Growth Studies Readings 1

Question 1

JC presents to your dental office wanting to get orthopaedic treatment. With your knowledge of bone development, you decide to take a radiograph of his head. Photographed is a radiograph of his head.

Choose the correct recommendation you’d give JC:

a) JC has not undergone puberty, but it’s a good time to start getting orthopaedic treatment within this year.

b) JC has undergone puberty, so the therapeutic benefits of treatment is limited. Not recommended.

c) JC has not undergone puberty, but it’s a good time to start getting orthopedic treatment next year.

d) JC is undergoing puberty, would recommend to get orthopaedic treatment as soon as possible.

Answer 1

Reference: Proffit page 78

Answer: a)

This radiograph is showing stage 2 (CVS 2).

Prepubertal stage. Peak interval of mandibular growth should begin within 1 year after this stage.

Question 2

Which statement(s) below is INCORRECT?

a) It is expected that at 6 years of age, 31 and 41 are erupted while 11 and 21 are unerupted.

b) It is expected that the 43 erupts after the emergence of the 44.

c) It is expected that the 23 erupts after the emergence of the 44.

d) It is expected that the emergence of the 25 erupts before the emergence of the 23

Answer 2

b)

Consider eruption sequences of maxillary and mandibular teeth:

Max: 6-1-2-4-5-3-7-8
Mand: 6-1-2-3-4-5-7-8

Reference: MacDonald and Avery’s Dentistry for the Child and Adolescent Chapter 21

Question 3

Barry is 15 months old and his mother is concerned about his teeth. Barry’s mother asks you to examine if any of his teeth is missing. You peer into his mouth and notice erupted 11, 12, ,21, 22, 31, 32, 41, 42.

What would your response be to the mother?

a) Barry is normal and following the trends of tooth eruption.

b) Barry is behind track and may be missing first molars. Recommendation to take a radiograph.

c) Barry is growing teeth quickly and has his lateral incisors erupted early. No problems.

d) Barry is behind track and missing first molars. No recommendation to take a radiograph, wait and see within the next 2-3 months.

Answer 3

Answer a)

First molar eruption is from 12-16 months for primary dentition.

Question 4

One of the statements below is false about environment effects on tooth positioning.

1) Malocclusion of certain teeth may create oppositional forces and overtime, push teeth further into malocclusion.

2) Sucking habits such as pacifier use may overtime, cause shifting of anterior teeth.

3) Tongue thrust, which is due to prolonged tongue pushing on the palatal/lingual surfaces of teeth during swallowing and speech causes malocclusion overtime.

4) Crowding of teeth results in malocclusion

Answer 4

Handbook of Orthodontics page 9

1)

Question 5

What happened here?

a) Gingivitis
b) Squamous Cell Carcinoma
c) Alveolar Abscess
d) Infection

Answer 5

c)

reference: Chapter 3 McDonald and Avery’s dentistry for the child and adolescent

Question 6

What is occurring with the 27 and 26?

a) Alveolar bone loss due to periapical infection

b) Concrescence of molars

c) Syndontia of molars

d) Impaction of molars

Answer 6

b)

reference: Chapter 3 McDonald and Avery’s dentistry for the child and adolescent

Question 7

Question testing your understanding of emergence:

At around the ______ years of age, the 43 and 33 occludes with ______.

a) 10, 14 & 24
b) 9, 14 & 24
c) 9, 53 54, 63 64
d)10, 53 54, 63 64

Answer 7

c) is correct

b) is wrong because eruption of upper arch premolars starts at around 10 years. At 9 years, mandibular canines are erupted, and occlude with upper primary canines.

Maxillary canines erupt at 11 years

Question 8

Question testing your understanding of emergence:

At around the ______ years of age, the 15 and 25 occludes with ______.

a) 10, 74 & 84
b) 9, 45 & 35
c) 10, 45 & 35
d) 9, 74 & 84

Answer 8

Answer is a)

At around 10 months of age, maxillary premolars should be erupted but only 44 and 34 would be erupted. Although there are research articles citing that the 14,24 erupt before the 15,25. It doesn’t change the answer of the question because the 45 and 35 would not be erupted at 10 months, so the primary molars will occlude with the newly erupted premolars.

9 months is too early, neither are erupted.

Question 9

Question testing your understanding of emergence:

Select the false statement:

1) In tooth eruptions, mandibular teeth eruptions always precede maxillary teeth of the same type.

2) At around 11-12 years of age, all premolars and mandibular 2nd molars should be erupted.

3) The 22s and 12s can erupt at the same time as the 43 and 33s

4) The mandibular central incisor and all 1st molars can start to erupt around the same time.

Answer 9

1) is the false statement

at 10-12 years of age, 15 and 25 erupt before 45 and 35.