Effect of Modified Twin Block in Skeletal Class II Growing Females With Mandibular Deficiency

Cairo University30 enrolled

Overview

The aim of this study is to evaluate the treatment effects of conventional twin block appliance versus modified twin block appliance in the treatment of patients in growing stage having skeletal class II division 1 with mandibular deficiency.

in this randomized controlled trail there are 2 groups , the first group will receive modified twin block appliance ,in the second group will receive conventional twin block appliance . the follow up period will be 9 months till mandibular growth occur . the assessment will be through a questionnaire on the number of hours the appliance is worn each day , and another questionnaire assessing the difficulty of speech and aesthetics . Also by, photographs, x-rays and study models preoperative and post operative.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

Conditions

Class II Division 1 Malocclusion

Interventions

twin block applianceDEVICE

a functional appliance that enhances mandibular growth in growing patients made from vaccum sheets (esthetic)

modified twin block applianceDEVICE

a convetional twin block functional appliance that enhances mandibular growth in growing patients

Eligibility

Sex: FEMALEMin age: 9 YearsMax age: 12 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. Skeletal Class II relationship (ANB \> 4°). 2. Mandibular retrognathy (SNB \< 78°). 3. Overjet ≥ 5 mm. 4. Minimal crowding in dental arches (≤4 mm). 5. Class II molar relation. 6. Growing female patients. 7. Patients with CMV3 maturation stage of the cervical verbrae. Exclusion Criteria: 1. No history of orthodontic treatment either prior to or during functional Appliance therapy. 2. Posterior cross bites or severe maxillary transverse deficiency. 3. Severe facial asymmetry determined by clinical or radiographical examination. 4. Poor oral hygiene. 5. Systemic diseases that may affect the orthodontic treatment results. 6. Patients past their peak growth spurt.

Outcomes

Primary Outcomes

enhancing mandibular skeletal growth

it will be assessed by measuring the incremental growth by quick ceph (mm)

Time frame: 9 months

Secondary Outcomes

dentoalveolar changes

quick ceph (mm)

Time frame: 9 months

Improvement of soft tissue profile

quick ceph (mm)

Time frame: 9 months

Patient's compliance

table chart (no of hours/day)

Time frame: 9 months

Data from ClinicalTrials.gov

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