Flashcards
OCB02-1019- Structure of cementum and alveolar bones
Cards in this deck (31)
- 1Label the Alveolar BoneA: Body
B: Ramus
C: Incisive Fossa
D: Mental Foramen
E: Angle
F: External oblique line
G: Coronoid process
H: Condyle
I: Mental Protuberance - 2What are the functions of alveolar bone? (4)1. Muscle attachment
2. Bone marrow
3. Reservoir for ions (Ca2+)
4. Plasticity+remodelling - 3What does the alveolar depend on for development? Maintenance? Retain bone mass?1. Tooth eruption
2. Tooth retention
3. Functional stimuli - 4When does the alveolar bone develop?Second month of fetal life with root formation/eruption of teeth
- 5What are the 3 layers inside alveolar bone, from outside to inside?1. Outer cortical plates (cortical)
2. Central spongiosa (spongy)
3. Bundle bone lining alveolus (cortical) - 6What attaches bundle bone to the PDL?Collagen fibres
- 7Where is the outer cortical plate thicker?Mandible>maxilla
Premolar/molar regions - 8What are Sharpey's Fibers? What orientation are they to bundle bone?Fibers of the PDL that embed in bone/cementum
Perpendicular to bundle bone (vs. parallel) - 9What is the lamina dura?Thick line on radiograph due to lack of trabeculations
- 10What is the cribiform plate in the alveolar bone?The preforated structure that allows for blood vessels/nerves
- 11What does the interradicular septum separate?Roots on multirooted teeth
- 12What does the interdental septum separate?Two adjacent teeth
- 13What is the alveolar bone innervated by?The trigeminal nerve
- 14What does the trigeminal nerve contain? (4)1. Mesencephalic sensory neurons of trigeminal nerve
2. Motor nucleus
3. Sensory nucleus
4. Spinal sensory trigeminal nucleus - 15What does the trigeminal ganglion split into? (3)Ophthalmic branch
Maxillary branch
Mandibular branch - 16What in the alveolar bone allows nerve/blood to pass through?Canals and foramens
- 17What is the arrangement of the trabeculae in the maxilla?Irregular (Type 2)
More trabecular
More porous - 18What is the arrangement of the trabeculae in the mandible?Regular/horizontal (Type 1)
Less trabecular
Less porous - 19What is the relationship between tooth loss and bone?Leads to bone loss (eg. shortened jaw)
- 20What is the resting line?Where osteoblasts stop making bone
- 21What is the reversal line?Where osteoclasts start reabsorbing bone
- 22What is cementum?Bone like tissue covering ROOTS of teeth
Thickest at apex
Unvascularised - 23What are the functions of cementum? (4)1. Joins enamel at cervix of teeth
2. Anchor teeth to bony walls of tooth socket
3. Anchor gingival/periodontal fibres
4. Protects dentine - 24What forms cementum? Where do they originate?Cementoblasts
3 models (pulp cells to odontoblasts to cementoblasts OR HERS-->Epithelial mesenchyme transformations OR dental follicle cells) - 25What is the composition of cementum?65% inorganic hydroxyapatite
23% organic (type 1 collagen, proteoglycans, glycoproteins)
12% H20 - 26What is the ranking of inorganic material from high to low of bone, cementum, dentine and enamel?Enamel (90%)>Dentine(70%)>Cementum(65%)>Bone (60%)
- 27What are the four types of cementum?1. Acellular, afibrillar cementum:
-small islands on enamel
2. Acellular, extrinsic fibre cementum
3. Cellular intrinsic fiber cementum
4. Cellular mixed fiber cementum
- 28What are the differences between cellular and acellular cementum in terms of cementocytes, deposition rate, incremental lines, and precementum layer?1. Acellular has no cementocytes
2. Acellular has slow deposition
3. Acellular has close incremental lines
4. Acellular has THIN precementum layer - 29What are the differences between extrinsic fibrillar and intrinsic fibrillar in terms of orientation to cementum, origin, and function?1. Extrinsic comes from PDL and is perpendicular to cementum (eg. Sharpey's) while intrinsic is parallel
2. Intrinsic is produced by cementoblasts
3. Extrinsic anchors teeth, intrinsic found near repair - 30Does the cementum remodel?No, unlike bone
- 31What is hypercementosis?Too much cementum creates bulge in tooth roots
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- Description
- differentiation of cementoblasts Define cementoblast/cementocyte. different types of cementum form. constituents of cementum and compare with bone. acellular vs cellular cementum. Describe the CEJ and the CDJ and explain the clinical significance of these regions. five cell types found in bone, structure and function. Illustrate the tooth/alveolar process relationships around the upper & lower arch. Define and explain the significance of resting and reversal lines.
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- Evian Chai
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