PEDO- M1

1. digestion and assimilation

2. stimulation of growth of jaw through mastication

3. development of speech

4. mantenance of space

functions of primary tooth:

• growth

• calcification

• eruption

• attrition

• resorption

stages of development

• initiation

• proliferation

• histordiffirentiation

• morphodifferentiation

• apposition

stages of growth:

ectodermal and mesodermal cells

teeth are derived from __

ectodermal cells

perform special functions enamel formation, odontoblastic stimulation, and determination of shape of crown and root

mesodermal cells

cells that persist throughout life

mesodermal cells

forms the dentin, pulpal tissue, cementum, periodontal membrane, alveolar bone

sixth week

first stage of growth is evident on __

proliferation of cells in the basal layer

tooth bud forms through __

sixth week of life

start of bud stage

tenth week of life

start of cap stage

bud stage

during this stage, outer enamel epithelium and inner enamel epithelium are formed

tenth week of like

when the enamel organ deepens and form a cap shaped appearance

outer enamel epithelium

corresponds to the covering

inner enamel epithelium

corresponds to the lining of the cap

stellate cells

the separation of OEE and IEE

stellate cells

anastomoses with similar cells and forms a mesh or reticulum (stellate reticulum)

stellate reticulum

serves as a cushin for the developing enamel forming cells

dental papilla

are formed after the proliferation and condensation of mesenchymal cells

dental papilla

forms the dental pulp and dentin

dental sac

forms after a chance in the cellular concentration in the mesenchymal tissue

dental sac

a denser and more fibrous tissue

dental papilla

forms the cementum, periodontal membrane, and alveolar bone

stratum intermedium

are formed after low squamous cells differentiate between the stellate reticulum and IEE

stratum intermedium

whose presence is necessary for enamel formation

inner enamel epithelium

functions as ameloblast and are capable of forming enamel

odontoblast

high columnar cells that are formed after the differentiation of the peripheral cells of the dental papilla

hertwig’s sheath

designs the contour of the root

hertwig’s sheath

extensions of the united enamel epithelium

stage of apposiion

when the ameloblast move peripherally from their base and lay down in their travel enamel matrix which is only from 25 to 30 percent calcified

tome’s fibers

protoplasmic extensions that are left after the odontoblasts move inwardly away fom the dentino enamel junction

predentin

formed by odontoblast and korff’s cells

predentin

where calcification takes place, created by the deposition of apatitie crystals in the collagenous matrix

maturation of the enamel

begins with the deposition of apatite crystals within the existing enamel matrix

kraus

observed that the central incisors developed from a single lobe and not from three centers as formerly believed

root resorption

begins 1 year after tooth eruption

cuspids

reach the occlusion more slowly than the others

first molars

reach the occlusion in the least time

4-6 months in the utero

beginning of calcification of primary teeth

6-24 months

eruption of primary teeth

6 and 11 years of age

the time when the teeth shed

6 months later than the exfoliation of primary teeth

the eruption age of succedaneous teeth

berth and 3 years of age

calcification of the permanent teeth begins __

3 years previous to eruotion

enamel is completely formed about __

3 years after eruption

roots are completely formed about __

primary teeth

smaller in all dimensions

primary teeth

are wider mesiodistantally than cervico occlusally

cup shape

shape of anterior primary teeth

squat appearance

shape of primary molars

permanent teeth

primary teeth

have a more pronounced cervical ridge

permanent teeth

have less pronounced cervical ridge

primary teeth

have flatter buccal and lingual surfaces of molars

permanent teeth

have a more bulky buccal and lingual surface of molar

primary teeth

have a constricted neck

primary teeth

enamel rods at the cervix slope occlusally

permanent teeth

enamel rods at the cervix slope gingivally

primary teeth

have a less tooth structure protecting the pulp

permanent teeth

have more tooth structure protecting the pulp

primary teeth

have higher pulp horms and larger pulp chamber

permanent teeth

have lower pulp horns and smaller pulp chambers

primary teeth

gave greater thickness of dentin over the pulpal wall

primary teeth

roots are longer and more slender in comparison with crown size

permanent teeth

roots are smaller and not slender in comparison with crown size

primary teeth

roots flare out nearer the cervix

max primary 1st molar

resembles the tooth that will replace it than any other primary molar

max primary 1st molar

presents 4 well defined surfaces and the root is formed of three well defined diverging prongs

lingual root

the longest root of max 1st molar that diverges in a lingual direction

distobuccal root

shortest root of maxi 1st molar

mesiobuccal pulpal horn

the largest pulpal horn of max 1st molar

mesiolingual pulpal horn

the second largest pulpal horn of max primary 1st molar that is quite angular and sharp but not as high as the mesiobuccal horn

disrobuccal pulpal horn

the smallest pulpal horn of max primary 1st molar that is sharp and occupies the distobuccal angle

obtuse

mesiolingual angle of

max primary 1st molar

acute

distobuccal and mesiobuccal angle of

max primary 1st molar

mand 1st primary molar

is morphologically unque among the primary molars

mand 1st primary molar

its chief characteristic is its over developed mesial marginal ridge

mand 1st primary molar

has an overly developed mesial marginal ridge that somewhat resembles a fifth cusp

mand 1st primary molar

has a shape of a rhomboid

mesiobuccal horn

larges pulpal horn of

mand 1st primary molar

distobuccal pulpal horn

is second largest pulpal horn of mand 1st primary molar but lacks the height of the mesial horns

mesiolingual pulpal horn

horn of mand 1st primary molar that lies mesial to the corresponding cusp

distolingual pulpal horn

the smallest pulpal horn of mand 1st primary molar that is more pointed than the buccal horns

max 2nd primary molar

its crown is smaller and more angular, an in converging more towards the occlusal

max 2nd primary molar

has a more pronounced cervical ridge on the buccal surface

max 2nd primary molar

is intermediate in size between the smaller fisrt primary molar and the larger first permanent molar

max primary incisors

are shorter incisocervically than mesiodistally

lingual fossa

the depression between the marginal ridge and the cingulum of incisors

max primary incisors

roots are conical in shape and fairly regular in form, ending in a well rounded apex

mand primary incisors

are narrow and the smallest incisors in the mouth

central incisor

roots are flattened on its mesial and distal aspects and tapers towards the apex

lateral incisor

roots are longer and also tapers towards the apex

mandibular canine

root tapers to a pointed apex

maxillary canine

root is tapering