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Periodontium
Oral Anatomy - Module 11
| Question | Answer |
|---|---|
| What type of matrix does dentin develop from? | Collagen |
| What is the most common component of dentin? | Hydroxyapatite |
| What is the DEJ formed by? | Basement membrane disintegration |
| What type of dentin is formed at the pulpal periphery after tooth formation is complete? | Secondary |
| What dentin creates the walls of the dentin tubules? | Peritubular |
| Where does pulp originate from? | Ectomesenchyme |
| What is the most superficial layer of pulp? | Odontoblastic layer |
| What kind of pulpitis may follow the restoration of a tooth? | Pulpal hyperemia |
| Where does enamel originate from? | Ectoderm |
| What type of matrix does enamel develop from? | Protein |
| An odontoblastic process which is mineralized in enamel is a(n) what? | Enamel spindle |
| What can cause a generalized deep intrinsic staining of teeth? | Tetracycline |
| What is the most common CEJ pattern? | Overlapping of cementum and enamel (OMG) |
| What is the most common fiber type found in the periodontal ligament? | Collagen |
| Hemidesmosomal junctions occur between enamel and what? | Junctional epithelium |
| What is the function of dentin? | Shock absorber |
| Where is secondary dentin located and when does it form? | Pulp periphery, after the root is completed |
| Describe the shape of enamel rods. | Rods or prism |
| What is the organic component of enamel? | 96% |
| What are the 4 functions of pulp? | Support, sensory, nutritional, protective |
| What are the 5 components of the periodontium? | Cementum, alveolar bone, PDL, tooth, and gingiva |
| What are the functions of the PDL? | Supportive, sensory, nutritional, can be formative and resorptive |
| What are the types of alveolar bone? | Proper (lines the tooth socket) and supporting (cortical and trabecular bone) |
| Location of alveolar crest fibers? | Cervical cementum |
| Location of horizontal fibers? | Alveolus proper horizontal to cementum |
| Location of oblique fibers? | Apical 2/3 of root |
| Location of apical fibers? | Apex |
| Location of interradicular fibers? | Between roots |
| Location of transseptal fibers? | Tooth to tooth |
| List the 6 PDL fibers. | Alveolar crest, horizontal, oblique, apical, interradicular, and transseptal |
| Location of circular ligament? | Around tooth |
| Location of dentogingival ligament? | Dentin to gingiva |
| Location of alveologingival ligament? | Alveolar bone to gingiva |
| Location of dentoperiosteal ligament? | Dentin to alveolar bone (Periosteum) |
| List the 4 Gingival fibers. | Circular ligament, dentogingival ligament, alveologingival ligament, and dentoperiosteal ligament. |
| Hard and soft tissue which supports the tooth in relation to the alveolar bone is what? | Periodontium |
| What are the parts of the periodontium? | Alveolar bone, PDL, cementum, tooth, and gingiva |
| What is the % of mineralization of dentin? | 70% |
| Types of dentin based on formation? | Primary, secondary, and tertiary |
| Why does tertiary dentin form? | Response to noxious stimuli |
| Where is radicular pulp? | In the root |
| What are the pulp zones? | Odontoblastic - nearest to dentin Cell-free zone - nerves and capillaries Cell-rich zone - rich in vasculature Pulpal core - deepest; extensive vascular supply |
| What is the % of mineralization of enamel? | 96% |
| Is enamel vascular or avascular? | Avascular |
| What are the striae of retzius? | Incremental growth lines |
| In healthy patients, is cementum visible? | No |
| What is the function of cementum? | To anchor the PDL |
| What is the % of mineralization of cementum? | 65% |
| Is cementum vascular or avascular? | Avascular |
| What should healthy cementum look and feel like? | Pale, dull yellow with grainy feel |
| What is the origin of cementum? | Dental sac, Mesoderm |
| What are the undifferentiated cells in the dental sac that give rise to cementum? | Cementoblasts |
| Cementum begins forming on the root after the disintegration of what? | Hartwig's epithelial root sheath |
| What are the PDL fiber groups formed by? | Collagen |
| What are the different PDL fiber groups? | Alveolar crest, horizontal, oblique, apical, interradicular, transseptal |
| What is the function of the PDL? | Provides attachment for the tooth to jaw, shock absorber |
| What are cementoblasts called once they are trapped in cementum? | Cementocytes |
| What is the most common CEJ relationships and what is the percentages? | Overlap - 60% Meet - 30% Gap - 10% |
| What are the 3 major characteristics of alveolar bone? | Easily remodeled by pressure, vasculare, 60% mineralized |
| What are the 2 types of alveolar bone? | Proper and supporting |
| What type of alveolar bone do you see in edentulous patients? | Supporting |
| What type of bone lines the tooth socket? | Proper |
| What are the functions of the pulp? | Support/Maintenance of coronal dentin, sensory, nutritional, and protective |
Created by:
jridder25