Prosthodontics Quiz: Trivia Exam!

The correct answer is "Gingivally" because when a bar clasp approaches an undercut, it moves towards the gingiva or the gum tissue. This is because the undercut is located on the tooth surface, closer to the gum line. Therefore, the bar clasp would need to move in a gingival direction in order to engage with the undercut and provide proper support and retention for a dental prosthesis.

Kennedy class II is the correct answer because it refers to a unilateral edentulous area located posterior to the remaining natural teeth, with the presence of missing teeth on both sides of the arch. In this classification, the edentulous area is bounded anteriorly by the remaining natural teeth and posteriorly by the edentulous area. This classification helps in determining the appropriate treatment plan for the patient, including the design of a removable partial denture.

The flexible third of the clasp is located below the height of contour. This means that it is positioned in such a way that it rests below the area where the natural teeth emerge from the gumline. This positioning allows the clasp to provide support and stability to the dental prosthesis without interfering with the natural teeth or causing discomfort to the patient.

A mandibular major connector with a half pear-shaped cross-section is known as a lingual bar. This type of major connector is used in partial dentures to provide stability and support to the prosthesis. The lingual bar is designed to rest on the lingual surface of the mandibular teeth and is shaped like a half pear, with the wider end towards the anterior region of the mouth. It helps distribute the forces evenly and prevents displacement of the denture during function.

The reciprocal arm is rigid and placed in the middle third of the crown. This means that the arm is not flexible and is securely attached to the crown in the middle portion. This placement allows for stability and support when the prosthesis is in use.

Minor connectors that support auxiliary rests should arise from the major connector at a right angle. This is because a right angle provides the most stable and secure connection between the major and minor connectors, ensuring proper support for the auxiliary rests. A right angle allows for better distribution of forces and minimizes the risk of dislodgement or movement of the auxiliary rests.

The horse shoe connector is the correct answer because it is a major connector used when anterior teeth need to be replaced. This type of connector is horseshoe-shaped and is designed to provide support and stability for the prosthetic teeth. It is commonly used in cases where there are missing teeth in the anterior region of the mouth. The horse shoe connector allows for proper distribution of forces and provides a comfortable fit for the patient.

Establishing guiding planes is the first step in surveying. Guiding planes are reference surfaces or lines that are established to guide the placement and design of restorations or prostheses. They provide a stable and accurate foundation for the restorative work by ensuring proper alignment, stability, and support. By establishing guiding planes, the surveyor can determine the ideal path of insertion and removal for the restoration, which is crucial for its success. This step helps in achieving accurate and predictable results in the subsequent stages of the surveying process.

An occlusal rest is a component of a removable partial denture that provides stability and support by contacting the remaining teeth and distributing vertical forces. It helps to prevent the denture from moving or dislodging during biting and chewing. This component is designed to bear the load of occlusal forces and transfer them to the supporting teeth, providing stability and preventing damage to the remaining teeth.

Indirect retainers are a part of the removable partial denture (RPD) that helps in protecting against the displacement of distal extension denture bases. They are designed to resist the rotational forces that can occur during functional movements of the denture. By providing stability and support to the RPD, indirect retainers prevent the distal extension denture bases from moving or tipping under occlusal forces. This helps in maintaining the proper fit and function of the denture, ensuring patient comfort and preventing damage to the oral tissues.

The correct answer is "Mesiodistally" because the apex of the rest seat in the incisal rest seat should point towards the long axis of the tooth in the mesiodistal direction. This ensures that the force applied to the tooth is distributed evenly along its long axis, providing stability and support for the dental prosthesis.

Dental implants provide a stable foundation for artificial teeth. Endosteal implants are embedded within the jawbone, subperiosteal implants rest on the jawbone beneath the gums, and transosteal implants go through the jawbone. These implants offer solutions for missing teeth, improving chewing function and aesthetics.

The minor connectors that support auxiliary rests are in a triangular cross section. This means that they have a shape that resembles a triangle when viewed from a cross-sectional perspective. This type of cross section provides stability and strength to the connectors, allowing them to effectively support the auxiliary rests. Circular cross sections may not provide the same level of stability, while the option of "either" suggests that both circular and triangular cross sections could be used, but the correct answer specifies triangular cross section.

The correct answer is "Ney surveyor" because the question is asking about the horizontal arm, which indicates a specific type or brand of surveyor equipment. Therefore, the correct answer would be the specific brand or type mentioned, which is "Ney surveyor."

In cases where there are large interproximal embrasures requiring indirect retention, a cingulum bar is used as the mandibular major connector. The cingulum bar is a type of major connector that is placed on the lingual surface of the mandibular anterior teeth. It provides stability and support to the removable partial denture by engaging the lingual undercuts and preventing displacement of the denture. This is particularly important in cases where there are large interproximal spaces, as it helps to distribute the forces evenly and maintain the stability of the denture.

Assuring intimate contact with tissue is necessary to make an impression of flabby tissue. This means that the impression material should come into direct contact with the tissue to accurately capture its shape and details. This ensures that the final impression is a true representation of the flabby tissue, allowing for accurate diagnosis and treatment planning.

Cingulum rest is a type of rest preparation that involves removing the lingual surface of a tooth to create a rest seat. This rest can only be prepared on the maxillary teeth, specifically on the lingual surface of the anterior teeth. It cannot be prepared on the mandibular teeth because they do not have a prominent lingual surface like the maxillary teeth. Therefore, the correct answer is "Mandibular teeth."

The palatal strap major connector is used in both unilateral distal extension partial dentures and bilateral short span edentulous spaces in Kennedy class III. This major connector design provides stability and support to the partial denture by connecting the posterior teeth on both sides of the arch. It helps distribute the occlusal forces evenly and prevents rotation or movement of the denture. The palatal strap major connector is versatile and can be used in different clinical situations depending on the specific needs of the patient.

The occlusal rest should ideally measure 1/2 of the buccolingual width. This means that the occlusal rest should be approximately half the width of the tooth from the buccal (cheek) to the lingual (tongue) side. This measurement is important for providing proper support and stability for a dental prosthesis or restoration. By having a rest that is half the buccolingual width, it ensures that there is enough surface area for the restoration to securely fit and distribute forces evenly during occlusion.

Maintaining a stable base-tissue relationship is an effective means of limiting applied loads to abutment teeth in distal extension partial dentures. This is because a stable base-tissue relationship ensures proper distribution of forces and reduces the stress on individual abutment teeth. By providing support and stability to the denture, the base-tissue relationship helps prevent excessive forces from being concentrated on specific teeth, which can lead to damage or discomfort. Therefore, maintaining a stable base-tissue relationship is crucial for protecting abutment teeth and ensuring the longevity and functionality of the partial denture.

When a retentive undercut on abutment teeth is located adjacent to an edentulous space, both a reverse clasp and a circlet clasp can be used. A reverse clasp is used when the undercut is located on the distal surface of the abutment tooth, while a circlet clasp is used when the undercut is located on the mesial surface. Therefore, in this specific scenario, both types of clasps can be utilized.