CLASPS 1 /fixed orthodontic courses by IDA

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Information about CLASPS 1 /fixed orthodontic courses by IDA
Education

Published on May 8, 2014

Author: indiandentalacademy

Source: authorstream.com

Clasps: Clasps www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com 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. www.indiandentalacademy.com PowerPoint Presentation: RETENTION :- is the means whereby the displacement of an appliance is resisted. www.indiandentalacademy.com 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. www.indiandentalacademy.com :  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. www.indiandentalacademy.com IDEAL REQUIREMENTS: IDEAL REQUIREMENTS Unobtrusive. Not impinge. Close contact to the tooth. Usable in both deciduous and permanent dentition. Adequate retention. www.indiandentalacademy.com 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. www.indiandentalacademy.com CLASSIFICATION: CLASSIFICATION A. Hand Made Machine Made. B. Single tag arm Double tag arm www.indiandentalacademy.com 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. www.indiandentalacademy.com CIRCUMFERENTIAL CLASP: CIRCUMFERENTIAL CLASP www.indiandentalacademy.com 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. www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com Advantages of C clasp: Advantages of C clasp Good retention. Easy to fabricate. Single occlusal crossover wire. Easy to replace. www.indiandentalacademy.com Disadvantages of C clasp: Disadvantages of C clasp Not on semi-erupted tooth. Decalcification of cervical margin. Gingival irritation. Plaque accumulation enhanced. Easily distort. www.indiandentalacademy.com JACKSONS CLASP: JACKSONS CLASP www.indiandentalacademy.com PowerPoint Presentation: V.H. Jackson 1906 Jacksons Clasp / Full Clasp / U Clasp. Both bucco-cervical and proximal undercuts. 0.7mm to 1mm. www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com Advantages: Advantages Simple design Adequate retention. www.indiandentalacademy.com Disadvantage: Disadvantage Not useful in partially erupted teeth. Difficult to adjust. Not on unfavorably inclined tooth. www.indiandentalacademy.com SOUTHEND CLASP: SOUTHEND CLASP www.indiandentalacademy.com PowerPoint Presentation: Most common for anterior anchorage. Single arrowhead between CI with wire following the gingival margin. www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com Advantages of southend clasp: Advantages of southend clasp Unobtrusive. Good retention. Even be used if Incisors are proclined. www.indiandentalacademy.com TRIANGULAR CLASP: TRIANGULAR CLASP www.indiandentalacademy.com 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 www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com Advantages of triangular clasp: Advantages of triangular clasp Easy to fabricate. Excellent retention. Pre fabricated available. Elastics can be engaged. www.indiandentalacademy.com Disadvantages of triangular clasp: Disadvantages of triangular clasp Not useful if adjacent tooth is absent. Used as secondary or additional retention. www.indiandentalacademy.com BALL END CLASP: BALL END CLASP www.indiandentalacademy.com PowerPoint Presentation: Action and location similar to triangular clasp. Prefabricated available. Can be made by adding solder to end of a wire. www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com Advantages of BALL END CLASP: Advantages of BALL END CLASP Easy to fabricate. Single occlusal interference. Less gingival irritation. Easy to replace. www.indiandentalacademy.com 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. www.indiandentalacademy.com SCHWARZ CLASP: SCHWARZ CLASP www.indiandentalacademy.com PowerPoint Presentation: Also called as ARROWHEAD CLASP. A.M. Schwarz 1935. Mesial and distal undercuts of the teeth. www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com 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. www.indiandentalacademy.com 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. www.indiandentalacademy.com CROZAT CLASP: CROZAT CLASP www.indiandentalacademy.com PowerPoint Presentation: Crozat in 1920 Along with the u clasp a stright wire is soldered on the base (Cresent). Strong retention is possible www.indiandentalacademy.com PowerPoint Presentation: www.indiandentalacademy.com ADAMS CLASP: ADAMS CLASP www.indiandentalacademy.com 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. www.indiandentalacademy.com PowerPoint Presentation: FABRICATION www.indiandentalacademy.com parts: parts BRIDGE 2 ARROWHEADS 2 TAG ARMS www.indiandentalacademy.com 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. www.indiandentalacademy.com 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 www.indiandentalacademy.com 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. www.indiandentalacademy.com 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. www.indiandentalacademy.com 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. www.indiandentalacademy.com ADJUSTMENTS: ADJUSTMENTS NEAR THE ARROWHEADS ON THE OCCLUSAL CROSS OVER www.indiandentalacademy.com PowerPoint Presentation:  MODIFICATIONS www.indiandentalacademy.com Anterior adams: Anterior adams 0.6mm Also called double clasp. www.indiandentalacademy.com With distal extension/ traction hook: With distal extension/ traction hook To engage elastics Not given if sulcus is shallow. www.indiandentalacademy.com With eyelet: With eyelet www.indiandentalacademy.com With a soldered hook: With a soldered hook www.indiandentalacademy.com With a soldered tube: With a soldered tube www.indiandentalacademy.com With a single arrowhead: With a single arrowhead www.indiandentalacademy.com With accessory arrowhead: With accessory arrowhead www.indiandentalacademy.com Smart clasp: Smart clasp www.indiandentalacademy.com Delta clasp: Delta clasp www.indiandentalacademy.com PowerPoint Presentation: Thank You www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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