Orthodontic Relapse
Conditions
Keywords
retention wire, fixed retainer, orthodontic therapy
Brief summary
Objective is to assess changes of dentition and periodontium, and hygiene in retention after the end of the active phase of orthodontic treatment, and relationship with gender, type of retention appliance, pre-therapeutic condition of dentition and duration of active phase of treatment.
Detailed description
A total of 152 subjects will be recruited and randomly assigned into three groups. First group will have a square 8-stranded 0.673x0.268 mm retainer wire bonded in mandibular teeth after completing the active phase of comprehensive orthodontic treatment with fixed appliances. Retainer will be bonded on lingual site canine to canine on each tooth. Second group will have a round 6-stranded 0.40 mm retainer in mandible. Third group will be without fixed retainer, only with thermoplastic vacuum-formed removable Essix retainer in mandible. Subjects will be examined before orthodontic treatment (T0), upon completion of treatment (T1), six months in retention (T2), two years (T3) and three years in retention (T4). Changes in intercanine width, relapse (unexpected tooth movements), retainer failure, accumulation of biofilm, calculus and gingivitis will be assessed.
Interventions
DEVICEfixed retainer
bonded lingual mandibular fixed retainer on frontal teeth 33-43
DEVICEremovable retainer
thermoplastic vacuum-formed removable mandibular retainer
Sponsors
University of Zagreb School of Dental Medicine, Zagreb, Croatia
University of Rijeka Faculty of Dental Medicine, Rijeka, Croatia
Poliklinika Orthonova
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Investigator)
Eligibility
Sex/Gender
ALL
Age
11 Years to 18 Years
Healthy volunteers
Yes
Inclusion criteria
finished orthodontic treatment, participants must have all permanent teeth
Exclusion criteria
hypodontia, missing teeth
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| severity of relapse (unexpected tooth movement in mandibular frontal area) at 1 year | 1 year | the unabbreviated scale title: Little Irregularity Index (used to measure the crowding)- numerical rating scale in millimeters the minimum and maximum values: 0,10 higher scores mean a worse outcome lower scores mean a better outcome |
| extent of biofilm accumulation at 3 years | 3 years | the unabbreviated scale title: Silness and Loe Plaque Index-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better result |
| extent of biofilm accumulation at 2 years | 2 years | the unabbreviated scale title: Silness and Loe Plaque Index-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better result |
| incidence of retainer failure (debonding, breakage) at 3 years | 3 years | percentage of cases with at least one fixed retainer failure, the minimum and maximum values 0%,100% higher scores mean a worse outcome, lower scores mean a better result |
| incidence of retainer failure (debonding, breakage) at 2 years | 2 years | percentage of cases with at least one fixed retainer failure, the minimum and maximum values 0%,100% higher scores mean a worse outcome, lower scores mean a better result |
| severity of relapse (unexpected tooth movement in mandibular frontal area) at 3 years | 3 years | the unabbreviated scale title: Little Irregularity Index (used to measure the crowding)- numerical rating scale in millimeters the minimum and maximum values: 0,10 higher scores mean a worse outcome lower scores mean a better outcome |
| severity of relapse (unexpected tooth movement in mandibular frontal area) at 2 years | 2 years | the unabbreviated scale title: Little Irregularity Index (used to measure the crowding)- numerical rating scale in millimeters the minimum and maximum values: 0,10 higher scores mean a worse outcome lower scores mean a better outcome |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| changes of intercanine width | 2 years, 3 years | the unabbreviated scale title: intercanine width change in millimeters, the minimum and maximum values 0,5, higher scores mean a worse outcome, lower result mean a better outcome |
| incidence of intercanine width change | 3 years | percentage of cases with intercanine width change, the minimum and maximum values 0%,100% higher scores mean a worse outcome, lower scores mean a better result |
| extent of calculus accumulation at 2 years | 2 years | the unabbreviated scale title: Calculus Surface Index (CSI)-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better outcome |
| extent of calculus accumulation at 3 years | 3 years | the unabbreviated scale title: Calculus Surface Index (CSI)-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better outcome |
Other
| Measure | Time frame | Description |
|---|---|---|
| incidence of relapse at 3 years | 3 years | the unabbreviated scale title: percentage of relapsed cases; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better outcome |
| loss of productivity | 3 years | the unabbreviated scale title: number of check-ups in retention period; the minimum and maximum values 0,10; higher scores mean a worse outcome, lower scores mean a better result the minimum and maximum values: 0,30 |
| costs total | 3 years | calculation of costs of retention: failures and new retainers in euros |
| satisfaction with stability of results in retention period | 3 years | Participant's satisfaction with stability of results as assessed using a 5-point Likert scale. Scores range from very unsatisfied (1) to very satisfied (5). Higher scores mean a better outcome, lower scores mean a worse outcome |
| duration of orthodontic treatment in months | 1 year | the unabbreviated scale title: numerical rating scale the minimum and maximum values: 0,30 |
| extent of gingivitis at 3 years | 3 years | the unabbreviated scale title: Bleeding on probing (BOP)-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better result |
| incidence of relapse at 2 years | 2 years | the unabbreviated scale title: percentage of relapsed cases; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better outcome |
| extent of gingivitis at 2 years | 2 years | the unabbreviated scale title: Bleeding on probing (BOP)-ratio of measuring sites in mandibular central sextant; the minimum and maximum values 0%,100%, higher scores mean a worse outcome, lower scores mean a better result |
Countries
Croatia
Contacts
Primary ContactSilvija Kanižaj Ugrin, DDM
Backup ContactStjepan Špalj, PhD
Outcome results
None listed