Evaluation of Treatment Outcomes of Interceptive Orthodontic Intervention for Class Iii Malocclusion Using Inclined Plane Appliance Combined With Variable Bracket Placement

May 12, 2026 updated by: Can Tho University of Medicine and Pharmacy
Study Title: Evaluation of Treatment Outcomes of Interceptive Orthodontic Intervention for Class III Malocclusion Using Inclined Plane Appliance Combined With Variable Bracket Placement Objective: To evaluate the clinical and radiographic outcomes of interceptive orthodontic treatment for skeletal Class III malocclusion in children Participants: Children aged 7 to 12 years diagnosed with skeletal Class III malocclusion (ANB < 0°, Wits < -2mm) and cervical vertebral maturation stages CS1, CS2, or CS3, treated at the Ho Chi Minh City Hospital of Odonto-Stomatology from 2025 to 2026 Methodology: This is a descriptive study with a non-controlled clinical intervention The treatment involves the application of a fixed inclined plane appliance on the mandibular teeth combined with variable bracket placement (bonded at a 180-degree rotation) on the maxillary anterior teeth to promote the forward movement of the upper incisors and stimulate maxillary alveolar bone growth Evaluation: Treatment efficacy is assessed after 6 months by comparing skeletal, dental, and soft tissue changes using standardized lateral cephalometric radiographs and Cone Beam Computed Tomography (CBCT) Success is defined by achieving a positive overjet (≥2mm), overbite (≥2mm), and an Angle Class I molar relationship

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

36

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Vietnam
      • Ho Chi Minh City, Vietnam
        • Department of Orthodontics, Ho Chi Minh City Dental Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Age: Patients between 7 and 12 years old
  • Skeletal Maturity: Cervical vertebral maturation (CVM) stages CS1, CS2, or CS3
  • Diagnosis: Diagnosed with skeletal Class III malocclusion on lateral cephalometric radiographs, characterized by an ANB angle < 0° and a Wits appraisal < -2mm
  • Patients and their legal guardians provide informed consent to participate in the study

Exclusion Criteria:

  • Dental Characteristics: Absence of anterior crossbite
  • Eruption Status: Permanent maxillary central incisors have not yet erupted
  • Molar Relationship: Molar relationship is not Class III according to Edward H. Angle's classification
  • Skeletal/Growth Issues: Excessive mandibular growth
  • Congenital Conditions: Congenitally missing maxillary first molars or presence of cleft lip and/or palate

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Inclined Plane and Variable Bracket placement group
Other: Inclined Plane Appliance Combined With Variable Bracket Placement

The treatment involves a combination of a fixed inclined plane appliance on the mandibular anterior teeth and variable bracket placement (brackets bonded with a 180-degree rotation) on the maxillary incisors

. This protocol aims to promote forward maxillary growth and improve the dental relationship

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Treatment success of interceptive orthodontic intervention for skeletal Class III malocclusion
Time Frame: 6 months after the start of the intervention

Evaluation of treatment success based on clinical and radiographic criteria. Success is defined as achieving:

Positive overjet (OJ ≥ 2mm)

. Positive overbite (OB ≥ 2mm)

. Angle Class I molar relationship

. The assessment includes measuring changes in skeletal, dental, and soft tissue parameters using standardized lateral cephalometric radiographs and Cone Beam Computed Tomography (CBCT)
6 months after the start of the intervention

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Can Tho University of Medicine and Pharmacy

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

July 20, 2025

Primary Completion (Actual)

April 20, 2026

Study Completion (Actual)

April 20, 2026

Study Registration Dates

First Submitted

May 6, 2026

First Submitted That Met QC Criteria

May 6, 2026

First Posted (Actual)

May 12, 2026

Study Record Updates

Last Update Posted (Actual)

May 13, 2026

Last Update Submitted That Met QC Criteria

May 12, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Prof. Le Nguyen Lam CTUMP

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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