Dental Space

هسا راح ننشر مجموعة اسئلة محاضرة + كيس كلينكل Management of deep seated caries 6%

Case -1- 43 .During cavity preparation on a mandibular molar, a dental student notices that the dentin surface appears dull and slightly yellow, and the explorer tends to catch slightly on the surface. To improve adhesion, they decide to etch the dentin before placing a resin-based composite. Which of the following best explains why this etched dentin becomes a challenge for bonding? a. Dentin becomes brittle after etching and fractures easily b. Etching decreases the tensile strength of enamel rods c. Acid etching removes the smear layer, increasing dentinal permeability and outward fluid flow d. The etched dentin becomes too dry to bond effectively e. Etching causes permanent damage to odontoblasts and leads to necrosis

40. Which of the following statements about dentinal tubules is CORRECT? a. They extend from the DEJ to the cementoenamel junction. b. Each tubule is filled with an odontoblastic nucleus. c. They are lined by intertubular dentin, which is more mineralized than peritubular dentin. d. Tubule diameter increases closer to the pulp. e. In mature dentin, the odontoblastic process reaches the DEJ.

39. According to the hydrodynamic theory, dentin sensitivity occurs primarily due to: a. Direct stimulation of nerve endings within outer dentin b. Heat-induced expansion of dentin matrix c. Rapid fluid movement within dentinal tubules stimulating nerve endings d. Chemical reaction between dentinal tubules and restorative materials e. All of the above

38. Which of the following best explains why dentin is less likely to fracture compared to enamel? a. Dentin contains nerve endings that alert the pulp to mechanical stress b. Dentin has higher mineral content than enamel c. Dentin is more flexible and provides elastic support to enamel d. Dentin is protected by a thicker layer of enamel e. All of the above