Primary Dentition Flashcards
How many primary teeth are in total?
How are they lettered or numbered?
20 (10 in each arch),
LETTERED
Teeth start to form at _________ in utero
4-6 weeks in utero
Calcification: begins approx ______________ in utero:
4-5 months in utero
At Birth, are teeth visible? How about the tooth buds?
At Birth, no teeth are visible; however, tooth buds may be noted on radiographs*
Date of eruption for max and mand central incisrors:
6-10 months
Eruption:
Max later incisor
8-13 months
Eruption:
mand lateral incisors
10-16 months
max and mand first morlars (first year molars) erupption date
18-14 months
maxillary canines eruption
16-22 months
mandibular canine eruption
17-23 months
max and mandibular second molars (second year molars)
23-33 months
By Five (5) years of age, there is separation of teeth, usually the **anterior teeth **due to the:
growth of the Maxilla and to accommodate the larger Permanent teeth.
By Six (6) years of age, the ________________ erupt, with this occurrence we see the beginning of the Mixed Dentition Stage, usually lasting until : ___________________
By Six (6) years of age, the Permanent First Molars erupt, with this occurrence we see the beginning of the Mixed Dentition Stage, usually lasting until Twelve (12) years of age.
Permanent Anterior Teeth Erupt _______ to Primary Anterior Teeth
LINGUAL
Permanent Posterior Teeth erupt_____________ are of Primary teeth.
Erupt apical (beneath), in the furcation
Primary teeth (roots) resorb; their roots are completed approximately ________________ years after eruption, then they resorb.
1 - 2 years
Do primary incisors have mamelons?
How about permanent incisors?
Primary Incisors have NO mamelons; Permanent Incisors DO!
Do primary teeth have premolars?
no
- Primary Molars are replaced by
the Permanent Premolar teeth.
Primary teeth are (smaller/larger?) and (whiter/darker?) that permenant teeth?
Primary teeth are smaller and whiter (less calcified than permanent teeth)
Are the crowns of primary teeth narrower or wider M-D compared to their crown lengths?
Crowns of Primary Teeth are WIDER M-D compared to their crown lengths.
Primary teeth crowns are more “squatty” (disproportionally shorter and thicker)
Roots of Primary Molars are _____________________beyond the crown to accommodate the Permanent Premolar Teeth.
longer, slender, and flare
Primary teeth have prominent _________ ridges or bulges on anterior teeth labially and lingually, producing a construction at the cervix of the tooth.
cervical ridges!!
are primary molars narrow or wider at the cervix?
Primary Molars are narrow at the cervix (constricted at the cervix).
Prominent ________________________ cervical ridges on the maxillary and mandibular first primary molars.
buccal cervical ridges
Primary teeth have a (narrow/wider) occlusal table in part due to:
narrow occlusal table due to a flat slanted surface above the cervical bulge.
Occlusion:
* ______________________ and the ______________________ contact only one tooth in the opposing arch.
* Relations change with growth, no ________________ occlusal relationships.
* Spaces or diastemas develop particularly in the ____________________ region.
* Primary teeth wear on the __________&__________ (the primary teeth are less well calcified than the
permanent teeth).
* The first permanent molar stabilizes the occlusion at _________________ of age.
Occlusion:
* **Mandibular centrals and the maxillary second primary molars **contact only one tooth in the opposing arch.
* Relations change with growth, no static occlusal relationships.
* Spaces or diastemas develop particularly in the anterior region.
* Primary teeth wear on the incisal and occlusal (the primary teeth are less well calcified than the
permanent teeth).
* The first permanent molar stabilizes the occlusion at six years of age.
- Primary teeth may have **Primate spaces **(A & B as pictured above).
These spaces originally were to accommodate the ______________ or ________________
- maxillary:
- mandibular:
long canines or primates
Maxillary: Mesial to the Canine Mandibular:Distal to the Canine
the difference between the combined mesiodistal widths of the deciduous cuspids and molars and their successors is called:
**Leeway Space
*Specifically, the size differential between the Primary Canine, Primary First Molar and Primary Second Molar, and the Permanent Canine, First Molar, and Second Molar. Usually, the sum of the Primary Tooth Widths is greater than that of their permanent successors. *
which arch has more leeway space?
mandibular arch
There is a greater mesiodistal width of the Mandibular Primary Molars by ________________, allowing more of a mesial shift of the permanent molars.
2.1mm
Primary teeth characteristics image
Diagram of Enamel Rods: primary vs permenant teeth
- Primary teeth: Slope Occlusally from DEJ
- Permanent Teeth: Slope Cervically from DEJ
Primary Maxillary Central Incisor
- Greater ________________width than crown height
- ____________________ has thick appearance
- Single, Conical Root, ________________ Root Canal
- Pulp has _____________ horns
- Greater M-D width than crown height
- Proximal has thick appearance
- Single, Conical Root, One Root Canal
- Pulp has 2 or 3 pulp horns
Primary Maxillary Lateral Incisor
- (Narrower/wider?) M-D width than central incisor
- which length is greater, Cervicoincisal or mesiodistal width?
- Distoincisal angle much more ____________ than central incisor
- Pulp cavity has cervical constriction with ____________root canal and _________ pulp horns (M & D)
- Narrower M-D width than central incisor
- Cervicoincisal length greater than mesiodistal width
- Distoincisal angle much more rounded than central incisor
- Pulp cavity has cervical constriction with 1 root canal and 2 pulp horns (M & D)
Primary Maxillary Canine
- ____________________ in all aspects of the anterior teeth.
- Widest primary tooth ____________________ and wider M-D than _________________________
- More constriction at the ____________________surfaces are more (convex /concave?) than incisors
- Mesial and Distal contacts at the ________ level
- Longer ____________cusp slope
* how mnay roots, root canal and pulp horns?
- Bulkier in all aspects of the anterior teeth.
- Widest primary tooth Labiolingually and wider M-D than** Primary Maxillary Central Incisor.**
- More constriction at the **cervical and mesial and distal surfaces **are more convex than incisors
- Mesial and Distal contacts at the same level
- Longer mesial cusp slope
* Single root, single root canal, no pulp horns
