Ortho Comp Flashcards
risks of ortho
decal
gingival recession
root resorption
relapse
how long ortho on for
18-24 months
how to prevent decal
good oh
f-
good diet
LAT CEPH figures
ANB: 2-4 degrees
LAFH: 55%
How to assess vertical skeletal pattern
VERTICAL: FMPA: FP: porion to orbitale MP: gonion to menton ave: meet at occiput low meet posteriorly high meet anteriorly LAFH: glabella- subnasale- menton
50-50 clinically
55% latceph
LAT CEPH figures
ANB: 2-4 degrees
LAFH: 55%
Ui/Mxp = 109 degrees
Li/Mnp = 93 degrees
average naso-labial angle
90-110 degrees
what would count as poor porgnosis teeth
grossly carious
v heavily restored
significant trauma
significant hypoplasia
mild mod severe crowding figures
mild: 2-4mm
mod: 4-8mm
severe: >8mm
space available/space required
or overlap technique
class I incisor classification
lower incisor occlude to cingulum plateau of upper incisors
class II div 1 incisor classification
lower incisor edges occlude posteriorly to cingulum plateau of upper incisors
+ upper incisors proclined or average
+ increased OJ
class II div 2 incisor classification
lower incisor edges occlude posteriorly to cingulum plateau of upper incisors
+ upper incisors retroclined
+ reduced but also increased OJ
class III incisor classification
lower incisor edges occlude anteriorly to cingulum plateau of upper incisors
+reduced or reversed OJ
average overbite definiton
upper incisors overlap incisal third of crowns of lower incisors
define Overjet
horizontal distance between labial surface of the tips of the upper incisors and the surface of the lower incisors
class I molar / canine relationship - angles classification
mesiobuccal cusp of the upper first molar occludes with the mesiobuccal groove of the lower first molar
upper canine occludes in embrasure between lower canine and lower first molar
class II : upper moves forward class III : upper moves backwards
grading of IOTN
1&2: little or no need for tx
3: boderline
4&5: need tx
mocdoo
M missing: congenital/ ectopic/ impacted O overjet C crossbite D displacement of contact points O overbite or AOB
when using study models to assess IOTN assume…
lips incompetent
masticatory or speech problems
if crossbite displacement on closure of more than 2mm
most common missing teeth in hypodontia
L5s and U2s
tx goal- andrews six keys
class 1 molars
class 1 incisors
tight appoximal contacts
flat occlusal plane/ slight curve of spee
long axis of teeth has slight mesial inclination except lower incisors
crowns of canines back to molars have lingual inclination
ortho tx options
1 accept 2 growth mod 3 ura 4 fixed appliance (camouflage) 5 orthognathic
pros and cons fixed appliances
\:) precise control over individual teeth multiple tooth movement at once reduced tongue space impingement cannot be moved by patients \:( OH difficult expensive
pros and cons removable appliances
\:) inexpensive simple to adjust, less chairside time palatal coverage increases anchorage removable- easier to clean \:( compliance issue as removable only tilting possible bulky - speech impaired, increased saliva flow
root resorption incidence
what increases risk of root resorption
100% incidence, happens to all patients undergoing ortho
about 1-2mm root resorption
intrusion, short blunt roots, previous trauma, pre-existing root resorption, nail biting
features with high relapse potential
rotations diastemas aob instanding u2s lower incisor crowding
pros and cons removable retainers
\:) impoved oh as removable patient control \:( loss compliance
pros and cons fixed retainers
\:) no question of compliance long life \:( prone to calculus and plaque build up can break unnoticed need excellent OH require long term maintenance
difference in tx for adults and children
lack of growth perio disease missing / heavily restored teeth physiological factors adult motivation
6 factors in fault competency
- describe FORM of ortho therapy, explain general usage
- inspect appliance, ensure components stable and not fractured, identify any FAULT or emergency
- demonstrate importance of ACCOUNTING for all components and decide appr. action
- describe options available to TREAT problem ensuring pt safety paramount and ideally without compromising current tx
- explain procedures and implements to treat problem
- ensure appropriate cases are REFERRED back to ortho
systematic approach to cases
Ask how happened Account for missing components Deal with problem Account for retention Refer to orthodontist y/n
trauma with fixed appliance case
trauma stamp
wax on remainng brackets to avoid future trauma
how to make arrowhead safe
squeeze close
