Question 1

Which tooth designation system is most commonly used during orthodontic therapy?&#10;A) Palmer Notation Method&#10;B) Universal Tooth Designation System&#10;C) International Standards Organization Designation System&#10;D) Either the Palmer or Universal systems

Accepted Answer

The system that is most commonly used in orthodontic therapy is the Palmer Notation Method.The Universal Tooth Designation System is the most widely used in United States for the designation of both dentitions because it is adaptable to electronic data transfer.The need for a system that can be used internationally,as well as by electronic data transfer,has been recognized,which is why the World Health Organization accepts the International Standards Organization Designation System.

Question 2

The division of each dental arch into three parts is based on the relationship to the:&#10;A) midline.&#10;B) most posterior tooth.&#10;C) tongue.&#10;D) lips.

Accepted Answer

Sextants divide each dental arch into three parts according to the relationship to the midline: right posterior sextant,anterior sextant,and left posterior sextant.

Question 3

Which of the following statements is correct when discussing the proximal height of contour of a tooth?&#10;A) Located on the facial and lingual surfaces&#10;B) Usually located at the contact area&#10;C) Area of least contour on a tooth surface&#10;D) Also considered the cementoenamel junction

Accepted Answer

The contact areas on the mesial and distal surfaces are usually also considered the locations of the height of contour on the proximal surfaces when in ideal alignment.Thus,the proximal height of contour is the greatest elevation of the crown either incisocervically or occlusocervically on a specific surface of the crown when viewing its profile from the labial/buccal and the lingual.The crown also has a facial or lingual height of contour that is easily seen when viewing the crown's profile from the mesial and the distal.

Question 4

Which of the following terms describes an area of the crown where three surfaces join?&#10;A) Proximal surface&#10;B) Height of contour&#10;C) Line angle&#10;D) Point angle

Accepted Answer

The junction of three surfaces of the crown,the point angle,takes its name from those three surfaces.Each tooth has four point angles.Both the mesial and the distal surfaces between adjacent teeth are considered the proximal surface.Thus,the height of contour is the greatest elevation of the crown.A line angle is formed by the lines that are created at the junction of two crown surfaces.

Question 5

Which of the following characteristics is noted in a patient during the primary dentition period as compared with the permanent dentition period?&#10;A) Larger overall crowns&#10;B) Lighter enamel color&#10;C) Longer roots&#10;D) Greater number of teeth

Accepted Answer

The differences are noted during the mixed dentition period.The primary crowns are lighter in color than the darker permanent crowns owing to the fact that the permanent teeth having less opaque enamel,and thus the underlying yellow dentin is more visible.Also more evident is the difference in the crown size and root length between the smaller and shorter primary teeth and the larger and longer permanent teeth.The jaws undergo the fastest and most noticeable growth during this period,consistent with the onset of puberty,to accommodate the larger size and number of the adult teeth.

Question 6

Which of the following surfaces of a tooth are not difficult to access during dental procedures as well as home care?&#10;A) Facial or lingual surfaces&#10;B) Line angles&#10;C) Proximal surfaces&#10;D) Interproximal space

Accepted Answer

It is more difficult to gain access to the proximal surfaces and the interproximal space than it is to gain access to facial and lingual surfaces,although line angles can also present problems.This access problem occurs for the patient during home care,as well as for the clinician during dental procedures.

Question 7

An older dental term for primary teeth is the _____ dentition.&#10;A) succedaneous&#10;B) second&#10;C) deciduous&#10;D) mixed

Accepted Answer

An older term for the primary dentition is the deciduous dentition.This term is derived from the concept that the primary dentition is shed and replaced entirely by the permanent dentition.Thus,the permanent dentition is the second dentition to develop.The permanent dentition is also sometimes considered the secondary dentition.The permanent dentition is also sometimes considered the succedaneous dentition because most of these permanent teeth succeed primary predecessors.The mixed dentition period follows the primary dentition period.Both primary and permanent teeth are present during this transitional stage.

Question 8

Which of the following is an imaginary line representing the long axis of a tooth?&#10;A) Midline&#10;B) Ridge&#10;C) Root axis line&#10;D) Sextant

Accepted Answer

The root axis line is an imaginary line representing the long axis of a tooth,drawn in a way to bisect the root.Each dental arch has a midline,an imaginary vertical plane that divides the arch into two approximately equal halves,a right and a left.The masticatory surfaces of both anterior and posterior teeth have linear elevations,or ridges.Sextants divide each dental arch into three parts according to the relationship to the midline.

Question 9

How do the incisors function during mastication?&#10;A) Piercing and tearing food&#10;B) Assisting canines with food&#10;C) Biting and cutting food&#10;D) Grinding food

Accepted Answer

The incisors function as instruments for biting and cutting food during mastication.The premolars,which are found only in the permanent dentition,assist the canines in piercing and tearing food.The molars function in grinding food during mastication.

Question 10

Which are considered transitional teeth in the permanent dentition?&#10;A) Incisors&#10;B) Canines&#10;C) First molars&#10;D) Second molars

Accepted Answer

Morphologically,canines can be considered transitional teeth between incisors and premolars in the permanent dentition.Similar to the incisors,the crowns of canines are triangular from mesial and distal views,as are all anteriors,but are pentagonal (or five sided) from labial or lingual views.

Question 11

Which of the following is considered a masticatory surface on a tooth?&#10;A) Lingual surface&#10;B) Palatal surface&#10;C) Incisive surface&#10;D) Buccal surface

Accepted Answer

The answer of Which of the following is considered a...

Question 12

How do the molars function during mastication?&#10;A) Piercing and tearing food&#10;B) Assisting canines with food&#10;C) Biting and cutting food&#10;D) Grinding food

Accepted Answer

The answer of How do the molars function during mastication?&#10;A)...

Question 13

The period of time that occurs between 6 and 12 years of age is the ____ dentition period.&#10;A) mixed&#10;B) primary&#10;C) permanent&#10;D) secondary

Accepted Answer

The answer of The period of time that occurs between...

Question 14

What are the linear elevations located on the masticatory surfaces of both anterior and posterior teeth?&#10;A) Root concavities&#10;B) Ridges&#10;C) Cusps&#10;D) Embrasures

Accepted Answer

The answer of What are the linear elevations located on...

Question 15

When comparing the arches of the two dentitions,one arch of the primary dentition usually contains:&#10;A) two more incisors.&#10;B) four more total teeth.&#10;C) four fewer molars.&#10;D) six fewer total teeth.

Accepted Answer

The answer of When comparing the arches of the two...

Question 16

The tooth surface that is toward the midline of the oral cavity is the:&#10;A) distal.&#10;B) mesial.&#10;C) lingual.&#10;D) buccal.

Accepted Answer

The answer of The tooth surface that is toward the...

Question 17

Which part of the tooth is covered by enamel and remains constant even if the patient undergoes gingival recession?&#10;A) Anatomical crown&#10;B) Clinical crown&#10;C) Anatomical root&#10;D) Clinical root

Accepted Answer

The answer of Which part of the tooth is covered...

Question 18

Which of the following divides each dental arch into quadrants?&#10;A) Cervical line&#10;B) Midline&#10;C) Line angle&#10;D) Point angle

Accepted Answer

The answer of Which of the following divides each dental...

Question 19

When two teeth in the same arch come into contact,the curvatures next to the contact areas form spaces considered:&#10;A) line angles.&#10;B) point angles.&#10;C) height of contours.&#10;D) embrasures.

Accepted Answer

The answer of When two teeth in the same arch...

Question 20

The cementoenamel junction tooth is located at the border of the ____ third of the root.&#10;A) horizontal&#10;B) middle&#10;C) cervical&#10;D) apical

Accepted Answer

The answer of The cementoenamel junction tooth is located at...

Question 21

Which of the following teeth is the first permanent tooth to erupt into the oral cavity,usually signaling the end of the primary dentition period?&#10;A) Maxillary central incisor&#10;B) Mandibular central incisor&#10;C) Maxillary first molar&#10;D) Mandibular first molar

Accepted Answer

The answer of Which of the following teeth is the...

Question 22

During which dentition period may home care become difficult due to crowding that promotes dental biofilm retention?&#10;A) Primary dentition period&#10;B) Mixed dentition period&#10;C) Permanent dentition period&#10;D) Both primary and permanent dentition periods

Accepted Answer

The answer of During which dentition period may home care...

Question 23

Which of the following usually signals the end of the mixed dentition period?&#10;A) Eruption of first primary tooth&#10;B) Eruption of first permanent tooth&#10;C) Shedding of first primary tooth&#10;D) Shedding of last primary tooth

Accepted Answer

The answer of Which of the following usually signals the...

Question 24

Which of the following is the tooth designation system that uses the digits 1 through 32?&#10;A) Universal Numbering System&#10;B) Palmer Notation Method&#10;C) International Numbering System&#10;D) Military Tooth Numbering System

Accepted Answer

The answer of Which of the following is the tooth...

Question 25

Which term is used to describe the method by which the teeth of the mandibular arch come into contact with those of the maxillary arch?&#10;A) Embrasures&#10;B) Occlusion&#10;C) Palmer Notation Method&#10;D) Ridges or cusps

Accepted Answer

The answer of Which term is used to describe the...

Deck 15: Overview of Dentitions