CLASPS 1 /fixed orthodontic courses by IDA

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Information about CLASPS 1 /fixed orthodontic courses by IDA

Published on May 8, 2014

Author: indiandentalacademy


Clasps: Clasps PowerPoint Presentation: INDIAN DENTAL ACADEMY Leader in continuing dental education PowerPoint Presentation: The name clasp is derived from a French word “UYPTAN” which means to embrace. Clasps are the retentive components of the orthodontic appliances. PowerPoint Presentation: RETENTION :- is the means whereby the displacement of an appliance is resisted. Why retention is needed ?: Why retention is needed ? IF poor retention - difficulty to wear-poor pt co-operation. If the appliance is not seated properly-the active components may not function properly due to continual movement of appliance, breakage of springs are liable. :  In children the undercut may lie just below the gingival margin, and it is necessary to construct the clasp so that it displaces the gingival margin slightly. It is important that the clasp does not extend too far into an undercut area. IDEAL REQUIREMENTS: IDEAL REQUIREMENTS Unobtrusive. Not impinge. Close contact to the tooth. Usable in both deciduous and permanent dentition. Adequate retention. PowerPoint Presentation: 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. Clasps should be at the center of the buccal segment to ensure stability of the appliance. CLASSIFICATION: CLASSIFICATION A. Hand Made Machine Made. B. Single tag arm Double tag arm MODE OF ACTION: 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. CIRCUMFERENTIAL CLASP: CIRCUMFERENTIAL CLASP PowerPoint Presentation: Circumferential clasp / C-Clasp / 3/4 th Clasp. To use the bucco-cervical undercut. 2 nd molar and canines. Single retention arm. 1mm wire used in molars. PowerPoint Presentation: Advantages of C clasp: Advantages of C clasp Good retention. Easy to fabricate. Single occlusal crossover wire. Easy to replace. Disadvantages of C clasp: Disadvantages of C clasp Not on semi-erupted tooth. Decalcification of cervical margin. Gingival irritation. Plaque accumulation enhanced. Easily distort. JACKSONS CLASP: JACKSONS CLASP PowerPoint Presentation: V.H. Jackson 1906 Jacksons Clasp / Full Clasp / U Clasp. Both bucco-cervical and proximal undercuts. 0.7mm to 1mm. PowerPoint Presentation: Advantages: Advantages Simple design Adequate retention. Disadvantage: Disadvantage Not useful in partially erupted teeth. Difficult to adjust. Not on unfavorably inclined tooth. SOUTHEND CLASP: SOUTHEND CLASP PowerPoint Presentation: Most common for anterior anchorage. Single arrowhead between CI with wire following the gingival margin. PowerPoint Presentation: Advantages of southend clasp: Advantages of southend clasp Unobtrusive. Good retention. Even be used if Incisors are proclined. TRIANGULAR CLASP: TRIANGULAR CLASP PowerPoint Presentation: Also called as MODIFIED ZIMMERMANS CLASP. Excellent retention by the single arrowhead in the interproximal area. Open end towards the occlusal. Can engage elastics. 0.7mm wire PowerPoint Presentation: Advantages of triangular clasp: Advantages of triangular clasp Easy to fabricate. Excellent retention. Pre fabricated available. Elastics can be engaged. Disadvantages of triangular clasp: Disadvantages of triangular clasp Not useful if adjacent tooth is absent. Used as secondary or additional retention. BALL END CLASP: BALL END CLASP PowerPoint Presentation: Action and location similar to triangular clasp. Prefabricated available. Can be made by adding solder to end of a wire. PowerPoint Presentation: Advantages of BALL END CLASP: Advantages of BALL END CLASP Easy to fabricate. Single occlusal interference. Less gingival irritation. Easy to replace. Disadvantages of BALL END CLASP: Disadvantages of BALL END CLASP Short arm makes adjustment difficult. Can not be used for primary retention. Cannot be used in absence of adjacent tooth. SCHWARZ CLASP: SCHWARZ CLASP PowerPoint Presentation: Also called as ARROWHEAD CLASP. A.M. Schwarz 1935. Mesial and distal undercuts of the teeth. PowerPoint Presentation: Advantages of SCHWARZ CLASP: Advantages of SCHWARZ CLASP Reliable retention. Does not interfere in posterior occlusion. More wire hence more flexible. More easy to adjust. Enhances eruption. Disadvantages of SCHWARZ CLASP: Disadvantages of SCHWARZ CLASP Difficult to fabricate. Needs special plier. Irritates soft tissue. Tends to separate teeth. Is bulky hence less patient compliance. CROZAT CLASP: CROZAT CLASP PowerPoint Presentation: Crozat in 1920 Along with the u clasp a stright wire is soldered on the base (Cresent). Strong retention is possible PowerPoint Presentation: ADAMS CLASP: ADAMS CLASP PowerPoint Presentation: 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. PowerPoint Presentation: FABRICATION parts: parts BRIDGE 2 ARROWHEADS 2 TAG ARMS BRIDGE: BRIDGE Is 2/3 rd the mesio dital 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 45 o to the buccal surface of the tooth. Should be straight. Arrowheads: Arrowheads They should lie in the disto- and mesio buccal undercuts. Shaped according to the curve of the gum margins in the direction of the interdental papilla. Long enough to keep the bridge at a proper distance. Should not touch the adjacent teeth Tag arms: Tag arms Closely fitted to the contact points, down to the interdental embrasure. Space between the tag arms and palate for flow of acrylic. No sharp bends. Advantages of ADAMS CLASP: Advantages of ADAMS CLASP 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 variations are available. Disadvantages of ADAMS CLASP: Disadvantages of ADAMS CLASP 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. ADJUSTMENTS: ADJUSTMENTS NEAR THE ARROWHEADS ON THE OCCLUSAL CROSS OVER PowerPoint Presentation:  MODIFICATIONS Anterior adams: Anterior adams 0.6mm Also called double clasp. With distal extension/ traction hook: With distal extension/ traction hook To engage elastics Not given if sulcus is shallow. With eyelet: With eyelet With a soldered hook: With a soldered hook With a soldered tube: With a soldered tube With a single arrowhead: With a single arrowhead With accessory arrowhead: With accessory arrowhead Smart clasp: Smart clasp Delta clasp: Delta clasp PowerPoint Presentation: Thank You Leader in continuing dental education

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