, and size of the artificial teeth
4. All of the above
Prosthodontics
Answer: 3
Before construction of the complete denture, the patient's natural dentition is evaluated because it helps in all of the above: establishing vertical dimension, arranging the teeth in balanced occlusion, selection of form, shape, and size of the artificial teeth.