final primary teeth Flashcards
primary teeth have bulges in?
cervical third of labial and lingual surfaces; lingual bulge is seen as large cingulum that occupies 1/3 of cervicoincisal crown length AND labial bulge is seen as a prominent convex cervical ridge
roots in proportion to crown length on primary teeth?
roots are long and narrow MD than on permanent teeth
roots on primary Max and mand anterior teeth bend ________ in apical third?
10 degrees labially in apical third
*less so in mand canine
roots primary max incisors bend lingually in? Mand?
cervical third to half
*Mand incisors are straighter in their cervical third
what is VERY SPECIAL about primary maxillary central incisors?
primary maxillary central incisors are the ONLY type of primary or permanent incisors where the crown is WIDER MD than incisocervically
compared to permanent teeth, primary incisor crowns are ______ relative to their root length?
shorter
dimensions of primary canines?
Max= about as long MD as incisogingivally mand= longer incisocervically and narrower MD
**primary max canines and permanent mandibular 1st premolars are UNIQUE how?
mesial proximal contacts more cervical than distal
*all other primary and permanent teeth have the distal contact more cervical
**primary mandibular canines have their distal cusp ridge _____ than their mesial cusp ridge? Same as what other teeth?
distal cusp ridge =longer
* permanent canines and premolars EXCEPT Max 1st premolars
**primary maxillary canines have their mesial cusp ridge _____ than their distal cusp ridge? Same as what other teeth?
mesial cusp ridge =longer
** Max 1st premolars
primary molar crowns are wider?
MD and shoerter cervico-occlusally (same as permanent molars)
are primary 1st or 2nd molars smaller?
1st
primary molar crowns have a narrow chewing surface (occlusal table) buccolingually compared to?
the entire tooth width buccolingually
buccal cusps are not?
as sharp; they meet at wide obtuse angles
buccal cervical ridges are prominent, especially mesial or distally?
mesially; so the cervical lines curve more apically in mesial half of buccal surface
primary root furcations?
are nearer to the crown with little or no root trunk compared to permanent molars
describe general primary roots characteristics?
thin, slender, widely spread
***primary maxillary second molars RESEMBLE?
different how?
permanent maxillary first molars
- occlusal veiw mesial outline tapers toward lingual
- primary mesiobuccal and mesiolingual cusp are about equal in size BUT mesiolingual cusp is larger than mesiobuccal for pemanent teeth
primary mandibular second molars RESEMBLE? different how?
permanent mandibular first molars
*the 3 buccal cusps are nearly equal in size (whereas for permanent teeth, the distal cusp is usually smaller)
what are the 4 cusps to primary maxiallary first molars?
4 cusps
1) mesibuccal is widest and longest
2) mesiolingual cusp is smaller but sharper
3) distobuccal cusp is small
4) disolingual is inconspicuous and sometimes absent
buccal groove on primary max 1st molar?
is located distal to center and divides the large mesiobuccal cusp fromthe indistinct distobuccal cusp
both the max premolar and primary max 1st molar are wier?
FL than MD
what are the 3 fossa on primary max 1st molars?
1) large mesial triangular fossa
2) medium central fossa
3) minute distal fossa
the grooves on primary max 1st molar form?
an H pattern (somewhat similar to max premolar)
what tooth does the primary mandibular first molar resemble?
NONE!
the primary maxillary first molar somewhat resembles?
permanent maxillary premolar
the primary mandibular first molar mesial marginal ridge is??
overdeveloped; almost resembles a cusp
the primary mandibular first molar occlusal table is wider? similar to?
MD than BL (like 2nd mandibular molars)
what primary tooth has an acute and prominent mesiobuccal angle of the occlusal table?
primary mandibular first molar= the mesial surface outline converges to the lingual with an acute and prominent mesiobuccal angle of the occlusal table
what cusp is largest on primary mandibular first molar?
the mesiobuccal cusp is largest and longest; almost covers 2/3 of buccal surface but not as wide buccolingually
what runs between the mesiobuccal and mesiolingual cusp on primary mandibular first molar?
a pronounced transverse ridge
the occlusal table on primary mandibular first molar is larger?
distal to the transverse ridge with a larger distal fossa and a smaller mesial traiangular fossa
*no central fossa
