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CLASPS www.indiandentalacademy.co m


INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com

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• The name clasp is derived from a French word “UYPTAN” which means “to embrace”. Clasps are the retentive components of the orthodontic appliances.

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•RETENTION :- is the means whereby the displacement of an appliance is resisted.

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IDEAL REQUIREMENTS  Unobtrusive.  Not impinge.  Close contact to the tooth.  Usable in both deciduous and permanent dentition.  Adequate retention.

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 No active force on the anchor tooth.  Rigid  Easy to fabricate and also replace if needed.  Not interfere in the growth of jaws and eruption of teeth.

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USES • To secure the appliance in position • To prevent rolling of appliances • To resist forces of displacement • To provide retention & anchorage • For engaging elastics

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CLASSIFICATION A.

Hand Made Machine Made.

B.

Single tag arm Double tag arm www.indiandentalacademy.co m


MODE OF ACTION • Clasp engage onto the undercuts (constricted areas on the teeth.) • Two types of undercuts. – Buccal / Lingual Cervical undercuts. – Mesial / Distal Proximal undercuts.

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CIRCUMFERENTIAL CLASP

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• Circumferential clasp / C-Clasp / 3/4th Clasp. • It uses the bucco-cervical undercut. • 2nd molars and canines. • Single retention arm. • 1mm wire used in molars.

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Advantages • Good retention. • Easy to fabricate. • Single occlusal crossover wire. • Easy to replace.

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Disadvantages • Not on semi-erupted tooth. • Decalcification of cervical margin. • Gingival irritation. • Plaque accumulation enhanced. • Easily distort.

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JACKSONS CLASP www.indiandentalacademy.co m


• V.H. Jackson 1906 • Jacksons Clasp / Full Clasp / U Clasp. • Both bucco-cervical and proximal undercuts. • 0.7mm to 1mm.

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Advantages • Simple design • Adequate retention.

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Disadvantages • Not useful in partially erupted teeth. • Difficult to adjust. • Not on unfavourably inclined tooth.

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SOUTHEND CLASP www.indiandentalacademy.co m


• Most common for anterior anchorage. • Single arrowhead between Central Incisors with wire following the gingival margin.

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Advantages • Unobtrusive. • Good retention. • Even be used if Incisors are proclined.

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TRIANGULAR CLASP

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• Also called as MODIFIED ZIMMER CLASP. • Excellent retention by the single arrowhead in the interproximal area. • Free end towards distal to facilitate the engagement of elastics. • 0.7mm wire www.indiandentalacademy.co m


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Advantages • Easy to fabricate. • Excellent retention. • Pre fabricated available. • Elastics can be engaged.

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Disadvantages • Not useful if adjacent tooth is absent. • Used as secondary / additional retention.

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BALL END CLASP www.indiandentalacademy.co m


• Action and location similar to triangular clasp. • Pre fabricated available. Can be made by adding solder to end of a wire.

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Advantages • Easy to fabricate. • Single occlusal interference. • Less gingival irritation. • Easy to replace.

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Disadvantages • Short arm makes adjustment difficult. • Cannot be used for primary retention. • Cannot be used in absence of adjacent tooth.

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SCHWARZ CLASP www.indiandentalacademy.co m


• Also called as ARROWHEAD CLASP. • A.M. Schwarz 1935. • Mesial and distal undercuts of the teeth.

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Advantages • Reliable retention. • Does not interfere in posterior occlusion. • More length of wire hence more flexible. • More easy to adjust. • Enhances eruption.

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Disadvantages • Difficult to fabricate. • Needs special plier. • Irritates soft tissue. • Tends to separate teeth. • Is bulky hence less patient compliance.

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CROZAT CLASP www.indiandentalacademy.co m


• Crozat in 1920 • Along with the u clasp another curved wire is soldered on the base (Crescent). • Strong retention is possible

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ADAMS CLASP www.indiandentalacademy.co m


• Adams clasp / modified arrowhead clasp / liverpool clasp / universal clasp. • C. PHILIPS ADAMS in May 1950. • Most widely used clasp. • Distobuccal and mesiobuccal undercuts. • Does not separate teeth like a arrowhead clasp. • 0.7mm posteriors 0.6mm anteriors. www.indiandentalacademy.co m


Parts BRIDGE 2

ARROWHEADS 2 TAG ARMS

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BRIDGE • Is 2/3rd the mesio-distal width of the tooth, or slightly less then the distance between mesiobuccal and distobuccal undercuts, or length should be equal to the intercuspal distance. • Is 1-2mm away from the buccal surface of the tooth. • Is at 45o to the buccal surface of the tooth. • Should be straight.

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Arrowheads • They should lie in the disto and mesio buccal undercuts. • Shaped according to the curve of the gum margins into the interdental papilla. • Long enough to keep the bridge at a proper distance. • Should not touch the adjacent teeth

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Tag arms • Closely fitted to the contact points, down to the interdental embrassure. • Space between the tag arms and palate for flow of acrylic. • No sharp bends.

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FABRICATION

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Advantages • • • • • • •

Small,neat and unobtrusive. Any tooth. Both deciduous and permanent dentition. Even on semi erupted tooth. No specialized pliers required. Can be modified as needed. No. of modifications are available.

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Disadvantages • Unwanted palatal tipping if gets activated. • May lead to elongation of tooth if is fitting tightly. • Can be repaired only if fractured through the arrowheads. • Cannot be given on proclined anteriors.

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MODIFICATIONS

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Anterior Adams • 0.6mm • Also called double clasp.

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With distal extension/ traction hook • To engage elastics • Not given if sulcus is shallow.

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With eyelet

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With a soldered hook

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With a soldered tube

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With a single arrowhead

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With accessory arrowhead

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Smart clasp

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• It is used in magnetic activator devices • Wire used 0.7mm • Bend 2mm loop on each side along with arrow head • It can be modified to double clasp on premolars and molars for extraoral traction www.indiandentalacademy.co m


ADVANTAGES • Coils of the smart clasp increases spring back property. • Reduces frequent tightening. • Can be used with any type of removable appliances like bite blocks, palatal expanders.

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Delta clasp

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• William J. Clark • Used in twin block appliances • Retentive loops were triangular in shape hence the name “Delta” • Retains the basic elements of Adams clasp like retentive loops and a buccal bridge www.indiandentalacademy.co m


ADVANTAGES • Design of the closed loop does not open up with repeated removal. • Less subject to breakage. • Provides excellent retention on lower premolars. • Suitable for use on most posterior teeth. www.indiandentalacademy.co m


Thank you www.indiandentalacademy.com Leader in continuing dental education

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