181. The apical foramen of a fully developed permanent tooth is usually lined by_____________? A. Dentin B. Cementum C. Epithelial rest cells D. The Epithelial diaphragm ✅ The correct answer is option B. Cementum.
182. Odontoblasts are derived from______________? A. Undifferentiated mesenchymal B. Histocytes C. Macrophages D. Lymphocytes ✅ The correct answer is option A. Undifferentiated mesenchymal.
183. Dendritic cell located in the stratified squamous keratinizing epithelium of the oral cavity include_____________? A. Keratinocytes B. Mast cells C. Melanocytes D. Myoepithelila cells ✅ The correct answer is option C. Melanocytes.
184. During the formation of primary teeth_______________? A. Enamel forms more cervically than dentin B. Enamel forms faster than dentin C. Dentin forms faster than enamel D. Processes of their cells remain in content with each other ✅ The correct answer is option C. Dentin forms faster than enamel.
185. Hunter Schreger band are____________? A. Dark and light bands of enamel seen in longitudinal ground section B. Dark and light bands of enamel seen in horizontal ground section C. Dark and light brands of dentin seen in longitudinal section D. Dark and light bands of dentin seen in horizontal ✅ The correct answer is option A. Dark and light bands of enamel seen in longitudinal ground section.
186. Blunt cell processes seen on the developing ameloblasts are celled as________________? A. Tomes fibres B. Tomes layer C. Tomes processes D. Odontoblastic processes ✅ The correct answer is option A. Tomes fibres.
187. Age changes in periodeontal ligament include which of the following ? A. Increased fibroplasia B. Increased vascularity C. Increased thickness D. Decreased in number of cementicles ✅ The correct answer is option A. Increased fibroplasia.
188. The formation of the dental lamina is initiated by______________? A. Forebrain B. Rathke’s pouch C. Neural crest cells D. Odontoblasts ✅ The correct answer is option C. Neural crest cells.
189. Nutrition for ameloblasts after 1st layer of enamel is laid is______________? A. Dental sac B. Odontoblastic process C. Ree D. Dental Papilla ✅ The correct answer is option A. Dental sac.
190. Which of the following statement is false______________? A. Resorption of roots of deciduous incisors and canines begins on their lingual surfaces B. Resorption of roots of deciduous molars begins on their inner surfaces C. Shedding of deciduous teeth is delayed in the absence of their successor teeth D. None of the above ✅ The correct answer is option D. None of the above.