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Fixed Versus Conventional Twin Block Appliances for Skeletal Class II Malocclusion

NCT07687927 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 20

Last updated 2026-07-07

No results posted yet for this study

Summary

This study compares two types of dental appliances a fixed Twin Block appliance and a conventional (removable) Twin Block appliance used to treat a bite problem called skeletal Class II malocclusion in growing children and teenagers. In this condition, the lower jaw is positioned further back than the upper jaw. Both appliance types work by guiding the lower jaw forward during growth. The study uses 3D imaging (cone beam computed tomography, or CBCT) before and after treatment to measure how each appliance affects the bones of the jaw, the teeth, the soft tissue profile of the face, and the jaw joint (temporomandibular joint). The goal is to determine whether the fixed or the conventional version of the appliance produces better treatment outcomes.

Conditions

  • Skeletal Class II Malocclusion
  • Mandibular Retrognathia

Interventions

DEVICE

Conventional Twin Block Appliance

A removable functional appliance consisting of upper and lower acrylic occlusal bite blocks used to advance the mandible and correct skeletal class II malocclusion in growing patients

Sponsors & Collaborators

  • Al-Azhar University

    lead OTHER

Study Design

Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
11 Years
Max Age
15 Years
Sex
MALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2023-11-08
Primary Completion
2025-12-23
Completion
2025-12-24

Countries

  • Egypt

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07687927 on ClinicalTrials.gov