Quiz Chapter 8

Question 1

3 different periods of prenatal development

Answer 1

1) preimplantation: Period if the first week
2) embryonic: Extends from the beginning of the second week to the end of the eighth week
3) fetal: Begins with the ninth week and lasts until birth

Question 2

3 different primary embryonic layers

Answer 2

1) ectoderm( outer layer): skin, brain, spinal cord, hair, nails, enamel, lining of oral cavity
2) mesoderm( middle layer): bones, cartilage, muscles, circulatory system, kidneys, lining of abdomen, & dentin, pulp, & cementum
3) endoderm( inner layer): lining of digestive system, lungs & parts of the urogenital system

Question 3

Hard & soft plates

Answer 3

The formation of the palate in the embryo & later in the fetus, takes several weeks

• primary palate
• secondary palate

Question 4

Tooth development

Answer 4

Earliest signs of tooth development are found on the anterior mandibular region when the embryo is 5-6 weeks

At birth there are normally 44 teeth in various stages of development

Question 5

Facial development

Answer 5

The development of the human face occurs chiefly between the fifth & eighth weeks

Question 6

Facial development 1st month up to last trimester

Answer 6

1 month: the forehead is the dominant feature

4 months: the face looks human, the hard & soft palates are beginning to form, & the primary dentition has begun

Last trimester: fat is laid down in the cheeks

Question 7

The two developmental disturbances

Answer 7

Genetic factors: most often concern us tooth & jaw size

Environmental factors: include infections, drugs, & exposure to radiation

Question 8

Facial development after birth

Answer 8

Osteoblasts
Osteoclasts
Modelings & remodelling

Question 9

Life cycle of a tooth

Answer 9

Growth
Calcification
Eruption

Question 10

Growth period

Answer 10

The bus stage: the formation of the tooth begins

The cap stage: the calls of the developing tooth increase

The bell stage: the different tissues of the tooth form & it’s shape are established

Question 11

Succedadeous teeth

Answer 11

Permanent teeth that replace primary teeth

Question 12

Eruption of primary teeth

Answer 12

The movement of the tooth into its functional position in the oral cavity

Question 13

Shedding or exfoliation of primary teeth

Answer 13

Primary teeth are lost as permanent teeth develop

Question 14

Eruption of permanent teeth

Answer 14

The permanent tooth erupts into the oral cavity in a position lingual to the roots of the shedding primary anterior tooth or between the roots of the shedding primary posterior tooth