Evaluation of a Novel Lip Bumper With Integrated Distal Shoe Appliance in Preventing Second Molar Impaction in Children With Anterior Deep Bite

Dar Al Uloom University

Status: Begins enrollment this month

Conditions: Orthodontics; Bite

Treatments: Device: Conventional Lip Bumper; Device: Lip Bumper with Integrated Distal Shoe

Study type: Interventional

Funder types: Other

Identifiers

NCT07015385

33-06-2025

Details and patient eligibility

About

The goal of this clinical trial is to evaluate the effectiveness of a novel lip bumper with an integrated distal shoe in preventing second molar impaction in children aged 8-10 years with anterior open bite during the mixed dentition stage.

The main questions it aims to answer are:

• Does the integrated distal shoe significantly reduce the risk of second molar impaction compared to conventional lip bumpers?
• Does the appliance improve anterior open bite correction and influence lower incisor inclination?

Researchers will compare Group I (lip bumper with distal shoe) to Group II (conventional lip bumper) to see if the modified appliance prevents mesial drift of first molars and improves eruption outcomes of second molars.

Participants will:

• Undergo initial records including panoramic and cephalometric radiographs, study models, and intraoral photos
• Be fitted with one of the two appliances and followed up every 6 weeks over a 12-month period
• Receive radiographic and clinical evaluation of second molar eruption
• Complete assessments related to overbite changes, incisor inclination, comfort, and compliance This trial seeks to inform early orthodontic protocols and may offer a dual-function solution for both molar guidance and open bite correction.

Full description

This clinical research study is focused on improving early orthodontic care for children who have an anterior deep bite-a condition where the upper teeth excessively overlap the lower front teeth-and are at risk of second molar impaction, a complication where the posterior teeth do not emerge properly. Left untreated, these issues can lead to long-term dental problems including poor bite alignment, crowding, or the need for surgical intervention.

Orthodontists often use a device called a lip bumper to reduce pressure from the lips on the lower front teeth, making room for crowded teeth and promoting healthy jaw development. However, a well-known downside of using a lip bumper-especially in young children-is that it can cause the first molars to drift forward. This forward movement can block the path for the second molars, increasing the risk that they will not erupt normally.

This study introduces a novel orthodontic appliance that aims to solve both problems at once. The new device combines the benefits of a traditional lip bumper with a "distal shoe"-a small guiding component that helps maintain proper space for the second molars to erupt. By doing so, it seeks not only to correct deep bite problems but also to prevent the common and serious issue of molar impaction.

The study will involve children between the ages of 8 and 10, a key stage of dental development. Participants will receive either the new dual-purpose device or a standard lip bumper and will be monitored over the course of a year. Throughout this period, researchers will examine how the teeth are moving, whether the posterior molars are erupting properly, and how well the deep bite is improving.

In addition to clinical evaluations, the study will gather feedback from children and their parents about comfort, ease of use, and any issues related to the appliance. Understanding patient experience is a vital part of assessing whether this new approach can be widely recommended in pediatric dental care.

Ultimately, this research aims to offer a more comprehensive and preventive solution for young patients undergoing early orthodontic treatment. If the new appliance proves effective, it could significantly reduce the need for more complex procedures later in life and promote better long-term dental health.

Ethical safeguards, including informed consent from parents and assent from participating children, are in place to ensure safety and understanding. The study has received institutional ethics approval and will be conducted under regular clinical monitoring.

Enrollment: 40 estimated patients

Sex: All

Ages: 8 to 11 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age between 8 and 11 years
• In mixed dentition stage (presence of permanent first molars and incisors; unerupted second molars)
• Presence of an anterior deep bite of ≥ 2 mm (measured vertically between upper and lower incisors)
• Class I or mild Class II malocclusion
• Good general health with no systemic conditions that may affect dental development or treatment
• Written informed consent obtained from the parent or legal guardian and assent from the child

Exclusion criteria

• History of previous orthodontic treatment
• Presence of craniofacial anomalies (e.g., cleft lip/palate) or syndromic conditions
• Diagnosis of systemic diseases that affect bone metabolism or craniofacial growth (e.g., juvenile rheumatoid arthritis, osteogenesis imperfecta)
• Evidence of poor oral hygiene or active caries requiring urgent dental care
• Use of any medication known to affect dental development (e.g., long-term corticosteroids, antiepileptics)
• Behavioral or developmental disorders that would preclude cooperation with appliance wear or study procedures

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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40 participants in 2 patient groups

Lip Bumper with Integrated Distal Shoe

Experimental group

Description:

Participants in this group will receive a novel orthodontic appliance that combines a traditional lip bumper with an integrated distal shoe. The appliance is designed to prevent mesial migration of the first molars and guide proper eruption of the second permanent molars. It also functions to relieve anterior deep bite by reducing lip pressure and promoting vertical and sagittal arch development. The appliance will be worn continuously for a period of 12 months with follow-up visits every 6 weeks for adjustments and monitoring.

Treatment:

Device: Lip Bumper with Integrated Distal Shoe

Conventional Lip Bumper

Active Comparator group

Description:

Participants in this group will receive a standard lip bumper appliance, commonly used in interceptive orthodontics to relieve lower arch crowding and eliminate lip pressure. This appliance does not include any mechanism to prevent mesial drift of the first molars or guide the eruption path of second molars. It will be used in the same time frame and follow-up schedule as the experimental group to allow direct comparison of outcomes.

Treatment:

Device: Conventional Lip Bumper