exam questions

Question 1

bodily movement

Answer 1

translation is example

system of forces - force NOT passing through center or resistance and couple

moment / force ration 10:1

single force at center of resistance (but not appliacable in the mouth)

Question 2

inter-incisal angle that is larger than the norm could indicate

Answer 2

overbite

if larger than normal - likely because of lingual inclination of the maxillary incisors

Question 3

14. During transition from the mixed to the permanent dentition the anteroposterior arch length increase at the time of eruption of the premolars?

Answer 3

false – there is a slight decrease in BOTH ARCHES IN TERMS OF LENGTH

ARCH WIDTH INCREASE

MAX CIRCUMFERENCE INCREASE

MANDIBULAR CIRCUMFERENCE DECREASE

Question 4

LEEWAY SPACE ON maxilla and mandible

Answer 4

maxilla 1.2

mandible 3.1

Question 5

most common feature of dentla arch maloclsuionn

Answer 5

crowding

Question 6

17. the lingual arch space maintainer is usually not indicated in a patient with primary incisors

Answer 6

true

Question 7

18. an ectopically erupting tooth can cause crowding in the dental arch because it is replacing the wrong primary?

Answer 7

true

Question 8

19. guided eruption involves sequential slenderizing and extractions of permanent teeth in order to resolve crowding?

Answer 8

true

can include the extractions too= serial extractions- when over 10 mm of mandibular crowding exists and extractions of 4 premolars is required

Question 9

conequence of molar uprighting aka

Answer 9

extrusion – and reduciton of the clinical crown is then often needed

Question 10

23. if minimal extrusion is desired during molar uprighting a straight wire with coil springs should be used?

Answer 10

false –use of SS wire with T loops is better if control is needed and if extrusion is not desired

Question 11

24. uprighting a molar that is tipped mesially by 30 degrees requires 12 months of treatment?

Answer 11

false
4 weeks = 10 degrees

12 months = 48 weeks

Question 12

25. most of the time a molar is uprighted by mesial root movement? keep in mind?

Answer 12

false – and distal `crownn movement can create interferences and potentially open bite – if need preping will you need endo first??

Question 13

26. in the case of missing maxillary lateral incisors in a patient that extraction of mandibular premolars is required, treatment is usually performed by canine substitution?

Answer 13

true – if class II want to try and close space and have canines become laterals

if extracting lowers – spacing is already a problem

Question 14

27. In order to avoid crown lengthening after forced eruption the extrusion should be performed at the rate of 1 mm per month?

Answer 14

false – slow extrusion – bone will follow and CLP will be needed

in rapid - 1mm / week - light forces required and if too fast can ankylosis - but this rapid will leave alveolar bone behind

Question 15

rapid or slow extrusie mechanisms during forced eruption?

Answer 15

depends on whether coronal movement of bone is needed

if preserving bone – and bringing with = slow

Question 16

stabilization period after eruption

Answer 16

6 months retention with passive arch wire recommende to avoid significant relapse

Question 17

fiberotomy?

Answer 17

considered in adjunct to mechanical retention if tooth was severly rotated
helps eliminate fibers that resist the new position

Question 18

wall defects and ortho

Answer 18

1 and 2 (hemiseptal) – moves teeth closer to the TREATED defect

craters and 3 wall defects DONT improve w/ ortho

NOT 3

Question 19

tx for thick and fibrotic gingivl tissue with gummy smile

Answer 19

perio surgery to expose the complete crown length

Question 20

35. When a gingival margin discrepancy between adjacent teeth exists and the shorter tooth has a deeper sulcus the treatment of choice is excisional gingivectomy of the shorter tooth?

Answer 20

true – indicates gingval margin off

if gingiva was in line but shorter than adjacent - know something wrong with incisal edge

Question 21

orthointrusion or gingival surgery?

Answer 21

evaluate labial sulcualr depth of teeth

UNIFORM = truama of incisal edges – intrude and restore

DIFFERENCES = gignival surgery

Question 22

missing papilla can be caused by

Answer 22

divergent root shapes
abnormal tooth shape
advanced perio disease

Question 23

treatment for divergent roots and no papilla

Answer 23

upright incisors and close space

Question 24

38. when the roots of maxillary central incisors are divergent, recontouring of the mesial surfaces of the crowns can be performed to correct the missing papilla?

Answer 24

NO – not for divergent roots but could do this for mishaped teeth

Question 25

40. ideally the gingival margin of the central incisors is about 1mm coronally to the lateral incisors

Answer 25

FALSE - 1mm apical

centrals and cuspids at same level

Question 26

44. in the case of congenitally missing the mandibular 2nd premolar, extraction of the primary 2nd molar is always indicated when primary molar is ankylosed and facial growth is complete

Answer 26

fasle – can keep the tooth there to preserve bone and recontour it

Question 27

he Hawley retainer is recommended after extraction treatment?

Answer 27

false – this is the traditional one

the wrap around one is for extraction cases

Question 28

use what after correction of midline diestams

Answer 28

fixed retainers

Question 29

after molar uprighting alveolarbone position?

Answer 29

expected to be more inferior