Normal and Abnormal Facial Growth Flashcards
how long does facial growth last?
until late teens to a small extent in adult hood
what 2 ways is bone laid down?
endochondral - within a cartilage
intramembranous - within a memebrane
how does bone remodel?
by laying down or resorption
how do bones connect to each other?
sutures (non movable)
except tmj (movable)
what structures make the face?
calvarium (skull)
cranial base
nasomaxillary complex
mandible
what type of ossification is calvarium?
intramembranous
how many fontanelles are there at birth?
6
when are all fontanelles closed by after birth?
18 months
why do fontanelles not close before birth?
allows compression of head at birth
where does bone formation and bone resorption take place?
bone formation - externally
bone resorption - internally
what type of ossification makes the cranial base?
endochondreal
what makes up the nasomaxillary complex?
maxilla, nasal septum and zygomatic bones
what type of ossification takes place to make the nasomaxillary complex?
intramembranous
what type of ossification takes place to form the mandible?
endochondreal
in females when is facial growth finished?
16 - 17 yrs
in males when is facial growth finished?
17-19 yrs
what stage in life can the mandible have late growth?
early 20s
why do teeth lie in a position of equilibrium?
due to forces being applied from lips, tongue, cheeks
when does the first tooth in the deciduous dentition erupt?
6 mths
when is the deciduous dentition usually complete?
age 3
when is root formation in deciduous dentition complete?
18 mths post eruption
when does calcification of the primary teeth happen?
in utero
when do deciduous teeth start to exfoliate?
6 yrs
when is root formation complete in the permanent dentition?
3 yrs after eruption
