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NCT Number: NCT07096401

Efficacy of Aligners vs ABT and RCOS for Deep Bite Correction: CBCT Study

This prospective clinical trial aims to evaluate the efficacy of clear aligner therapy compared to two different treatment modalities - anterior bite turbos and reverse curve of Spee (RCOS) archwires - for the correction of dental deep bite cases. Deep bite malocclusion is characterized by excessive vertical overlap of the anterior teeth and often requires intrusion of anterior teeth and leveling of the curve of Spee.

In this study, 27 patients aged 16-30 years with an overbite ≥5 mm and no significant skeletal discrepancies will be randomly assigned into three equal groups: Group 1 (RCOS archwire), Group 2 (anterior bite turbos), and Group 3 (clear aligners).

Cone-beam computed tomography (CBCT) will be used to assess changes in overbite and alveolar bone height and thickness before and after treatment. The primary outcome is the efficacy of overbite correction, and the secondary outcome is the assessment of alveolar bone remodeling.

The study will be conducted at the Department of Orthodontics, Faculty of Dental Medicine, Al-Azhar University (Assiut Branch), and has been approved by the institutional ethical committee.

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Key information

Conditions

Deep Bite Malocclusion

Age range

16 year–30 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age between 16 and 30 years.

Overbite of 5 mm or more.

Full permanent dentition (excluding third molars).

Good oral hygiene.

No previous orthodontic or orthognathic treatment.

Exclusion criteria

  • Severe skeletal Class II or III requiring surgery.

Overjet greater than 6 mm.

Craniofacial anomalies.

Systemic diseases.

Treatment and study plan

Reverse Curve of Spee Archwire

Device

Orthodontic treatment using a 0.016 × 0.022 NiTi reverse curve of Spee archwire to correct deep bite through posterior extrusion and anterior intrusion.

Anterior Bite Turbos

Device

Orthodontic treatment using anterior bite turbos bonded to the palatal surfaces of the upper central incisors to promote posterior extrusion and correct deep bite.

Clear aligners

Device

Orthodontic treatment using clear aligner therapy designed for anterior intrusion and leveling of the curve of Spee to correct deep bite.

Primary outcomes

  1. Change in overbite

    Time frame: Baseline and 6 months after treatment start

    Mean change in overbite (in mm) measured using CBCT imaging

Sponsors and collaborators

Lead sponsor

Al-Azhar University

Other

Registry information

Official study title

The Efficacy of Aligner Therapy Versus Anterior Bite Turbos and Reverse Curve of Spee Archwires for Correction of Deep Bite Cases: A Cone-beam Computed Tomography Study

Acronym: DB-CBCT

Important dates

Study start
2025
Primary completion
2026
Study completion
2027
First posted
Jul 31, 2025
Registry last updated
Aug 3, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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