MCQ Flashcards

Which periodontal fiber group runs parallel to the long axis of the tooth and resists intrusive forces?

Answer: Apical fibers

Apical fibers radiate from the apex of the root to the surrounding alveolar bone and resist intrusive (axial) loading forces applied to the tooth.

Ranula is a mucous retention or extravasation phenomenon most commonly associated with which salivary gland?

Answer: Sublingual gland

Ranulas form in the floor of the mouth primarily from the sublingual gland; plunging ranulas extend through the mylohyoid muscle.

Which disinfectant is most effective for sterilization of heat-sensitive dental instruments?

Answer: Glutaraldehyde 2% (10-hour immersion)

2% activated glutaraldehyde achieves sterilization after a 10-hour immersion and is one of the few chemical agents capable of destroying all microbial life including spores.

Amelogenesis imperfecta affects which dental structure and its inheritance pattern includes:

Answer: Enamel; X-linked, autosomal dominant, or autosomal recessive

Amelogenesis imperfecta affects enamel formation and can follow X-linked, autosomal dominant, or autosomal recessive inheritance depending on the gene involved.

The zone of coagulation necrosis in thermal injury to pulp tissue, followed by the zone of stasis, is BEST described as:

Answer: Jackson's burn zones applied to pulp thermal injury

Jackson's burn model (coagulation, stasis, hyperemia) describes the three concentric zones of tissue injury from thermal trauma, applicable to heat-induced pulp damage.

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) most frequently occurs in which location?

Answer: Posterior mandible

BRONJ occurs most commonly in the posterior mandible, particularly in the molar region, likely due to thinner mucosa, less vascularity, and greater mechanical stress.

During the mixed dentition stage, the 'ugly duckling' stage refers to:

Answer: Flaring of maxillary central incisors with midline diastema before canine eruption

The 'ugly duckling' stage is a normal developmental phenomenon where maxillary central incisors flare distally and create a midline diastema, which usually self-corrects when the canines erupt.