Space Analysis

Question 1

what is the purpose of space analysis in primary dentition

Answer 1

calculate the differences between the amount of the dental arch space available and that required for accomodating the permanent teeth for planning either preventative or interceptive approach

Question 2

what is the lee-way space

Answer 2

the space occupied by the primary canines and molars is greater than that required for the corresponding permanent teeth, the canine and the two premolars

Question 3

the size difference of the primary and permanent teeth is known as the:

Answer 3

leeway space

Question 4

the available space in the arch can be:

Answer 4

equal, greater, or smaller than the unerupted teeth

Question 5

space analysis is fundamental in determining the treatment plan that might involve:

Answer 5

• extractions
• eruption guidance
• space maintenance
• space gain
• simple monitoring

Question 6

the methods employed for MDA can be grouped into 3 categories that are:

Answer 6

• use regression equations
• use radiographs
• combination of both

Question 7

what are the regression equations most widely used

Answer 7

• moyer’s probability tables
• Tanaka and johnston Equations

Question 8

what is the major drawback of these analyses:

Answer 8

applicability only after the eruption of mandibular permanent incisors

Question 9

what is the tanaka and johnston analysis

Answer 9

mixed dentition analysis which allows one to estimate the space available in an arch for the permanent teeth to erupt

Question 10

how is the tanaka johnston analysis done

Answer 10

measure the MD width of all lower incisors

Question 11

what is the T-J analysis equation

Answer 11

(MD width four lower incisors) x 1/2 =
- maxilla +11 = MD U 3,4,5 per quad
- mandible + 10.5 = MD L 3,4,5 per quad

Question 12

what is the boston university approach and who made it

Answer 12

• Gianelly
• 3+4+5 = 2D + C (lower)

Question 13

space analysis in permanent dentition determines:

Answer 13

the difference between space available and space required for alignment of permanent teeth

Question 14

how do you perform the permanent dentition analysis

Answer 14

• measure the MD width of each tooth mesial to the first permanent molar
• the total sum of the width corresponds to the necessary space required
• compare these two numbers together

Question 15

space analysis in permanent dentition is done through:

Answer 15

• visualization
• localized
• arch perimeter
• segmental arch analysis
• digital 3D scanning

Question 16

describe visualization

Answer 16

• nothing is more important than clinical exam
• assessing both arches for overall evaluation of the teeth and their alignments

Question 17

describe the localized approach

Answer 17

try to figure out where the problem is: anterior or posterior

Question 18

describe the arch perimeter approach

Answer 18

always compare each arch with the ideal arch in your mind

Question 19

describe arch circumference approach

Answer 19

when you are dealing with crowded arch, accurate assessment of the arch circumference is crucial

Question 20

where is MDA done

Answer 20

lower arch only

Question 21

where is space analysis done

Answer 21

both arches

Question 22

one of the most accurate devices to measure tooth mass (M-D) size is:

Answer 22

a digital caliper

Question 23

what is the difference between a manual caliper and a digital caliper

Answer 23

there is less accuracy and more human error with manual

Question 24

when is the caliper used

Answer 24

to measure arch perimeter

Question 25

how is segmental arch analysis done

Answer 25

• measure MD width of every single tooth
• measure mesial of 1st molar to distal of lateral incisor
• measure distal of lateral incisor to mid line

Question 26

how is a digital 3D scanner used for space analysis

Answer 26

• measures the width of each tooth by plotting mesial and distal contact points of each tooth then plotted on a digital cast