---
title: "Self-activated Leaf Expander Versus William's Expander in Expansion of Collapsed Mandibular Arch"
nct_id: NCT07480148
overall_status: ACTIVE_NOT_RECRUITING
phase: NA
sponsor: Al-Azhar University
study_type: INTERVENTIONAL
primary_condition: Mandibular Expansion
countries: Egypt
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT07480148.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT07480148"
ct_last_update_post_date: 2026-03-18
last_seen_at: "2026-05-12T06:44:21.884Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Self-activated Leaf Expander Versus William's Expander in Expansion of Collapsed Mandibular Arch

**Official Title:** Self-activated Leaf Expander Versus William's Expander in Expansion of Collapsed Mandibular Arch: A Prospective Clinical Trail

**NCT ID:** [NCT07480148](https://clinicaltrials.gov/study/NCT07480148)

## Key Facts

- **Status:** ACTIVE_NOT_RECRUITING
- **Phase:** NA
- **Study Type:** INTERVENTIONAL
- **Target Enrollment:** 16
- **Lead Sponsor:** Al-Azhar University
- **Conditions:** Mandibular Expansion
- **Start Date:** 2024-06-15
- **Completion Date:** 2026-11-30
- **CT.gov Last Update:** 2026-03-18

## Brief Summary

Self-activated leaf expander versus William's expander in expansion of collapsed mandibular arch

## Detailed Description

The current randomized clinical study will be directed to compare the selfactivated leaf expander to William's expander for the expansion of collapsed mandibular arch.

## Eligibility

- **Minimum age:** 12 Years
- **Maximum age:** 16 Years
- **Sex:** FEMALE
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* An age from 12-16 years.

  * Low to average facial vertical pattern.
  * A mild to moderate crowding in mandibular arch with reduced transverse dimension which require non extraction orthodontic approach.
  * Similar amount of crowding on each side of the mandibular arch.
  * No previous orthodontic treatment.
  * Good oral and general health.

Exclusion Criteria:

* Severe crowding.

  * Steep mandibular plane.
  * Asymmetric crowding on both sides of the arch.
  * Shifting of mandibular dental midline.
  * Impacted lower 2nd premolar.
```

## Arms

- **self activated leaf expander** (ACTIVE_COMPARATOR) — Eight patients will be treated by self-activated leaf expander that does not need activation by the patient.
- **william's expander** (ACTIVE_COMPARATOR) — Eight patients will be treated with William's expander, where the arms of expander will be placed parallel to the line of occlusion at the middle of lingual surface of the anterior teeth with two bands on lower permanent first molars.

## Interventions

- **self activated leaf expander** (DEVICE) — Eight patients will be treated by self-activated leaf expander that does not need activation by the patient.
- **williams's expander** (DEVICE) — Eight patients will be treated with William's expander, where the arms of expander will be placed parallel to the line of occlusion at the middle of lingual surface of the anterior teeth with two bands on lower permanent first molars.

## Primary Outcomes

- **Intercanine width** _(time frame: 6 months)_ — comparing the selfactivated leaf expander to William's expander for the expansion of collapsed lower arch by CBCT mandibular arch.

## Locations (1)

- Alazhar, Naşr, Egypt

## Recent Field Changes (last 30 days)

- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.phases` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.alazhar|naşr||egypt` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT07480148.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT07480148*  
*This page is a raw mirror with no AI summary, no editorial enrichment, and no Parkinson's-specific filtering.*