Evaluation of the Anchorage Loss During En-masse Retraction in Orthodontic Patients With Maxillary Protrusion

Future University in Egypt

Status: Unknown

Conditions: Bimaxillary Protrusion

Treatments: Procedure: Power chain and Crimpable hook fro En-masse Retraction; Procedure: T-loop

Study type: Interventional

Funder types: Other

Identifiers

NCT04902456

FUE.REC (13)/7-2019

Details and patient eligibility

About

There is scarcity in literature regarding the effectiveness of friction and frictionless mechanics during ''En-masse retraction''technique on anchorage loss of posterior segment in orthodontic patients with maxillary protrusion. Moreover there is deficiency in studies measuring the patient pain and satisfaction regarding the different techniques of retraction.

The aim of the current study is to evaluate the effects of friction versus frictionless mechanics, implemented during "En-masse retraction", on anchorage loss. Additionally, assessment of both techniques regarding their rates, effects on root resorption as well as patient satisfaction.

Full description

One of the most common complaints of orthodontic patients is proclination of anterior teeth where there is an increase in facial convexity and as well as incompetent lips. Bimaxillary dentoalveolar protrusion and class II division I cases always have this appearance. Frequently this situation requires extraction of the first premolars followed by fixed orthodontic appliance for space closure and retraction of anterior teeth. Different techniques are used including "Two-step retraction" where canines are retracted as a first step followed by anterior four incisors as a second step and "En-masse retraction" where anterior teeth are retracted as one unit. However, the method of "En-masse retraction" is controversial - whether to use frictionless or friction mechanics.

Enrollment: 30 patients

Sex: All

Ages: 14 to 24 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. Orthodontic patients (both genders)
2. Age range (14-24)
3. Patients requiring 1st premolars extraction followed by ''En-masse retraction'' (Bimaxillary Protrusion or Class II division 1 cases).
4. Patients with fully erupted permanent teeth (not necessarily including the 3rd molar).
5. Cases requiring maximum anchorage during anterior segment retraction.
6. Cases with minimal crowding (2-3) mm

Exclusion criteria

1. Patients suffering from any systemic diseases interfering with tooth movement.
2. Patients with extracted or missing permanent teeth. (except for third molars).
3. Patients with badly decayed teeth.
4. Patients with any parafunctional habits (i.e. Bruxism, tongue thrusting, mouth breathing, etc....).
5. Patients with previous orthodontic treatment

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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30 participants in 2 patient groups

Power Chain and Crimpable hook for En-masse retraction

Experimental group

Description:

Retraction will start on a 0.017x0.025" Stainless Steel wire using elastomeric chain ( force applied will be 212 g per side ) extending between the crimpable hooks and the miniscrew

Treatment:

Procedure: Power chain and Crimpable hook fro En-masse Retraction

T-loop

Experimental group

Description:

Closing retraction T-loops will be fabricated using 0.017x0.025" TMA wire. The loop will be positioned halfway the extraction space and the canine.

Treatment:

Procedure: T-loop