Lecture 5- dentinogenesis and dentin defects

Question 1

dentin is 50%… and 30%….

Answer 1

mineral

organic matrix

Question 2

incremental lines of dentin are called

Answer 2

Owen or von Ebner

Question 3

dentin sensitivity is mediated by …..

Answer 3

odontoblast processes

Question 4

90% of the non-collagenous protein in dentin is

Answer 4

dentin sialophosphoprotein

Question 5

more terminal branching of dentinal tubules occurs in … compared to …

Answer 5

root dentin

coronal dentin

Question 6

coroal dentin tubules have ….

Answer 6

an S-shaped curvature (its more straight in the root)

Question 7

dentin tubules are…. in diameter

Answer 7

1-3 micrometers

Question 8

more dentin tubules are in the … relative to the…

Answer 8

crown

root

Question 9

more dentin tubules are near … than the…

Answer 9

pulp

surface

Question 10

…. is the fibrillar organic matrix before its calcification

Answer 10

predentin

Question 11

… dentin is made during tooth formation

Answer 11

primary

Question 12

primary dentin is also called… and its outer layer is …

Answer 12

circumpulpal dentin

mantle dentin

Question 13

…. dentin forms when tooth is fulyl mature in mouth

Answer 13

secondary

Question 14

junction between primary and secondary denti is characterized by a change in

Answer 14

direction of dentin tubules

Question 15

… dentin formation is a local reaction to attrition, caries, or dental restoration

Answer 15

tertiary

Question 16

the quality of tertiary dentin depends on …

Answer 16

intensity and duration of the stimulus

Question 17

tubules of tertiary dentin can be…

Answer 17

continuous, sparse, iregular or absent

Question 18

tertiary dentin can be…. which is formed by preexisting odontoblasts or…. which is formed by newly differentiated odontoblasts

Answer 18

reactionary dentin

reparative dentin

Question 19

when cells that form tertiary dentin are included in the hard tissue, its called…

Answer 19

osteodentin

Question 20

…. dentin is dentin that has become translucent due to calcification of the dentinal tubules as a result or injury or normal aging. also called….
this is due to injury or aging

Answer 20

sclerotic

transparent

Question 21

2 patterns of mineralization: … occurs at high rates and is best seen in mantle layer, …. is slower and uniform

Answer 21

globular

linear

Question 22

Within the primary dentin, there are localized areas of hypomineralized dentin, often just below… whenre globular zones of mineral fail to fuse into a homogenous mass, this is called…

Answer 22

mantle dentin

interglobular dentin

Question 23

… is a mineralization defect (failure of calcospherite fusion). dentinal tubules pass through this but no peritubular dentin is present in these arease

Answer 23

interglobular dentin

Question 24

… surrounds the dentin tubules and is lower in collagen, higher in dentin sialophosphoprotein (DSPP) and more mineralized than intertubular dentin

Answer 24

peritubular dentin

Question 25

radiographs of dentinogenesis imperfecta shows…

Answer 25

bulbous crowns
pupal obliteration
short roots
tooth impactions

Question 26

DSP (dentin sialoprotein) is a …

Answer 26

proteoglycan

Question 27

DPP (dentin phosphoprotein is the most…. protein

Answer 27

acidic

Question 28

DPP has highly repetitive … and has hundreds of… and has an isoelectric point of …

Answer 28

sequence DSS
phosphoserines
1.0

Question 29

DSPP is expressed in…

Answer 29

preameloblasts
preodontoblasts
odontoblasts