8. Space Analysis

Question 1

Nance analysis observes space analysis in the (primary/mixed/permenant) dentition

Answer 1

permenant

Question 2

Define space required and space available (nance analysis)

Answer 2

• Space required is the MD sum of the width of the teeth mesial to the first permanent molar
• Space available is the measurement of a wire placed along the incisal edges and occlusal contact points up to mesial of the first permanent molar

Question 3

Lundstrom segmental analysis is observing space analysis in the (primary/mixed/permanent) dentition

Answer 3

permanent

Question 4

Describe space required and space available for lundstron segmental analysis

Answer 4

• Space requires- sum total of MD widths of the teeth mesial to the second permanent molars
• Space available= Dental arch is divided into segments measured as a straight line up to the mesial of the permanent 2nd molar

Question 5

How is space analysis in the mixed dentition predicted

Answer 5

• Moyer’s prediction table
• Tanaka and Johnston prediction formula
• mesurement of teeth on PA X-rays

Question 6

What method of space analysis for mixed dentition is best for the following demographics

• African American
• While
• Northern European
• Asian

Answer 6

• African American = PA X-ray
• White= Moyers/Tanaka and Johnston
• Northern European =Moyers/Tanaka and Johnston
• Asian= PA X-ray

Question 7

Describe the technique to determine space with moyer’s

Answer 7

• MD width of lower incisors
• Plug this number into moyer’s prediction table (75% level)
• MD width of upper and lower canine and PMs

Question 8

What are the Tanaka and Johnston formulas

Answer 8

(MD width of 4 lower incisors /2) + 10.5 mm = one lower canine and two lower PMs estimated width

(MD width of lower incisors/2) + 11 mm = One upper canine and 2 PMs estimated width

Question 9

Bolton analysis determiens

Answer 9

the ratio of the MD widths of the maxillary v.s mandibular teeth

Question 10

What are the two different Bolton ratios

Answer 10

Overall ratio = 91.3

Anterior Ratio = 77.2

Question 11

Overal ratio >91.3 =

Overall ratio <91.3 =

Answer 11

Overal ratio >91.3 = Mandibular overall excess

Overall ratio <91.3 = Maxillary overall excess

Question 12

Anterior ratio >77.2

Anterior ratio <77.2

Answer 12

Anterior ratio >77.2= mandibular ant. excess

Anterior ratio <77.2 = maxillary ant. excess

Question 13

Disharmony between the width of upper and lower teeth can be improved . by

Answer 13

extraction
interdental stripping
bonding to MD of teeth (peg laterals)

Question 14

Bolton excess in the mandible has what characteristics

Answer 14

• Reduced overbite
• Reduced overjet
• Crowding in mandibular arch
• Spacing in maxillary arch
• In presence of peg laterals

Question 15

What are the characteristics of bolton excess in the maxilla

Answer 15

• Increased overbite
• Increased overjet
• Crowding in maxillary arch
• Spacing in mandibular arch
• In absence of lower incisor

Question 16

Functional occlusal plane is defined as

Answer 16

the tangent which runs through the buccal cusp tips of the molar and premolars

Question 17

Supraeruption of incisors is associated with (deep/open bite). Infraeruption?

Answer 17

deep… open

Question 18

A steep curve of spee is often combined with (spacing/crowding)

Answer 18

crowding

Question 19

Ideal curve of spee is (deep/shallow)

Answer 19

shallow (0.5 mm)

Question 20

Mesial drift of posterior teeth is caused by

Answer 20

early loss of primary molars

Question 21

Lateral drift of incisors is usually caused by

Answer 21

premature loss of primary cuspid leading to a blocked out permanent cuspid

Question 22

If the right cuspid is prematurely lost the midline shift will be towards the (left/right)

Answer 22

right