NBDHE Darby and Walsh 9th Edition Comprehensive Review Questions and verified Answers. 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 Correct Answer -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 Correct Answer -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 percept ion. 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. Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 Correct Answer -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 e. Third branchial arch Correct Answer -B. The first branchial arch gives rise to a large portion of the face and the intraoral structures. The mandible is derived from the first branchial arch. The anterior portion, or body, of the tongue develops from the: a. Second branchial arch b. Maxillary process c. Mandibular process d. Globular process (medial nasal process) e. Rathke's pouch Correct Answer -C. The mandibular process gives rise to the body of the tongue. Maxillary processes arise from the superolateral border of the first branchial arch. Once this occurs, the rest of the first branchial arch is referred to as the mandibular process. From the mandibular process (first branchial arch), two lateral swellings and one medial swelling (tuberculum impar) merge to form the body of the tongue. Which of the following orofacial structures is located in the midline of the face or neck? a. Philtrum b. Submandibular salivary gland c. Naris and ala d. Parotid salivary gland Correct Answer -A. The nasal septum is a vertical groove on the midline of the upper lip Continuous replacement of cells is characteristic of which type of epithelium? a. Simple squamous b. Stratified squamous c. Pseudo -stratified columnar d. Stratified transitional Correct Answer -B. Continuous replace of cells is a characteristic of stratified squamous epithelium. The cells of the basal layer constantly under mitosis, and the surface cells slough off as new cells move to the surface. When a cleft of the alveolar process is present, it occurs between the a. First and second premolars b. Central incisors c. Lateral incisor and canine d. Canine and first premolar Correct Answer -C. A cleft of the alveolar ridge results from the lack of fusion of the premaxilla, which forms the anterior portion of the palate and gives rise to the maxillary incisors, and of the lateral palatine proces ses (palatal shelves), which give rise to the posterior two thirds of the hard palate and contain the maxillary canines and posterior teeth. The lines of fusion, therefore, fall between the laterals and the canine teeth. The overlapping period between the primary and permanent dentition is considered the period of: a. Primary
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