Atlas of orthodontic appliances fixed and removable free download

Removable orthodontic appliance Download Now Download Download to read offline. Orthodontic appliances. Removable Orthodontic Appliances. Evolution of Functional Appliances. Activator and its modifications. Basic removable appliance design. Functional appliances.

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Siddhi Prabhudessai. Seun Ejiade. Ln P Himam Bathusha. Shyamali Mahato. Veihrii Prou. Atheek AF. Anshu Saraf. Akarshita Rastogi. Naveen Dr , Dental Surgeon. Show More. Views Total views. Actions Shares. No notes for slide. Removable orthodontic appliance 1. Removable orthodontic appliance 2. Definition Removable orthodontics appliances refers to those devices that can be inserted into and removed from the oral cavity by the patient will. Historically, the development of the fixed appliances preceded that of removable appliances.

He also used a removable plate quite similar to the one used nowadays. Further evolution of the removable appliances was linked to the development of the process of rubber vulcanization.

If one considers the factors of risk and the relationship between work volume and effect, removable appliances deserve preference. Components of removable appliances 9. Retentive component They are the component that help in keeping the appliance in place and resist displacement. Adequate retention of a removable appliance is achieved by incorporating certain wire component that engage undercuts on the teeth.

These wire components that aid in retention of a removable appliance are called clasp. Mode of action of clasp clasps act by engaging certain constricted areas of the teeth that are called undercuts.

When clasps are fibricated the wire is made to engage these undercuts so that there displacement is prevented. Requirement of ideal clasp 1. It should offer adequate retention. It should permit usage in both fully erupted as well as partially erupted teeth. They should not themselves apply any active force that would bring about undesired tooth movement of the anchorage teeth.

It should be easy to fabricate. It should not impinge on the soft tissues. It should not interfere with normal occlusion. Early retraction of maxillary anterior tooth will further cause extrusion and relapse 3 Activated labial bow appliance without sufficient relief of acrylic base plate for incisor retraction is a common mistake. The palatal acrylic is so trimmed that it would allow greater movement of incisors at the cingulum , thereby minimising tipping at incisal edge 4 The conventional labial bow should uniformly touches labial surface of all the teeth being retracted.

To retract the single malpositioned incisor , labial bow activation should be minimal and gentle. It may require to be gently activated in a distal direction if the anchorage loss is anticipated. They are simple clasp that are designed to engage the bucco-cervical undercut This clasp cannot be used in partially erupted teeth where the cervical undercut is not avilable for clasp fabrication.

Advantages :- Simple design and fabrication Disadvantage :- It cannot be used in partially erupted teeth wherein cervical undercut is not avilable fo clasp fabrication The clasp engage the bucco- cervical undercut and also the mesial as well as distal proximal undrecuts. The clasp is constructed using 0. Adams clasp is made up of three parts a two arrowheads b bridge c two retentive arms Two arrow heads engage the mesial and the distal proximal undercuts.

The arrow heads are connected to each other by a bridge that is at 45 degree to the long axis of the root Steps in fabrication of adams clasp Modifications in adams clasp a Adams with single arrowhead : This type are indicated in partially erupted tooth ,which usually is last erupted molar.

The single arrow head is made to engage the mesio-proximal undercut of the last erupted molar. The bridge is modified to encircle the tooth distally and ends on the palatal aspect as a retentive arms. These hooks are useful in engaging elastics. It also help in engaging elastics. They can be used in engaging elastic. Southend clasp Southend clasp is used when retention in the anterior region is required. The wire is adapted along the cervical margin of both the central incisors.

The distal ends are carried over the occlusal embrasures to end as retentive arms on the palatal side. Traingular clasp They are small traingular shaped clasp that are used between two adjacent posterior teeth.

Thus they engage the proximal undercuts of two adjacent teeth. These clasp are indicated when additional retention is required. Schwarz clasp Schwarz clasp or arowhead clasp can be said to be the predecessor of the adam clasp. The clasp is designed in such a way that a number of arrowhead engage the interproximal undercuts between the molar and between the premolars and molars. This clasp is not used routenly due to numbers of drawbacks.

Crozat clasp This clasp resemble a full clasp but has but has an additional piece of wire soldered which engages into the mesial and distal proximal undercuts. The active component includes : a bows b springs c screws d elastics Types of the bows : a Short labial bows : They are constructed using 0. It consist of bow that make contact with the most prominent labial teeth and two U loops that ends as retentive arms distal to the canine.

The short labial bow is activated by compressing the U loop. Indication : Minor overjet reduction and anterior space closure. The distal arms of the U loops are adapted over the occlusal embrasure between the two premolars to get embedded in the acrylic plate. This result in two seprate buccal arms having a U loop each.

This type of labial bow show the increase flexiblity as compared to the conventional short labial bows. This type of labial bow is used for anterior retraction. The split bow is activated by compressing the U loop mm at a time. Here the U loop is placed distal to the canine and the free end of the U loop are adapted occlusally between the first premolar and canine.

Activation is done in two step. First the U-loop is opened resulting in lowering of the labial bow in incisor region. The compensatory bend is then made at the base of U loop to maintain proper level of the bow. Apron spring made of 0. Author : K. Isaacson J. Muir R. Zygomatic Implants Optimization and Innovation August 15, Zero Bone Loss Concepts August 15, Leave a Comment Cancel Reply Your email address will not be published.

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