A prospective study of orthodontic retention outcomes with different retention strategies

Not Applicable

• Conditions: retention outcomes post orthodontic treatment as affected by different retainer types; retention outcomes post orthodontic treatment as affected by wisdom tooth extraction after completion of orthodontic treatment; Oral and Gastrointestinal - Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon

• Registration Number: ACTRN12612000670875
• Lead Sponsor: Australian Society of Orthodontists Foundation for Research and Education

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2012-06-22
• Last Update Posted: 13 January 2020

Recruitment & Eligibility

• Status: ot yet recruiting
• Sex: All
• Target Recruitment: 72

Inclusion Criteria

1.subject to be under the age of 17 years old at the end of treatment
2.subject diagnosed as not having enough space for lower third molar teeth (assessment of this will be made using a late treatment OPG and the Space Width Ratio will be less than 0.8). If the OPG indicates that the teeth are horizontally impacted and therefore at a risk of being closely involved with the inferior dental canal and its contents then the patient would be advised not to participate in the study and to seek early removal of the 8s.

3.subject has a continuous (no unclosed extraction spaces) natural dentition including second molars in occlusion with no retained primary (baby) teeth or complex restorations (crowns, bridges or implant supported crowns or bridges);
4.subject has undergone full fixed orthodontics with or without other phases or adjunctive treatments such as rapid maxillary expansion or extractions; (however no orthognathic surgery cases will be included to avoid the compounding factor of surgical relapse);
5.subject has pre-treatment study models and OPG available (these are standard pre-treatment orthodontic records);
6.subject has end-of-treatment study models, and late treatment OPG (these are standard end-of-treatment orthodontic records);
7.subject agrees, with consent of parent/guardian, to have impressions for study models not only at end-of-treatment, but also at 1 year post-treatment and 3 years post-treatment;
8.subject agrees, with consent of parent/guardian, to undergo oral examination and to complete a patient satisfaction survey at 3 months, 1 year and at 3 years;
9.subject and parent/guardian consents to a randomly assigned retention protocol

Exclusion Criteria

1. over the age of 17 years
2. Has sufficient space for lower third molar teeth
3. Patient has unclosed extraction spaces
4. Patient has undergone orthognathic surgery
5. Patient does not have complete end of treatment records.
6. Patient does not consent to treatment
7. Patient is not available for review at the time points

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
% with acceptable PAR score. An acceptable PAR score being one which demonstrates that there has not been relapse.[T0 is before treatment<br>T1 is after randomisation and therefore at point of allocation to trial (immediately post treatment)<br>T2 is one year after allocation to trial, one year post treatment.<br>T3 is three years after allocation to trial, 3 years after end of treatment.]

Secondary Outcome Measures

Name	Time	Method
Patient preference for retainer, as assessed by a questionnaire.<br>This particular questionnaire has not been validated[3 months after treatment<br>1 year after end of treatment<br>3 years after end of treatment]