NBDHE Comprehensive Review Questions with 100% Correct Answers, Graded to Pass (Darby and Walsh 9th Edition)

The tissue(s) that have nerve innervation are: a. Dentin b. Pulp and dentin c. Pulp and periodontal ligament d. Cementum e. All of the above - C. The pulp and the periodontal ligament have nerve innervation. The free unmyelinated nerve endings of the pulp can sense: a. Hot b. Cold c. Pressure d. Pain e. All of the above - D. The free unmyelinated nerve endings of the pulp tissue can sense pain only. It cannot distinguish between hot or cold. It cannot distinguish the sensation of pressure. All stimuli are interpreted as a pain perception. The encapsulated nerve endings are responsible for registering pressure changes Nonsuccedaneous permanent molars develop from buds that grow from: a. A successional dental lamina. b. Primary tooth buds. c. The posterior part of palatal shelves. d. Extension of the primary second molar's dental lamina. - D. Six permanent molars per dental arch develop from a posterior extension of the dental lamina What is the angled part of the ameloblast that secretes the enamel matrix? a. Inner enamel epithelium b. Repolarized preameloblasts c. Tomes' process d. Disintegrating basement membrane - C. The enamel matrix is directly secreted from Tomes process The pink labial mucosa or buccal mucosa meets the redder _____ at the mucobuccal fold. a. Marginal gingiva b. Attached gingiva c. Alveolar mucosa - C. The pink labial mucosa or buccal mucosa meets the redder alveolar mucosa at the mucobuccal fold deep with the vestibular fornix. The outer cells of the dental papilla are induced to differentiate during tooth development into: a. Pulp tissue b. Preameloblasts c. Odontoblasts d. Cementoblast - C. Outer cells differentiate into dentin-secreting cells, odontoblasts Which stage of tooth formation occurs for the primary dentition during the 11th and 12th week of prenatal development? a. Bell Stage b. Initiation Stage c. Cap Stage d. Bud Stage - A. The eleventh and twelfth week of prenatal development is the fourth stage of Odontogenesis the Bell Stage What is connective tissue derived from during prenatal development? a. Ectoderm b. Endoderm c. Neural crest cells d. Mesoderm - D. Connective tissue is derived from Mesoderm during prenatal development Enamel _____form the crystalline structural unit of enamel. a. Tubules b. Granules c. Rods d. Cuticles - C. Structural unit of Enamel The patient's mother was informed the multiple carious lesions caries on her maxillary molars had progressed into the dentin. Caries in the dentin of the tooth progresses through the a. Interglobular dentin b. Dentinal tubule c. Secondary dentin d. Predentin - B. Bacteria smaller than dentinal tubules enter the tubules and destroy the odontoblastic processes (dentinal fibers) and follow the course to pulp. Enamel hypocalcification is a type of enamel dysplasia that involves: a. an increased number of ameloblasts b. reduction in the quantity of enamel matrix c. grooves and pitting on the enamel surface d. interference in the metabolic processes of ameloblasts - B. reduction in the quantity of enamel matrix During the 4th week of embryonic life, the tongue develops from several swellings arising on the internal aspect of brachial arches 1-4 (pouches). Which swellings form the body of the tongue? a. Branchial arch 1 b. Branchial arches 2, 3, and part of 4 c. Branchial arch 4 d. Thyroid gland - A. Branchial arch 1 forms two lateral swellings and one medial swelling (tuberculum impar) to form the body of the tongue What histologic structure(s) comprise(s) healthy attached gingiva? a. Circular fibers b. Rete pegs c. Connective tissue papilla d. Fibroblasts e. All of the above - e. All of the above What type of epithelium comprises attached gingiva? a. Keratinized stratified squamous epithelium b. Nonkeratinized stratified squamous epithelium c. Keratinized simple squamous epithelium d. Pseudostratified columnar epithelium e. Nonkeratinized simple squamous epithelium - A. Attached gingiva is composed of keratinized (orthokeratinized) stratified squamous epithelium. A cleft lip occurs when the maxillary process fails to fuse with which one of the following embryonic processes? a. Palatine process b. Globular process (medial nasal process) c. Lateral nasal process d. Mandibular process e. Opposing maxillary process - B. Cleft lip occurs when the maxillary process fails to fuse with the globular process. The maxillary process forms the sides of the lip, and the globular process (medial nasal process) forms the center or philtrum of the lip. A cleft lip can occur on one side (e.g., the right maxillary process fails to fuse with the globular process), or on both sides (e.g., the right and left maxillary processes fail to fuse with the globular process). Embryonically, the mandible is derived from the: a. Stomodeum b. First branchial arch c. Frontal process d. Second branchial arch