Ortho Assessment Flashcards
What are the 3 methods to measure skeletal bases
AP
Vertical
Tranverse
How do we assess the skeletal pattern
AP
2 fingers
Class I - maxilla 2-3mm in front of mandible
Class II - maxilla >2-3mm in front of mandible
Class III - mandible in front of maxilla
Vertical
FMPA
Increased if lines meet before back of head
Decreased if lines don’t meet at back of head
Transverse
Asymmetry
Soft tissue assessment (4)
Smile line
Nasolabial angle
Lip trap
What do we assess I/O
Teeth quality/quantity/caries
Incisor relationship - proclined/retroclined
Canine relationship
Molar relationship
Xbites
Crowding
<4
4-8
>8
Centrelines
OB/OJ
Define incisor class I
Lower incisors occlude with cingulum plateau of uppers
Define incisor class II
Lower incisors lie posterior o cingulum plateau of uppers
Define incisor class II div I
Lower incisors lie posterior to cingulum plateau of uppers
Uppers proclined
Increased OJ
Define incisor class II Div II
Lower incisors lie posterior to cingulum plateau of uppers
Uppers retroclined
OJ inc or dec
Define incisor class III
Lower incisors lie anterior to cingulum plateau of uppers
OJ reduced or reversed
Define canine class I
Upper canine lies posterior to lower canine
Define canine class II
Upper canine lies anterior to lower canine
Define canine class III
Upper canine v posterior to lower
Define molar class I
MB cusp of U6 lies in buccal groove of L6
Define molar class II
MB cusp of U6 lies anterior to buccal groove of L6
Define molar class III
MB cusp of U6 lies posterior to buccal groove of L6
Lists risks associated with ortho tx
- Relapse
- Decalcification
- Resorption
- Recession
- Gingivitis
- Enamel wear
- Loss of vitality
Patient friendly description of relapse
When teeth go back to the same place after tx / squint
Can be inevitable
But large degree determined by your compliance post op
- Retainers
Patient friendly description of resorption
When roots of teeth shorten after tx
About 1mm in normal in 2yrs some is inevitable due to forces on tooth to move it, however if it becomes excessive might need to intervene/stop tx and require further tx
Patient friendly description of decalcification
Early decay - white spots on the teeth
Caused by poor oH
Brackets make it harder ot maintain oH therefore really need to focus on keeping it good, OH, Brushing, MW, TP brushes
White spots = early decay
Want to make sure we dont have them permanently/ develop into decay
Patient friendly description of recession
This is when the gums shrink back
Can see more root than usually
Aesthetic issue
Can increase sensitivity + caries risk as the root surface is less mineralised easier to
List benefits of ortho tx
Aesthetics
Function - mastication/speech
Psychological benefit
Dental health - crowding –> caries
List the risks for root resorption
- Type of movement
- Prev trauma
- Nail biting
List the ortho issues that inc risk of relapse
Diastema
Instancing U2s
AOB
Rotations
When is a Hawley retainer used?
Significant OJ to minimise relapse
Compare fixed + removable retainers
Removable Retainers
- Thermoplastic
- Worn/brittle/fracture
- Compliance dependent
- Require replacements
Fixed
- Fixed wire
- Require excellent OH
- Debond caries risk under/ST trauma
