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

Effect of Modified Twin Block in Skeletal Class II Growing Females With Mandibular Deficiency: A Randomized Controlled Trial

Status

UNKNOWN

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03635463

Enrollment

Registered

2018-08-17

Start date

2018-12-31

Completion date

2019-12-31

Last updated

2018-12-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Class II Division 1 Malocclusion

Brief summary

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.

Detailed description

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.

Interventions

DEVICEtwin block appliance

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

DEVICEmodified twin block appliance

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

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

SINGLE (Subject)

Masking description

double blinded( participant and outcome assessor)

Eligibility

Sex/Gender

FEMALE

Age

9 Years to 12 Years

Healthy volunteers

Yes

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.

Design outcomes

Primary

Measure	Time frame	Description
enhancing mandibular skeletal growth	9 months	it will be assessed by measuring the incremental growth by quick ceph (mm)

Secondary

Measure	Time frame	Description
dentoalveolar changes	9 months	quick ceph (mm)
Improvement of soft tissue profile	9 months	quick ceph (mm)
Patient's compliance	9 months	table chart (no of hours/day)

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026