(06) Digestive System I - Teeth

Question 1

(Teeth)

1-2. Teeth can be classifed in what two ways?

Answer 1

1. type of growth
2. period of function

Question 2

1-2. What are the two types when classified by type of grwoth?

Answer 2

1. brachydont
2. hypsodont

Question 3

(Brachydont (short tooth))

1. what defines them?
2. found in what?

Answer 3

1. finite growth period and limited period of eruption
2. man, carnivores, pig, and ruminant (incisors)

Question 4

(Hypsodont)

1. what defines them?
2. Some have a finite period of growth (all teeth of the horse, cheek teeth or ruminants, rodents, and lagomorphs)
3. Some are continuously erupting (boar and elephant tusks, rodent and lagomorph incisors)

Answer 4

1. continuously erupting (continuously emerging through gingiva)

Question 5

(Classified According to PEriod of function)

1. What are the first teeth to erupt? Subsequently the root is absorbed by what? replaced by what?
2. What teeth must last throughout adult life?

Answer 5

1. Deciduous (baby or milk); osteoclasts; adult dentition
2. permanent

Question 6

(Structure and Development of Brachydont Teeth)

1. What is the part of tooth distal to the neck?
2. The clincal crown is the part exposed through what?
3. The crown is composed of layers of what over what?

Answer 6

1. crown
2. gingiva (gum)
3. layers of enamel over dentin

Question 7

(Structure and Development of Brachydont Teeth)

(Gingiva)

1. anchored to enamel by what two things?
2. attachment is at the what?

Answer 7

1. basal lamina-like substances and hemidesmosomes
2. tooth of the neck

Question 8

(Structure and Development of Brachydont Teeth)

1. What is the constriction in the tooth just below the surface of the gingiva?

Answer 8

1. neck

Question 9

(Structure and Development of Brachydont Teeth)

1. The root is anchored in a what of the jaw?
2. The root is composed of the mineralized what covered by what?

Answer 9

1. bony alveolus
2. mineralized dentin covered by cementum

Question 10

(Structure and Development of Brachydont Teeth)

1. What is located in the center of the tooth?
2. Contains what?

Answer 10

1. the pulp cavity
2. nerves, vacular supply, fibroblasts, collagen fibers

Question 11

(Structure and Development of Brachydont Teeth)

1. What consists of perforating (collagen) fibers which are anchored in both the bony alveolus of the jaw and in the cementum of root?
2. Acts as a what and does what?

Answer 11

1. periodontal ligament

2. Acts as a shock absorber and holds tooth in place

Question 12

(Structure and Development of Brachydont Teeth)

1-3. What are the three minearlized tissues in teeth?

Answer 12

1. enamel
2. dentin
3. cementum

Question 13

(Three mineralized tissues in teeth)

(Enamel)

1. formed by what?
2. hardest or softest?
3. It is organized into enamel prisms and compsed of acellular organic matrix (not collagen) and hydroxyapatite
4. Does enamel form after eruption of the tooth?

Answer 13

1. ameloblasts

2. hardest part of tooth
3. no

Question 14

(Three minearlized tissues in teeth)

(Dentin)

1. produced by what?
2. harder than what?
3. composed of what and what?
4. Formed throughout life? produced in response to what?
5. Dentin layer is traversed by what that contain what extending to the enamel layer and nerves?

Answer 14

1. odontoblasts

2. bone
3. collagen and hypoxyapatite
4. yes, injury
5. dentinal canaliculi or tubules which contain odontoblast or dentinal processes

Question 15

(Three minearlized tissues in teeth)

(Cementum)

1. produced by what?
2. like what in structure and composition?
3. does it have osteons?
4. What are located in lacunae within the cementum?

Answer 15

1. cementoblasts
2. bone
3. no
4. cemetocytes

Question 16

(Development of Brachydont Teeth)

1. The what is an epithelial (ectodermal) ingrowth (a cup like structure which takes on shape of future tooth?
2. The inner most layer of cells; differentiates into what? produces what?
3. peripheral layer of cells = ?
4. What is comprised of cells of the enamel organ between inner and outer enamel epithelium?
5. What is the rim of the enamel organ that induces odontoblasts of the dental papilla to form detnine of the root?

Answer 16

1. enamel organ (epithelial tooth organ)
2. inner enamel epithelium; ameloblasts; enamel
3. outer enamel epithelium
4. stellate reticulum
5. epithelial root sheath

Question 17

he skipped right over this - but read it in the notes anyway

Question 18

(Strucutre and Development of the Hypsodont Tooth)

1. Does the hypsodont tooth body have a distinct neck or crown?
2. Entire tooth is covered by what?

Answer 18

1. no
2. cementum

Question 19

(Strucutre and Development of the Hypsodont Tooth)

1. What is confined to a short area with no enamel?

(Thus almost the entire tooth (except the root) is covered by layers of dentin, enamel and cementum (from inside to outside))

Answer 19

1. the root

Question 20

(Strucutre and Development of the Hypsodont Tooth)

1. What are ridges formed on the occusal surfaces by the uneven wear of enamel, dentin and cementum?
2. Which layer is the last to wear down?
3. The minearlized tissues of equine and bovine teeth wear away because of what?

Answer 20

1. enamel crests
2. enamel (forms an effective ridged grinding surface)
3. the high silica content of the diet

Question 21

(Development of the Hypsodont Teeth)

1. The enamel organ collapses before tooth eruption and thus cementum formation starts before or after eruption?
2. What covers the entire outer surface of tooth?
3. In continuously growing teeth, does enamel, dentin, and cementum formation continue for the life of the the tooth?

Answer 21

1. before
2. cementum
3. yes

Question 22

(Clinical Considereation)

(Periodontal Disease)

read this

(and the part from the notes - they appear to be different)