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BDS4 - 2nd Time Lucky > Mock SCR Dec 2023 - Ortho > Flashcards

Mock SCR Dec 2023 - Ortho Flashcards

(67 cards)

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1
Q

Purpose of study models

A

treatment planning
patient motivators
secondary opnionn
designing a removable appliance
to look at a persons occulsion

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2
Q

Advatantages of a URA

A

Tipping teeth
excellent anchorage
allows pt to remove and clean to maintain good OH
block movement
overbite reduction
less specailised training
cheaper
shorter chairside time

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3
Q

Disadvatanges of a URA

A

can easily be removed by the patient
can only move on or two teeth
less precise movement
cannot deal with rotations

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4
Q

Active compontent

A

what actually moves the tooth

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5
Q

Retention

A

resistance to displacment forces
speech
gravity
tongue
active component
mastication

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6
Q

Anchorage

A

the resistance to unwanted tooth movement

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7
Q

Baseplate

A

self cured PMMA
Connector and retention and anchorage

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8
Q

Removable appliance made of

A

Stainless steel composed of:
- iron - 72%
- Chromium - 18%
- Nickel - 8%
- Titatnium - 1.7%
- Carbon - 0.3%

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9
Q

Fitting a URA instructions

A

check the appliance design matches the design speicification for the patient
check the pt details matches the details of the appliance
run finger over the fitting surface to check for sharp edges
check the integrity of the wirework
place in the pts mouth and check for areas of blanching
activate the posterior retention - flyovers then arrowheads
active the anterior retention - flyovers then arrowheads
demo to the pt how to insert and remove the appliance
review the pt every 4-6weeks
activate the component

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10
Q

Patient info and instructions

A

remove the appliance if taking part in contact sports
the appliance may feel big and bulky to begin with
the patient may expereince excessive salivation
the appliance may impinge on speech
wear the appliance 24/7 including meal times
remove the appliance after every meal and clean with a soft bristle toothbrush
talk to pt about compliance and the requirement to attend appts
avoid hard and sticky foods
provide emergency details
may cause intital discomfort and pain

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11
Q

URA to retract 13 and 23

A

A - 13 23 palatal finger spring and guard 0.5mm HSSW
R - 16 26 adams clasps 0.7mm hssw and 11,21 southend clasps
A - good as only moving 2 tewth
B - self cured PMMA

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12
Q

URA to retract 13 and 23 and reduce OB

A

A - 13,23 palatal finger spring and guard 0.5mm HSSW
R - 16,26 adams clasps 0.7mm HSSW and 14 and 24 adams clasp 0.7mm HSSW
A - good as only moving 2 teeth
B - self cured pmma with flat anterior bite plane - OJ + 3mm

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13
Q

URA to correct anterior crossbite

A

A - z spring - 0.5mm HSSW
R - 16, 26, 14,24 Adams clasp 0.7mm HSSW
A - good as only moving 1 tooth
B - self cued PMMA with a Flat posterior bite plane

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14
Q

URA to retract buccally placed 13 and 23 and reduce OB

A

A - 13, 23 buccal canine retractor with 0.5mm HSSW and 0.5mm I.D tubing
R - 16, 26 adams clasps and 11,21 southend clasps
A - good as only moving 2 teeth
B - self cued PMMA - flat anterior bite plane - OJ + 3mm

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15
Q

URA to reduce OJ 21,22,11,21 and OB

A

A - roberts retractor 0.5mm HSSW and 0.5mm I.D tubing
R - 16,26 adams clasps and mesial stops on 13 and 23
A - good as short rooted teeth
B - self cured PMMA - flat anteiror bite plane - OJ +3mm

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16
Q

Expanding upper arch

A

A - midline palatal screw
R - 16, 26, 14,24 Adams Clasp 0.7mm HSSW
A - good as reciprocoal anchorage
B - self cured PMMA with a Flat posterioer bite plane

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17
Q

Class 2 div 1

A

when the lower incisors lie posterior to the cingulum plaeteu of the upper incisors
the upper incisors are proclined or of average value
the oj is increased
there is a narrow upper arch
digit or thumb sucking habit present lips incompteent with lip trap present

Accept, growth mod, camofloufage, orthognathic surgery if completed growth

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18
Q

Class 2 div 2

A

when the lower incisor edge lies behind to the cingulum plaeteu of the upper incisors
the upper incors are retroclined
oj is minimal or increased

upper laterals the cingulum can be reduced
the upper 2’s have mesiolabially rotation present and proclined

high lower lip line <FMPA and LAFH, lip trap

Accept, growth mod to get to class 2div 1, camoflauge, orthognathic surgery

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19
Q

Class 3

A

when the lower incisors lie anterior to the cinglum plaeatu of the upper incisors
the upper incisors are procline and lowers are retroclined
the oj is reversed

can casues tmj issues, ging recession, asymmetry, speech probs, asethetics

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20
Q

How to assess the anterior posterior position

A

have the frankfort plane horizontal to the floor and palpate the skeletal bases
by the use of a lateral ceph

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21
Q

Purpose of URA

A

habit breaker
expand the upper arch
anchroage
tipping teeth
space maintaner
reduce overbite

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22
Q

Andrews 6 keys

A

class 1 molar and incisor relationships
tight approximal contacts with no contacts or rtoations
from the canines posterior slight lingual inclination
flat occlusal plane or slight curve of spee
long axis of tooth with mesial inclination

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23
Q

Types of anchorage

A

simple
compound
reciprocal
absolute
conical (quadhelix, palatal arch with nance button, transpalatal arch)

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24
Q

Function of quadhelix

A

bilateral expansion
habit breaker
for cleft lip and palate
fan expansion
aymmetrical expansion
rotation of molars

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25
Relapse most prone in
AOB crowding rotations midline diastema ectopic canines
26
OJ
the horizontal distance between the labial surface of the upper incisors and the labial surface of the lower incisors
27
OB
the vertical overlap between the upper and ower teeth - usually 50% 1/3rd
28
Crossbite
when the lower arch lie outside the position of the upper teeth the buccal cusp of the lower teeth lie more buccally than the buccal cusp of the upper teeth
29
Anterior open bite
no vertical overlap present between the upper and lower incisor teeth
30
Causes of AOB
endogenous tongue thrust low labial frenum digit or thumb sucking supernumuerary present class 3 malocclusion cerbral palsy
31
Assess the vertical pattern
by the upper anterior face height:lower anterior face height (glabella:subnasale - subnasale:menton) by the FMPA - the frankfort - porion to orbitale and the mandibular - the gonion to menton
32
Assess the transverse position
TMJ and symmtery checked
33
Soft tissues
lips - competent/incompetent lip trap present TMJ asyymetry nasioloabial angle tooth showing lip trap present
34
Intra oral look for
eruption of teeth OH Perio Centrelines Incisor relationship Molar relationship missing teeth crowding present supernumerary teeth AOB OJ OB upper incisoros - proclined etc rotation crossbites present
35
Retained primary teeth causes
absent successor ectopic tooth/canine dilacerated succesor infraocclued primary tooth
36
Most common infraocculuded tooth
in the manidble and the lower D mandble>maxilla
37
Tx for an infraoccluded tooth
if absent premanent then can maintain or xla with band and loop on 6's and can have distal stiops on 4's if present permanenet then can xla when contacts go subging or when root formation complete on the the permanent tooth
38
When is the best time to carry out an XLA of a molar tooth?
at calcification of bifurcation of the 2nd molar starting to calcify usually around 8.5-9.5 years
39
What is the incidiences of missing upper lateral incisors?
2%
40
What is the most common missing tooth type
lower 3rd molars lower premolars upper laterals
41
What are the indications for a lateral ceph
to aid diagnosis treatment planning progress monitoring
42
When is a CBCT carried out
for cleft lip and palate ts orthognathic cases impacted teeth and resoprtion/ adj to each other view of sturcture anomalie
43
Tests for infra occluded teeth
palpation mobility sound/percussion radiographs
44
Casues of impacted 1st molars
eruption cysts long path of insertion crowding small maxilla
45
What do you check with impacted 1st molars
check mobiiligy of E's can cause pulpitis of E's or premature exfoliation of E's
46
Anterior cross bite
palpate canines at 9years
47
Issues with anterior cross bite
ging recession tooth erosion speech and aesthetics displacement on closure mobiligy lower incisors
48
How to manage an anterior cross bite
URA with a zpring or Tspring if premolar/molar
49
Causes of an anterior open bite
presence of supernumarary digit sucking low frenum delayed eruption underlying skeletal discrepancy disabilities - cerebral palsy tongue thrust
50
What measurement do you carry out orthgnathic surgery for an anterior open bite?
>4mm
51
Ectopica canines intra oral
palpate buccal and palatal to see if can feel the permanenet successor check mobility and colour of primary canine positin of lateral incisors mobility of lateral incisors
52
What investigations to carry out for an ectopic canine
OPT and anterior maxilla occlusal or 2PA's CBCT
53
Causes of an ectopic canine
long path of eruption genetic link crowding ectopic position of tooth germ
54
Tx for an ectopic canine
if you leave the canine it risks root resoprtion of lateral incisors, resorption of canine crown ankylosis of erupted canine loss of primary canine Surgical - when the canine is not deemed alignable - this can be when the canine is too high in the apical 1/3rd of incisor root too close to midline or>55 degress to midsggital plane Removable appliance to correct overbite autotransplantation when the malpostion of the tooth is too muc for orth alignment no anklyosis present on canine if the patient requires quicker tx
55
Risks of ortho
relapse soft tissue trauma decalcification root resoprtion loss of perio support toothwear allergy loss of vitiality ulceration headgear truama
56
Types of retention
Hawley retainer thermoplastic retainer fixed retatiner
57
Advantages and dis of fixed retainer
Adv - compliance, anesthetics, non invasive, done chairside and cheap Dis - poor OH, does not incorporate all teeth, etching damages the teeth, 50% fail
58
Adv and dis of hawley
Adv - removable so OH good, incoporates all teeth, strong, allows occusal setting, minor tooth movement Dis - removable so pt complaince, speech issues, aesthetis, expensive and time consuming to make, invasive on tongue
59
Adv and dis of thermoplastic
Adv - aesthetics, less invasive, all teeth, OH good, cheaper, easier to make Dis - non resilant, does not allow occlusal setting, complaicne, easily lost, distorted with heat
60
Supernumary teeth common in
anterior region and males more than females, gardener syndrome children with cleft lip celdocredial dysplasia
61
Functional applaince indications
average or reduced FMPA uncrowded arches lower incisors upright or retroclined mild to mod class 3
62
How does a functional applaince work?
enhancment of mandibular growth by movement of the mandibular condyle out of fossa, promoting growth of the condylar cartilage, and forward migration of the glenoid fossa
63
What does the AP position measure?
The overjet
64
What does the vertical position obtain
overbite - if behind the occipiut then a reduced FMPA
65
Transverse position
for centre lines and occlusion
66
what to look for in an I/O exam for ortho
caries perio OH Missing teeth dentition type
67

BDS4 - 2nd Time Lucky (3 decks)

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