Primary Dentition Hightlights and Tooth Coding Systems

what are differences between primary and permanent teeth?

-onionshaped, converging towards occlusal

-enamel rods in cervical areas directed toward the occlusal

-thinner enamel and dentin

-broad and flat contacts

-lighter (B2-A1)

Crown Anatomy on 2nd molars are almost identical to those of __.

1st perm molars

Keep in mind that permanent molars erupt __ the primary teeth—they do not substitute any primary teeth.

behind

primary 2nd molar roots are more narrow/ spread

spread- have premolars erupting under

what are the cusp from largest to smallest on K?

MB> DB >ML > DL > D

T/F: For K, Prominent buccal cervical ridge(more pronounced than in permanent teeth

T

T/F: Primary cusps are pointier and taller

F

Do perm or primary teeth have longer roots in comparison to their crown?

The roots of primary teeth are narrower and longer compared to their crown length. In contrast, permanent teeth have shorter and thicker roots.

Is the furcation of primary molars more occlusal or apical compared to furcation of perm molars?

primary molars' furcations are more closer to the crowns

Which K root is widest and broader?

mesial root is broader BL; 2 canals

which primary molar root has 2 canals?

K; perm 2nd molars

is the root trunk short or long?

short

Primary teeth have a sm or lg pulp chamber?

lg

pulp horns of prim teeth tall or short?

tall

describe the FDI/ International tooth numbering system

describe the palmer notation method for numbering teeth. What specialties use this?

-orthodontist, suppliers for crowns and bands

teeth present at birth are called..

natal teeth

rigafage friction

teeth erupting w/in 30 days of birth are called?

neonatal teeth

extra tooth at midline is called?

mesiodens

how do you number a supernumerary tooth?

when the developing tooth moves inside thealveolar bone but cannot yet be seen clinically is called...

preeemergent eruption

The moment when a cusp or an incisal edge of a tooth first penetrates the gingiva

emergence

emergence occurs when __% of the final root length is established

75%

eruption of teeth follows _ rhythm

day-night (circadian)

when does most eruption occur?

Eruption occurs mainly during early hours of sleep, although some intrusion can happen during the day, particularly after meals

Tooth eruption and secretion of __ and __ hormones have a similar circadian pattern.

growth and thyroid hormones

Continuous movement until it reaches the occlusal level

post emerging eruption

On average a molar tooth erupts about __ mm after having reached the occlusal contact

10 mm