Trivia Flashcards

Which periodontal fiber group runs from the alveolar crest obliquely to the cementum in an apical direction?

Answer: Oblique fibers

Oblique fibers are the most numerous PDL fibers, running from alveolar bone coronally to insert into cementum, resisting axial forces.

Which radiographic technique provides the most accurate image of the true mesiodistal width of interproximal bone loss?

Answer: Bitewing radiograph

Bitewing radiographs show the crestal bone of both arches with minimal distortion, making them optimal for assessing interproximal bone levels.

In operative dentistry, a beveled cavosurface margin is indicated for which restorative material?

Answer: Cast gold

Beveled cavosurface margins increase the surface area of the gold-tooth interface and improve marginal seal for cast gold restorations.

Which immunoglobulin class is predominant in saliva and provides the first line of mucosal defense?

Answer: IgA (secretory)

Secretory IgA (sIgA) is the predominant antibody in saliva, resisting proteolysis and neutralizing pathogens on mucosal surfaces.

The Koplik spots seen in measles are pathognomonic lesions found on which oral surface?

Answer: Buccal mucosa opposite the lower molars

Koplik spots appear as small white papules on the buccal mucosa near the lower molars and precede the skin rash of measles.

Which material property describes a material's resistance to permanent deformation under load?

Answer: Hardness

Hardness is defined as a material's resistance to permanent surface deformation or indentation, commonly measured by Vickers or Brinell scales.

Which embryonic structure gives rise to the enamel organ?

Answer: Dental lamina

The dental lamina, an ingrowth of oral ectoderm, gives rise to the enamel organ which produces enamel via ameloblasts.