DDS Trivia 4

Question 1

Which Angle's classification describes a malocclusion where the mesiobuccal cusp of the upper first molar occludes anterior to the buccal groove of the lower first molar?

Accepted Answer

Class II

Answer

Angle Class II malocclusion is defined by a distal relationship of the mandible, where the maxillary first molar is ahead (mesial) of its ideal position relative to the mandibular first molar.

Question 2

Which tooth structure is formed last during tooth development?

Accepted Answer

Cementum

Answer

Cementum is deposited by cementoblasts after root formation begins, which occurs after enamel and dentin have already been laid down by ameloblasts and odontoblasts.

Question 3

What does the acronym 'BRONJ' refer to in dental practice?

Accepted Answer

Bisphosphonate-Related Osteonecrosis of the Jaw

Answer

BRONJ (now termed MRONJ—Medication-Related Osteonecrosis of the Jaw) is exposed necrotic bone in patients taking bisphosphonates or antiresorptive agents.

Question 4

Which primary (deciduous) teeth are the last to erupt in the oral cavity?

Accepted Answer

Maxillary second molars

Answer

The maxillary second primary molars are typically the last deciduous teeth to erupt, around 24–33 months of age, completing the primary dentition of 20 teeth.

Question 5

What is the scientific name of the primary pathogen responsible for early childhood caries (ECC)?

Accepted Answer

Streptococcus mutans

Answer

Streptococcus mutans is the principal bacterium responsible for early childhood caries due to its ability to produce lactic acid and adhere to tooth surfaces via glucans.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Trivia 4