At the cementoenamel junction, which of the following events takes place_____________?
Show answer Hide answer
Answer: D. All of the above
Explanation
Histological studies show that the cementoenamel junction exhibits multiple distinct architectural relational patterns. Cementum may meet enamel in an end-to-end butt joint or overlap the enamel surface. In a notable percentage of cases, a small gap exists where dentin remains exposed between them. The cementoenamel junction marks the anatomical boundary where the tooth crown meets the root. Epithelial root sheath breakdown initiates cementogenesis in close proximity to the newly formed enamel. Microscopic variations at this junction occur frequently even on different sides of the same tooth.
Exposed dentin at the cementoenamel junction often leads to cervical dentin hypersensitivity in patients. Periodontists evaluate this junction when assessing recession and root coverage surgical procedures. Restorative margins are often placed near this junction, requiring precise clinical management. Stating that cementum only meets enamel ignores the well-documented overlapping and gap variations. Claiming cementum only overlaps enamel contradicts established histological findings of end-to-end contacts. Stating cementum never meets enamel fails to account for the common butt-joint relationship.
Related questions
Q1. Salivary gland secretion differs from other glands because its output is uniquely regulated by___________?
Show answer Hide answer
Answer: B. Nerves
Salivary glands lack significant hormonal regulation and depend almost exclusively on autonomic nerve stimulation. Both sympathetic and parasympathetic nervous pathways coordinate the volume and composition of saliva. Ne...
Q2. Which salivary enzyme is responsible for cell wall lysis____________?
Show answer Hide answer
Answer: A. Lysozhyme
Lysozyme is a potent antimicrobial enzyme found in human saliva. It hydrolyzes peptidoglycan components within bacterial cell wall structures. This enzymatic action leads directly to bacterial lysis and death. Saliva con...
Q3. An estimate of the total number of enamel rods in a maxillary molar is approximately how many?
Show answer Hide answer
Answer: D. 12 million
Histological calculations and surface area measurements estimate roughly twelve million enamel rods populate a maxillary molar. Large multirooted posterior teeth possess extensive crown surfaces that require millions of...
Q4. In an occlusal view of a permanent maxillary second molar, which line angle area appears most acute?
Show answer Hide answer
Answer: A. Mesiofacial
The mesiofacial line angle of a maxillary second molar forms a sharper, more acute corner. Crown geometry causes the mesiofacial angle to be noticeably less rounded than other corners. Anatomical convergence patterns on...
Q5. Basal bone refers to____________?
Show answer Hide answer
Answer: A. That part of the bone embracing apices of root of teeth
Basal bone is the structural foundation of the jaw containing tooth apices. It remains relatively stable throughout life compared to alveolar bone. This bone tissue supports the alveolar process containing the teeth. The...
Q6. Disturbances during which phase lead to the formation of atypical or osteodentin____________?
Show answer Hide answer
Answer: B. Histodifferentiation
Histodifferentiation is the developmental stage where unspecialized cells transform into distinct functional formative tissue types. Disruptions during this critical phase can cause odontoblasts to differentiate abnormal...