How soft tissue augmentation after tooth extraction improves implant health: findings from a clinical trial
| ISRCTN | ISRCTN18692174 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN18692174 |
| ClinicalTrials.gov (NCT) | Nil known |
| Clinical Trials Information System (CTIS) | Nil known |
| Protocol serial number | 0000 |
| Sponsor | Damascus University |
| Funder | Damascus University |
- Submission date
- 14/07/2024
- Registration date
- 15/07/2024
- Last edited
- 05/08/2025
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Oral Health
Plain English summary of protocol
Background and study aims
This study aims to compare the outcomes of dental implants placed at sites augmented with a novel cross-linked collagen matrix (Fibro-Gide®), traditional connective tissue grafts, or spontaneous healing following tooth extraction.
Who can participate?
Adults aged 18 years or older who have had a posterior mandibular (back tooth in jaw) extraction
What does the study involve?
Participants will be allocated to receive soft tissue augmentation with a xenogenic collagen matrix (XCM), connective tissue graft (CTG), or no biomaterial placed within the socket after tooth extraction. At 6 months after surgery, the participants will receive a dental implant.
What are the possible benefits and risks of participating?
This study will determine the effectiveness of using XCM and CTG in soft tissue augmentation before implant placement on the health of peri-implant tissues, compared to not applying any material within the socket. There is a risk of not achieving optimal results in some cases but the study team can manage these cases with alternative methods.
Where is the study run from?
Damascus University (Syria)
When is the study starting and how long is it expected to run for?
June 2023 to April 2024
Who is funding the study?
Damascus University (Syria)
Who is the main contact?
Dr Ammar Ibrahim AmmarIbrahimISRCTN@gmail.com
Contact information
Public, Scientific, Principal investigator
Damascus
Damascus
00000
Syria
 ORCID ID |
0009-0003-0433-9108 |
|---|---|
| Phone | +963 (0)992964458 |
| AmmarIbrahimISRCTN@gmail.com |
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Comparative interventional randomized controlled study |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | Impact of soft tissue augmentation on peri-implant health post-extraction: a randomized controlled trial |
| Study objectives | Does the use of xenogenic collagen matrix or connective tissue graft, compared to spontaneous healing, affect the health of peri-implant tissues? |
| Ethics approval(s) |
Approved 17/07/2023, Damascus University Ethics Committee (Damascus, Damascus, 0000, Syria; +963 (0)113341864; manager@hcsr.gov.sy), ref: 22486 |
| Health condition(s) or problem(s) studied | Pre-implant placement soft tissue augmentation |
| Intervention | The method used for randomization was a closed envelope method. The envelopes were opened prior to the soft tissue augmentation procedure, allocating the patient into one of the three groups. Following extraction, the subjects underwent one of three randomly assigned treatments: soft tissue augmentation with connective tissue graft (CTG), xenogenic collagen matrix (XCM), or spontaneous healing (SH) without soft tissue augmentation. Six months subsequent to these interventions, dental implants were placed. |
| Intervention type | Procedure/Surgery |
| Primary outcome measure(s) |
1. Pocket depth (PD) assessed using a periodontal probe gauged from the edge of the mucosa to the base of the pocket at two timepoints (baseline and 6 months after functional loading) at six distinct points around each implant, mesio-buccal (mb), buccal (b), disto-buccal (db), mesio-oral (mo), oral (o), and disto-oral (do), to ensure a thorough evaluation. |
| Key secondary outcome measure(s) |
1. Plaque Accumulation Index (PAI): adapted from the methodology proposed by Löe and colleagues (LÖE et al., 1972). this index was evaluated using a periodontal probe at six points around each implant: mesio-buccal (mb), buccal (b), disto-buccal (db), mesio-oral (mo), oral (o), and disto-oral (do), to ensure a thorough evaluation at baseline and 6 months after functional loading. |
| Completion date | 23/04/2024 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Upper age limit | 45 Years |
| Sex | All |
| Target sample size at registration | 30 |
| Total final enrolment | 30 |
| Key inclusion criteria | 1. Had extraction sites that conformed to Type ST1 classification, as per Steigmann et al. (Steigmann et al., 2022), where both facial soft and hard tissues were preserved at levels consistent with the cementoenamel junction 2. Possessed at least 2 mm of keratinized tissue on the buccal aspect of the extraction site 3. Demonstrated commendable oral hygiene 4. Aged 18 years or above |
| Key exclusion criteria | 1. Exhibited buccal alveolar bone defects, such as dehiscence or fenestration, or experienced loss of the facial bone plate during extraction 2. Had systemic conditions that could impede bone healing 3. Were pregnant at the time of the study 4. Were classified as heavy smokers, defined as those consuming over 10 cigarettes daily |
| Date of first enrolment | 23/08/2023 |
| Date of final enrolment | 23/03/2024 |
Locations
Countries of recruitment
- Syria
Study participating centre
Damascus
00000
Syria
Results and Publications
| Individual participant data (IPD) Intention to share | Yes |
|---|---|
| IPD sharing plan summary | Available on request |
| IPD sharing plan | The datasets generated during and/or analysed during the current study will be available on request from Dr Ammar Ibrahim (AmmarIbrahimISRCTN@gmail.com) and in the publication related to it after the end of the research. Type of data that will be shared: demographic information (age, gender), location of the tooth to be extracted, clinical and radiographical measurements, photos of clinical procedure. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | 06/08/2024 | 05/08/2025 | Yes | No | |
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
Editorial Notes
05/08/2025: Publication reference added.
15/07/2024: Study's existence confirmed by Damascus University.
