Determinate:
meaning that the moments and forces can readily be discerned, measured and evaluated(one-couple system)
Indeterminate:
indeterminate systems are too complex for precisely
measuring all forces and moments involved in the equilibriumTypically, only the direction of net moments and approximate net force levels can be determined (two-couple sytem)
Determinate systems in orthodontics:
are those in which a couple is created at one end
of an attachment, with only a force (no couple) at the other.
This means that a wire that will serve as a spring can be inserted into a tube or bracket at one end, but must be tied so
that there is only one point of contact on the other
When the wire is tied into a bracket on both ends, astatically indeterminate two-couple system has been created.
*a cantilever spring:
arch wire is placed into a bracket or tube. It typically
attaches to a tooth or teeth that is part of a stabilized
segment and the other end of the cantilever spring or auxiliary arch wire is tied to a tooth or group of teeth that are to bemoved, Math a single point of force application.
Indeterminate Two couple appliance system:
*Force system depends on wire-bracket geometry
*Stright segment of wire in misaligned brackes
*V bend priciple
*Lingual arches as two couple system
2. Determinate:
meaning that the moments and forces can readily be
discerned, measured and evaluated(one-couple system)
Indeterminate:
indeterminate systems are too complex for precisely
measuring all forces and moments involved in the
equilibriumTypically, only the direction of net moments
and approximate net force levels can be determined (two-
couple sytem)
3. Determinate systems in orthodontics:
are those in which a couple is created at one end
of an attachment, with only a force (no couple) at the other.
This means that a wire that will serve as a spring can be inserted
into a tube or bracket at one end, but must be tied so
that there is only one point of contact on the other
When the wire is tied into a bracket on both ends, astatically
indeterminate two-couple system has been created.
4. One-couple Systems
*a cantilever spring:
arch wire is placed into a bracket or tube. It typically
attaches to a tooth or teeth that is part of a stabilized
segment and the other end of the cantilever spring or auxiliary arch
wire is tied to a tooth or group of teeth that are to bemoved, Math a
single point of force application.
6. Indeterminate Two couple appliance
system:
*Force system depends on wire-bracket geometry
*Stright segment of wire in misaligned brackes
*V bend priciple
*Lingual arches as two couple system
