Prosthodontic Quiz- Round 2

Acid etching is a dental technique used to create a rough surface on the enamel of a tooth, which helps in bonding dental materials such as sealants or composite resin. The etchant used in this process is usually 20% phosphoric acid. When applied to the enamel surface for one minute, the acid creates microscopic roughness, increasing the surface area and improving the bond strength of the dental material. After etching, the etchant should be washed away with water, not phosphoric acid as mentioned in the answer.

A loss in vertical dimension in complete denture will cause the mandible to move forward in relation to the upper jaw. This is because the loss in vertical dimension leads to a decrease in the space between the upper and lower jaws. As a result, the mandible will move forward in an attempt to find a stable and comfortable position. This forward movement helps to compensate for the reduced vertical dimension and maintain proper occlusion between the upper and lower teeth.

The most widely used rpd classification is Kennedy.

A semi adjustable articulator is a dental instrument used to simulate the movement and positioning of the jaws. It allows for limited adjustments to be made to replicate the patient's jaw movements and occlusion. This type of articulator is commonly used in dental laboratories for the fabrication of dental prosthetics, such as crowns and bridges. Unlike a fully adjustable articulator, which allows for more precise adjustments, a semi adjustable articulator is less complex and more cost-effective. Therefore, the use of a semi adjustable articulator is a practical choice for many dental professionals.

Increasing the Vertical Dimension of Occlusion (VDO) refers to the increase in the distance between the upper and lower jaws. This can be done through various dental procedures. Perleche, also known as angular cheilitis, is a condition characterized by cracked corners of the mouth. It is not directly related to the VDO and increasing it would not cause perleche. Therefore, the correct answer is perleche.

Bennett movement of the mandible refers to the lateral bodily movement of the lower jaw. This movement occurs when the mandible slides sideways to the left or right, allowing for proper alignment and function of the teeth during chewing and speaking. It is an important aspect of normal jaw movement and is necessary for maintaining a balanced occlusion.

Silverman suggested the closest speaking space.

The correct answer is "di-lok tray". The other options mentioned - pindex, accutrac, and dowel pin - do not refer to any specific die system. Therefore, the di-lok tray is the only option that can be identified as a die system based on the given information.

Reline is a process in which the tissue surface of a denture is resurfaced to improve its fit and stability without changing the occlusion or the way the upper and lower teeth come together. This procedure is done when the denture becomes loose or uncomfortable due to changes in the underlying bone and soft tissues. It involves adding a new layer of material to the tissue surface of the denture to restore its fit and function. Therefore, relining is the correct answer as it specifically addresses the repair of the denture without altering the occlusion.

The statement "Major connector should cross gingival margin diagonally" is false. The major connector in a dental prosthesis should not cross the gingival margin diagonally. It should be designed in a way that it does not impinge on or irritate the gingival tissues. Instead, it should be placed in a manner that ensures proper support and stability of the prosthesis without causing any harm to the surrounding tissues.

Basal implant is the correct answer. Basal implants are a type of dental implant that is anchored in the basal bone, which is the dense bone located at the base of the jaw. Unlike conventional implants, which rely on the available bone, basal implants use the basal bone for support. This makes them suitable for patients with insufficient bone volume or quality. Basal implants provide stability and can be immediately loaded, reducing the treatment time compared to traditional implants. They are a reliable option for patients who require dental implants but have limited bone structure.

A direct sinus lift is a procedure used in implant dentistry to increase the amount of bone in the upper jaw. It involves creating a small window in the sinus membrane and lifting it to make space for bone grafting material. This procedure is typically performed when there is not enough bone height in the posterior maxilla to support dental implants. By lifting the sinus membrane and adding bone grafts, the bone volume is increased, providing a stable foundation for implants.

An orbital prosthesis is a type of facial prosthesis that is specifically designed to replace the missing or damaged eye and surrounding structures in the eye socket (orbit). It is custom-made to fit the patient's individual anatomy and is typically made from materials like silicone or acrylic. The orbital prosthesis helps to restore the appearance of the eye and improve the patient's overall facial symmetry.

The correct answer is "Is a lateral molar curve with convexity facing downwards." This means that the curve of Monson refers to the curvature of the occlusal surface of the molars in the lateral aspect of the dental arch. The convexity facing downwards indicates that the curve is higher on the buccal (cheek) side and lower on the lingual (tongue) side. This curve helps to distribute the forces of occlusion evenly and maintain proper alignment of the teeth.

Dicor is a ceramic material which is castable. This means that it can be shaped and molded into various forms before hardening. Unlike other ceramic materials, Dicor has the unique property of being able to be cast into different shapes, making it versatile and suitable for a variety of applications.

Boron carbide has the maximum hardness among the given options. Boron carbide is a compound made up of boron and carbon atoms, and it is known for its exceptional hardness. It has a Mohs hardness of 9.3, which is higher than that of sand, emery, and silicon carbide. This high hardness makes boron carbide an excellent abrasive material, often used in industrial applications for grinding, cutting, and polishing hard materials.

The fovea palatine are situated in the soft palate. The soft palate is the flexible, muscular part of the roof of the mouth that extends beyond the hard palate. The fovea palatine are small depressions or pits located in this area. They are important for the sense of taste and help to detect and perceive different flavors and textures of food.

Polysulphide impression materials can be electroplated without risk of distortion. This is because polysulphide materials have good dimensional stability and can withstand the electroplating process without undergoing any significant changes in shape or size. On the other hand, condensation silicone, addition silicone, and polyether materials may be susceptible to distortion during electroplating due to their lower dimensional stability. Therefore, polysulphide is the best choice for electroplating impressions.

The correct answer is Gysi. Gysi was the one who proposed the concept of lingualised occlusion. Lingualised occlusion is a type of occlusion where the posterior teeth contacts occur on the lingual cusps, rather than the buccal cusps. This concept is often used in dentistry to improve stability and balance in dentures.

A facebow is a dental instrument that is used to transfer the spatial relationship of the patient's maxillary arch to an articulator. It helps to accurately reproduce the position of the upper jaw in relation to the temporomandibular joint and the axis of rotation. The axis orbital plane refers to the imaginary plane that passes through the patient's orbit and is used as a reference point for the facebow transfer. Therefore, the facebow is used to transfer the axis orbital plane.