Condition category
Musculoskeletal Diseases
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Dr G J Buijs


Contact details

University Medical Center Groningen (UMCG)
Department of Oral Surgery
P.O. Box 30001
9700 RB
+31 (0)50 361 0452

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Efficacy and safety aspects of biodegradable fixation systems: a randomised clinical trial



Study hypothesis

The performance of the Inion biodegradable osteofixation system is inferior compared to a titanium system regarding the treatment of zygoma, Le Fort I fractures, Le Fort I osteotomies, mandibula fractures and Bi-lateral Sagittal Split Osteotomies (BSSO) of the maxillofacial skeleton by healthy patients with regard to bone healing, stability and complications like, infections, plate dehiscence, hypersensitivity and palpability.

Ethics approval

Medisch Ethische Toetsingscommissie Universitair Medisch Centrum Groningen, 01/05/2006, ref: 2006/035

Study design

Randomised controlled parallel-group double-blinded multicentre trial

Primary study design


Secondary study design

Randomised parallel trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details to request a patient information sheet


Maxillofacial trauma and orthognathic anomalies in the maxillofacial skeleton


Fixing bone segments in the maxillofacial skeleton with titanium or biodegradable fixation devices.

Intervention type



Drug names

Primary outcome measure

Bone healing is the primary outcome measure. The definition of bone healing is: healing of the bone segments after eight weeks without clinical and radiological signs of disturbed bone healing.

Bone healing related complications are not allowed during this period.

Secondary outcome measures

1. Inflammatory reaction present (redness, swelling, sensitivity, warmth, function impairment, fistula or pus drainage), assessment visual and manually
2. Seriousness inflammatory reaction (mild, serious), assessment visual and manually
3. Palpability, assessment manually
4. Dehiscence, assessment visual
5. Occlusion, assessment visual
6. Bone formation (screw holes, fracture crevice)
7. Pain, evaluated by a Visual Analogue Scale (VAS)
8. Cold/warm sensitivity
9. Mandibular function, evaluated by a Mandibular Function Impairment Questionnaire (MFIQ)
10. Direct costs within the health care
11. Direct costs outside the health care
12. Indirect costs outside the health care
13. Antibiotic use
14. Analgesic use
15. Re-operation required
16. Reasons re-operations (plate/screw exposition, plat/screw fracture, loosening of plates and screws, inadequate bone healing, inadequate reduction, infection or other reasons)

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Patients scheduled for a solitair Le Fort I fractures, and/or
2. Patients scheduled for a solitair of multiple mandibula fracture(s), and/or
3. Patients scheduled for a solitair zygoma fracture, and/or
4. Patients scheduled for a Le Fort I osteotomy, and/or
5. Patients scheduled for a BSSO
6. Patients who signed the informed consent form

Participant type


Age group

Not Specified


Not Specified

Target number of participants


Participant exclusion criteria

1. Severe chronically ill patients (i.e.. diabetes mellitus)
2. Patients by whom compromised bone healing has been established (i.e. osteoporosis)
3. Patients who are submerged through an infection
4. Patients who are pregnant
5. Patients who could not participate in a long follow-up (reasons)
6. Patients who already have received maxillary surgery in the past (i.e,. schisis)
7. Patients who are diagnosed with a psychiatric disorder (diagnosed by a psychiatrist)
8. Patients who will not agree with a random assignment to one of the treatment groups or one of the methods of treatment used in the study
9. Patients younger than 18 years regarding patients treated for fractures and patients younger that 14 regarding patients treated for osteotomies

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

University Medical Center Groningen (UMCG)
9700 RB

Sponsor information


University Medical Center Groningen (UMCG) (The Netherlands)

Sponsor details

Department of Oral and Maxillofacial Surgery
Hanzeplein 1
9713 GZ

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Stryker Nederland (The Netherlands)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

2012 results in:
2013 results in:
2015 results in:
2017 results in:

Publication citations

  1. Results

    Buijs GJ, van Bakelen NB, Jansma J, de Visscher JG, Hoppenreijs TJ, Bergsma JE, Stegenga B, Bos RR, A randomized clinical trial of biodegradable and titanium fixation systems in maxillofacial surgery., J. Dent. Res., 2012, 91, 3, 299-304, doi: 10.1177/0022034511434353.

  2. Results

    van Bakelen NB, Buijs GJ, Jansma J, de Visscher JG, Hoppenreijs TJ, Bergsma JE, Stegenga B, Bos RR, Comparison of biodegradable and titanium fixation systems in maxillofacial surgery: a two-year multi-center randomized controlled trial., J. Dent. Res., 2013, 92, 12, 1100-1105, doi: 10.1177/0022034513508953.

  3. Results

    van Bakelen NB, Vermeulen KM, Buijs GJ, Jansma J, de Visscher JG, Hoppenreijs TJ, Bergsma JE, Stegenga B, Bos RR, Cost-Effectiveness of a Biodegradable Compared to a Titanium Fixation System in Maxillofacial Surgery: A Multicenter Randomized Controlled Trial, PLoS One, 2015 , 10, 7, e0130330, doi: 10.1371/journal.pone.0130330.

Additional files

Editorial Notes

12/05/2017: Publication reference added.