SAS 3 Clinical Significance of Oral Anatomy, Histology,Physiology and Occlusion to Operative Dentistry

Question 1

The primary dentition consists of ?

Answer 1

10 maxillary and 10 mandibular teeth

Question 2

Permanent dentition consists of how many teeth ?

Answer 2

16 maxillary and 16 mandibular teeth

Question 3

The primary and permanent dentitions include?

Answer 3

Incisor, canine and molar classes

Question 4

The fourth class of human teeth is the?

Answer 4

Premolar

Question 5

Where does the premolar or the fourth class found?

Answer 5

Only in permanent dentition

Question 6

cutting or shearing instruments for food, essential for proper esthetics of the smile, facial soft tissue contours (lip support) and speech (phonetics).

Answer 6

Incisors

Question 7

possess the longest root of all teeth, corners of the mouth. They function in the seizing, piercing, tearing and cutting of food.

Answer 7

Canines

Question 8

serve a dual role in function, they are similar to canines in tearing of food and are similar to molars in the grinding of food.

Answer 8

Premolars

Question 9

serves as fulcrum during function. Have a major role in crushing, grinding and chewing of food to the smallest dimensions.

Answer 9

Molars

Question 10

covers the anatomic crown of the tooth and varies in thickness in different areas.

Answer 10

Enamel

Question 11

is thicker at the incisal and occlusal areas of a tooth and becomes progressively thinner until it terminates at the cementoenamel junction.

Answer 11

Enamel

Question 12

It is semi translucent, and the color of a tooth which varies from light yellow to gray-white depends on the color of the underlying dentin, thickness of the enamel and amount of stain in the enamel.

Answer 12

Enamel

Question 13

is composed of 4% water by weight.

Answer 13

Enamel

Question 14

is a highly mineralized crystalline structure containing from 95% to 98% inorganic matter by weight.

Answer 14

Enamel

Question 15

in the form of a crystalline lattice, is the largest mineral constituent and is present 90% to 92% by volume.

Answer 15

Hydroxyapatite

Question 16

is composed of millions of enamel rods or prisms, which are the largest structural components, and rod sheaths and a cementing interrod substance in some areas.

Answer 16

Enamel

Question 17

are KNIFE EDGE OR ORIENTED OUTWARD IN A SLIGHTLY APICAL DIRECTION.

Answer 17

Permanent teeth

Question 18

are KNIFE EDGE OR ORIENTED OUTWARD IN A SLIGHTLY APICAL DIRECTION.

Answer 18

Permanent teeth

Question 19

are specialized connective tissues of mesodermal origin, formed from the dental papilla of the tooth bud.

Answer 19

Dentin and pulp tissues

Question 20

is considered living tissue with the capability to react to physiologic and pathologic stimuli.

Answer 20

Dentin

Question 21

Externally, it is covered by enamel on the anatomic crown and cementum on the anatomic root.

Answer 21

Dentin

Question 22

Forms the walls of the pulp cavity ( pulp chamber and pulp canals )

Answer 22

Dentin

Question 23

is approximately 75% inorganic material, 20% organic material, and 5% water and other materials.

Answer 23

Dentin

Question 24

Which is less mineralized ? Dentin or enamel ?

Answer 24

Dentin

Question 25

More mineralized than cementum or bone

Answer 25

Dentin

Question 26

During tooth preparation, dentin usually is distinguished from enamel by ?

Answer 26

Color, reflectance,hardness and sound.

Question 27

is normally yellow white and slightly darker than enamel.

Answer 27

Dentin

Question 28

TRUE OR FALSE,

In older patients, dentin is darker, and it can become brown or black in cases in which it has been exposed to oral fluids, old restorative materials, or slowly advancing caries.

Answer 28

True

Question 29

surfaces are more opaque and dull, being less reflective to light than similar enamel surfaces, which appear shiny.

Answer 29

Dentin

Question 30

TRUE OR FALSE

Dentin is softer than enamel?

Answer 30

True

Question 31

occupies the pulp cavity in the tooth.

Answer 31

Dental pulp

Question 32

is circumscribed by the dentin and is lined peripherally by a cellular layer of odontoblasts adjacent to the dentin.

Answer 32

Pulp organ

Question 33

2 division of pulp organ

Answer 33

Coronal pulp and radicular pulp located in the pulp canals in the root portion of the tooth

Question 34

4 functions of the pulp

Answer 34

1. Formative or developmental
2. Nutritive
3. Sensory or protective
4. Defensive or reparative

Question 35

is a thin layer of hard dental tissue covering the anatomic roots of teeth.

Answer 35

Cementum

Question 36

It is slightly softer than dentin and consists of about 45% to 50% inorganic material (hydroxyapatite) by weight and 50% to 55% organic matter and water by weight.

Answer 36

Cementum

Question 37

It has the highest fluoride content of all mineralized tissue. It is also permeable to a variety of materials and is avascular.

Answer 37

Cementum

Question 38

It is a rigid structure that is high elastic modulus, high compressive strength and low tensile strength.

Answer 38

Enamel