Space Analysis Flashcards
what is the purpose of space analysis in primary dentition
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
what is the lee-way space
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
the size difference of the primary and permanent teeth is known as the:
leeway space
the available space in the arch can be:
equal, greater, or smaller than the unerupted teeth
space analysis is fundamental in determining the treatment plan that might involve:
- extractions
- eruption guidance
- space maintenance
- space gain
- simple monitoring
the methods employed for MDA can be grouped into 3 categories that are:
- use regression equations
- use radiographs
- combination of both
what are the regression equations most widely used
- moyer’s probability tables
- Tanaka and johnston Equations
what is the major drawback of these analyses:
applicability only after the eruption of mandibular permanent incisors
what is the tanaka and johnston analysis
mixed dentition analysis which allows one to estimate the space available in an arch for the permanent teeth to erupt
how is the tanaka johnston analysis done
measure the MD width of all lower incisors
what is the T-J analysis equation
(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
what is the boston university approach and who made it
- Gianelly
- 3+4+5 = 2D + C (lower)
space analysis in permanent dentition determines:
the difference between space available and space required for alignment of permanent teeth
how do you perform the permanent dentition analysis
- 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
space analysis in permanent dentition is done through:
- visualization
- localized
- arch perimeter
- segmental arch analysis
- digital 3D scanning
describe visualization
- nothing is more important than clinical exam
- assessing both arches for overall evaluation of the teeth and their alignments
describe the localized approach
try to figure out where the problem is: anterior or posterior
describe the arch perimeter approach
always compare each arch with the ideal arch in your mind
describe arch circumference approach
when you are dealing with crowded arch, accurate assessment of the arch circumference is crucial
where is MDA done
lower arch only
where is space analysis done
both arches
one of the most accurate devices to measure tooth mass (M-D) size is:
a digital caliper
what is the difference between a manual caliper and a digital caliper
there is less accuracy and more human error with manual
when is the caliper used
to measure arch perimeter
how is segmental arch analysis done
- 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
how is a digital 3D scanner used for space analysis
- measures the width of each tooth by plotting mesial and distal contact points of each tooth then plotted on a digital cast
