72637

91126

A white patch on the maxillary ridge, especially in an older patient, should be treated with suspicion for a potentially premalignant or malignant lesion. An immediate biopsy is necessary to establish a definitive diagnosis before proceeding with any prosthetic treatment like preparing a denture.

83616

The filament in the X-ray tube is heated by the step-down low voltage transformer.

24081

Replacement resorption results in ankylosis. This process involves: 1) Loss of periodontal ligament due to trauma or infection, 2) Direct contact between root surface and alveolar bone, 3) Osteoblasts lay down bone tissue directly on root surface, 4) Root dentin is gradually replaced by bone tissue, 5) Tooth becomes fused to surrounding bone (ankylosis). This condition is irreversible and eventually leads to complete replacement of root structure with bone. Pain and periapical abscess are not typical consequences of replacement resorption itself.

74555

An important advantage of the I-bar retainer in the RPI concept is that since the tooth contour is not altered, food accumulation against the tooth surface is minimized. The I-bar approaches the undercut from the gingival direction without requiring tooth modification, maintaining natural contours that promote self-cleansing.

81389

In a bilateral distal extension RPD, abutment teeth are crucial for the stability and support of the prosthesis. However, it is not ideal to have retention buccally on one side and lingually on the other side as this can lead to tipping and rotation of the denture during function, compromising its stability. Instead, both buccal and lingual retention is preferred for a more balanced and predictable outcome.

80760

Corticosteroids are anti-inflammatory agents that can be used to manage acute pulpal pain when immediate pulp extirpation (removal) is not feasible. Their mechanism of action involves reducing inflammation within the pulp tissue, thereby alleviating pain.

27727

The distal root of the mandibular first molar is often thinner on the buccal aspect due to its concavity/shape, making the buccal wall the most common site for perforation during post-space preparation.

54404

In a young patient with immature root development and vital pulp exposure, pulpotomy preserves radicular pulp vitality allowing continued root development (apexogenesis). Pulpectomy would halt root formation.

47668

The wrong statement about obturation is that silver cones are recommended for canals in which posts are placed. Actually: 1) Silver cones ARE recommended for fine tortuous canals where gutta-percha placement is difficult, 2) McSpadden compactors DO operate at 6000-10,000 rpm, 3) Silver cones are NOT recommended for post preparation because they are difficult to remove and can corrode, 4) Gutta-percha is preferred for post cases as it can be easily sectioned and removed. Silver cones create problems during post preparation due to their metallic nature and removal difficulty.