adams clasp practice
TRANSCRIPT
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epartmentDrthodontic O
DR.Naser Rashed
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Adams clasp
. Adams clasp was first decried by Professor Phillip Adams
It is also known as Liverpool clasp, universal clasp and modified arrowhead
clasp .
The clasp is constructed using 0.7mmhard round stainless steel wire .
Adams clasp is made up of three parts .
(a) Two arrowheads
(b) Bridge
(c) Two retentive arms
Two arrowheads engage the mesial and the distal proximal undercuts .
The arrowheads are connected to each other by a bridge the is at degree to the
long axis of the root .
fig :- Adams clasp
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Steps in fabrication of Adams clasp
1- Plier required for constructing appliances :
Adams pliers, spring forming pliers, mauns cutters
2- A good quality working model cast in stone is required
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4- Mark position of mesial and distal undercuts.
5- Prepare undercuts These should be prepared to approx. 1mm in depth Avoid trimming the buccal surface of tooth.
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6- Straighten a piece of 0.7mm stainless steel wire.
7- Make a 90 degree bend.
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8- Mark the length of the bridge onto the wire
This should be the distance between the two marks on the model where
the arrowheads will engage the undercuts.
9- Make another 90 degree bend.
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10- Check length of bridge against model.
11- Forming the arrowhead’s first bend
The length of the arrowhead is determined by crown height of tooth
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12- Forming the arrowhead’s first bend
The length of the arrowhead is determined by crown height of tooth.
13- First arrowhead formed
Both sides of arrowhead should be parallel
First bend into arrowhead should be 90° to bridge.
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14- Forming second arrowhead.
15- Arrowheads are angled to follow tooth contours.
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16- Check angles and arrowheads are parallel.
17- Second bend from the arrowhead
This bend should be below the height of the bridge
This is achieved by clasping the arrowhead halfway up the outer side,
prior to bending
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18- By using the tips of the adams pliers, adjust bend until wire touches
contact point prior to crossing the occlusion.
19- Check position of arrowheads and angulations of bridge
Angle of bridge is 45° to long axis of tooth.
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20- Adaptation of wire across occlusion.
21-Check position and fit.
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22- Bring wire 2/3 into palate to form tag end.
23- Uniform spacing of 1mm with a foot at the end of tag.
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24- Distal tagging should lie forward to allow sufficient space for contour
of acrylic baseplate.
25- Arrowheads must engage undercuts
Bridge should be of sufficient length to allow arrowheads to engage
undercuts
Bridge should be parallel to occlusal plane
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26- Bridge should lie at approximately 45 degrees to long axis of the
tooth.
27- First point of contact out of the arrowhead should be the contact
point prior to crossing the occlusion.
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28- Overview of crib
Bridge follows line of arch