The Role Of Venn Diagrams In Diagnosing Complex Malocclusions

The Role Of Venn Diagrams In Diagnosing Complex Malocclusions

Write short note on venn’s diagram.
Or
Write short note on venn diagram of classification of malocclusion.
Answer. In orthodontics, an instrument designed by Ackerman and Proffit to attempt to differentiate the many different kinds of problems seen in each of the malocclusion cases defied by Angle.

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Venn diagram adds four other factors (an assessment of tooth alignment, facial profie, transverse problems, and vertical problems) to Angle’s mesiodistal (sagittl) classes of malocclusion.

Description of venn’s Diagram

Group 1 (Intra­arch Alignment and Symmetry)

• In this group analysis of alignment as well as symmetry is done. Various individual tooth irregularities are described.
• Possible malocclusions are crowding, rotations, spacing and the mutilated conditions.
• If abnormalities are not present it is known as ideal.
• As degree of alignment and symmetry is common to all dentition, it is known as Group 1

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Group 2 (Profie)

• As we proceed inside the Venn diagram, profie of patient should be studied.
• So in this group the possibilities are straight profile, convex profile, concave profile and anterior or posterior divergence.

Group 3 (Type)

• Analyze the lateral or transverse characteristics.
• Type is used to describe the kind of crossbites.

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Group 4 (Class)

• It consists of analysis of sagittal/anteroposterior relationship.
• Angle’s classifiation is used.
• Differentiation is made between skeletal and dental malocclusion.

Group 5 (Bite Depth)

• Patient’s skeletal relationship and dentition are analyzed for problems in vertical dimension.
• The overlapping groups are seen in center of Venn diagram.
• Group 9 will have the most severe form of malocclusion comprising problems in all three dimensions.