MDS PREP
Guiding planes on abutment teeth provide
1) Predictable clasp retention
2) Increased resistance towards horizontal movement
3) Transmit forces along long axis of tooth
4) Guides the key into the key way
Prosthodontics
Answer: 1
The main function of guiding planes is to provide a stable and predictable path for the RPD to follow during insertion and removal. This helps in achieving proper clasp retention, which is essential for the stability of the denture. While they also contribute to resistance towards horizontal movement and guiding the key into the key way, their primary purpose is to ensure clasp retention.
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.
In a complete denture patient, which of the following is likely to cause difficulty in apposing the lips?
1. Decreased VDO (vertical dimension of occlusion)
2. Failure to provide adequate interocclusal distance
3. Excessive interocclusal distance
4. Decreased nose-chin distance
Prosthodontics
Answer: 2
In a complete denture patient, which of the following is likely to cause difficulty in apposing the lips: failure to provide adequate interocclusal distance.
Loss of several teeth may result in
1. Change in the facial contour
2. TMJ disturbances
3. Periodontal disturbances
4. All of the above
Loss of several teeth may result in all of the above: change in the facial contour, TMJ disturbances, periodontal disturbances.
The distofacial border of the mandibular complete denture is limited by the action of
1. Masseter
2. Genioglossus
3. Geniohyoid
4. Mylohyoid
Prosthodontics
Answer: 1
The distofacial border of the mandibular complete denture is limited by the action of masseter.
Excessive application of pressure on the posterior portion of the occlusal rim during jaw relations results in
1. Anterior open bite
2. Posterior open bite
3. Anterior deep bite
4. Unbalanced occlusion
Prosthodontics
Answer: 1
Excessive application of pressure on the posterior portion of the occlusal rim during jaw relations results in an anterior open bite.
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.
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.