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Malocclusion, Angle Class IIPONCOSNCT03455634

Predictors Associated With Seeking Orthodontic Treatment, Compliance and Treatment Success

A study testing Twin Block and Sander bite jumping appliance in people with Malocclusion, Angle Class II, run by Visnja Katic at 1 site in Croatia.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Aim: to search for reasons for seeking orthodontic treatment, compliance during orthodontic treatment, drop-out from orthodontic treatment and success of orthodontic treatment. Methods: evaluation before, during and at the end of orthodontic treatment. Read more about this study

Who is it for?
Ages 10 to 14 years
Conditions the study is for
Malocclusion, Angle Class II
What is being tested?
Twin Block and Sander bite jumping appliance
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
110 participants
Where
1 siteCroatia
Study dates
9 Feb 2015to 17 May 2022
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 10 to 14 years
  • All sexes
  • No healthy volunteers
  • Child

Who may be able to join

  • distal molar occlusion, overjet >5 mm, cervical vertebral maturation method stages (CS) -CS2, CS3 or CS4

Who cannot join

  • mental retardation

Trial locations and contacts

1 site in 1 country.

Croatia1 site
  • University of Rijeka, Faculty of Dental Medicine

    Rijeka, Primorsko-goranska County, HR-51000

Other trials in Croatia

About this study

Official title: Treatment of Malocclusion Class II/1 - Predictors for Seeking, Compliance and Outcome

Aim: to search for reasons for seeking orthodontic treatment, compliance during orthodontic treatment, drop-out from orthodontic treatment and success of orthodontic treatment.

Methods: evaluation before, during and at the end of orthodontic treatment. Clinical and diagnostic evaluation of complexity before and at the end of orthodontic treatment, evaluation of awareness of treatment need, impact on social and psychological aspects, functional disturbances, impact of malocclusion on quality of life, social interaction, ability to perform daily activities.

Read the detailed description

Data will include diagnostic measurements on study casts, x-rays, and data from questionnaires given to children and parents. Statistical analyses will explore predictors of treatment success with treatment need, compliance and psycho-social domains.

Being tested
Twin Block, Sander bite jumping appliance
Keywords
quality of life
Medical subject headings
Malocclusion, Angle Class II

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Twin BlockDevice

    functional appliances for the stimulation of the mandibular growth

  • Sander bite jumping applianceDevice

    functional appliances for the stimulation of the mandibular growth

Study groups in NCT03455634
Study groupRoleWhat they receive
Twin BlockActive comparatorTwin Block functional appliance
Receives: Device: Twin Block
SanderActive comparatorSander bite jumping appliance
Receives: Device: Sander bite jumping appliance
ControlNo interventionno intervention

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Overjet

    sagittal distance between upper and lower anterior teeth measured in mm

    Measured: baseline

  2. Child perception questionnaire age 11-14 (CPQ 11-14 SF16) , subscale measuring oral symptoms

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of oral symptoms on quality of life

    Measured: baseline

  3. subscale functional limitations of CPQ 11-14 SF16

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of functional limitations on quality of life

    Measured: baseline

  4. subscale emotional well-being of CPQ 11-14 SF16

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of emotional wee-being on quality of life

    Measured: baseline

  5. subscale social well-being of CPQ 11-14 SF 16

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of social well-being on quality of life

    Measured: baseline

  6. Self-perceived satisfaction with dental appearance

    rating scale, answer on 5-point Likert scale (0-4), higher score means greater satisfaction with dental apperance

    Measured: baseline

  7. Self-perceived treatment need

    rating scale, answers on 5-point Likert scale (0-4), higher score means greater self-perceived treatment need

    Measured: baseline

  8. overall score of CPQ 11-14 SF 16 and SF8

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-32 for SF8 and 0-64 for SF16 (sum of all items in short-form 8 and 16 instruments), higher score means higher impact of oral disorders on quality of life

    Measured: baseline

  9. change in overjet

    sagittal distance between upper and lower anterior teeth measured in mm

    Measured: change from baseline to one year of appliance wear

Secondary outcomes (18)
  1. Parental-Caregiver Perceptions Questionnaire (P CPQ), subscale oral symptoms

    P CPQ, answers on 5-point Likert scale (0-4), score range 0-24, higher score means greater impact of children's oral health status on oral symptoms, as perceived by parents / caregivers

    Measured: baseline

  2. P CPQ, subscale functional limitations

    P CPQ, answers on 5-point Likert scale (0-4), score range 0-28, higher score means greater impact of children's oral health status on functional limitations, as perceived by parents / caregivers

    Measured: baseline

  3. P CPQ, subscale emotional well-being

    P CPQ, answers on 5-point Likert scale (0-4), score range 0-32, higher score means greater impact of children's oral health status on emotional well-being, as perceived by parents / caregivers

    Measured: baseline

  4. P CPQ, subscale social well-being

    P CPQ, answers on 5-point Likert scale (0-4), score range 0-40, higher score means greater impact of children's oral health status on social well-being, as perceived by parents / caregivers

    Measured: baseline

  5. overall score of P CPQ

    P CPQ, answers on 5-point Likert scale (0-4), score range 0-124 (sum of subscales), higher score means greater impact of children's oral health status on quality of life, as perceived by parents / caregivers

    Measured: baseline

  6. parental/family activity subscale of Family Impact Scale (FIS) questionnaire

    FIS questionnaire, answers on 5-point Likert scale (0-4), score range 0-20, higher score means greater impact of children's oral health status on parental/family activity, as perceived by parents / caregivers

    Measured: baseline

  7. parental emotions subscale of FIS

    FIS, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of children's oral health status on parental emotions, as perceived by parents / caregivers

    Measured: baseline

  8. family conflict subscale of FIS

    FIS, answers on 5-point Likert scale (0-4), score range 0-16, higher score means greater impact of children's oral health status on family conflict, as perceived by parents / caregivers

    Measured: baseline

  9. financial burden subscale of FIS

    FIS, answers on 5-point Likert scale (0-4), score range 0-4, higher score means greater impact of children's oral health status on financial burden, as perceived by parents / caregivers

    Measured: baseline

  10. overall score of FIS

    FIS, answers on 5-point Likert scale (0-4), score range 0-56 (sum of subscales), higher score means greater impact of children's oral health status on family, as perceived by parents / caregivers

    Measured: baseline

  11. change in oral symptoms of CPQ 11-14 SF16

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, change in sum score from baseline to one year of appliance, higher score means greater impact of change of oral symptoms on quality of life

    Measured: change from baseline to one year of appliance wear

  12. change in functional limitations of CPQ

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, change in sum score from baseline to one year of appliance, higher score means greater impact of change in functional limitations on quality of life

    Measured: change from baseline to one year of appliance wear

  13. change in emotional well-being of CPQ

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, change in sum score from baseline to one year of appliance, higher score means greater impact of change in emotional well-being on quality of life

    Measured: change from baseline to one year of appliance wear

  14. change in social well-being of CPQ

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-16, change in sum score from baseline to one year of appliance, higher score means greater impact of change in social well-being on quality of life

    Measured: change from baseline to one year of appliance wear

  15. change in overall score of CPQ SF8

    CPQ 11-14, answers on 5-point Likert scale (0-4), score range 0-32, change in sum score from baseline to one year of appliance, higher score means greater impact of change in oral disorders on quality of life

    Measured: change from baseline to one year of appliance wear

  16. validation of CPQ 11-14 in Croatia

    16 items and 8 items short form questionnaires, answers on 5-point Likert scale (0-4), score range 0-64, higher score means greater impairment of quality of life

    Measured: one year

  17. validation of P CPQ in Croatia

    31 items, answers on 5-point Likert scale (0-4), score range 0-124, higher score means greater impairment of childrens' quality of life perceived by their parents

    Measured: one year

  18. validation of FIS in Croatia

    14 items, answers on 5-point Likert scale (0-4), score range 0-56, higher score means greater impairment of children's' quality of life perceived by their parents

    Measured: one year

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted6 Mar 2018
  2. Study start9 Feb 2015
  3. Primary completion1 Apr 2022
  4. Study completion17 May 2022

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
110 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03455634
Sponsor's protocol ID
2170-24-01-15-2
Other IDs
2170-29-02/1-14-5, 13.06.2.1.53, uniri-biomed-18-22, IP9
Acronym
PONCOS
Status last verified
May 2022
First submitted
21 Feb 2018
Last updated
26 May 2022
Results posted
No
Individual data sharing
Undecided

Publications

  • Brumini M, Slaj M, Katic V, Pavlic A, Trinajstic Zrinski M, Spalj S. Parental influence is the most important predictor of child's orthodontic treatment demand in a preadolescent age. Odontology. 2020 Jan;108(1):109-116. doi: 10.1007/s10266-019-00447-1. Epub 2019 Aug 23.

    PubMed 31444594
  • Acev DP, Brumini M, Slaj M, Katic V, Spalj S. Child Perceptions Questionnaire in Croatia: Two Domains for Measuring Oral Health. Acta Stomatol Croat. 2019 Mar;53(1):47-54. doi: 10.15644/asc53/1/5.

    PubMed 31118532
  • Uhac M, Zibar Belasic T, Perkovic V, Zigante M, Spalj S. Validation of the Parental-Caregivers Perception Questionnaire (P-CPQ) in Croatia. Abstract book 6th Congress of School of Dental Medicine, University of Zagreb. Acta Stomatol Croat. 2020;54:210:212.

  • Brumini M, Uhac M, Zibar Belasic T, Spalj S. Parental attitude and emotional well-being mediate orthodontic treatment demand in adolescents. Abstract book 6th Congress of School of Dental Medicine, University of Zagreb. Acta Stomatol Croat. 2020;54:210:212-3.

  • Brumini M. Predictors of orthodontic treatment demand in early adolescence (dissertation). Rijeka; University of Rijeka, Faculty of Medicine: 2020.

  • Uhac M, Zibar Belasic T, Perkovic V, Matijevic M, Spalj S. Orthodontic treatment demand in young adolescents - Are parents familiar with their children's desires and reasons? Int J Paediatr Dent. 2022 May;32(3):383-391. doi: 10.1111/ipd.12893. Epub 2021 Nov 28.

    PubMed 34402117
  • Uhač M, Zibar Belašić T, Perković V, Matijević M, Špalj S. Orthodontic treatment demand in young adolescents - comparison of parents and their children. 7. Međunarodni kongres Stomatološkog fakulteta Sveučilišta u Zagrebu. Acta Stomatologica Croatica. Rovinj, Hrvatska, 21.-22.05.2021.

  • Spalj S, Uhac M, Brumini M. Role of parents in patient compliance during class II division 1 malocclusion. 51st SIDO International Congress on-line. 13-14.11.2020.

  • Marijanović M, Uhač M, Žigante M, Špalj S. Validation of the Family Impact Scale (FIS) in Croatia. 1. Kongres Fakulteta dentalne medicine u Rijeci. 1. i 2. listopada 2020.

  • Brumini M, Špalj S. Child Perceptions Questionnaire - validation protocol. 8th Virtual world congress of dental students. Zagreb, 20.-22.05.2020.

  • Uhač M, Žigante M, Špalj S. Early Childhood Oral Health Impact Scale and orthodontics: cross-cultural adaptation in Croatia. 51st SIDO International Congress on-line. 13-14.11.2020.

  • Cukaj Ademi H, Zigante M, Premaraj Thyagaseely S, Tudor V, Palomo JM, Spalj S. Mandibular Advancement in Dentofacial Orthopaedics: Effects on Pharyngeal Airway, Dentoskeletal Characteristics and Quality of Life: A Randomised Controlled Trial. Orthod Craniofac Res. 2026 Feb;29(1):122-133. doi: 10.1111/ocr.70056. Epub 2025 Nov 10.

    PubMed 41211711

Questions about this trial

What is this clinical trial studying?

A study testing Twin Block and Sander bite jumping appliance in people with Malocclusion, Angle Class II, run by Visnja Katic at 1 site in Croatia.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 26 May 2022. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Croatia. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Overjet (time frame: baseline). The study lists 9 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT03455634, which also lists 12 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 26 May 2022.

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