Retentive Capacity of Bonded Retainer Vs Vacuum-formed and Combined Bonded-vacuum Retainers

Summary

The main goal is to test the differences between the retentive capacity of fixed retainer, vacuum-formed retainer \& combination of both; and recommend the most effective protocol for retention of lower incisors crowding treated by non-extraction treatment plan

The main question is: In patients with lower incisors crowding treated by non-extraction treatment plans, what is the difference in retentive capacity between fixed retainer, vacuum formed retainer and combined bonded and vacuum retainers in maintaining corrected lower anterior segment crowding? After enrolment, each participant will have the orthodontic appliance debonded, the adhesive remnant removed and the enamel surface polished. An alginate impression will be taken to be poured into a study model which will be scanned to obtain STL files for digital models. All patients will have periodontal charting and probing depths recorded for the lower anterior segment. According to the randomization, each patient will be assigned to a group to receive the retainer. All patients will be called for follow-up after 1 week, 1 and 3 months.

Conditions

• Orthodontic Retainer
• Fixed Orthodontic Retainer
• Orthodontic Relapse
• Essix Retainer
• Vacuum-formed Retainer
• Dual Retention Protocol

Interventions

DEVICE

Vacuum-formed retainer

* After patient finishes orthodontic treatment, the fixed orthodontic appliance will be debonded; finishing and polishing of the enamel surface will be done. * An alginate impression will be taken to be poured into a working model for fabrication of the Vacuum-formed retainer; 1mm Hard vacuum sheet will be used. * The retainer will be finished and delivered to the patient. * The patient will be instructed to wear the retainer night time only and to contact us if any damage occurred to the retainers for immediate replacement; and he will be supplied with a check list to evaluate the compliance and to calculate the wearing hours. * Another alginate impression will be taken for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0 (before wearing of the retainer).

DEVICE

Combined Vacuum-formed and Lingual bonded retainer from canine-to-canine.

* A multistrand rectangular stainless steel retainer wire will be bonded to the lingual surface of the lower anterior teeth, from the canine-to-canine bonded to all six anteriors; followed by an alginate impression; the impression will be poured into a working model for fabrication of the Vacuum-formed retainer; 1mm Hard vacuum sheet will be used \& it will be finished and delivered to the patient. * The patient will be instructed to wear the Vacuum retainer night time only and to contact us if any damage occurred to the retainers for immediate replacement or rebonding of the detached parts of the bonded retainer; and will be supplied with a check list to evaluate the compliance and to calculate the wearing hours. * Another alginate impression will be taken (with the bonded retainer in place) for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0.

DEVICE

Lingual bonded retainer from canine-to-canine

* After patient finishes orthodontic treatment, the fixed orthodontic appliance will be debonded; finishing and polishing of the enamel surface will be done. * A multistrand rectangular stainless steel retainer wire will be bonded to the lingual surface of the lower anterior teeth, from the canine-to-canine bonded to all six anteriors. * The patient will be instructed to contact us if any damage occurred to the retainers for immediate replacement or rebonding of the detached parts of the retainer. * An alginate impression will be taken (with the bonded retainer in place) for fabrication of the study model which will later be scanned to obtain the digital model at T0; and a periodontal chart will be filled to record the periodontal status at T0 (at the same visit of the delivery of the bonded retainer).

Sponsors & Collaborators

• Cairo University

  lead OTHER

Principal Investigators

• Hadeer A. ElBehery, Bachelor · Cairo University

• Fady H. Fahim, Ass Professor · Cairo University

• Sally M. Reyad, Lecturer · Cairo University

Study Design

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

SINGLE

Model

FACTORIAL

Eligibility

Min Age

18 Years

Max Age

35 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2023-09-29

Primary Completion

2024-08-31

Completion

2024-08-31

Countries

• Egypt

Study Locations