Comparative evaluation of functional and patient-reported (subjective) parameters before and after combined orthodontic and orthognathic treatment.

Status

Recruiting

Phases

Unknown

Study type

Observational

Source

DRKS

Registry ID

DRKS00039732

Enrollment

Registered

2026-03-25

Start date

2024-11-01

Completion date

Unknown

Last updated

2026-03-30

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Dysgnathie (skelettale Fehlstellungen der Kiefer, z. B. Angle-Klasse II und III)

Interventions

Group 1: This is a non-interventional prospective observational study. The study includes patients undergoing orthognathic surgery as part of routine clinical care. No additional intervention is perf

Eligibility

Sex/Gender

All

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: - Sufficient proficiency in German to independently complete a questionnaire - Planned orthognathic surgery (monomaxillary or bimaxillary osteotomy) as part of a combined orthodontic-surgical treatment - or planned orthognathic surgery (monomaxillary or bimaxillary osteotomy) in the context of obstructive sleep apnea syndrome (OSAS)

Exclusion criteria

Exclusion criteria: - Minor patients (under 18 years of age) - Patients who are unable to independently complete a questionnaire due to insufficient German language proficiency - Lack of informed consent - Surgery not performed - Incomplete or non-evaluable datasets/questionnaires

Design outcomes

Primary

Measure	Time frame
The primary outcome is the change in health-related quality of life measured by the Orthognathic Quality of Life Questionnaire (OQLQ) comparing preoperative and postoperative assessments. Data are collected at two time points: preoperatively before surgery and postoperatively during routine follow-up. Data collection is performed using a standardized questionnaire (OQLQ).	—

Secondary

Measure	Time frame
Secondary outcomes include changes in mandibular mobility, specifically protrusion, laterotrusion (left and right), and mouth opening, comparing preoperative and postoperative measurements. Additionally, correlations between the extent of surgical displacement, changes in mandibular mobility, and changes in quality of life are analyzed. Measurements are performed preoperatively and postoperatively as part of routine clinical assessments.	—

Measure

Time frame

Secondary outcomes include changes in mandibular mobility, specifically protrusion, laterotrusion (left and right), and mouth opening, comparing preoperative and postoperative measurements. Additionally, correlations between the extent of surgical displacement, changes in mandibular mobility, and changes in quality of life are analyzed. Measurements are performed preoperatively and postoperatively as part of routine clinical assessments.

—

Countries

Germany

Contacts

Public ContactJohannes Spille

Universitätsklinikum Schleswig-Holstein, Campus Kiel

johannesheinrich.spille@uksh.de0431/ 500 26000

Outcome results

None listed

Source: DRKS (via WHO ICTRP) · Data processed: Apr 4, 2026