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Components of removable appliances 2 /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078


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  • 1. Removable orthodontic appliances • Active components * Springs i) Finger spring:-most important removable orthodontic appliances. -used for mesiodistal movement of the teeth. www.indiandentalacademy.com
  • 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 3. ii) Z spring:It is used for labial movement of incisors & correction of minor rotations. iii) T spring:It is used for the buccal movements of the premolars & canine. www.indiandentalacademy.com
  • 4. iv) Mattress spring:used for the correction of labial movement of the teeth in crossbite where sufficient space available for tooth movement. v) Helical coil spring:used to regain lost extraction space. www.indiandentalacademy.com
  • 5. vi) Coffin spring:Introduced by WALTER COFFIN in 1881. It is an omega shaped spring which helps to bring about arch expansion. www.indiandentalacademy.com
  • 6. vii) Canine retractors:#Buccal self supported canine – → It is made up of 0.7mm wire. It consists of active arm, helix of 3mm diameter & a retentive arm. Coil is placed distal to long axis of canine. → indicated in case where canine is buccally place & placed high in vestibule. www.indiandentalacademy.com
  • 7. #Palatal canine retractor:→Made up of 0.6mm stainless steel wire. It consists of active arm, helix coil,& a guiding arm. →It is indicated in case of palatally placed canine which required retraction. www.indiandentalacademy.com
  • 8. #Helical canine retractor:→Also called reverse loop canine retractor. Made up of 0.6mm wire. →It consist of active arm, retentive arm & coil of 3mm of diameter. →Activation done either by opening the coil by 2mm or by cutting 2mm of free end & readapt it around the canine. www.indiandentalacademy.com
  • 9. # U loop canine retractor:→Made up of 0.6-0.7mm round stainless steel wire.It consists of U loop, active arm & retentive arm. →U loop placed 2-3mm below the cervical margin. →It is used when minimum retraction (12mm)required. → It is easy in fabrication & less bulky. www.indiandentalacademy.com
  • 10. • Bows:i)Short labial bow:→Made up of 0.7mm round stainless steel wire.It is constructed in such a way that the bow contacts the most prominent labial surfaces of anterior teeth. →It is used for retention purpose as well as minor overjet reduction & anterior space closure. www.indiandentalacademy.com
  • 11. ii) Long labial bow:→It is just the modification of short labial bow. It extends from first premolar to first premolar of opposite side. iii)Split labial bow :→Modification of short labial bow. It is split in the middle.Effective in anterior retraction & closure of midline diastema. www.indiandentalacademy.com
  • 12. iv)Robert’s retractor:Made up of 0.5mm wire.It extends from labial surface of canine to canine instead of a regular loop it incorporates a 3mm internal diameter helix at the base of the loop.The distal arm of the loops are supported in softened stainless steel tubes of 0.5mm internal diameter. www.indiandentalacademy.com
  • 13. v) Reverse labial bow It’s the modification of conventional bow. In this there is a U loop & activation of the applianceis done by opening the loop. vi) Mills retractor:It’s also modification of conventional bow.It is used in patients with increased overjet.But due to it’s complex design & poor patient complience it is not widely used. www.indiandentalacademy.com
  • 14. vii)High labial bow with apron spring:It extends high in the vestibule. It is made up of thicker gauge wire & onto which thinner gauge of wire of 0.4mm wire is attached for the retraction of one or more upper anterior teeth. viii) Fitted labial bow:It adapts the contours of the labial surface of the teeth & used for retention purpose. www.indiandentalacademy.com
  • 15. • Screw:It’s active component of the removal appliance.It is activated by the patient by using a key.Mainly it can bring about three types of movements-Expansion of arch. -Movement of teeth or group of teeth in buccal or labial direction. - Movement of teeth or group of teeth in mesial or distal direction. www.indiandentalacademy.com
  • 16. • Advantage of screw over the spring:1) Easier to manage. 2) Less chair side time required. 3) Fewer tendencies to get dislodged ideal tooth movement is achieved by turning the screw a quarter turn every 37 days. www.indiandentalacademy.com
  • 17. • Elastics:-seldom used . -generally used for anterior retraction with labial bow. -Advantage :Aesthetically acceptable. -Disadvantage : can cause gingival trauma. :risk of arch form getting flattened. www.indiandentalacademy.com
  • 18. • Passive components Clasp: It is a retentive component of the removable appliance which helps in keeping the appliance in place & resist the displacement of the appliance. Mode of action: Clasps acts by engaging certain constricted areas of the teeth that are called undercuts www.indiandentalacademy.com
  • 19. • Two types of undercuts are found in natural dentition 1)Buccal & lingual undercuts“C”clasp & Jackson’s clasp. 2)Mesial & distal undercutsAdam’s clasp & Crozat clasp. • Requirement of the clasp 1)Should offer adequate retention. 2)Can use in partially & fully erupted teeth. 3)Easy to fabricate. 4)Should not apply active force. 5)Should not impinge soft tissue. 6)Should not interfere with normal occlusion. www.indiandentalacademy.com
  • 20. 1) Circumferential clasp: →also called Three quarter or C clasp. →Parts :-Circumferential retentive tip, interocclusal arm, retentive arm. →Advantages: i)Easy to fabricate. ii)Simple in design. →Disadvantage: Can not used in partially erupted teeth. www.indiandentalacademy.com
  • 21. 2)Jackson’s clasp: →Also called U clasp or Full clasp. →Advantage: -Easy to construct. -Offer adequate retention. →Disadvantage: -Inadequate retention in partially erupted teeth. www.indiandentalacademy.com
  • 22. 3) Adams clasp:-By C.P.Adams. -Also called as Liverpool clasp,Universal clasp,Modified arrowhead clasp. -Parts…Two arrowheads,Bridge,Two retentive arms. Advantagesi)Rigid & offer good retention. ii)Can used in partially erupted teeth. iii)Can give in permanent & deciduous teeth. www.indiandentalacademy.com
  • 23. • Modifications of Adams clasp:- www.indiandentalacademy.com
  • 24. 4)South end clasp-Used for retention purpose in anterior region. -The wire adapted on the cervical margin of both central incisors. 5)Triangular clasp-Small triangular shaped clasp between two adjacent posterior teeth & engages the proximal undercut. -Use: whenever additional retention needed. www.indiandentalacademy.com
  • 25. 6)Ball end claspThis appliance have a ball like structure on one end.This ball can be made with the help of silver solder. The ball engages the proximal undercut between two adjacent posterior teeth. Indication: Whenever additional retention is needed. www.indiandentalacademy.com
  • 26. 7)Crozat clasp-Resembles full clasp but an additional piece of wire soldered which engages in mesial & distal proximal undercut. 8)Schwartz clasp-Also called arrowhead clasp. -Engages in interproximal area between premolar & molar. -Provide adequate retention. www.indiandentalacademy.com
  • 27. • Disadvantage of Schwartz clasp:1)Need special arrowhead forming plier. 2)Occupies large amount of space in buccal vestibule. 3)Can injure inter dental soft tissue. 4)Difficult to fabricate & time consuming. www.indiandentalacademy.com
  • 28. • Base plate:-It is made up of cold cure acrylic resin. -The primary function of base plate is to incorporate all the components together as a functional unit. -Helps in anchoring the appliance in place. -Provide support to wire components. -Helps in distributing forces over a larger area. -It’s thickness should be 1.5-2 mm www.indiandentalacademy.com
  • 29. www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com