Occlusal Problems in the Mixed Dentition

Question 1

what is crown root dilaceration?

Answer 1

bend between crown and root

caused by trauma - displacement of unerupted crown and root continues growth in different direction

Question 2

why might a crown root dilaceration not be removed?

Answer 2

maintain alveolar bone

no need for child to wear denture

Question 3

what are the 2 types of supernumerary tooth?

Answer 3

supplemental - identical copy of adjacent tooth, 2’s, premolars, 8’s
conical/tuberculate - contain tooth material but do not look like teeth

Question 4

in what dentition should a supernumerary be removed?

Answer 4

deciduous - to avoid ortho

Question 5

if teeth are not erupting in a normal patter what could be the cause?

Answer 5

supernumerarys can impede normal eruption

Question 6

where are supernumeraries most common?

if a supernumerary occurs in the maxillary midline what is it called?

Answer 6

premaxilla

mesiodens

Question 7

what teeth are commonly peg shaped?
what can they be associated with?
what problems can they cause?

Answer 7

lateral incisors
absent contra
spacing and aesthetic problems

Question 8

what is there an increased risk of with peg shaped teeth?

Answer 8

ectopic canines

Question 9

what is hypodontia?

Answer 9

the absence of one or more teeth

can be hereditary

Question 10

what teeth are commonly affected by hypodontia?

what can they cause problems with?

Answer 10

U2’s and L5’s

spacing and aesthetics

Question 11

is hypodontia more common in deciduous or permanent dentition?

Answer 11

permanent

Question 12

what does hypodontia commonly present with?

Answer 12

delayed exfoliation of deciduous

delayed eruption of permanent

Question 13

what are infraoccluded teeth?

Answer 13

teeth appear to have shrunk into the gingivae

Question 14

what are neonatal teeth?

Answer 14

deciduous teeth that erupt at birth
can cause feeding problems
if v mobile - extract - bc uncomplete root formation

Question 15

what is an eruption cyst?

Answer 15

blue mucosa overlying unerupted teeth
common with E’s and 6’s
asymptomatic
resolves as tooth erupts

Question 16

what are impacted teeth?

Answer 16

deciduous/permanent teeth that fail to erupt fully

can be partly erupted

Question 17

what can impacted teeth be due to?

Answer 17

obstruction of supernumerary
failure of eruption
insufficient space
ectopic teeth - growing or forming in wrong position

Question 18

if 6’s become impacted what can happen to the E’s?

Answer 18

resorption and caries

Question 19

why does infraocclusion occur?

Answer 19

no perm tooth underneath

ankylosis

Question 20

if an infraoccluded tooth is left what can happen?

Answer 20

tooth next door tips over it

Question 21

why might a deciduous tooth be retained?

Answer 21

missing permanent successor or ankylosis

Question 22

if a deciduous tooth has ankylosed why does it need extraction?

Answer 22

could affect permanent successor - leave in situ if no perm successor

Question 23

why might you lose a deciduous tooth early?

Answer 23

caries/trauma
balancing/compensating extractions
serial extractions

Question 24

what can an avulsion of the deciduous incisors cause?

Answer 24

result in central line shift in incisors

Question 25

what can delayed eruption of a deciduous tooth cause?

Answer 25

permanent successor may be delayed in eruption bc fibrous mucosa

Question 26

what can intrusion of deciduous incisors cause?

Answer 26

deflection of permanent successor

Question 27

what are balancing extractions?

Answer 27

tooth on one side XLA the other. done if concerned about centre line shift
most commonly C’s and D’s cause

Question 28

what are compensating extractions?

Answer 28

tooth XLA in one arch remove in the other to stop over eruption and occlusal interference’s

Question 29

what are serial extractions?

Answer 29

Kjellgren 1948

planned sequence of extraction to relieve incisor crowding in mixed dentition

Question 30

why may 6’s be extracted?

Answer 30

Caries/MIH

want to relieve incisor crowding

Question 31

when should 6’s be extracted?

Answer 31

when all permanent teeth have come in

age 9-10 if want 7’s to erupt well

Question 32

what are crossbites?

Answer 32

can affect any tooth - molars/incisors
unilateral/bilateral
can cause displacement and tooth wear

Question 33

what can treat crossbites?

Answer 33

appliances

Question 34

what can thumb sucking cause?

Answer 34

proclined upper anteriors
retroclined lower incisors
reduced overbite and anterior open bite
buccal segment crossbites

Question 35

how to treat thumb sucking?

Answer 35

deterrent devices
plaster on finger
encouragement
nail varnish

Question 36

what percent of 6 year olds have a median diastema?

Answer 36

98%

Question 37

when does a median diastema occur?

Answer 37

small teeth/large jaws
missing lateral incisors
midline supernumerary
prominent frenulum
proclined upper incisors

Question 38

if under what size in the deciduous dentition can you leave a diastema?

Question 39

where do E’s commonly impact?

Answer 39

distal of D’s

Question 40

why might central incisors be impacted?

Answer 40

supernumeraries
crown root dilaceration
trauma
premature loss of deciduous

Question 41

when should you be able to palpate the canines?

Answer 41

8-10 years

Question 42

if 3’s are impacted what can be done?

Answer 42

extract c’s to allow eruption

Question 43

if you cant palpate the 3’s at 10 years do what?

Answer 43

DPT

ensure no cyst has developed