Rapid Correction Of Rotation With Modified Rotation Tie

“Tooth rotation, is defined as mesiolingual or distolingual intraalveolar displacement of the tooth around its longitudinal axis”.
Number of factors are involved in the rotation of teeth like space inadequacy, abnormal tooth eruption sequence, and undesirable forces exerted by the tongue and lips or any above combination. Biomechanical principles involve application of single or couple of force for correction of rotation. Rotated teeth can be corrected by removable, semifixed or fixed appliance depending upon the severity of rotation. Removable appliance containing z spring along with labial bow and semifixed (whip appliance) can treat mild rotations. Fixed appliance is a treatment of choice for severe rotations of teeth.

Correction Of Rotation With Modified Rotation Tie


Derotation can be done by number of ways with fixed appliances

1. By engaging NiTi archwire into bracket slot. Because of its superelastic nature and creating 1st order couple as it regains its original shape.
2. Offcentered brackets bring slight over correction of rotations. It exerts greater pull force on the side having maximum rotation. placement of offcentered bracket on rotated right central incisor.
3. Rotation wedge brings over correction by exerting push force. Figure 2 showing placement of elastic module on distal tie wing of mesiolabially rotated both lower lateral incisor and mesial tie wing of distolabially rotated lower left canine.
4. Palatal/lingual attachments helps in engaging force from lingual side, thus couple force can be applied (from labially/ buccally placed bracket and lingual attachments).
5. Ligature rotation tie onto the arch wire acts by applying a couple of force to bring derotation.It is stretched from one side of the tooth needing rotation across its lingual surface and passed interproximaly and finally hooked onto the wire. Elastic thread can also be used in the same way.

6. Rotation spring can also be used in Beggs technique. Read more.............

Comments

Post a Comment

Popular posts from this blog

Harvesting Free Palatal Masticatory Mucosal Graft Using 3a Mucotome

Image
The technique of free autogenous gingival grafting (FGG) has undergone little modification since its introduction by Bjorn in Scandinavia in 1963 and by King and Pennel inthe United States in 1964. The technique is widely used to treat a variety of mucogingival problems such as insufficient or lack of attached gingiva, the presence of high frenum attachments, shallow fornix and denuded roots following gingival recession.  FGG can be procured from donor site using scalpels, gingivectomy knife or palatal shaving knife (Paquette knife). The donor site is frequently the palate, although the use of edentulous ridge areas, tuberosity and attached gingiva has also been described. Scalpel is most commonly used and conventional method for procuring gingival auto grafts. Gingivectomy knife, although not commonly used, also works on similar principle. Since the scalpel blade is straight and stiff and the palate is curved, repeated incisions to release the graft from underlying conn...
Read more

Indications for Orthognathic Surgery

Image
Orthognathic surgery (OS) is a surgical intervention that alters relationships of the jaws and dental arches. The treatment involves a combination of orthodontics and maxillofacial surgery.  Orthognathic Surgery It is used to correct dentofacial deformities that cannot be treated with acceptable results by conventional orthodontics. The first description of a surgical intervention to correct a malocclusion was by Hullihen in 1849. The most frequently used surgical procedures for correcting the relationship of the jaws are Le Fort I osteotomy and sagittal ramus split osteotomy. Also often used are vertical ramus osteotomy, inverted L osteotomy, and variations and combinations of the above. Read More>>>>>>
Read more

Dental Ailments may be risky for Cardiac Patients

Image
Patients that are suffering from cardiac t=disorders are susceptible to physical and mental stress. Dental ailments add to the stress further as these patients are unable to cope with the pain due to cardiac disorders. These patients may encounter medical emergencies in case of dental disorders and they may demand multi disciplinary approach to achieve the success. Additionally, the results of cardiac surgery may suffer if the oral cavity is not maintained well since there is always a fear of infection affecting the heart from the oral cavity. Hence, the cardiac surgeon has to refer surgical patients to a dentist for oral prophylaxis and to treat any oral infections before cardiac surgery to prevent infective endocarditis. PDF LINK
Read more